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January 30,2010
Volume 3,Issue 2
Pages 109-209
Subject Area:Flood Control Project,Environmental Water Conservancy,Construction Economics,Basic Subject of Civil and Architectural Engineering, Engineering Mathematics, Engineering Mechanics,Heating and Gas Supply Engineering,Civil and Architectural Engineering Construction,Engineering Structures,Civil Construction Structure

Title: Development and application of Danjiangkou reservoir operation automatic system

Authors: HU Yongguang, DONG Fuqiang, HE Yousheng
PP: 204～209
Abstract: This paper introduces development content of Danjiangkou reservoir operation automatic system: Reservoir operation system is an important part of power dispatching automation and a powerful support for creating comprehensive benefit of the reservoir. This system can carry out monitor, forecast, operation and management of related reservoir running. This system can collect hydrological, meteorological and reservoir running information automaticly and make real-time flood forecasting, flood regulating calculation, optimal operation and reservoir integrated management based on historical data and database management technology. So this system can provide reservoir operation decision scheme to meet demand of flood control, power generation, irrigation and other comprehensive utilization. The paper briefly analyzes benefits of the system. The application of this system bring social and economic benefits, and this system is a non-engineering measure which is worth generalization.
Keywords: flood-prevention project; reservoir operation automatic system; development; benefit; non-engineering measure

Title: Brief analysis on soil moisture content change discipline of Cangzhou city

Authors: LI Chunguang, HA Jianqiang
PP: 196～203
Abstract: Based on the monitoring data of 2003~2006 in Jiedi drought experimental station, the paper thoroughly analyzes the soil moisture content characteristics, and studies the soil moisture content change discipline of the area (Binhai plain area) represented by the Jiedi drought experimental station. The paper used observed data to analyze and calculate the values of soil depletion coefficient k, and monthly average k, and establishes a soil moisture depletion forecast scheme. A correlation diagram of rainfall amount P~soil moisture content before rain θ0~soil moisture increase after rain Δθ was made to obtain a empirical formula of soil moisture increase calculation, so as to establish a soil moisture increase forecast scheme. The two plans were assessed, and the results showed that their accuracy could meet the requirement of forecasting the soil moisture content. This soil moisture content forecast scheme has vital significance for reasonably directing crop irrigation, developing agriculture with high quality, high production and high effect, reasonably using water resource, and maintaining continues the steady development of agricultural production.
Keywords: environmental bydraulics; soil moisture content forecast; soil depletion coefficient k; rainfall amount P; soil moisture content before rain θ0; soil moisture increase after rain Δθ

Title: Design features of quick multi-leaf gate in Taipu River pumping station

Authors: XIE Lisheng
PP: 191～195
Abstract: Firstly, this paper illustrates the selection of the direct lifting quick multi-leaf flap gate as the interception measure of outlet flow mode in Taipu River pumping station. After that, this paper introduces the design features of quick multi-leaf flap gate, including the determination of head loss for the flap gate, the calculation of the opening angle and impact force, and the design of the door hinge. Finally, this paper discusses several points to ensure the reliability of interception for quick multi-leaf flap gate.
Keywords: hydro-structure; pumping station; interception measures; quick multi-leaf flap gate; design features

Title: Advances in the application of geographic information system in hydrology and water environment simulations

Authors: LUO Wenbing, HONG Lin
PP: 186～190
Abstract: On the basis of a brief introduction to the geographic information system (GIS), this paper introduces the application of GIS in surface water and groundwater hydrological simulations, and water environmental simulations, especially non-point source pollution. It also points out the deficits and problems existing in the application of GIS in hydrology and water environment, and previews the development direction of the application of GIS. The results show that with the development of computer sciences and information technologies, GIS can play a more and more important role in hydrology and water environment simulations, especially in the non-point source pollution simulations.
Keywords: geographic information system; simulation; reviews; hydrology; water environment; application

Title: Investigation and reflection on the asphalt pavement damage of Fuxin city

Authors: LIU Jiashun, ZHANG Xiangdong
PP: 180～185
Abstract: In order to summarize and analyze causes of asphalt pavement damage, through data collection and field survey, the paper generalizes various phenomena and analyzes the causes of broken roads, which mainly include frost boiling, road holes, road-cracking as well as track channel destruction, etc. This thesis analyzes the causes of broken roads mainly in terms of natural elements, application management, construction management and social influence. The results show that scientific management and reasonable use play an important role in preventing roads from damage besides designing and construction elements.
Keywords: civil and architectural engineering and other subjects; asphalt road; road damage; frost boiling; damaging causes; construction; management

Title: Based on the critical chain to control the construction progress

Authors: LU Yang, TAN Dalu
PP: 176～179
Abstract: The traditional PERT / CPM network scheduling does not consider the resource constraints and human behavioral in the planning function and risk management, so it is difficult to overcome the impact of multi-task and uncertainties. This paper introduces the critical chain to control the progress of the project. It achieves effective control of the progress through the management of critical chain and setting up of appropriate buffer. And then it will improves the overall level of construction management.
Keywords: construction economics; the critical chain; construction project; progress control; buffer

Title: Analysis on structural static mechanics and stability of ancient Yuqing Bridge

Authors: TAN Pei, ZHANG Yan, GUO Jianhong
PP: 170～175
Abstract: On the basis of field measurement, the paper uses ANSYS finite element software to carry out a static simulation analysis on Yuqing Bridge, which has a style of ancient beam having inclined column. After modeling amendment, it gives a stability analysis of the inclined column and comes to a conclusion that it has its maximum ultimate load when the inclined angle is from 8° to 12° When the column is upright, the load capacity will reduce about 40%. The load capacity will reduce sharply when the inclined angle is below 8° or above 12° In the end, it estimates the load capacity of the bridge.
Keywords: structural mechanics; ANSYS modeling; component inflection analysis; structural mechanical analysis bridge stability; practical application of structure

Title: Experimental research on nondestructive testing of Cl- content in concrete

Authors: SI Wei, DONG Yanan, ZHANG Kele, CHEN Jianwen, JI Yongsheng
PP: 166～169
Abstract: In this paper, Ag/AgCl electrodes were prepared by anodic electrochemical oxidation and embedded in the concrete, served as Cl- probes. The potential responses of probes were measured in-situ in concrete simples in solution with different concentration of Cl- and compared with the response relationship in simulated concrete pore solution. The results showed that the former response relationship was consistent with the latter. Because of the long term stability of the potential, the probes can be used in testing Cl- content in concrete at different depths.
Keywords: nonmetallic building materials; concrete; Ag/AgCl; electrode; potential; nondestructive testing

Title: Determination of economical insulation layer thickness of a new directly-buried thermal pipe based on principle of energy economics

Authors: MING Yan, WANG Fei
PP: 161～165
Abstract: Based on the principle of energy economics, for increasing income and decreasing the annual total cost of unit pipe length, the paper studies a calculation method of economical insulation layer thickness of a new prefabricated directly buried insulating pipe (compound pipe of steel strip with borehole net and polyethylene of raised temperature compound pipe used as service pipes) when double-tube are laid. Comparing with traditional design method, the new design method can reduce energy consumption by 17%~24% when supply and return water temperature is 85/60℃ and 9%~22% when supply and return water temperature is 60/50℃. So the method of computing economical insulation layer thickness based on the principle of energy economy is more reasonable. The paper also programs calculation procedure, and analyzes the effect of energy price, thermal conductivity of insulation material and buried depth on the economical insulation layer thickness. The result can be referenced for engineering design.
Keywords: heating, gas supply, ventilating and air conditioning engineering; economical insulation layer; energy economics; compound pipe of steel strip with borehole net and polyethylene of raised temperature; directly buried

Title: Analysis on influence of weak interbed on stability of surrounding rocks of underground cavern in earthquake

Authors: YUAN Da, LI Jinbo
PP: 156～160
Abstract: In this paper, finite element method is used to analyze the influence of weak interbed on stability of surrounding rocks underground cavern under the action of earthquake. This paper selects a gate-type tunnel as the research object, and focuses on research and analysis of displacement and stress influence coefficients of key points of the tunnel by use of a variety of combinations of the weak interbed and surrounding rocks. The results show that: in the earthquake, the presence of weak interlayer has both damping effect and amplification effect to the underground cavern. The paper also summarizes the degree and law of influence of the weak interbed on stability of surrounding rocks of underground cavern under various conditions in the earthquake, thereby providing advices for earthquake resistant design of the underground cavern.
Keywords: substructure; underground structures; weak interbed; earthquake response; influencing factor

Title: Experimental study on deformation and fracture characteristics of rock on condition of unloading

Authors: HUANG Da, HUANG Runqiu
PP: 150～155
Abstract: Based on unloading tests of rock samples, the fracture features and complete stress-strain curves of rocks on the condition of unloading are studied. The researches show that: the characteristics of intense rebound deformation, distinct dilatancy and brittleness failure of rocks present in process of unloading; the fracture is characterized by strong tensile one, all kinds of tensile cracks are developed, the shear fractures expand following tensile cracks and their primary styles are conjugate X or partial shear one on the condition of unloading; and the tensile cracks possibly appear in hypo-unloading one when the rock samples are unloaded in two directions.
Keywords: rock mechanics; unloading test; deformation feature; fracture feature

Title: The project case study of carbon fiber cloth’s reinforcement on cast-in-situ floor-slab

Authors: WEN Faming, WEN Siqing, ZHANG Jingwei, JIA Yong, HUANG Xinxian
PP: 145～149
Abstract: In recent years, reinforcement and strengthening technology had large amount of the theoretical and engineering researches are focused on reinforced concrete (RC) beam, column, and their node, and less of them involve the research on concrete slab, especially on cast-in-situ RC floor-slab. In view of this status, combining with the practical examples of the reinforcement engineering of new-constructed residences, this paper introduces in detail the specific technological methods and implementation key points of carbon-fiber cloth reinforced cast-in-situ RC floor-slab from the aspects of engineering situation, scheme determination, craft construction and its effect evaluation and so on, so as to offer reference for the people who are specialized in the strengthening, testing, and research of reinforcement technology. The practice has proved that this method can effectively enhance the bearing capability of the reinforced floor-slab, restrain the width of the cracks and slow the growing speed of cracks, and has good comprehensive benefit.
Keywords: civil engineering construction; sticking construction; carbon fiber cloth; cast-in-situ floor-slab; strengthening detection

Title: Research on design of edge space of open city park

Authors: ZUO Jin， SU Wei， ZHU Jie
PP: 138～144
Abstract: Nowadays opening becomes a main tendency of city parks’ development. This paper studies the definition of edge space of city park and analyzes the relationship between the edge space and the place inside and outside the park. It sums up the characteristics of this new kind of space as below: transitional, stratified, fuzzy and multiform. By investigating several actual cases and practices, this paper brings forward the main points of open city park’s edge space design from five aspects: traffic organization, functional area division, vision control, commercial development and facilities’ setting. It is supposed to benefit design and practice works of city parks in China.
Keywords: urban planning; open city park; edge space; space characteristic; point of design

Title: Analysis on the influence of inclination angle of soil nailing on slope stability

Authors: LIANG Renwang, JIA Hengguo
PP: 133～137
Abstract: This paper analyzes the stability of soil nailing wall based on the simplified Bishop method and two engineering examples.The complicated calculation is completed by Matlab which has powerful calculation and drawing function. The paper analyzes the relationship between soil nailing inclination and slope stability safety factor, obtains the curve of soil nailing inclination and safety factor, and describes general law between the both: soil nailing has different optimal inclination for differrent projects, the role of soil nailing can play globally when it is in the optimal inclination, this can reduce engineering cost. It can remind engineering designers that not all engineerings have the same optimal soil nailing inclination.
Keywords: civil architecture; soil nailing retaining; inclination; slope; stability; safety factor

Title: Preliminary research of Semi-Active-TMD based on time-frequency analysis in wind-excited control

Authors: YIN Fei, TAN Ping, HUANG Dongyang, ZHOU Fulin
PP: 128～132
Abstract: This paper proposes a novel tuned control strategy for SA-TMD based on time-frequency analysis. Short time maximum entropy methods were used to identify the time-frequency-power spectrum of the structure vibration signal which is frequency variable on real-time. It is effective to adjust the frequency of the tuned device according to this measure. Fluctuating wind was simulated by AR model based on Davenport spectrum. Selected a 26-storey, 103.5-meter-high high-rise building controlled by SA base on time-frequency analysis control strategy. The numerical simulation result shows good effect, and much better than a passive tuned mass damper(TMD).
Keywords: engineering structures; time-frequency analysis; semi-active variable stiffness tuned; high-rise building; wind control

Title: Experimental and theoretical researches on axial compressive bearing capacity of multi-ribbed slab wall

Authors: YAO Qianfeng, LIU Haitao, XU Jian
PP: 123～127
Abstract: By the bearing capacity test of four 1/2-scaled multi-ribbed composite walls, the paper finds out the failure process and characteristics, analyzes the effect of filling block, eccentric loading and depth-thickness ratio on axial compressive bearing capacity. Meanwhile, based on the experimental study, with elastic foundation beam theory, a mechanical model is suggested for multi-ribbed stab structure under axial compression. Results of the theory analysis and experiment show that the mechanical model is exact, and the mechanical model provides an important theory foundation for more development of compression capability analysis of multi-ribbed slab structure. At last, the axial compressive bearing capacity formula is given, the stability coefficient of wall considering the effect of block and the improvement factor of compressive strength considering the effect of block are also given.
Keywords: structural engineering; multi-ribbed composite wall; experimental study; axial compression

Title: Study on load-carrying capacity of concrete-filled steel tubular column

Authors: JIAO Yunqing, CHEN Shiming
PP: 115～122
Abstract: Application of concrete-filled steel tubular (CFT) columns becomes more and more popular in building and construction engineering. This article presents a comparative study of main current design methods of different countries for the load-carrying capacity of concrete-filled steel tubular columns, and the differences between the current design methods in assessing the load carrying capacities of the composite columns the under axial loading and the eccentric loading are commented. Comparison analysis is carried out on the test data from the (Association for Steel-Concrete Composite Structures, ASCCS) database against the calculated results derived from the main current design methods for the composite columns, and the accuracy and discreteness of the methods are analyzed.
Keywords: structural engineering; concrete-filled steel tubular column; ultimate capacities; main codes

Title: A stabilized finite element technique of large eddy simulation for turbulent flow with high Reynolds number

Authors: HUANG Cheng, BAO Yan, ZHOU Dai
PP: 109～114
Abstract: In this paper, a stabilized finite element technique is developed to predict turbulent flow with high Reynolds number which can be applied in the simulation of turbulent fluid flow such as wind flow. Finite element method (FEM) is implemented with streamline upwind Petrov-Galerkin (SUPG) stabilized technique for the formulation of Smagorinsky sub-grid scale (SGS) model of the incompressible viscous flow in large eddy simulation. A series of computation is performed using isoparametric element difference function with volecity and pressure of the same order for space discretization. A series of computation is performed using highly-stabilized three-step FEM with second order accuracy for time discretization. And Nomura’s wall damping function is enforced for the no-slip boundary condition of the bluff body surface. Lid driven flow of Re=105 in a triangular cavity and turbulent flow past a square cylinder of Re=22 000 are discussed as numerical examples. Results show that the present technique can effectively suppress the numerical instabilities of the fluid flow caused by convection term with a moderate number of elements and well predict the result.
Keywords: engineering structure; large eddy simulation; finite element method; high Reynolds number; streamline upwind Petrov-Galerkin

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