bluuebunny/crossref_metadata_2025 huggingface dataset:
Seismic Performance Analysis of Fill Slope with Pre-Stressed Anchors
Authors: Jin Qi Wen , Xu Qian , Wang Tong Ning , Geng Fei
Published: August 2013

Pre-stressed anchors were widely used to strengthen slopes, in this passage the dynamic responses of fill slope with pre-stressed anchors under the effect of seismic load were simulated by ANSYS program. And it was mainly analyzed the effect of pre-stress anchors on seismic performances of slope under general earthquake. The results indicate that changing the value of pre-stress has little effect on slope deformation, but has larger effect on stress distribution in slope. And with the increases of pre-stress value, stress response on the top of slope is small, the stress concentration in slope is alleviated, while the stress on slope toe increases a little, the seismic stability of slope is improved to some extent. And these conclusions may provide some theory basis for slope seismic design and study.
Review on Seismic Behavior of RC Columns
Authors: Xie Yong Ping , Jia Lei , Sun Gang
Published: August 2013

Column is the key member of the seismic structures, after the earthquake destroyed, not only cause column serious economic damage, and will cause a large number of casualties. For studying the seismic behavior and size effect of full-scale reinforced concrete columns. A comprehensive summary of the experimental results is undertaken to evaluate the seismic behavior of RC concrete columns, including test equipment and load method and mode of failure and Seismic behavior. It is concluded that the ductility and shear capacity of RC mainly depends on shear span ratio, axial load ratio and stirrup ratio. But the seismic behavior of large scale RC columns has no systematic studied.
Calculation and Analysis of a Tall Building Seismic Isolation Design
Authors: Cai Hao Ming , Tao Zhong , Cao Xin Li
Published: August 2013

In this paper, we calculate and analyze a tall building project of seismic isolation design. It is a frame-shear wall structure, which has twelve stories on the ground. And then, we use the time history analysis method to calculate the isolation structure. It is found that isolation equipment can extend the period of the structure, reduce the story drift in frequency earthquake. And it also can control the response of the structure. In rare earthquake, the story drift can meet the demand of unclasped; the displacement and force of the equipment can satisfy the demand of the code for seismic design of building.
Research on Tuned Mass Damper for Vibration Control of Tower under Multi-Dimensional Seismic Excitations
Authors: Dai Yu Wei , Liu Chao , Li Wen Feng , Tian Li
Published: August 2013

The tuned mass damper (TMD) for vibration control of tower subjected to multi-dimensional seismic excitations is studied in this paper. Calculation model of the tuned mass damper is introduced, and the equations of motion of a tower with tuned mass damper are derived, and the calculation parameters of the tuned mass damper are given based on the control structure. According to a practical engineering, the three-dimensional finite element model of a tower is established using SAP2000. Three typical seismic records are selected according the code of seismic design. Vibration control for tower model with tuned mass damper under multi-dimensional seismic excitations is performed by using numerical simulation. The maximum responses of displacement and axial force of the tower structure without and with TMD are obtained. The results show that the TMD could decrease the responses of the tower in three directions, and the tower with TMD can be a reference for tower practice engineering application.
State-of-the-Art of Seismic Response of Utility Tunnel
Authors: Jiang Lu Zhen
Published: August 2013

A state-of-the-art review of the seismic response of utility tunnels is presented. The objectives of the review are to present a view of current state of utility tunnel and to examine trends in the future. The review includes: the theoretical analysis, numerical simulation and experimental research on the utility tunnel under earthquake wave excitation. Based on the review, the future scope of work on the subject is outlined.
Investigation of the Constitutive Modle of Saturated Frozen Soil Based on Damage
Authors: Zhang Shuang , Tang Chun An , Li Lei , Li Shuai
Published: August 2013

Saturated frozen soil is composed of soil, unfrozen water and ice, whose subgrade deformation is due to the weakened of internal structure which coursed by damage of the materials in the process of the cycle of freezing and thawing. Considing of the heterogeneity of saturated frozen soil and the phase transition between water and ice, and using of the damage mechanics theory, thermodynamics theory, filtration mechanics theory, a constitutive model of saturated frozen soil is setted up, which is of the coupfing problem of temperature field, water field and stress field. The rationality and validity of the model is verified by the experiment. It is also provided a new method for the study of frozen soil.
Shaking Table Test of Multi-Tower Self-Anchored Suspension Bridge
Authors: Zhang Chao , Fang Zhen Zheng
Published: August 2013

As a new kind of bridge structure, multi-tower self-anchored suspension bridge (MSSB) has complicated mechanical characteristics. So far, the research on dynamic performance of MSSB is limited to theoretical and numerical simulation. Based on the first three shaking table system in China, shaking table test of MSSB is carried out. The modal test and seismic excitation test show that the performance of fundamental mode shape is anti-symmetric vertical bending vibration of girder, coupling with longitudinal bending vibration of middle tower. Seismic response of middle tower is greater than side towers. At last, 3D finite element model of test specimen is established and test process is numerical simulated by FEM. Simulated result is agreed well with test record.
Study of Disaster Prevention Design Criteria in Typhoon-Rainstorm Prone Regions of China
Authors: Pang Liang , Li Zhi Qiang
Published: August 2013

With global warming and sea level rising, the frequency and intensity of typhoon-rainstorm induced disasters have been increasing. The infrastructures in typhoon-rainstorm prone area are menaced by natural hazards. This paper aimed to compare the risk level for infrastructures designed by China design code and by our proposed Multivariate Compound Extreme Value Distribution (MCEVD) model. Risk assessment of some important infrastructures in typhoon-rainstorm prone areas are performed using MCEVD as follows: disaster prevention design water level for estuarine city Shanghai and design flood volume for Three Gorges Dam (TGD).The calculation results show that risk assessment based on MCEVD is a reasonable method for engineering planning, design, construction and management.
Security Reliability Analysis of Circulating Water Pump House Pit Excavation of Chen Jiagang Power Plant
Authors: Pan Jian , Ding Xiao Yong
Published: August 2013

The circulating water pump house pit excavation of Chen Jiagang power plant is characterized with complex geological and hydrological condition, high water level, and weakly permeable silt layer within the scope of pit excavation. Based on design and construction principles of safety, feasibility, rationality and economy, different foundation pit dewatering and support programs were analyzed and compared, a excavation method featured with well dewatering and steel pipe soil nails hanging net and stakes was elaborately designed, and establish a monitoring feedback system. And in the base of mathematical statistics, Taylor series method is used to analyze the reliability probability problems of excavation slope stability analysis. The successful implementation of the project indicated that the design and parameters of Chen Jiagang power plant circulating water pump house pit excavation is feasible, and Taylor series method combined with conventional safety factor is able to analyze the influence of material parameters variation on the excavation of the slopes safety.
Research on Risk Management of City Underground Space Based on Emergency
Authors: Zheng Zhi Gang , Chen Zhuo
Published: August 2013

With the large-scale development of city underground space, all kinds of unexpected events in underground space have broken out in a rising trend. By analyzing the disaster-causing mechanism of city underground space emergencies, the vulnerability of city underground space and the early warning management mechanism of city underground space emergencies, this paper establish a risk management system of city underground space based on emergency to realize the harmonious development of city underground space.
Trend Study on Economic Loss Induced by Typhoon Disaster in Chinas Southeast Coast
Authors: Xu Bei Lei , Liu Li Ding , Ji Bai Feng
Published: August 2013

Chinas southeast coast is one of the regions with most severely influenced by typhoons in the world, which suffers significant casualties and huge economic losses every year. In this paper, the trends of economic loss educed by typhoon disaster in coastal areas of southeastern china were studied using regression analysis methods. Firstly, the data sources were introduced and the typhoon landing areas are all over the east coast of China were analyzed.Then, development trends of the affected area , deaths, houses collapsed and the direct economic losses were studied in detail. The results indicate that the affected area and deaths induced by typhoon disaster fluctuate greatly and the number of deaths has been showing a declining trend. The linear regression, exponential regression and logistic regression analysis results all indicate that the number of houses collapsed due to Typhoon present a downward trend year by year while the direct economic losses induced by typhoon disaster present an upward trend year by year.
Numerical Simulation of Liquefied Propane Gas Storage Tanks Full-Size Pool Fire Based on FDS
Authors: Li Qing Gong , Song Wen Hua , Zhang Miao , Lei Yu
Published: August 2013

This paper takes a 50000 m3 liquefied petroleum gas storage tank in a chemical company in Tianjin for an example, and adopts the fire simulation software FDS to make numerical simulation for the whole-area pool fire accident in the liquefied propane gas tank. The variation of flame and the flue gas in the combustion process of pool fire is obtained from the simulation. The simulation results show that flame shape, smoke production rate and thermal radiation intensity is small in the early pool fire, and significantly increases with the development of combustion process, finally maintains in a relatively stable state.
Fire Risk Assessment and Numerical Simulation of the Pool Fire in the Epoxy Propane Tank
Authors: Li Qing Gong , Song Wen Hua , Zhang Miao , Chen Zhen
Published: August 2013

This paper takes the epoxy propane tank area in a chemical company in service for an example, and conducts the fire risk assessment and numerical simulation of pool fire in a single tank of this area. Through the analysis of burning flame shape, flue gas velocity of flame center and the variation of thermal radiation intensity, the destructive power of pool fire to surrounding equipment, tanks, buildings is obtained, the degree of damage to workers and rescuers around is determined. The study results are of important clinical significance for the fire fighting and safe evacuation in the epoxy propane tank area.
Study on the Security Survey of Rural Housing
Authors: Zhao Kao Zhong , Liu Long Long
Published: August 2013

In recent years, natural disasters occurred more frequently in our country, dangerous housing in rural areas often cause a lot of casualties and property losses. Due to the shortage of national financial, the government decided to focus financial support on the renovation of dilapidated buildings. In order to have a deep understand of the rural structure, distribution law and the proportion of the dilapidated housing, after the survey of the housing situation in Dongying County Dongying City, Jiaxiang County Jining City and Yiyuan County Zibo City, this article made the statistics and analysis of the status of housing in these three counties. The result of analysis and statistics show that the rural housing mainly conclude adobe housing, brick masonry housing and block masonry housing, the proportion of dilapidated houses in rural housing is about 10.9%, the dilapidated buildings are mainly distributed in the mountain, because the mountain areas foundation of economic is weak, and the housing structure is mainly in the form of adobe housing and stone masonry housing. The main types of dilapidated housing are adobe housing and stone masonry housing primarily, the brick masonry housing newly built is in relatively low risk level. The government finances should inclined to transform the dilapidated housing in the mountain area first. In order to improve the quality of new housing in rural areas, this new housing in rural areas will also need to pay attention to the problem made some conclusions.
Analysis on the Flow Passed a Pervious Cubic-Blunt Body Based on Large Eddy Simulation
Authors: Ye En Li , Zhou Yi Hong , Ren Lei
Published: August 2013

To overcome the deficiency that model experiments are unable to take accurate measurements without damaging the structure of the fine flow fields, a large eddy simulation is employed to simulate the three dimensional structure of the flow passed a pervious cubic-blunt body at Re=2.2×104. A comparative analysis have been taken qualitatively and quantitatively between the flow passed a pervious cubic-blunt body and the flow passed a non-pervious cubic-blunt body from the aspects of the flow structure (mainly including separation and reattachment), unsteady vortex shedding, distribution of static pressure and drag coefficient, etc. Therefore, characteristics of this kind of flow field are concluded and along with a better understanding of concrete effects they bring, which can give guidance to engineering.
The Numerical Simulation Research about the Deformation and Stability of Cut-Off Wall´s Foundation Trench Zhikong Hydropower Station, Tibet, China
Authors: Huang Qing Song , Li Yu Sheng , Ye Song
Published: August 2013

Through the numerical simulation research about the deformation and stability of cut-off wall´s foundation trench in Zhikong Hydropower Station China [1]. The text explained the major factors which were construction scheme and the strength of interior bracing structure of the deformation and stability about the foundation trench. In the early construction, the two reasons caused the large deformation. When adjusted the construction scheme and the strength of interior bracing structure, the deformation state of foundation trench and supporting system became much better.
Influences of Flow Discharge Processes on Morphological Evolutions in an Experimental Channel: A 3-D Numerical Study
Authors: Jia Dong Dong , Shao Xue Jun , Zhang Xing Nong , Chen Chang Ying
Published: August 2013

The discharge process influences the morphological evolutions of alluvial rivers, even the channel pattern evolutions. The impacts of discharge processes on morphological evolutions in an experimental channel were investigated by a 3-D mathematical model, in which turbulence flow and sediment transport as well as bank erosion were modeling. The simulated results demonstrated that the discharge process had significant effects on morphological changes. Planfrom evolution in the period with large discharge was much more notable than that with small discharge. Different discharge processes may lead to different channel patterns. A single meandering channel was formed under steady flow condition. A braided channel was observed with unsteady flow condition.
Study and Application of Three-Step Supporting Design Method in Coal Roadway
Authors: Shan Ren Liang , Kong Xiang Song , Zhou Ji Jun , Zhao Wen Feng , Tao Yu , Wei Zhen
Published: August 2013

Scientific supporting design is of great significance to ensure coal roadway stability. The three-step supporting design method is put forward for coal roadway support: The first step is preliminary design, determine the range of each supporting parameter according to the theoretical calculation and supporting experiences; the second step is numerical simulation calculation, choose the reasonable one through the comparison of schemes; the third step is field monitoring, verify the scheme applicability. After applying the three-step supporting design method to study 3# coal seam roadway in Guandi mine, the optimal supporting scheme is obtained, and good results of underground roadway are achieved, which ensure the stability of roadway surrounding rock. Meanwhile, some rules are summarized which provide references for future roadway supporting design.
Study on the Capacity Increasing and Dam Heighten of Plain Reservoirs
Authors: Song Xiu Guang , Zhou Zhi Dong , Zhang Hong Bo , Yue Hong Ya
Published: August 2013

In order to solve the problem of differential settlement, seepage flow and stability between the new and old dam boundary in capacity increasing of the plain reservoirs, the comparative analysis on the stability of the dam slope with different methods on dealing with the new and old dam boundary was performed by numerical simulation with FLAC3D. The result shows that combining the new and old dam by using geogrid indicates superiority for reducing differential settlement, improving the dam stability and safety, etc. In the meantime, on the basis of actual site investigation and theoretical analysis, combined with the requirements of design, construction and management in capacity increasing of the plain reservoirs, the key construction technology was put forward and widely applied foreground, which can improve the quality of the construction, reduce engineering disease and provide references for capacity increasing engineering of in plain reservoirs.
Prevention and Control of Surface Water Hazard in Coal Mine
Authors: Guan En Tai
Published: August 2013

On the basis of different damage forms of surface water in coal mines, various prevention and control countermeasures to water hazard in different landforms, such as mountainous area, plain area and hilly area, were proposed. In general, the objects to be governed include river banks, plashes, slopes, gullies and surface collapses due to underground mining or karst cave to avoid the hazard. The principle is cutting off the relationship or passage between surface water and underground mining. Furthermore, advices and techniques on water passage detection were put forward to carry out the following work.
Application of Internet of Thing Technology in Ecological-Environmental Protection of Long-Distance Water Diversion Project
Authors: Wu Dan Feng , Dai Ling Quan , Dai Hui Chao
Published: August 2013

In order to rationally use water resources and meet the demands of human society, long-distance water diversion project develops rapidly in recent years. However, its effects on the ecological environment resulting from construction and operation are becoming increasingly prominent and need to be solved. With the rapid development of the network, ITT has been widely used in various fields, providing great convenience for human life and social development. A case in point is the gradual application of the ITT to water conservancy. Through the analysis of the effects caused by long distance water diversion project on the ecological environment, this paper discusses the basic conditions of ITT application in hydraulic engineering and throws light on its application in ecological and environmental protection of long-distance water diversion project.
Hydraulic Model Study on a Special CSO Chamber
Authors: Chen Yong Min
Published: August 2013

In order to research the siltation problem of pressurized CSO chamber with the outlet pipe elevation higher than that of the inlet pipe, a 1:5 scale model was made of plexiglass for laboratory experiments. The velocity field of the CSO chamber was measured by PIV system. VOF and DPM models were adopted in the numerical simulation, and the results were applied to the comparison and analysis with the field inspection images obtained by SONAR system. Research results show that this special CSO chamber is liable to result in siltation in dry weather flow. The deposit location and shape of sediment depend on the flow field distribution. At low flow, there is low velocity eddy zone at the central region of CSO chamber, and then there is a bulge in the middle of sediment contour line in horizontal plane. With the increase of flow, the scouring force of middle region enhances, and then the sediment contour line tends to a straight line. Furthermore, there are relatively strong scour areas at both sides of inflow which result in the trend to be flat of sediment surface. These analyses are validated by field inspection of SONAR.
Experimental Study on the Flow Characteristics of Fish-Bone Type Dividing Dike
Authors: Chen Li , Wang Ping Yi , Yu Tao , Zhang Fan , Li Liang
Published: August 2013

The flow characteristics of fish-bone type dividing dike is very complicated. By model experiment, this paper deeply research in water surface line, velocity distribution and the flow regime of fish-bone type dividing dike. It can Provided the certain basis for the design of fish-bone type dividing dike, such as a fishbone in dam engineering stab dam ridge direction, length, and layout spacing, length.
Response of Typhoon-Induced Water Level to Different Typhoon Tracks in Haizhou Bay
Authors: Zhang Cun Yong
Published: August 2013

Typhoon-induced water level in response to different typhoon tracks in Haizhou bay was investigated by the tidal data from 1997 to 2007. Results of the study show that typhoon passing over Haizhou bay can be divided into three classes according to their tracks. Under different tracks of typhoon, the typhoon-induced water level varies with the magnitude and duration. The non-tidal water level increase significant during class I and class II tracks, while the typhoon-induced water level during class III is less regular with relatively uniform amplitude. The duration of the typhoon-induced water level of class III is the longest among the three types.
Study on Deformation Property of Soft Soil Based on Neural Networks
Authors: Liu Yong Jian , Li Zhang Ming , Wang Yin , Liu Yi Mei , Chen Yong Jian , Lin Hui
Published: August 2013

Based on the triaxial test results of soft soils, an error back propagation network predicting model for deformation property of soft soil is built. Improved BP neural network model is trained by additional momentum term, adaptive learning rate and Bayesian regularization performance function. Research shows that improved BP neural network model applied to predict soft soil foundation settlement, has fast computation, high accuracy, strong generalization ability, and good capability of matching the real data and the measured one. According to test data, the creep models can avoid any artificial assumption of complex constitutive equation, and can reflect nonlinear creep properties of soft soil objectively, thus has better fault-tolerance and more convenient than the traditional method.
Experimental Device and Study on Interfacial Shear Stress of the Laminar Soil
Authors: Zhang Chun Yan , Xu Guo Hui , Wang Gang
Published: August 2013

A designed measuring device of soil interfacial shear stress is introduced in this paper. We used the device for measuring the shear stress between the soil interface, of which the moisture content was 30% and the clay content were 5%, 9%, 15%, 21%, 30% respectively. The results show that the shear strength of experimental soil and friction between the layers decreases with the clay content increasing when the moisture content is 30% and clay content is more than 15%, and the results increase with the clay content increasing when the clay content is less than15%. Based on the study of the laminar soil interfacial shear stress, it provides the basis for the future research of the laminar motion of the sediment and the deposition of the liquefied motion soil.
The Leaking Protection Technology of Structural Deformation Joint after Cracking
Authors: Zhang Yan Mei , Li Hong Wen , Jin Ding Hong
Published: August 2013

In this paper, through dealing with the leakage protection of underground engineering,do the research in leakage protection problems of groundwater seepage caused by concrete cracks and foundation settlement in underground concrete engineering,for the structure with different crack leakage protection in different methods, is discussed in aspects of material selection, construction process.Especially for the water leakage problem of the concrete structure,the settlement of the structure caused by the settlement joint and the stretching of expansion joint caused by the air shrinkage and temperature change of concrete.Change the past with rigid material plugging, by reasonable selection of material, the comprehensive application of the rigid and flexible materials,to solve the problem of water leakage caused by structure settlement joint and expansion joint, so as to solve deformation instability problem on the structure of settlement joint and expansion joint after leakage.
Comprehensive Life-Cycle Assessment of SIP Building
Authors: Du Qiang , Zhang Huan Fang , Liu Nan , Yin Xu Sheng
Published: August 2013

Structural Insulated Panels (SIPs) are high performance load-bearing panels, which are considered to be the next generation construction material. Based on the results of the previous studies on SIP building, combined with the theory of life-cycle assessment, this paper constructs a dual-index evaluation model of economical efficiency and carbon emission in life cycle. By adopting the data of previous research, comparisons were conducted between SIP building and traditional masonry-concrete house, which suggests significant advantages of SIP building. The results implicate that SIPs would have extensive popularization potential in the process of development of low-carbon buildings.
Study on the Relationship between Ergometer and Tensioning Force of Pre-Stressed Pier Anchor Cable
Authors: Xing Jun , Fan Zhi Xin
Published: August 2013

During the construction of pre-stressed anchor cables for discharging flood and sand in the lower reservoir of Pushihe Pumped-storage Power Station, the tensioning of main and secondary cables are overall carried out according to design, in which the tensioning force is divided into seventh grades, the indicator values of ergometer and tensioning force of jack were obtained by experiment, and the difference between them were compared and analysis, the results of experiment provides the basis for the long-term and stable operation of pre-stressed pier in Pushihe project.
Transformers in Architectures-Applicability Study on the Architecture with Mobile Roof
Authors: Li Jia Wei , Gao Yu Bo
Published: August 2013

Mobile roof structure is a new type of architecture in which part of, or all of the entire roof can be moved or retracted within a short period of time so that the building with movable roof can be used in open or closed states. The time spent by the movable structure in opening or closing generally ranges from 10 to 30 minutes, and it adopts mechanical control. The open efficiency of the structure concerns the economic efficiency of the architecture, and different architectures with distinct functions also have different open efficiencies. However, generally speaking, 75% is the relatively appropriate open rate according to the statistics.
Design and Test of Self-Draining Pile
Authors: Li Fu Rong , Sun Hou Chao , Zhou Qian
Published: August 2013

putting out a new pile type, that is, making the precast concrete pile with a vertical side channel and pouring the yellow sand, which lead to the pile had the self-draining function, reduce the soil squeezing effect of precast concrete pile construction in saturated soft clay, that is, the design principles and methods of self-draining pile. Indoor model test showed that the self-draining piles could reduce the pore water pressure, and its effect was obviously, its role is equivalent to sand wells, sand bags wells or plastic drain board, which meet the requirements of the construction technique.
On the Investigation of Protection Technique for the Old City Wall of Ming Dynasty-Xian 4th Tube Line Construction
Authors: Li Jing Zhu , Xu Jian
Published: August 2013

In this paper Xian 4th tube line is selected as the research target, the earth surface deformation is evaluated based on the soil surface deformation model, and the influence of construction of Xian 4th tube line on the city wall of Ming dynasty is investigated, the protection scheme and rules are proposed when the tube pass through the city wall, the influence on the wall is evaluated during the tube operation and the protection technique is also proposed, which will reduce the influence from the construction and operation of tube, and the friendly development between the railway transportation and environment is realized.
The Optimal Choice of Water Saving Irrigation Mode
Authors: Liu Ying
Published: August 2013

Using the analytic hierarchy theory and method to evaluate the related project for optimal selection of water-saving irrigation in the area of Xiaoshan in Zhejiang province. Establish the analysis model of optimal irrigation level and get the total ordering of water saving irrigation mode. Ultimately choose the sprinkling irrigation as the optimal irrigation.
Research on the Optimal Construction Scale for Rural Safe Drinking Water Projects in Qingdao Based on GA and GIS
Authors: Li Qing Guo , Jin Li , Liu Jian Qiang
Published: August 2013

In order to determine the reasonable construction scales of the water supply projects in rural areas, in this paper, we firstly analyzed the major influencing factors to safe water supply projects construction scale. Secondly we respectively establish correlation equations between scales and water works construction cost, pipeline network cost and running cost. Further, with the correlation equations we propose an optimal model for projects construction scale and suggest a water supply projects construction scales optimization analysis methods in rural area based on GIS & GA. Finally the model and methods are used in Jiaonan rural area in Qingdao, and obtained the optimal solution also the economic reasonable water supply projects scale of this rural area.
Optimal Design of Branch Distribution Network in Rural Drinking Water Safety Project
Authors: Wang Wen Fen , Cheng Ji Lin , Zhu Hong Geng
Published: August 2013

On the basis of the traditional linear programming model,this paper presents a optimal design mathematical model of gravity branch distribution network. Considering the coupling constraint, the model takes the length of main and subordinate pipe having standard diameter as decision variables. The minimum works investment is taken as objective variable, and the MATLAB is used to solve. There are a better result in the optimal design of branch distribution network with this method in the application cases, and which can provide a basis for the rural drinking water safety project.
Research on the Room Temperature Distribution of Experimental Classroom in Summer
Authors: Chen Ge Wei
Published: August 2013

Combining the experimental teaching in polytechnic, the room temperature distribution of the experimental classroom in summer was analyzed by temperature measure and computer simulation. The results provide the foundation for the rationalization distribution of experimental equipment, person and air conditioner in experimental classroom. It helps to optimize teaching environment, reduce energy wastage, and avoid the hidden trouble bringing by hot summer.
Analysis of Natural Cross-Ventilation in Buildings Driven by Wind and Buoyancy Forces
Authors: Liu Jing , Shui Tao Tao , Ma Fei
Published: August 2013

In order to investigate natural cross-ventilation in buildings driven by combined wind and thermal buoyancy forces, computational fluid dynamics (CFD) with the DES model is applied. The aim of this paper is to investigate the influence of thermal buoyancy force on natural ventilation in buildings under different heating conditions. The simulation results indicate that the thermal effect has a significant impact on airflow structure and airflow rate of building at low Froude numbers, however, the thermal effect can be neglected when Froude number value is greater than 6.
Passive Ventilation Cooling Strategies on Modern Architecture
Authors: Qiu Jing , Qiu Yu
Published: August 2013

With the increasing number of compound or deep-plan buildings, application and research on passive ventilation cooling system in construction is developing from single and directed way to multiple and indirect ways ,from not easy to control to easy to control, from simplicity to systematization. This paper summarizes four kinds of passive ventilation cooling types. Their techniques and adaptability are discussed .The disadvantage of natural ventilation cooling is pointed out. It proposed that indirect controllable ventilation cooling may be used in large depth, enclosed public buildings.
Method for Mapping from Thermal Comfort Requirements to Energy Design Factors of Air-Conditioning
Authors: Wang Yan , Liu Guang Fu , Zhang Lei , Zhou Dan
Published: August 2013

In order to satisfy human thermal comfort requirements (TCRS), meanwhile, optimize air-conditioning energy property in use stage as design objective, a model of mapping from TCRS to energy design factors (EDFs) of air-conditioning based on house of quality was presented. Through determining the elements of TCRS, analyzing the relevance information between the TCRS and energy property, and extracting EDFs of air-conditioning in use stage, the connection with TCRS, air-conditioning energy characteristics and EDFs were illustrated by the house of quality. The importance degree of EDFs was calculated by using rough number and fuzzy mathematics, and so that the mapping from TCRS to EDFs of air-conditioning was realized.
Research on Influence Factors and Formulae for the Bearing Capacity of Twin-PBL Shear Connectors
Authors: Zhang Zhi Hui , Liu Peng , He Shuan Hai , Ji Tong Geng
Published: August 2013

Relying on a practical application in pre-stressed concrete box-girder with corrugated steel web, four models of Twin-PBL shear connector are made and experimented in push-out test. The main research contents are influences for bearing capacity and load-slip relationship. The results show that: when the size of holes on the steel plate has a definite value, the connectors bearing capacity get a significantly development when the diameter of reinforced-throughout increases in the appropriate range. If the space between reinforced-throughout and holes are too small, the coarse aggregate will be prevented into the holes so as to reduce its bearing capacity. In addition, thickness of steel plate has less influence on bearing capacity of connectors. All models show similar load-slip trend and superior ductility. Finally, according to comparing and analyzing differences between calculated values from recommended formulas and measured values from tests, a new formula is deduced which can estimate the test results well. The standardization of push-out test needs further research so that Twin-PBL Shear Connectors can be widely used in project.
Pseudo-Spectral Domain Decomposition Method for the Dynamic Elastoplastic Torsion Problem
Authors: Ding Rui , Liu Lin , Li Wen Quan
Published: August 2013

Pseudo-spectral domain decomposition method (PS-DDM) is proposed for the dynamic elastoplastic torsion problem. Numerical examples illustrate the effectiveness of this method.
Dynamic Response and Internal Force of Partially Embedded Single Pile with Distributed Loads
Authors: Lv Hong Yong , Ren Qing
Published: August 2013

Dynamic characteristics of pile under distributed loads have aroused strong attention in the engineering field. Based on the Winkler beam model, transfer matrix method is used to build lateral vibration model for the partially embedded single pile with distributed loads. The method for solving pile deformation and internal force is shown. The influence to deformation and internal forces of partially embedded pile by load form is analyzed.
An Inverse Eigenvalue Problem for Spring-Mass Systems with Partial Mass Connected to the Ground
Authors: Tian Xia , Li Chuan Xiao
Published: August 2013

Consider the simply connected spring-mass system with partial mass connected to the ground. The inverse mode problem of constructing the physical elements of the system from two eigenpairs, the grounding spring stiffness and total mass of the system is considered. The necessary and sufficient conditions for constructing a physical realizable system with positive mass and stiffness elements are established. If these conditions are satisfied, the grounding spring-mass system may be constructed uniquely. The numerical methods and examples are given finally.
Numerical Study on the Static Response of Grouting-Sleeve Reinforcement-Connection Component under Axial Tension Load
Authors: Gu Fan , Wu Tao Gao , Zhao Wei Jian , Dui Xin
Published: August 2013

According to the actual structure of grouting sleeve, the ABAQUS finite element model of grouting-sleeve reinforcement-connection component under axial tension load was established, and the stress distribution at reinforcement, grouting material and sleeve were gotten. Numerical simulation shows that the compressive cones in grouting material are formed to transfer load between reinforcement and sleeve. Moreover, simulation indicates that mechanical property of grouting material is the most important factor for the physical reliability of reinforcement connection.
Application of 3D Laser Scanner in Surveying of Traditional Architecture: Case Study on Surveying Practice of Hangzhou Haichao Temple
Authors: Shen Li , Tai Hui Xin , Ni Tong Yuan
Published: August 2013

As a burgeoning survey approach, 3D laser scanning is currently more and more applied in traditional architecture survey. In the surveying practice for Tianwang Hall of Hangzhou Haichao Temple, by skillfully setting the targets, we efficiently and accurately collected relevant surveying data with 3D laser scanner. On this basis, utilizing jointed point clouds on inner and outer surface, we successfully obtained wall thickness, roof depth, and other data that could not be precisely captured through traditional surveying measures. Moreover, the width, height and size of main beams were also easily and accurately acquired. So far, 3D laser scanning has become a very effective measure in traditional architecture surveying.
Analyzing the Precision of Chebyshev Polynomial Fitting GPS Satellite Ephemeris
Authors: Xie Shao Feng , Zhang Peng Fei , Liu Li Long
Published: August 2013

Using Chebyshev polynomial to fit precise ephemeris of GPS, the nodes selection has a certain influence on the precision. In this paper we use 3 kinds of precise ephemeris ( IGF, IGR, IGU ) to analyze the difference precision of randomly selected interpolation node and Chebyshev points fitting orbit and compare the difference and precision of fitting orbit by 3 kinds of ephemeris and orbit provided by IGS. The result shows that using Chebyshev points to fit precise ephemeris, the precision of IGF and IGR can achieve mm levels, the precision of IGU can achieve cm levels.
Empirical Study on Farmland Qulity Grading of County Based on GIS
Authors: Jiao Xiao Li
Published: August 2013

Taking the Hedong District, Shandong Province as the example, based on the development situation of Hedong District, land change survey results database, the latest related data through field investigation, GIS and statistical software, the author chose natural environment factors and social economy factors, used the grading method to divide the farmland qulity grade after defining the weight and value of the factors. The results show that the national natural qulity grade of the farmland in Hedong District was diveded into the sixth grade to the eighth grade, the national practical grade was diveded into the sixth grade to the tenth grade, and the national economic grade was diveded into the ninth grade to the eleventh grade. It is proved that the grading results basically consistent with the actual situation and the method for farmland grading is efficient and reasonable. Therefore, it can provide reference for county farmland qulity grading.
Research on Geographic Information System of Natural Zoning for Highway
Authors: Li Chao , Wang Yu Lan , Xu Jin Liang
Published: August 2013

The natural zoning for highway cannot accurately reflect the relationship between the natural geographical factors and the highway engineering. The main reasons: study lacked basic data; spatial data analysis technique fell behind; index analysis mainly relied on the subjective experience; it was difficult to fully promote the application of the zoning results. The establishment of Geographic Information System of Natural Zoning for Highway (HZ-GIS) provides the powerful tools for the research work of highway zoning: realizes the seamless integration of GIS function platform and spatial database through spatial data engine, improves the storage and utilization efficiency of spatial data; carries on the quantitative analysis of zoning indices with the intelligent model running pool; establishes the zoning results release system based on Web Service, and realizes the network distribution of zoning results.
The Numerical Analysis of Suction Port Position under the Stress and Velocity Field
Authors: Li Dui Yuan , Wang Ping , Man Wei Long
Published: August 2013

The shaft drilling diameter is up to φ7m, Larger borehole and deepened section make slow drilling problem more and more prominent, which has seriously affected the drilling cost and drilling cycle, thus affecting the exploration and development speed of entire coal mine and the oil field. At present, the improvement of drilling speed and efficiency of φ7m and larger diameter section has become a technical problem needed to be solved. In order to improve the drilling speed of φ7m diameter and larger diameter boreholes, super twin-stage bit is recommended. It has an enlarger drill (φ 4.5m) than average bit using twin-stage structure.,A small guide hole is drilled the first, followed by drilling the borehole. On the other hand, the stratum drilled makes larger free surface to release the ground stress, which will increase ROP, reduce drilling time and quicken the speed of well completion.Starting from the mathematical model of stress field and velocity field, this paper establishes the unit models of bottom-hole stress field and velocity field. Through the finite element analysis, it analyzes influence of different slurry suction port position on rock breaking efficiency, which has high reference value for the design of super twin-stage drill bit.
Numerical Simulation and Analysis of NTP and Catalytic Reactor
Authors: Liu Jian Long , Chu Yu Hui , Wang Han Qing , Zhang Hai Ping
Published: August 2013

The author researches the conversion of NxOy and CxHy through a numerical simulation of the NTP and catalytic reactor, which contains the following factors: for instance the effect of flow, electrode diameter, reaction temperature, reaction time, voltage, frequency and electrode spacing, etc. The simulation results of NTP and catalytic reactor on the organic waste gas (NxOy and CxHy) reaches its optimum purification effect when the parameters are fixed as below: the flow is 5 l/s, the electrode diameter is 0.3 mm, the reaction temperature is 350 K, the reaction time (radial velocity) is 0.4 m/s,the voltage is 40 Kv, the frequency is 80 Hz.
Study on Effect of Resonance on the Motion of Floating Body
Authors: Zhu Lin Sen , Wang Yan Gang , Liu Yong
Published: August 2013

This paper aims to study the impact of resonance on floating body motion. According to Archimedes law, Newton's second law of motion and general form of simple harmonic oscillations, nature frequency is gotten in the numerical calculation. Then, the result is validated using four bodies with different weights in numerical calculation and finite element simulation.
3-Dimensional Digital Image Correlation for Strains Determination in Clayey Soil
Authors: Plé Olivier , Tourabi Ali , Abuaisha Murad S.
Published: August 2013

Landfills come with a cover barrier which includes a compacted clay liner essential to safety on site. Unfortunately differential settlement may cause stress in the clay layer leading to the development of cracks. This is why tensile stress damage and shearing are observed on the cap cover. Due to difficulties of strains determination in clayey soil during direct tensile tests a 3-dimensional digital image correlation is used. Two digital cameras are used at a constant distance from the sample tested. Pictures taken at preset intervals are post-processed to extract specimen strain and strain localization. The suitability of this method is discussed in regards of experimental results. This technique is particularly well adapted to the clayey soils when conventional measurements are impossible.
DDARF Analysis on Shear Tests of Jointed Rock Mass
Authors: Guo Shuai , Zhu Wei Shen , Li Yong , Jia Chao
Published: August 2013

Referring to the previous shearing model tests on intermittence jointed rock mass, DDARF method was adopted to conduct the corresponding numerical simulation. It could be concluded from the cracking failure phenomena that the results of the numerical simulation and the tests were in good agreement. Then the intermittence joints were arranged as en echelon and different cracking failure phenomena, peak shear strengths and strain-stress relationships were also obtained.
Main Problems and Solutions on Design and Construction of Qinghai-Tibet DC Transmission Project in Permafrost Region
Authors: Li Peng , Yu Qi Hao , Yan Fu Zhang , Huang Yuan Sheng , Cheng Dong Xing
Published: August 2013

The Qinghai-Tibet direct-current transmission project crosses the high-altitude permafrost region of the Qinghai-Tibet plateau. The permafrost foundation is characterized by being poor in thermal stability, rich in underground ice, very sensitive to climate warming, and strong in water-thermal activity. The foundation of the transmit electricity engineering therefore faces great challenges including tower foundation type selection and design, permafrost protection in the process of foundation construction and long-term stability. Based on an analysis of the geological engineering conditions and principal geological engineering problems of the project, a study is carried out on the design and construction problems of the transmission tower foundations in the permafrost region, the systematic analysis is also made regarding the main solutions to these problems with consideration of tower foundations long-term stability. This study will provide a theoretical basis and technical guide for design and construction of transmission lines in the permafrost region, and a reference for construction of transmission line projects in similar regions in China or even in the world.
An Experimental Study on the Dynamic Strength of Earth-Rock Aggregate
Authors: Qiang Yue , Wang Jin Cai , Chen Wei
Published: August 2013

This paper, based on dynamic triaxial apparatus of GDS, makes a consolidated undrained dynamic triaxial test of the saturated earth-rock aggregate of different earth-rock ratio, analyzes its processes and results, and preliminary discusses the influence of confining pressure, dynamic stress and earth-rock ratio on the dynamic strength of sandy pebble soil samples. Therefore, it providess some cognition of the study of earth-rock aggregate.