bluuebunny/crossref_metadata_2025 huggingface dataset:
Numerical Analysis of Foundation Soil Displacement to Adjacent Buildings Caused by Running Subway
Authors: Ding Zhi , Ge Guo Bao , Wei Xin Jiang , Zhang Tao
Published: February 2012

The tunnel - subgrade - adjacent buildings interaction model was established by ANSYS to simulate the soil displacement by Running Subway to adjacent buildings. According to D'Alembert principle, we got the dynamic load produced by train acceleration. Multi-point load was applied to simulate the movement of train. Based on ANSYS simulation results, the surrounding soil displacement of the tunnel was analyzed when in different train speed. On the other hand, the soil displacement in different depths is analyzed when in the same train speed.
Study on Reliability of Submerged Floating Tunnel with Single Span under Vortex-Induced Vibration
Authors: Zhou Xiao Jun , Wang Jing He , Luo Gang
Published: February 2012

The probability distribution of buoyancy amplitude of vortex-induced vibration for a submerged floating tunnel with single span under steady flow is studied by means of Monte-Calor method in this paper. The probability response of bending moment and displacement in the central span of submersed floating tunnel, including shear response at its buttress are also analyzed. Meanwhile, the reliability of a submerged floating tunnel with single span is also calculated in terms of the structural limit state equation under vortex-induced vibration.
A Study on the Influence by Karst on the Stability of Surrounding Rock in Neighborhood Tunnel
Authors: Wang Cheng , Pi Xiao Qiang
Published: February 2012

Based on the Shuangbei tunnel, this paper studied influences on the deformation and stress of surrounding rock, regarding different Karst sizes and locations in such a neighborhood tunnel. The study indicates that variations of size and distance of the karst have prominent influence on the vertical displacements of vault and right side-wall in the tunnel near the karst, but have no influence on the horizontal displacement; while variation of karst size has prominent influence not only on the horizontal displacement, but also on the vertical displacement at the bottom of the tunnel far away from the karst; variations of size and distance of the karst have the prominent influence on the vault stress of the two tunnels. The results offer the reference to the tunnel construction and the selection of support type.
Study on Failure of Soft Overburden of Fully Mechanized Top Coal Caving
Authors: Wang Jin Shan , Wang Zhong Chang
Published: February 2012

The similar material model experiment takes the NO.S2S9 coal face in DaPing coal mine as a prototype to research the characteristics of movement and failure of the soft overburden under fully mechanized top coal caving conditions. The abutment pressure distribution and periodic weighting, caving span are given by monitoring the stress and strain in the similar material model. The results show that rocks fracture extended from button with the advance of workface. The first caving step distance of main roof is 34m. The periodic caving step distance of main roof is 10m. The internal stress field is 10m and the peak abutment pressure point is 80m far away from the coal wall, while the disturbance range in anterior coal wall is 200m. Some cracks are closed in the later stage. The advance of around 300m is the distance that the water flowing fractured zone’s height reaches the highest value. The biggest height of water- flowing fractured zone is 140m. The soft overburden has strong plastic deformation capability. The synchronism of failure and movement of overburden is strong. The failured overburden is compacted and the cracks keep close with the advance of workface. The simulation experiment provides a reference bases for the application and promotion of thick seam mining technology.
Technology of Joint Support on Large Pump House in HS Soft Rock
Authors: Wen Xing Lin , Gao Lin Hai , Li Xiu Shan , Liu Zhao Ping
Published: February 2012

Soft rock; Anchor bolt-net-spray support; Twice support; Large section; Numerical simulation
Analysis on the Characteristics of Displacement Field Distribution around the Deep Buried and Great Complex Section Tunnel
Authors: Lei Sheng Xiang , Gao Bo , Xiao Qing Hua
Published: February 2012

Taken the excavation of TBM assembly underground chamber with deeply buried super large and complex section in Jinping Ⅱ Hydropower Station as the background, apply theoretical analysis and experimental method to study the rock deformation and displacement analysis. The result shows that, drilling and blasting method is used for construction which is divided into four layers from top to bottom according to the excavation, they are 8.5m, 5.5m, 6.0m,7.0m from top to bottom, respectively. the displacement of surrounding rock generally moves toward the direction of the free surface. The rock possesses spring back deformation pointing to internal underground chamber. The displacements of arch crown and floor are mainly vertical, and displacement of retaining wall is mainly horizontal. This is significantly different from the rock deformation of underground chamber under general stress after excavation. The chamber displacement distribution under high crustal stress is closely related to stress direction. Location axis of underground chamber should parallel the direction of maximum principal stress. Under the complex and great deeply buried condition, excavation of large section tunnel by digging from the top layer can better release the rock stress, and the rock displacement changes gently, which is conducive to rock mass stability and structure security.
The Analysis of Government Re-Regulation Caused by Externality of Building Energy-Saving
Authors: Wang Ting , Li Qian , Ma Hong Liang
Published: February 2012

In this paper, aiming at the problem of “market failure” in the building energy-saving field, we discuss the principle of externality in this field and analyze how the externality of building energy-saving leads to the rent-seeking behavior of building energy-saving products manufacturers or developers using the economic theory. Based on the Game theory, we analyze the revenue and cost of unproductive activities between building energy-saving regulation department and building energy-saving products manufacturers or developers, how the government supervises and regulates corruption which comes from unproductive activities, and the tripartite game model of the rent-seeking behavior in the domain of energy-saving is built. On the basis of the establishment and solution of the tripartite game model，we put forward effective countermeasures and methods for government re-regulation.
Comparative Analysis of the Influence of Slope Terrain on Characteristics of Horizontal and Vertical Ground Motion Response Spectrum
Authors: Wang Li Ping , Zhao Yao
Published: February 2012

All previous earthquake damage show earthquake damage of the buildings on the slope is serious than the buildings on flat ground, so it is important to analyze of the influence of slope terrain on characteristics of horizontal and vertical ground motion response spectrum. The horizontal and vertical seismic elastic responses of 28 viscoelastic rocky slopes by white noises excited, with height of 10m to70m and slope of 15°to 60°, are calculated by numerical finite element analysis method. The influence laws of height and degree of slope on horizontal and vertical ground motion response spectrum and response spectral ratio are analyzed. The distribution laws of the corresponding period of the maximum of response spectral ratios are contrasted. The maximum of amplification factor of design horizontal and vertical ground motion for structures on rock slopes are given to be the references to code for seismic design of building structures.
Investigation of Steel Plate Damper with Transverse Slits
Authors: Li Zong Jing , Huang Zhen , Wang Cheng Zhi , Wang Jian
Published: February 2012

This article introduces a new type of steel plate damper with transverse slits. The damper mainly consists of a few parallel core plates, a top plate and a bottom plate. The core plates are made of mild steel with a series of transverse slits in the centre. The damper mainly utilizes plastic bending deformation of the core plates to dissipate energy for vibration control of civil structures. Main performance parameters of the damper are studied through theoretical analysis. Mechanical properties of the damper are analyzed through finite element method (FEM). Finally, an experiment of the damper is conducted to verify the hysteresis performance of the damper. Results of the investigation indicate a better use of the core plates due to the transverse slits. The damper exhibits good energy dissipation capacity and ductility through the experiment.
Feasibility of SPT to Evaluating Bachu-Jiashi Earthquake Liquefaction
Authors: Li Zhao Yan , Yuan Xiao Ming
Published: February 2012

Take February 24, 2003 the Xinjiang Bachu-Jiashi area liquefication investigation as a foundation, using the SPT count as an indicator of liquefaction decision, liquefied decision methods of sites are considered at domestic and abroad, in which Chinese code liquefied prediction method and Seed-Idriss method are included. The result indicated that our country code and the Seed-Idriss method in liquefied the location prediction success ratios are only 43% and 48%, is in favor of the danger obviously. The reason possibly is the formation of SPT data mainly from the local area, but the Bachu-Jiashi area soil is quite different, therefore is worth the deep research.
Experimental Study on Seismic Behavior of High-Rise RC Shear Wall with Diagonal Web Reinforcement
Authors: Zhou Guang Qiang , Liu Qing Yang , Zhou De Yuan
Published: February 2012

Based on the experiment of four models of reduced scale high-rise reinforced concrete wall under low-reversed cyclic loading, seismic behavior of reinforced concrete (RC) shear wall with diagonal web reinforcement under different ratio of axial compression is studied, in comparison to ordinary shear wall. The experiment result shows that diagonal bars affect the distribution of cracks and help to resist shear slip at the bottom of the wall. Seismic behavior of high-rise shear wall, which horizontal bars are replaced with the same amount diagonal bars in part can be obviously improved when the ratio of axial compression is high, but when the ratio of axial compression is low, the effect is not obvious.
Dynamic Stress Concentration of Underground Lined Cavities in Different Distance under Incident Plane SV Wave
Authors: Huang Min , Pan Bing Yu
Published: February 2012

A series solution for dynamic stress concentration of underground lined cavities in different distance under incident plane SV waves is given by wave function expansion method. The infinite series is cut and calculated under the required precision. The lining includes rigid lining, unlined cavities, flexible lining. The numerical results show that the distance between cavities has an important impact on the dynamic stress concentration factor and the interaction between two cavities greatly amplifies the dynamic stress concentration. With the distance increases the dynamic stress concentration factor turn smaller gradually and tend to the distribution case of one cavity; The rigidity of lining also has great effect on the dynamic stress concentration which is highest for the rigid lining, second for unlined cavities and is lowest for the flexible lining.
Experimental Study on the Seismic Performance of Macro-Synthetic Fiber- Reinforced Concrete Ductile Columns
Authors: Ma Hua , Wang Hong Huan , Li Zhen Bao , Sun Xin Yu , Zhang Xue Wei
Published: February 2012

In order to study the seismic performance, of macro-synthetic fiber-reinforced concrete ductile columns, specific used as the concrete energy absorption system placed in the structure, three concrete ductile columns were constructed and tested using low-frequency cyclic loading. The damage pattern, hysteresis curve, ductile factor and equivalent viscous damping coefficient of the columns were obtained. The results show that the macro-synthetic fiber-reinforced concrete ductile column has the good ductility and the high post-crack energy absorption ability.
Safety Control of Blasting Construction in New Austrian Metro Tunnel
Authors: Wang Hong De , Shen Xiu Feng
Published: February 2012

Abstract. Through the analysis and research on the vibration effect caused by the urban New Austrian (shallow embedded) metro tunnel blasting construction, the main harming effect of the blasting vibration on the surface buildings is summarized. According to the actual condition on the site of blasting construction in No.2 line of Dalian metro tunnel, the reasonable vibration monitoring plan for blasting vibration wave is established. At the same time, by means of the regression analysis about the monitoring results of blasting vibration, the vibration wave’s regression formula are set up, which can expression the correlation among the vibration velocity, the charge weight, the distance between the blasting fountains and the buildings. The results show that the Sadaovsk formula can be use to describe the effect of the metro tunnel blasting construction on the surface buildings accurately and reasonably in this construction segment. This kind of regression analysis method can be use to direct subsequent blasting excavation.
Damage Condition Assessment of Expressway Asphalt Pavement Based on RBF Neural Network
Authors: Huang Ya Xin , Shao Fei , Liu Ya Wen
Published: February 2012

In order to make the performance evaluation of highway asphalt pavement more scientific and reasonable, carrying out pavement maintenance management is more necessary. Taking advantage of excellent adaptability of neural network technology to deal with nonlinear mapping problem, a breakage condition evaluation model based on radial basis function (RBF) neural network is presented. This model considers four main affecting factors including pavement rut condition, crack condition, pit slot condition and repair condition. Certain number of sample data is chosen to train and simulate the RBF neural network model. The tests results, accordant with expectation, indicate that the model is qualified for practical engineering applications.
Research on Fractional Derivative Viscoelastic Constitutive Relation of Asphalt Mixture
Authors: Yin Hua , Li Yi , Wang Nai Zhou
Published: February 2012

Based on the definition of fractional derivative, the paper proposed a unique new idea to describe the viscoelastic property of asphalt mixture with fractional calculus. According to the SPT (Simple Performance Tests) test results, the dynamic modulus and phase angle of asphalt mixture were determined. The result of the test was fitted with the classical Kelvin model, the Maxwell model, the solid model with three elements, respectively. It showed that the classical viscoelastic model did not simulate the dynamic mechanical properties of asphalt mixture properly. Since the existing constitutive relation cannot describe well the dynamic viscoelastic properties of asphalt mixture, the fractional derivative viscoelastic model with three elements was adopted and its fitting effect analyzed. The result shown a good fitting for the fractional derivative viscoelastic model with three elements, and a few test parameters were required to build the mode. In addition, these simulating parameters were significant in physics. The order  of the fractional derivative has good correlation with the phase angle, incarnating the viscoelastic proportion of asphalt mixture. So the fractional derivative viscoelastic model with three elements can accurately describe the dynamic mechanical properties of asphalt mixture.
Study on Freeze-Thaw Performance of Polypropylene Fiber Reinforced Cement-Stabilized Aggregate
Authors: Ma Yin Hua , Gu Jian Yi
Published: February 2012

In this paper, the authors study the anti-freeze-thaw performance of a new type of semi-rigid base material named polypropylene fiber reinforced cement-stabilized aggregate, and freeze-thaw mass loss rate, freeze-thaw compressive strength, freeze-thaw splitting strength are used to evaluate the effect of polypropylene fiber on the anti-freeze-thaw performance, and the relationship of polypropylene fiber content, polypropylene fiber length with the anti-freeze-thaw performance are analyzed. The test after 10 freeze-thaw cycle shows that the mix of polypropylene fiber increase the freeze-thaw compressive strength and freeze-thaw splitting strength, and decrease the mass loss rate greatly. At the same time, the paper also determine the reasonable fiber content and fiber length, under this mix proportion, the mass loss rate reduce by 80%, the freeze-thaw compressive strength increase more than 12.1% and freeze-thaw splitting strength increase more than 13.4%. This research has laid an important foundation for the follow-up research and practice.
Parent Asphalt Mixture Design of Semi-Flexible Pavement Based on Method of Main Mineral Aggregate Void Filling
Authors: Yang Guo Liang , Wu Kuang Huai , Wang Wei Ming , Meng Fan Bing , Li Yan Feng , Bao Xiu Ning
Published: February 2012

Semi-flexible pavement was a type of pavements in good service performance and its material composition belonged to dense-skeleton structure. However, the material composition of its parent asphalt mixture was a form of skeleton-void structure. In order to achieve better volume characteristics and technical performance of parent asphalt mixture, the parent asphalt mixture design method of semi-flexible pavement based on main mineral aggregate void filling was developed. The parent asphalt mixture was studied using Marshall test and the results indicated that all volume parameters and technical performance indicators of parent asphalt mixture completely satisfied the corresponding technical requirements. The effectiveness of method of main mineral aggregate void filling to design parent asphalt mixture was verified.
The Application of Fuzzy Variable Sets Theory in Eutrophication Evaluation for Urban Lake
Authors: Zhang Xiao Ping , Chen Wei Guo , Xu Wen Jie
Published: February 2012

Eutrophication is one of the most serious water quality problems in the world. Urban lake eutrophication evaluation with the aim of improving urban water environment quality will provide foundations for urban water environment management and remediation. Considering that lake eutrophication evaluation involves many indexes, many rankings and interval values, fuzzy variable sets theory is applied. Based on the premise that the same mathematics model is used, index weights are determined by means of entropy value method, equal weight method and pure threshold value method. Relative membership degree of each index belonging to each ranking can be calculated with relative difference function model. At last, the stability of feature values of classification corresponding to three methods is analyzed and grade of each sample is determined. This model is applied to Lake Dongchang. Three lake regions all belong to the fifth ranking, namely eutrophic. It basically corresponds to reality. So it can be indicated that the proposed model is reasonable and practical.
Experimental Study on Seismic Stability of Shear Wall by Laying Insulated Shale Hollow Brick outside
Authors: Hao Ya Han , He Li Jie
Published: February 2012

Based on the low cyclic reversed lateral loading tests of shear wall thermal insulation brick wall on build by laying bricks, shale brick masonry wall thermal insulation of the failure pattern, deformation and stability and seismic performance ability and shear wall deformation, the seismic performance were analyzed. The results of the study show that the shale hollow brick wall insulation bricks with a good seismic performance stability. If vertical slits were set properly, the transformative property of the shear wall was improved greatly and the seismic behavior was excellent under the condition that the bearing capacity decreased slightly.
Design of Pressure Tunnel with Reinforcement Concrete Lining under Consolidation Grouting
Authors: Su Kai , Li Yin
Published: February 2012

Following the thick-walled cylinder theory, a design progress of pressure tunnel with reinforcement concrete lining is carried out in the condition of water flow continuity. When rock consolidation grouting is adopted to increase rock mass deformation module and to decrease tunnel water leakage, the equivalent permeability coefficient is introduced to tell the influence of consolidation grouting. And the results of a certain tunnel show that the method of consolidation grouting can sharply lower the tunnel water leakage, and the quality of consolidation grouting is more important than the depth of grouting to control water leakage.
Fuzzy Comprehensive Evaluation for Water Resources Sustainable Utilization of Ningxia
Authors: Tang Lian , Zhang Wei Jiang
Published: February 2012

Evaluation of regional water resources sustainable utilization provides a scientific basis for further water resources utilization and social economic sustainable development. How to use a scientific and rational evaluation index system to analyze the sustainable of water resources becomes particularly important .Based on the theory of sustainable development，This paper mainly studied on the case of Ningxia located in the western China. By using the method of fuzzy comprehensive evaluation and basing on the historical data of 5 years, The calculation of comprehensive evaluation matrix is established and the dynamic trend of Ningxia water resource sustainable utilization is evaluated for 2005-2009, and forecasted in 2015as well.
Deep Anti-Sliding Stability of Wudu RCC Gravity Dam
Authors: Feng Fan , Zhang Guo Xin
Published: February 2012

The deep anti-sliding stability of dam foundation has been an important issue in the study of dam field. Rigid body limit equilibrium method and nonlinear finite element method have been adopted on the analysis of sliding stability. In the current paper, the joint element is used to simulate faults, interlayer shear zone and slight inclined fissure zone in complicated geological conditions of Wudu dam. Stress integral method, overload method and strength reduction method are utilized for analysis on deep anti-sliding of Wudu RCC gravity dam, moreover, after being compared with the results by Sarma method, finite element direct force method and geomechanical model test method etc., the consistent conclusion is obtained.
Progress and Perspectives of Microfauna as a Powerful Method for Excess Sludge Reduction in Wastewater Treatment
Authors: Zhao Li Min , Wen Sen
Published: February 2012

Disposal of sewage sludge by environmentally acceptable means is a serious problem, due to environmental, economic, social and legal factors. This paper presents an overview of the potential of the application of the microfauna, such as the aquatic worms and the earthworms in excess sludge reduction in wastewater treatment. Significant sludge reduction was achieved in the presence of the aquatic worms or the earthworms. Additionally, the effect of operating conditions on the excess sludge reduction by the aquatic worms and the earthworms are also presented.
Rainwater Harvesting and Reuse in Sustainable Building: A Design Case Study of DSM (China) Limited Company
Authors: Zhai Jun , Luo Ya Wen , Xiao Hai Wen , He Qiang
Published: February 2012

With the deepening of urbanization, the urban water environment is dramatically changed. The flood peak emerges in advance and flood volume is more tremendous, which results in frequent urban flooding disasters. The increasing demand of fresh water intensifies the shortage of portable water. In combination with the requirements of sustainable building, we design the rainwater harvesting and reuse system in DSM (China) limited. Some structural BMPs measures, such as green roof, managed grass, cobble trench, pervious paving, vegetative swale, sedimentation and fiber filter, are utilized in this project. The treated runoff is reused for flushing toilet in buildings. The stormwater runoff, equal to 90% of the average annual rainfall in the development site, is captured or treated, and 80% of the average annual post-development total suspended solids (TSS) is removed, the rate of total water saving is 71.1%, runoff quantity of post-development is lower than pre-development. The stormwater is filtered and infiltrated to the most extent, which creates a good water environment and a beautiful landscape for the development site. The reduction of portable water utilization brings good economic and social returns for the water system. Additionally, the design is awarded gold of LEED-NC by LEED-NC core committee, which can be a demo project for sustainable building in Shanghai.
PAC Addition on Immersed Ultrafiltration Membrane for the Treatment of Raw Water Containing Taste and Odor Compounds
Authors: Liang Shuang , Li Xing , Yang Yan Ling , Liu Ling , Liu Yong Wang , Cheng Zhen Jie , Li Bo , Li Gui Bai
Published: February 2012

A hybrid process of conventional treatment UF-BPAC (biological powder activated carbon addition on immersed ultrafiltration membrane bioreactor) was evaluated for the treatment of taste and odor in algal-rich water simulated. The results confirmed that in the immersed ultrafiltration membrane bioreactor PAC had sufficient adsorption and long-term biodegradation of dissolved organic materials which cannot be removed by ultrafiltration membrane alone. UF-BPAC processes could intensify the conventional treatment. Through the advanced treatment of UF-BPAC, the average removal ratios of DOC and UV254 increased 19.6% and 30% compared with the conventional treatment process, respectively. Perfect ammonia removal ratio (82.5±5.5%) was also recieved through hybriding the conventional treatment process and UF-PAC process. The major taste and odor compounds from the raw water, 2-MIB and geosmin both fell below the odor threshold, which guaranteed the effluent quality.
Analysis of Circumferential Cracking Due to Wire Breaks in PCCP
Authors: You Ri
Published: February 2012

The prestressing wires of prestressed concrete cylinder pipe (PCCP) provide concrete core with compressive stress to resist internal pressure. Broken wires resulting from corrosion and embrittlement may cause cracking in pipe wall and increase the risk of failure with time. By developing a simplified model to reveal the mechanism of circumferential cracking due to wire breaks in PCCP, the longitudinal bending of pipe wall is analyzed, and the maximum number of broken wires can be determined conveniently by the equations derived in this paper. Verification against results of finite element analysis shows that the presented method has decent accuracy which is not significantly influenced by effective pipe length and wall thickness. By comparing the calculated maximum number of broken wires with the actual number of broken wires detected by inspection and monitoring technologies, circumferential cracking in prestress loss zone can be predicted, thus aiding condition assessment of PCCP.
Parameters Analysis of a Cascade Ethylene-Propane Rankine Cycle with Cold Energy Recovery of LNG
Authors: Zhu Hong Mei , Sun Heng , Liu Hong Wei
Published: February 2012

A cascade ethylene-propane Rankine power cycle that can recover LNG’s cold energy is represented. It is rather appreciated for a CCHP system which uses LNG as the primary energy due to the relatively low operating pressure of the cascade system. The parameter analysis is done for the key process parameters which mainly affect the performance of the system. The results show that the performance can be improved by decreasing the low pressure of the ethylene cycle and increasing the high pressure of the propane cycle. The optimized parameters can obtain 7.43% more electric power and 2.4% more cooling energy.
Effect of Skylight Width on Natural Ventilation in Industrial Workshop
Authors: Su Ya Xin , Wan Xin , Su A Long
Published: February 2012

The authors numerically simulated the natural ventilation in an industrial workshop with heat sources by computational fluid dynamics (CFD) method and the effect of skylight size on the indoor temperature, ventilation rate and air flow patterns inside the workshop was discussed in detail. Realizable k- turbulent model was used to calculate the flow. Results show that a larger skylight width improves the ventilation. The average air temperature at operation zone decreases and the waste heat directly going into the operation zone decreases when the skylight width increases. The ventilation rate increases very slightly when the skylight width increases from 6 meters to 9 meters, while it increases sharply when w exceeds 10 meters. When the skylight width increases, more hot air is exhausted and the higher temperature environment in the upper zone of the workshop is improved.
Study on Damaged Reinforced Concrete Beams Strengthened with Basalt Fiber Polymer Sheets
Authors: He Hua Nan , Dong Wei
Published: February 2012

In practical concrete structures, once reinforced concrete beams serve in case of over cracking or are even damaged due to sudden overloading, it is necessary to repair or strengthened the damaged members for purpose of restoring the structural capacities and keeping the structures working well. At present FRP strengthening technique is one of the most accepted methods available in civil engineering. This paper particularly presents a new FRP material，basal fiber, which is applied to strengthen flexural behaviors of reinforced concrete beams suffering from different amplitudes of cracking damage. Herein, total 4 reinforced concrete beams were tested including one reference beam and three beams strengthened with basalt fiber polymer sheets. The three strengthened beams were preloaded to an expected load and then strengthen by basalt fibers under loading. The test parameters are involved in different pre-loads and layers of basalt fiber sheets. During test some flexural behaviors were obtained in terms of variation of strain in concrete, steel bar and basalt fiber sheet, flexural deflection, collapse loads and the failure modes as well as cracking properties of R.C beams strengthened with basalt fiber sheets. The results of test indicated that flexural behaviors of the beams strengthened under loading with basalt fiber polymer could be improved in different degree with varied initial flexural moment and numbers of basalt fiber.
The Physical and Mechanic Properties of the Loess Landslide
Authors: Li Li Hua , Dang Meng , Xiao Heng Lin , Tang Hui Ming
Published: February 2012

The loess landslide in BaDong city, HuBei province China suffers great losses, which is an extremely typical landslide disaster. Variation in water level in the Yangtse River and rainfall has enormous influence on the loess landslide disaster. Some tests on loess have been done, which mainly include water content influence on shear strength of the loess, the relation between water content and dry density etc. The results have shown that When the water content average increasing with 3%, the cohesive strength reduces with 57%，49%，54% respectively and the internal friction angle average reduces 43%. The bigger the water content, the bigger the shear displacement at the same imposed load. When water content average increases with 3%, the corresponding maximum shear stress reduces with 50%, which may be in favor of loess landslide disaster prevention.
The Application of ULRR-Rainfall Coupled in Forecast Prediction on Debris Landslide
Authors: Zhang Juan , He Ke Qiang , Wang Shang Qing , Wang Wei
Published: February 2012

According to the systematic analysis of the composition and destabilized mechanism of debris landslides, this paper have hydro-geological conditions of the landslide and rainfall combined, research the changes of Unload-load response ratio (ULRR), which is considered as the displacement dynamic parameter of debris landslide in the water environment of different roles and conditions. To further explore the stability and its instability law in different stages of the landslide, establish the ULRR-rainfall coupled warning model in order to improve the accuracy of landslide prediction greatly. Meanwhile, based on the example of Xintan, use the ULRR-rainfall coupled warning model to evaluate and predict its stability. The Evaluation and prediction results match the evolution of slope stability. All results above prove that the ULRR- rainfall coupled is a very effective and reliable new method in the forecast prediction of the debris 1andslide．
Measurement and Analysis of Horizontal Vibration of Standing Human Body
Authors: Ji Jin Bao , Du Yang Yang , Ni Zhi Wei , Li Fang Fang
Published: February 2012

Vibration problem has been destroying the harmony between human being and nature. In order to analyze the effect of vibration on human body, twenty subjects were exposed to random vibration in fore-and-aft, lateral direction in standing position. The accelerations at head, abdomen and leg of each subject were measured. The response was analyzed by means of acceleration sat the measured points and their Fourier spectra and transfer function. The results show that the response curves of all of the subjects in the same direction are substantially the same. The resonance frequencies decreased in different degree. A principal resonance peak around 0.6Hz at different body parts of the same subject. The research results can provide a reference for human body modeling and human comfort evaluation.
The Risk Assessment of Urban Flood Disaster Based on Elevation Ladder Data
Authors: He Xin , Zou Ai Juan
Published: February 2012

With the urbanization, the risk of urban flood disaster has been concern of pubic agency and academy. The related literatures were reviewed and these methods were evaluated. And then the approach for risk assessment of urban flood disaster was proposed based on elevation ladder data. These factor influencing flood process were taken into account such as terrain, elevation, drainage system, building site etc. The result suggests we can calculate the submerged scope and distribution of water depth more accurately and provide an important basis for loss assessment of the objective assessment and prediction analysis of flood disaster.
Torsional Vibration Control of High-Rise Building with Large Local Space by Using Tuned Mass Damper
Authors: Zhao Bin , Gao Hui
Published: February 2012

According to the shake table test results of a high-rising building with large local space, the dynamic characteristics of such structure are complex and the torsional mode becomes the first mode, while the torsional responses under earthquake excitation, especially of the floor just above the large local space, are very remarkable. Special measures are required for such structural system for maintaining its seismic safety. In this research, the bidirectional Tuned Mass Damper (TMD) is employed for reducing the torsional vibration of the high-rising building with large local space. The optimization of the TMD parameters, such as natural frequency, damping ratios and mass ratio, is performed. The time history analysis results indicate that the proposed bidirectional TMD is very effective in torsional vibration control.
Research of City Bridge Passed through by Subway Construction in Health Monitoring and Safety Warning
Authors: Guo Yi Lin , Liu Jing
Published: February 2012

With the rapid urban underground rail development, a considerable number of cities bridges face the impact of the MTR. The subway construction through the city bridges lead to a considerable degree of subsidence, deformation, cracks and even a partial collapse, severely affected the bridge function. As the Beijing Subway Line 10 passing through Xinxing Bridge for the study object，the author set up the health monitoring index system of the subway construction through the city bridge, and analyses the monitoring data and the impact for the processing of subway construction across the bridge.
The Study of SCF about Cross Shaped Board - Welded Hollow Spherical Joints
Authors: Jiao Jin Feng , Lei Hong Gang
Published: February 2012

In this paper, the main influence factors of stress-concentrated coefficient Kt of cross shaped board-welded hollow spherical joints were analyzed by ANSYS. Through the combination of 17 specifications of welded hollow spheres and 40 specifications of cross shaped boards to form 122 kinds of cross shaped board–welded hollow spherical Joints, the paper mainly analyzed the influence on stress-concentrated coefficient Kt from some factors as follows: the length of the connection of the cross shaped boards (a)、the thickness of the cross shaped boards (t) , the outside diameter of the welded-hollow spheres (D) , the thickness of the spheres (δ), the weld size (hf) and the cross shaped boards which are cut or not. The analysis results showed: the SCF of the joints and some factors（a、t、D、δand hf） in all .A cross shaped board to cut its corner or not affected the stress distribution of the joints and the biggest difference between 12%; In the cross shaped boards connected the same length, when it rises to some degree, the influence of (δ) on ( Kt) is smaller; Along with the thickness of the large diameter welded hollow spheres increases, the slope of the stress-concentrated coefficient Kt increases; It is better to choose the hollow spheres with the small diameter or thick wall, and choose the cross shaped boards which shall be a little thinner, and also increase the connected length between the welded hollow spheres and the cross shaped boards; When the weld size is larger than or equal to 12 millimeters, SCF gently changes.
Experimental Study on the Recovery Stress of Shape Memory Alloy Strands and Wire
Authors: Cui Di , Guan Ping
Published: February 2012

Considering the advantages of steel strands in mechanical properties, a new form of shape memory alloy (SMA) wire, SMA strands, is designed in this study. To compare the recovery properties of martensitic SMA strands and SMA wire, the recovery stress of which with different prestrains were tested by using a material testing machine with a temperature-controlled cabinet. In this experiment, the SMA strands and the SMA wire have the same composition and the same cross-sectional area. The experimental results show that the maximum recovery stresses of the SMA strands with different prestrain are almost the same, which illustrates that the prestrain has no much effect on the maximum recovery stress of the SMA strands. Moreover, the recovery stress curve in heating stage does not coincide with that in cooling stage. Furthermore, the residual recovery stress of the SMA strands in cooling stage is also smaller than that of the SMA wire. This demonstrates the SMA strands can recovery initial state better.
Fatigue of Carbon Nanotube-Reinforced Composites
Authors: Zhang Z. H. , Yu N.
Published: February 2012

The present work studies the fatigue strength of carbon nanotube-reinforced composites. The as-received muti-walled carbon nanotubes are separated and distributed in epoxy using a sonication method. The fatigue specimens are tested in a rotating beam testing machine. Effects of reinforcement and notch on the stress – life behavior are experimentally characterized.
Research into the Method of Accuracy Optimization in Survey Programming of MATLAB
Authors: Gong Yu Sheng , Zhang Li Ping , Han Qian
Published: February 2012

In the process of survey data processing, solving problem can usually be attributed to linear equations like Ax=b, but under some circumstances, the equations may be ill-conditioned, if conventional method of MATLAB still be used in programming, the solution worked out may not be the true one. To solve this problem, method of introducing symbolic calculation into programming has been proposed in order to make ill-conditioned feature of designed equations better and improve stability and accuracy of parameter, the superiority in GNSS elevation fitting has been proved by triple-order polynomial curve-fitting method.
Finite Element Simulation of RC Beam Strengthened with FRP
Authors: Fu Chao Jiang
Published: February 2012

The finite element modeling is established for reinforced concrete(RC) beam reinforced with fiber reinforced polymer (FRP) using the serial/parallel mixing theory. The mixture algorithm of serial/parallel rule is studied based on the finite element method. The results obtained from the finite element simulation are compared with the experimental data. The comparisons are made for load-deflection curves at mid-span. The numerical analysis results agree well with the experimental results. Numerical results indicate that the proposed procedure is validity.
Dynamic Properties and Seismic Responses of the Masonry Structure Model Strengthened with BFRP Laminates
Authors: Xu Li Hua , Zhang Si , Hu Xiao Bin , Zhang Ming Jie , Yang Fan , Cai Yin Liang
Published: February 2012

To study the dynamic properties and seismic responses of masonry structure strengthened with Basalt Fiber Reinforced Plastic (BFRP) laminates, modal experiment and shaking table test were performed on a two-storey and two-bay masonry structure model involving constructional columns. Through the test, the dynamic properties of reinforced masonry structure were obtained, the development of cracks and degradation of stiffness of the reinforced masonry structure under earthquake were studied and the variations of displacement, acceleration, stress of this structure were analyzed. Based on the modal experiment using the impact hammer test method, a simplified numerical analysis model of the test model was proposed for modal analysis. From the shaking table test, it is concluded that BFRP laminates can slow down the degradation of structural stiffness and the development of cracks effectively, and the masonry structure reinforced with BFRP laminates has excellent seismic performance.
Experimental Study of Bond Stress Distribution between Reinforcement and Different Strength Self-Compacting Concrete Bond under Dynamic Load
Authors: Luo Su Rong , Zhuang Jin Ping , Wang Yi
Published: February 2012

The bond characteristics between reinforcement and self-compacting concrete under dynamic loads was analyzed experimentally. The tests were conducted by pulling-out with setting strain gauge in reinforcment. The bond stress distribution laws were analyzed with concrete strength change.
The Representative Volumetric Parameter for Dense-Graded Asphalt Mixture
Authors: Wang Da Qing , Tan Yi Qiu , Xu Hui Ning
Published: February 2012

Volumetric parameters of asphalt mixture are essential for a better understanding of the properties of an asphalt mixture. This is even more applicable for a dense-graded asphalt mixture, where volumetric parameters have a significant correlation with its pavement performance, especially against rutting and moisture. This paper deals with the choice of the representative volumetric parameter for dense-graded asphalt mixture. A total of 6 volumetric parameters were studied. Volumetric analysis showed that linear correlation existed between any two of volumetric parameters. The change of volumetric parameters was mainly caused by the variation of gradation. The test result indicated that volumetric parameters were sensitive to the variation of gradation. The finding also indicated with the variation of gradation, the change rate of is the largest. Based on the research above, was selected as the representative volumetric parameter for dense-graded asphalt mixture.
Analysis and Design of Strengthened Hyperbolic Cooling Tower by Using PDS Module in ANSYS
Authors: Wei Xin Xin , Wu Yi Bin
Published: February 2012

In consideration of the uncertain factors, a hyperbolic cooling tower with initial geometrical imperfections is studied by the PDS module in ANSYS. Contrastive analysis is made on stress, internal force, displacement and failure probability of cooling tower shell. It is indicated that the value of Mx and Ty is sensitive to the initial geometrical imperfections, and the failure of shell in imperfections increase in large. On top of this, the non-local cooling tower shell strengthened with FRP is found to solve the insufficient capacity, which is proved to be feasible. Lastly, the reliability analysis and design of tower shell strengthened with FRP are also carried out. It is proved that the probability design of strengthened shell can assure structure to meet the requirement of target reliability.
Calculation of Areas of Cultural Relics Surface Defects Based on the Triangular Mesh Model
Authors: Zhang Xiao Qing , Hou Miao Le , Zhu Guang , Hu Yun Gang
Published: February 2012

In order to solve the problem that need exact and scientific data in checking and restoring cultural relics, this paper presents a novel algorithm that statistics defect areas of cultural relics by calculating holes area in the in triangular mesh models.First, build the topological relationship between triangles, vertices and edges and extract boundary using boundary property of triangular mesh. Next, the holes bounding edges are linked in sequence into holes polygon. Finally, distinguish holes boundary and model exterior boundary by means of triangular mesh topological characteristics and the areas of three-dimensional holes polygon are calculated to statistics defect areas of cultural relics through the method of coordinate. Through experiments, it proved that this algorithm was correctly and reasonable.
The Control Effect Analysis of the Variable Frequency TMD Applied to the Frame Structure
Authors: Zhang Mao Yu , Li Bo , Wang Yan Ru
Published: February 2012

Frequency variable TMD system is developed based on the conventional TMD system, which has multiple frequencies and thus merits of MTMD. Frequency variable TMD can effectively reduce the dynamic response of structure induced by its own frequencies. In this study, this technique is applied to dynamic analysis of high-rise building. The results show that frequency variable TMD system can optimize the dynamic response of the structure and control the vibration effectively, compared to conventional TMD system.
The Effects of Geometric Nonlinearity on Elasto-Plastic Analysis of Plane Steel Frames in Fire
Authors: Xia Bing , Wu Yu Ching
Published: February 2012

In this paper, the co-rotational total Lagrangian forms of finite element formulations are derived to make elasto-plastic analysis for plane steel frames either under increasing external loading at ambient temperature or under constant external loading at elevated temperatures. Geometric nonlinearity and thermal-expansion effect are taken into account. A series of programs are developed based on the formulations. To verify the accuracy and efficiency of the nonlinear finite element programs, a couple of numerical benchmark tests are carried out. And the results are in a good agreement with solutions from literature. The effects of nonlinear terms of the stiffness matrices on the computational results are investigated in detail. It is demonstrated that the influence of geometric nonlinearity on the incremental step by step finite element analysis for plane steel frames in fire is limited.
A GIS-Based Analysis on the Characteristics of Ancient Architectures in Taizhou, Zhejiang Province, China
Authors: Xu Ruo Qi , Peng Hua , Zhang Deng Rong , Huang Chu Dong , Li Ying Hao , Tai Hui Xin
Published: February 2012

Ancient architectures have always been of great interest to a variety of studies. In this analysis, the distribution of ancient architectures in Taizhou, Zhejiang Province is investigated. In each area of the distribution, the characteristic of the ancient architectures are recorded, such as story number, building materials, construction time, etc. The various types of information are then input into a GIS (Geographic Information System) database, which also contains some typical images of the ancient architectures. Some of the data are from GoogleEarth or archived CAD (Computer Aided Design) files. Consequently, the distribution and characteristic of ancient architectures are analyzed consulting the GIS map and attribute table. Although the ancient architectures are similar in Taizhou, Zhejiang Province, there exist some notable differences. The commonness and differences would be significative for the preservation and planning for ancient architectures.