bluuebunny/crossref_metadata_2025 huggingface dataset:
Dynamic Analyses of a Self-Anchored Suspension Bridge under Seismic Excitations
Authors: Wang Cheng , Wang Yan Xu
Published: July 2014

The seismic response of the Wusong bridge was analyzed though the response spectrum method and the time-history method by adopting the MIDAS/CIVIL. The analysis results show that the longitudinal displacement of the main girder is much larger under longitudinal seismic input, so some inhibiting device or dampers should be used to avoid impacting. There is not coupling between longitudinal and lateral seismic excitations, while the seismic response of moment and shear force at the bottom of the main tower is much larger. On the contrary the seismic response of main beam and the main cable should be calculated under the longitudinal and vertical seismic excitations because of the coupling between the both of them. Furthermore, the artificial seismic wave fitting standard response spectrum was generated to conduct the time-history analysis and the results are much larger than the results from the response spectrum method.
Dynamic Response of Two-Dimensional Fluid-Saturated Porous Beam
Authors: Zhou Feng Xi , Ma Qiang
Published: July 2014

The dynamic response of the two dimensional fluid-saturated porous beam has been studied based on the linear elastic theory and the Biot’s model for saturated porous media, in which the compressibility of solid particles and fluid and the viscosity of pore fluid are taken into account. By adopting Fourier series expansion and solving ordinary differential equations, the calculation formula for dynamic response of a two dimensional simply-supported fluid-saturated porous beam is established. The dynamic response characteristics of the forced vibration under uniformly distributed harmonic load are analyzed as a numerical example. Moreover, the solid displacement and pore fluid pressure of the two-dimensional fluid-saturated porous beam would be affected by the surface in filtration conditions, pore fluid permeability coefficient and loading frequency parameters etc.
Numerical Analysis of Seismic Behavior of a Concealed Bracing Connection for Precast Concrete Shear Walls
Authors: Jin Qiao , Guo Wan Nan , Zhao Wei Jian , Zhang Bin , Zhang De Peng
Published: July 2014

Aiming at the horizontal connection joint of the precast shear wall structure, this paper presents a new-type horizontal wall-to-wall connection. Based on the ABAQUS finite element analysis platform, an accurate finite element model of shear connection joints was built. By quasi-static numerical tests, the seismic behavior of the proposed connection of the precast shear wall system was analysed and compared with that of the traditional cast-in-place connection. The numerical results show that the seismic performance of the presented connection, such as deformability and energy-dissipation capacity, is slightly lower than that of its cast-in-place counterpart.
Seismic Performance of Base-Isolation Building Subjected to Near-Fault Ground Motion with Velocity Pulse
Authors: He Qiu Mei , Li Ya Qi , Zhao Ya Min , Yang Yu
Published: July 2014

The seismic response of the base-isolated structure can be reduced significantly in the far-field region compared to the conventional seismic structure. However, near-fault ground motions with velocity pulse may cause the adverse influence on the seismic performance of the base-isolation building, which needs to be investigated deeply. In this paper 6 ground motions with velocity pulse are selected as the input, and the seismic response of a 9 layers conventional seismic RC frame building and comparative base-isolation building with lead-core rubber bearings are obtained by nonlinear time history analysis. The result indicates that base-isolation building with lead-core rubber bearings are of good aseismic performance under the near-fault ground motions with velocity pulse.
Process Simulation and Formation Mechanism of Shear Band in Soil
Authors: Hou Shi Wei , Qu Jin Hong , Zhang Yi Fang , Du Xiu Li
Published: July 2014

Shape multiformity and formation mechanism of shear band in normal consolidated soil were analyzed based on Modified Cam-Clay model under plane strain condition. The results proved that shear band forms because of impact action caused by strain energy releasing. End restraint and initial defect can induce and control the formation process and shape of shear band. The interaction of different boundary and initial defect settings was analyzed in order to obtain the mechanism and deformation process of shear band.
A Suggestion to the Vertical Earthquake Action Stipulated in Seismic Design Specification
Authors: Liu Hai Ming , Tao Xia Xin , Wang Jin Yuan
Published: July 2014

In order to further regulate the vertical earthquake action in seismic design specification, to overcome the unreasonable and inconvenient flaws in certain conditions by using vertical to horizontal spectra ratio function, the feasibility of stipulating vertical design response spectrum with the same way of horizontal one is deal with in this paper. 1513 sets of three component records during 64 earthquakes from NGA-west1 database are selected and grouped by magnitude, distance and site conditions. Average acceleration response spectrum of each group is generalized to get the corresponding mean maximum amplitude and effective peak acceleration EPA. Furthermore, some groups with EPA in an interval are merged into one. Once again, the parameters, such as maximum amplitude and characteristic periods of each final grouping are acquired by the same way. The former is divided by the corresponding horizontal value for site category, to obtain the site coefficient for vertical action. Finally a preliminary suggestion of vertical site coefficient and characteristic period are presented. Comparison of observed data with results from the new suggestion and those from spectral ratio shows that the improvement of this study is obvious.
Seismic Response Analysis for Assembled Precast Concrete Residence
Authors: Meng Zhao Bo , Cao Yu , Qiao Guan Dong , Zhao Yong Sheng
Published: July 2014

Assembled precast concrete structure is composed of precast element, which needs to be assembled and connected as the main force component. It is propitious to the development of building industrialization, enhancing production efficiency and promoting green building. Seismic response of a 6 storey assembled precast concrete residence was analyzed based on finite element software ANSYS. The results show that stiffness of assembled precast concrete residence is larger, and all of interbedded drift angles comply with stipulations of the standard.
Study of Ultimate Displacement of Timber Structures in Chinese Ancient Buildings
Authors: Xu Ming Gang , Ding Zhuo Wei
Published: July 2014

The available methods to determine the ultimate displacement of the building structures have been put forward, and the disadvantages of the methods are analyzed. According to the seismic design theory based on displacement of structures and reinforcement standard of Chinese ancient architecture, which refers to the modern structural engineering requirements, the ultimate displacement of the timber structure on Chinese ancient buildings, which is under the obvious P-∆ second-order effects, has been studied. The ultimate displacement and the drift ratio limit value of different axial compression ratio are determined by the experiments and Theoretical calculation. The results of the study of ultimate displacement can provide the technical support for the rehabilitation of the ancient timber buildings.
Research on Shaking Table Test of Base and Story Isolation Structures
Authors: Zheng Guo Chen , Xu Hang Li
Published: July 2014

The shaking table tests are conducted on a 5-floor steel frame model with a scale down of 1:6. The traditional anti-seismic structure and isolation structures with isolation layer in different position are adopted. The results indicate that the natural vibration periods of isolation structure are longer than anti-seismic structure, and when the isolation layer is located in a lower position, the period becomes longer and the damping effect is better.
A Two-Dimensional Numerical Model for Shallow Water Flows over Variable Topographies
Authors: Lv Biao , Li Shao Xi
Published: July 2014

Based on well-balanced Roe’s approximate Riemann solver, a numerical model is developed for the unsteady, two-dimensional, shallow water flow with variable topographies. In this model, an efficient methods are applied to treat the source terms and to satisfy the compatibility condition on unstructured grids. In the method, different components of the bed slope source term are considered separately and the compatible discretization of the components is presented. The newly developed model is verified against analytical solutions and measured date, with good agreement.
An Inversion Method of the Material Parameters for Gravity Dams
Authors: Zhang Dong Dong , Feng Xin , Zhou Jing
Published: July 2014

A regularization based method of inversely analyzing the material parameters for the gravity dams is presented in this paper. The measured noise of the displacement often leads to the ill-posed solutions of the dam inversion. A least square scheme was adopted for the inverse analysis by using of the displacement measurements, and the L-curve algorithm was proposed to perform the regularization in the inversion computation. The proposed method actually utilizes the sensitivity of the measured displacements with respect to the sub-regional material parameters. Thus a simplified algorithm was developed to calculate the sensitivity coefficients by using the standard finite element procedure. To investigate the effectiveness of the proposed method, the numerical simulations on a concrete gravity dam were carried out. The results demonstrate that the presented method can accurately obtain the material parameters of the dam by using of the inverse analysis, which has the potential for assessing the integrity of the gravity dams.
Analysis on Seepage Effects of Plastic Concrete Cut-Off Wall in Construction and Operation Period of Hydropower Station Tail Channel
Authors: Yan Guo Xin , Wu Wei
Published: July 2014

By numerical calculation, it analyzed the seepage effects of plastic concrete cut-off wall in in construction period. On construction period, the seepage flow from inside of channel to outside at unit length is 0.753m3/h. The seepage flow from under plastic concrete cut-off wall is 0.646m3/h which is 85.79% of total seepage flow. Under certain condition on operation period, the seepage flow from inside of channel to outside at unit length is 0.394m3/h. The seepage flow from under plastic concrete cut-off wall is 0.358m3/h which is 90.86% of total seepage flow. Under another condition on operation period, the seepage flow from inside of channel to outside at unit length is 0.249m3/h. The seepage flow from under plastic concrete cut-off wall is 0.236m3/h which is 94.78% of total seepage flow. In It showed the plastic concrete cut-off wall has obvious effect.
Application of MIKESHE Model in Water Environmental Management for Guishui River Basin
Authors: Zheng Zhen , Zhang Jing , Gong Hui Li , Huang J. W
Published: July 2014

In order to comprehensively analyse hydrological environment system of watershed, it is particularly important to couple the surface water and groundwater for better underding the entire hydrologic cycle. Guishui river basin, located in Beijing, was selected as the research area to build a MIKE SHE hydrological integrated model to simulate the surface runoff. The hydrologic response in the Guishui river basin was explored. This study will enrich the experience of the domestic application about MIKESHE model and provided scientific basis for regional water resources planning and management. In the paper, the development process and present research situation of integrated hydrological models were overviewed, concluding the principle of model structure. Considering the water environment issues in the study area (such as water pollution, water resource utilization, watershed underlying surface, climate change, etc.), the integrated hydrological model was setup based on MIKESHE for the simulation year of 2005 to 2010. The preliminary results showed that it is feasibile to apply the MIKESHE model in the study area for water environmental management. Furthermore, some valued suggestions and perspectives about the water environmental problems in the study for the future were provided.
Design of a Pressurized Trapezoidal Shaped Conduit Using the Rough Model Method (Part 2)
Authors: Achour Bachir , Bedjaoui Ali
Published: July 2014

Through the Rough Model Method (RMM) an explicit calculation is proposed to solve the complex problem of the design of a pressurized trapezoidal shaped conduit characterized by three linear dimensions. Firstly, the method is applied to a rough model of the same shape in order to establish the equations governing its geometric and hydraulic characteristics. These equations are then secondly used to easily deduce the required linear dimensions of the current conduit by introducing a non-dimensional correction factor. The application of the obtained relationships requires only a strict minimum of data. All relationships provided in this article are applicable to the entire domain of the turbulent flow. Practical examples are taken to enable the hydraulic engineer to better understanding the advocated method and to observe the facility with which design of such a geometric profile can be performed.
Research and Discussion of Impervious Wall Construction Based on Continuous Vertical Slotting Technology
Authors: Zhang Li Xin , Li Yong , Zhang Zhao , Niu Jing Tao , Yu Hai Yang
Published: July 2014

Continuous vertical slotting technology is used in underground excavation, where the underground slots are separated into several sections taking advantage of the elasticity and flexibility of gasbags to construct flexible and rigid underground continuous impervious walls with different materials.
Experimental Study on the Air-Cooling of Concrete Aggregate
Authors: Zeng Miao , Guo Chao Hong , Kang Zhi Ming , Guan Wei , Lu Fei , Wang Gang , Tang Da Wei
Published: July 2014

The temperature distribution and the flow resistance of air-cooled concrete aggregate are investigated in order to provide engineering guidance for the energy economization and design optimization. First, an aggregate bin is down-scaled and installed on an indoor experiment table, then tests are performed for different aggregate sizes and different inlet air velocity, with or without upper air duct. The results show that with the decrease of aggregate size, the temperature distribution turns more uniform, but the flow resistance increases; with the increase of wind velocity, the cooling rate is enhanced, but meanwhile the flow resistance is increased. So for different size of aggregates, an optimal wind velocity exists. Having an upper air duct not only enhances the cooling rate but also increases the cooling uniformity.
Shape Optimization for Arch Dam with Sequential Quadratic Programming Method
Authors: Duan Yin , Yuan Wei , Liu Hui Bo
Published: July 2014

The sequential quadratic programming method is introduced in arch dam shape optimization design. In the optimization computation, the arch dam volume is taken as objective function, and the calculation is realized by automatically considering loading process, equivalent stress computation and simulation of shape optimization for arch dam based on FEM. A parabola arch dam is used as a numerical example. The result shows that the optimized figure is much safer and more practical, which indicates that the SQP method is an effective way for optimization design of arch dam shape.
Unsteady Flow Impact on Downstream Waterways and Control Measures Research of Pingban Hub in Nanpanjiangjiang River of Guizhou
Authors: Liu Xin
Published: July 2014

After the completion of the hub on river, its scheduling unsteady flow generated an adverse impact on the downstream navigation. In this paper, according to the unsteady flow data of PingBan hub in Nanpanjiangjiang River in Guizhou province, researched unsteady flow spread characteristics and rule in hub downstream channel. Studies have shown that: unlike general water level changes in hub downstream, the waterlevel amplitude attenuation along is not obvious in researched reach; Clear the concept of unsteady flow additional velocity、additional slope,through this theory reveals the ship ascending rapids mechanism difficultly under unsteady flow condition. On this basis, proposed channel regulation methods and measures in hub downstream, which provided support for the hub downstream channel regulation.
Finite Element Analysis of Seismic Response of Exposed Steel Penstock in Hydropower Station
Authors: Liu Yuan , Shi Chang Zheng , Wu He Gao
Published: July 2014

Using finite element method, the seismic responses of an exposed steel penstock in a hydropower station were analyzed. The results show that the penstock is constrained weakly due to the expansion joint and sliding supports, so the penstock can adapt to the deformation during the earthquake well, and the stress caused by the earthquake is small which will be benefit for the strength and safety of the penstock. However large acceleration and displacement in transverse direction may be induced under strong earthquake, in addition, the penstock will be likely to jump apart from supports in vertical direction. So it is better to equip caging device to limit transverse sliding and vertical jumping in an appropriate range in order to ensure the safety and stability of the whole structure.
Analysis of Monitoring and Settlement Prediction of Wenzhou Shoal Seawall
Authors: Wei Hai Yun , Liang Guo Qian , Zhang Chao Jie
Published: July 2014

The foundation of Wenzhou shoal project is soft and deep. The stability control issue of building seawalls on the deep soft foundation was solved by using a composite foundation treatment of plastic drainage plates and geotextile, combining with the in-situ monitoring. The in-situ monitoring data of Wenzhou shoal project was analyzed and the settlement prediction analysis was conducted. Basing on the conventional exponential curve fitting method, the settlement prediction model is presented for the classified construction on soft foundation. Considering the non-linear of deformation and soil consolidation with load changes, the model used the settlement deformation characteristics under the last load to predict the settlement development under the next load.
Monthly Rainfall Analysis in West Part of Chongqing
Authors: Qin Lin , Jin Jun Ying , Zhang Qian , Wang Da Ke
Published: July 2014

Rainfall information is critical in understanding the hydrologic balance on a global scale and the complex interactions among the small-and large-scale components within the hydrologic cycle [1]. In this study, the monthly rainfall data from 1976 to 2006 at the stations of Rongchang, Dazu, Tongliang and Yongchuan were used to analyze the statistical characteristics and trends of rainfall changes in the west of Chongqing. The average monthly rainfall at Rongchang, Dazu, Tongliang and Yongchuan were 89.4mm, 83.5mm, 88.3mm and 84.8mm in thirty years. The probability distribution of rainfall is a normal distribution. Moreover, the histogram of frequencies showed a clear tendency toward a obvious seasonality of the rainfall distribution [2].
Precipitation Characteristics and Trend in the Hsiao-Ching River Basin of Jinan City during the Past 50 Years
Authors: Lin Lin , Liu Jian , Huang Ji Wen , Chen Xue Qun , Guan Qing Hua , Tang Yi
Published: July 2014

Monthly precipitation data from Huangtai Bridge Station were used to study seasonal and annual precipitation characteristics and trend. The covered time-period is from 1956 to 2007. Different methods including linear regression, 5-year moving average, anomalies in decadal scale and the Mann-Kendall test were applied in the study. Nearly two-thirds of the total rainfall amount is concentrated in summer, with autumn and spring months to follow, and only about 3% in winter. An increasing trend in spring months is found. It starts in 1978, becomes significant after 2002, and probably continues into the future. A decreasing trend is recorded in winter and begins in 1980. No significant trend is found in summer, autumn and yearly precipitation. The same fluctuations are observed between summer and annual precipitation indicating the dominant influence of the summer season.
Research on Structure Design of U Type Canal of Seepage-Proofing
Authors: Sun Jing Lu , Zhang Bin , Zhang Shou Jie
Published: July 2014

New U (moment) implements the optimum water section of rectangular slot structure, besides all advantages of the traditional U and T-shaped slot in the canal seepage, also has advantages of reducing covers area of higher performance and price ratio. The kind of canal seepage control structure is upgrading products of the traditional U and T-shaped slot. In this paper, through design research on new U (moment) slot structure, giving U (moment) slot structure size, it can provide technical support for the product development of new type U (moment).
Data Mining Model in Regional Target Decomposition of Water Resources Utilization Efficiency
Authors: Chen Hua Wei , Huang Ji Wen , Li Bing , Fu Shi Dong , Zhang Xin
Published: July 2014

Data mining model is the most important technical basis of the control target decomposition for the most stringent water resources management of Shandong province. K-means clustering model is adopted to analysis the water withdrawal of industrial added value per ten thousand yuan in 2010. Based on the yearly industrial water consumption trend from 1995 to 2010 of 17 municipal-level cities in Shandong province, the ARIMA (p, d, q) model is established through a lot of fitting and optimization and then the regional industrial water demand and water utilization efficiency in 2015 were forecasted. According to the proposed principal and technical route of target decomposition, the industrial water utilization efficiency target in 2015 of the whole province and 17 municipal-level cities are defined respectively.
Experimental Investigation on the Segregation of Landslide Dam Materials
Authors: Zhang Ming , Wang Fei , Mouse Gu Jie , Luo Wei Tao , Zhang Hong Wu , Liu Yao Ru
Published: July 2014

Large landslides usually dam lakes that may easily fail and then result in catastrophic flood threatening the population downstream. The grain size composition within landslide dams is considered as a vital factor that impacts the timing of failure and the resulting magnitude of flood. Therefore, experiments were conducted to investigate the features of size distribution in accumulation bodies. The results indicate that the grain size distribution varies in different parts of the deposits. The inverse grading phenomenon can be observed. Grains in the front of the deposit are coarser, while grains in the rear are finer. For the front of the deposit, the grains in the middle are finer than the other two sides. The grain size segregation is believed to be the governing mechanism that contributes to this special distribution. The speculations of the grain size distribution inside the landslide dam are presented.
The Microstructure Formation Process Research in Loading Condition of Dredger Fill
Authors: Wang Jia , Cai Peng Lin
Published: July 2014

This paper takes some sections of Tianjin coast for example, explore the microstructure morphology and index-load combination in the condition of different settling time with load combination about reclaimed soil on the basis of sampling and testing of original state reclaimed soil. Including apparent form, size, directionality gap , formation of the skeleton and bulk density changes of the flocculation body aggregate. It found the characteristics and regularities of microstructure of reclaimed soil in the initial settlement. The research claims the structure of reclaimed soil is enhanced and the change of soil microstructure has positive significance to the engineering geological properties. in the process of consolidation Keyword: reclaimed soil; microstructure; Consolidation settlement
The Research of Flow Resistance Property in the Tugging and Mooring of Tube Segment
Authors: Qiu Zheng Zhong , Dong Min
Published: July 2014

The tube tugging and mooring is the key step in the process of the immersed tunnel, and the most important theoretical is the calculation of water flow force. According to the numerical simulation and physical model of the tube in the Pearl River, the difference value of the flow resistance coefficient can be calculated. The fluent software is used to simulate the process of the tube tugging and mooring. On the basis of the empirical data of the tube experiment in the Pearl River, the flow resistance coefficient is obtained in the process of the tube tugging.
Tieshan Port Development Plan: Evaluation of the Long Wave Induced Resonance Using a Numerical Mild-Slope Model
Authors: Zhao Hong Jun , Yang Jie , Chen Guo Ping
Published: July 2014

The general development plan of Tieshan port is designed to be long and narrow, for which the long wave induced resonance may be problematic. Within the present work, a numerical study on the effects of this kind of resonance is conducted. The simulations are performed with the use of the mild-slope model developed in Ref. [1], which was further validated in the present work to be able to predict reasonable results for the harbor resonance. To evaluate the wave resonance for the plan of Tieshan port, 71 offshore wave conditions with the period ranging from 50s to 400s have been calculated. The rationalities of the numerical solutions are analyzed through comparisons with the theoretical ones, and the general agreement is seen to be reasonable. Some preliminary results for the harbor resonant modes, the resonant periods and the corresponding amplification factors for the plan of Tieshan port have been presented.
Computation and Analysis of Buttressed Quay’s Floor
Authors: Ning Qing Chen , Yang Xu , Shi Yan , Li Lun
Published: July 2014

In the design and construction code for gravity quay, the inner floor of multi-ribbed buttressed quays generally is divided into two parts to calculate. The part within 1.5 times the rib spacing is as a three fixed edges and one simply-supported slab. The restriction effect of the three fixed edges is the same. However, because of the difference in thickness between vertical plate and rib with the change in the vertical direction of the flow, the effect of them is not the same. It will lead to the result deviating. Sometimes, there will be a phenomenon that the maximum bending moment of inner floor is smaller than the mid-span moment. Finite element software ANSYS was used to make a 3D numerical simulation on a buttressed quay in this paper. Shortcomings in the current code are addressed by comparing the calculation results. This can provide references for engineering design.
The Research on Mean Spacing of Rock Fracture
Authors: Jiang Lu , Zhang Yang Song
Published: July 2014

The mean spacing of rock fracture is a very important parameter base to evaluate rock mass,a number of rock studies base on it. Object of this paper is Beishan preselected area in Gansu Province, China. A uthor use GPS-RTK to measure the fracture’s endpoints and inflection, then process the resulting coordinate, building a three-dimensional model of rock fracture by using three-dimensional software and meshing the three-dimensional model, Through the analysis of fractures in each grid to calculate the linear density of rock fracture, after the orientation and inclination correction on linear density, it can be converted to an mean spacing of rock fractures. The mean spacing of rock fracture can be directly used for rock mass classification in GSI rock systems, and has a great significance in rock engineering studies.
Study on the Evolution of Artificial Beach in Xiamen
Authors: Wang Guang Lu
Published: July 2014

Taking Xiamen Xiangshan-changweijiao beach project as an example, study the technology of beach restoration. Xiangshan-changweijiao beach locates at the SE of Xiamen Island, which has already been eroded out. The restoration project was finished by the first step and the beach showed better performance than history after one year evolution. By analyzing the environment of shore, designing beach factors, technology of beach fill placement, study the beach restoration and evolution of artificial beach, inquiry the theory of beach nourishment in China.
Three Dimensional Physical Model Study on Penang Fishing Port Project
Authors: Zhang Ci Heng , Geng Bao Lei
Published: July 2014

A three-dimensional physical model was used to study the wave distribution around breakwater in Malaysia Penang. Model tests were carried out by using the L-type action absorption directional wave generator in a 45m×40m wave basin at TIWTE in Tianjin China. The incident wave conditions were checked first in the laboratory and a series steps were introduced to construct the bathymetry and breakwater structure. By comparing the test results, the improved top elevation of breakwater is +4.5m, and the recommendation length of northern part of breakwater is 65m.
Study on the Panel of the High-Pile Wharf Near Estuary Based on the Finite Element Method
Authors: Yang Xu , Ning Qing Chen , Shi Yan , Xia Gao Xiang
Published: July 2014

The high-pile wharf near estuary under wave subjects to great wave force. The wave force can cause destruction of the wharf superstructure. Current research focuses on the case where the forward direction of the wave is perpendicular to or inclined to the wharf front line and mostly applied physics modelling experiments. This paper is to study the case where the wave is parallel to the front line of the high-pile wharf. Take a high-pile wharf near estuary as a model and use the finite element software Ansys to establish the space model. Analysis of internal forces and the destruction of high-pile wharf are made. Meanwhile, the preliminary solution depending on the destruction are proposed, providing references for projects.
Complementary Use of Inductive Test and Bending Test for the Characterization of SFRC
Authors: Liao Lin , Cavalaro Sergio , de la Fuente Albert , Aguado Antonio
Published: July 2014

Many researches have been conducted in past decades for promoting the application of steel fibre reinforced concrete (SFRC), either conventional or self-compacting. However, the differences of post-crack behaviour and the properties of these two types of concrete remains unclear. The objective of this paper is to analyse such differences in terms of flexural behaviour, fibre orientation and contribution as well as the fibre content. For that, an extensive experimental campaign was carried out. In total 3 mixes of self-compacting and 3 mixes with traditional concrete were produced with the nominal fibre contents of 30kg/m3, 45kg/m3 and 60kg/m3. In each series, specimens were produces and characterized by three point bending test (code EN 14651) and inductive test. The results illustrate how fibre orientation and distribution justify the differences in the mechanical behaviour of the materials and the scatter of the bending test results.
The Research Review of Underground Continuous Wall on Deformation Characteristic
Authors: Zhang Shi Min , Yuan Teng Kun , Zhou Yang Kai , Li Deng Hui , Zhuo Kai Hang
Published: July 2014

Underground continuous wall has received more and more attention in the construction field as the important part in the foundation engineering. Pointing at the deformation characteristic of continuous wall, the factors which influent the deformation of continuous including the intrinsic mechanical characteristic and time effect in the construction area. The main calculation methods and various of calculation models are concluded as well as the construction technology, which concludes the research production in the continuous wall field and pointing the direction for the following research.
Causes and Solutions for the Common Problems in Rotary Drilling Cast-in-Place Pile Construction
Authors: Zhou Zhao Yin , Zhang Chang You
Published: July 2014

Quality control in the rotary drilling cast-in-place pile construction is of great difficulty. Once a quality problem occurs, it would have an impact on the quality of the whole project. The text mainly analyzes the causes for the common problems in rotary drilling cast-in-place pile onstruction and gives some corresponding measures to solve them combined with engineering cases.
Connecting Passage Construction for the Foundation Pit under Existing Optical Fiber Cable
Authors: Cao Han Qing , Lou Nan , Cui Wei Jiu
Published: July 2014

Puli center project protects the original soil with pipe roof technology through combining the field analysis and finite element modeling while constructing the connecting passage of foundation pit under the existing optical fiber cable, so as to avoid the optical fiber cable from producing too big settlement to cause the adverse effect, and then constructs the connecting passage of foundation pit. After field monitoring, the maximum settlement of pipeline conforms to the deformation control standard of optical fiber cable, and this technology has certain innovation, which can provide reference for the similar project.
The Double-Layer Nonstationary Heat Conduction Measures to Prevent the Formation Ice-Dams on the Roof
Authors: Petrichenko Mikhail , Nemova Darya Viktorovna , Tarasova Darya Sergeevna , Staritcyna Anastasiia Andreevna
Published: July 2014

The following article deals with the problem of icicles formation on the roofs and the elimination methods. The attic roofs with pitched roofing are highly susceptible to this negative phenomenon.
In work warming of garret overlappings as a method of prevention of formation ice-dams on roofs of buildings in the operation, being characterized is in detail considered by the lowest temperatures of external air.
The Rheological Properties and Yield Stress Model of High-Density Slurry Added with Coarse Sands
Authors: Zhang Xiu Xiang , Qiao Deng Pan
Published: July 2014

In order to determine the concentration range of high-density slurry with coarse sands for suiting pipeline transportation in Jinchuan mine, at the same time find a suitable model to predict yield stress. In this paper, based on the coarse sand of Jinchuan mine as material to prepare high-density slurry, studied on the rheological properties. Through two-factor variance analysis, qualitative and ration analysis of the effect was conducted on the cement content and mass concentration to rheological parameters. The results show that the rheological model of the coarse sand is similar to that of Bingham plastic fluid, the mass concentration has a significant effect on viscosity and yield stress, and the viscosity is significantly affected by the cement content. The mass concentration of 82%-84% is suitable gravity transportation in pipeline. Meanwhile the relation model is established between yield stress and water-cement ratio, aggregate volume concentration, the model has high precision. These provide technical basis for designing filling system and ensuring the stability of slurry transportation, and a new idea for the research of rheological properties.
Research on the Characteristics and Status of Recycled Concrete Filled Steel Tube
Authors: Wang Bing , Liu Xiao , Yu Xiao
Published: July 2014

Utilization of waste concrete has a great significance for environmental protection; concrete filled steel tube is a way of utilization of waste concrete. At the same time, the recycled concrete on the center tube has a "hoop" function, can compensate for the deviation of mechanical properties of recycled aggregate concrete. This paper introduces the characteristics of steel recycled concrete, and introduces the research status of domestic experts and scholars on it, based on the above; the future application of the recycled concrete in steel pipe is presented.
Processing Status and Utilization of Construction Waste in China and the West
Authors: Liu Feng Jun , Suo Fei Fei
Published: July 2014

With the rapid development of economy and urbanization, more and more construction waste is produced. The construction waste consumes lots of space and pollutes the environment. Therefore,how to deal with it well is attracted more and more attention and research. The legal system and the treatment processes for construction waste resource utilization between china and the west are compared. Furthermore, considering the fact that a few deficiencies appear in construction waste resource utilization in china, some pertinent suggestions are put forward.
Effects of Different Irrigation Amount on Yield and Quality of Greenhouse Tomatoes
Authors: Chen Zhuang , Abdalhi Mohmed Abdallah Mohmed
Published: July 2014

In order to determine the proper irrigation amount of summer tomatoes,taking drip irrigation in green house,5 irrigation volume including 990 m3/hm2、1485 m3/hm2、1980 m3/hm2(CK)、2475 m3/hm2、2970 m3/hm2were set,and the effects of different irrigation amount on the yield and quality of tomato in greenhouse were studied. The results showed that with the increase of irrigation amount,the soluble solid content,titratable acid content,Vc content and irrigation water use efficiency of tomato decreased. In treatment T1, T4, T5 ,yield decreased by 26.3%, 6.5%, 15.8%. In treatment T2 , the yield decreased by 1.9%,while the irrigation water use efficiency increased by 20.8%,and the soluble solids content,titratable acid content and Vc content increased.It is concluded that the optimum irrigation amount is 1485 m3/hm2.
Research on UV/TiO2 Photocatalytic Oxidation of Organic Matter in Drinking Water and its Influencing Factors
Authors: Zhao Jin Hui
Published: July 2014

UV/TiO2 photocatalytic of filtrated water are conducted in S waterworks which take Yangtze River as its source water in Nanjing. Self-made glass supported nano-TiO2 film and photocatalytic reactor are used for the experiment. Results show that TOC removal efficiency can reached 45% -63% within 2h-3h, Organic matter removal efficiency is positively related with the • OH generated in photocatalytic process. The influence factors on TOC removal efficiency follows the sequence: light intensity, dissloved oxygen, reaction time and pH. Changes of UV absorption characteristics in photocatalytic process indicate that the saturation of organic matter increase significantly, this is conductive to control the risk taken by disinfection by-products. Results proved that UV/TiO2photocatalytic is a promising technology for the removal of organic pollutants in drinking water, it can improved the chemical safety of drinking water.
The Development of Prestressed Concrete Cylinder Pipe in China
Authors: Zhang Hong Yu , Peng Hua , Chen Xiang
Published: July 2014

Prestressed Concrete Cylinder Pipe (PCCP) consists of a steel cylinder lined with concrete, then helically wrapped with a wire and coated with a dense mortar. PCCP has excellent structural properties, so it is widely used in various water-transportation projects around world. This paper presents a review of development of PCCP in China, which was summarized as three stages: the period of exploratory development, the period of cooperativedevelopment, and the period of independent development. The development process of design and production technique, the application in China, the construction and development prospect of PCCP were made a detailed discussion in each stage.
Study on the Treatment of Compound Micro-Polluted Groundwater by Contact Oxidation Process under Different Filtration Rates
Authors: Zhao Yu Hua , Cheng Jie , Yan Xu , Wang Di
Published: July 2014

The compound micro-polluted groundwater was treated by three-stage contact oxidation filters with total 1.5m ceramic layer. The filtration rates, in accordance with the time sequence, were respectively 1m/h, 1.5m/h, 2m/h, 3m/h and 4m/h. The result indicated that, in the condition of sufficient dissolved oxygen, the effluent concentration of iron, manganese, ammonia nitrogen and CODMn can met the National Drinking Water Standards. Under the range of filtration rates the average effluent concentration was respectively that 0.073 mg/L, 0.278 mg/L, 0.229 mg/L, 0.172 mg/L and 0.199mg/L for iron; 0.150 mg/L, 0.180 mg/L, 0.110 mg/L, 0.150 mg/L and 0.359 mg/L for ammonia nitrogen. The average concentration of manganese was 1.828mg/L with dropping aeration only, compare with that 0.323mg/L with strengthening aeration under filtration rate 1m/h. And the manganese concentration was 0.061mg/L, 0.062 mg/L, 0.084 mg/L and 0.071 mg/L, respectively under the range of filtration rates of 1.5-4m/h by strengthening aeration. Because of the biological system in filter layer no perfect, humic acid and low temperature, the average removal rate of CODMn was only 16.10% under the 1m/h filtration rate. Then when the rates were up to 1.5m/h-3m/h, effect of CODMn removal increased and the water treated met the Standard with the maturity of filter layer. But under the rate 4m/h CODMn concentration of effluent was exceed the Standard. Meanwhile, in the range of 1m/h-3m/h, consumption of dissolved oxygen respectively were 19.26mg/L, 14.73mg/L, 13.99mg/L and 13.99mg/L.
Treatment of Raw Water in Yangtze Chenhang Reservoir by Diatomaceous Earth Precoat Filtration
Authors: Zhou Wen Qi , Zhang Dong , Ye Hui , Wang Zheng , Yang Zheng , Zhang Chun Lin
Published: July 2014

Taking the raw water of Yangtze Chenhang Reservoir as the research object, the characterization of diatomaceous earth, and the removal efficiency of CODMn, turbidity by precoat filtration process were investigated by pilot experiment in this paper. The results showed that diatomaceous earth patterns having porous structure and the pure silica peak at 2θ angles 21.980, 36.080, 31.460 and 28.430 in XRD analysis. Precoat filtration has a good stability to remove solid suspended particle, effluent turbidity was remained about 0.05NTU. Precoat filtration had no effect on removing CODMn. The pressure of 50KPa could be defined as a critical point in this experiment. Beyond the critical point, the devices should be stop and backwash, to resume operation pressure. Overall, precoat filtration can be defined as a filtration technique for relatively low turbidity raw waters.
Simulation and Analysis of Thermal Performance of Internal Recycle Double Skin Facades
Authors: Hui Cun , Wang Yuan Qing , Wang Bin , Tao Wei , Zheng Sheng Lin
Published: July 2014

Simulation and analysis of heat transfer process in internal recycle double skin facades (DSF) of the established standard model were carried out by computational fluid dynamics (CFD). Comprehensive heat transfer coefficient under the condition of different ventilation rate of DSF with and without blinds was studied. The results show: the increase of the ventilation rate can not only improve the comprehensive heat transfer coefficient, but also improve the temperature of inner surface of the inner curtain wall. Double skin facades can improve the comfort level of the indoor environment, reduce the energy loss of the palisade structure and reduce energy consumption.
A General Criterion for Complex Rocks and Soils and its Application
Authors: Ruan Huai Ning , Luo Man Lu , Wang Di , Ju J. W.
Published: July 2014

A failure criterion is proposed for complex rocks and soils. Their anisotropic and nonlinear behavior is analyzed theoretically and experimentally. The influence of the intermediate principal stress is taken into account. The nonhomogeneous strength and the effect of geological temperature are also discussed. Many classical failure criteria are special cases of the proposed condition. The criterion is applied in the analysis of the bedrock of Ankang Dam in China. The case study illustrates the potential of the proposed general model in engineering application.
Calculation and Analysis of Gravity Head Coefficient in Hot Water Heating System
Authors: Xie Wen Wen , Fu Yong Zheng
Published: July 2014

This paper presented a method of mathematical expectation to calculate gravity head coefficient, and this method was applied to calculate the value of gravity head coefficient of some selected cities in China in different operation regulation mode and different design supply and return water temperature. The results show that gravity head coefficient calculated by this method reflects the average value during the whole heating period. It has more representative significance. When the temperature of design supply and return water in heating system is reduced, the gravity head coefficients change very little. In different operation regulation modes, the gravity head coefficients change larger. The gravity head coefficients have a certain difference in different areas.
Study on the Current Situation of Economic Analysis of Ice Storage Air-Conditioning System
Authors: Li Yu Na , Wang Si Fu , Lv Tu Zhai , Lang Shao Fei
Published: July 2014

Ice storage air-conditioning system has incomparable advantages than a lot of of conventional air-conditioning system example for "peak shifting and valley filling". The ice storage air-conditioning systems on the research states of the economic analysis are summed up from the building of economic analysis model,the introduction of the special systems , as well as the impact of economic factors in this paper. This paper outlines several main methods about economic evaluation of the ice storage air-conditioning systems,points out some issumes in the course of the study and some places needing to improve.
Effect of the Circulation Flow Velocity in Ground Heat Exchangers on System Operation
Authors: Qi Zi Shu , Gao Qing , Liu Yan , Gao Zhen Hai , Bai Li
Published: July 2014

The heat pump system by using earth energy is increasing very rapidly. In this paper, by studying the underground heat exchanger heat transfer mode, the computing platform for ground source heat pump system was established. Through a engineering case, the influence character of the circulation flow velocity in ground heat exchangers on the fluid temperature, the heat pump power consumption, and the length of system were analyzed, which provide an approach for system engineering design and operation prediction, and for the thermodynamic analysis of performance of system year by year and prospective study to guide the engineering practice.
Energy Saving Design of a Training Center in Dongguan
Authors: Lai Xue Jiang , Du Zhi Heng , Zhang Zhen Qin
Published: July 2014

A training center design as an example, the impact of building energy-saving design on building energy consumption are showed. Energy-saving design options of air conditioning system and refrigerator are given. Lighting power density of the lighting system energy-saving design and the project of energy-saving design are provided.
The Effectiveness of Implementing Automated Ventilation System in Premises Intended for Public Using
Authors: Shilkina Svetlana , Trusov Artur
Published: July 2014

One of the most important topic of 21th century is energy savings, and many countries create enterprises which develop standards and codes for construction, repairs and building renovations, including a realistic, cost-effective recommendation aimed at making city buildings become cleaner and more energy efficient. For example, one of these enterprises is C 40 Cities Climate Leadership Group.