bluuebunny/crossref_metadata_2025 huggingface dataset:
A Study on Spatial Forms Characteristic of the Historic Towns in Yuan River Basin
Authors: Zhou Hong , Li Bai Hao , Xiao Qing
Published: August 2011

The historic towns in Yuan River basin, with the same origin in water and mountain, has similar geographical environment, interlinked regional economy and inclusive multi-ethnic culture, all of which have a large contribution to both similarities and differences of the space forming of the historic towns. The space form respects for nature with the flexible layout and embodies the leading role of the water transport economy for space form of ancient town. The towns have Similarity of space form elements, convergence of space combinations, ecological of spatial layout and other features. At the same time, diverse types of spatial forms showed peoples wisdom and courage of adapting to nature and working out measures to suit local conditions in Yuan River basin. All these previous experiences supply valuable experience for construction of the small historic town in the present.
Improvement of Underwater Soft Subsoil in Tidal Zones by Vacuum Preloading Technique
Authors: Liu Ai Min , Yan Shu Wang , Yin Chang Quan
Published: August 2011

In view of the characteristics of the natural conditions in tidal zones, systematic innovation and improvement have been made in the techniques to execute conventional vacuum preloading technology in combination with sand cushions, technology for installation of prefabricated drains, sealing membrane and technology for laying sealing membrane, and technology for vacuum pumping, to overcome the difficulties in improving underground soft soils in tidal zones. Key techniques in improving underwater soft soils in tidal zones have been solved and the vacuum preloading technique was successfully used in improving soft soils in tidal zones, producing very good results.
The Effect of Silane Coupling Agent and Fiber on Microencapsulated Paraffin Insulation Mortar
Authors: Chen Shu Lian , Yan Hua , Zhang Jian
Published: August 2011

This paper mainly deals with the preparation and performance of microencapsulated paraffin insulation mortar. Silane coupling agents are used to modify the surface of the microencapsulated paraffin, and fibers are introduced to solve the cracking of microencapsulated paraffin insulation mortar. Research has been carried out on the effect of the type and dosage of silane coupling agents and fibers on the performance of insulation mortar, the result of which shows that KH550 and polypropylene fiber are of good performance and that their optimum dosages are 13% and 0.3% respectively, the dosage was referred to as the percentage according to the weight of cement.
Research on Green Building Teaching Based on the Integration of Multi-Disciplinary
Authors: Tong Hui , Zhao Bin , Li Bin
Published: August 2011

Green building is the integration and combination of multiple construction techniques based on the idea of green building. The practice of green building should take root in the combination of multiple subjects. Based on the direction of undergraduate teaching of “Integration of Solar Energy and Building”, which is firstly piloted by Shandong Jianzhu University（SDJZU）. This paper discusses the idea and methodology of infusing theory and technology of green building into architectural design. With the analysis of the designs by undergraduates from SDJZU which won prizes on 2009 Taida Int’l Solar Power Construction Design Contest, it also summarized the vital significance of multi-disciplinary integration to the establishment of the idea and improvement of design methodology in green building design.
Study on the Fracturing Height of Overburden Strata of Coal Face Based on Microseismic Monitoring
Authors: Guo Xiu Jie , Zhang Ming , Yang Yong Jie , Wang Min
Published: August 2011

Coal mining causes the failure of overburden strata and forms caving and water-conducting crack zones,meaning “two regions”.The reliability of the monitoring result of fracturing height of overburden strata is a key factor to define the upper bound of safely mining.Because of the strain energy released during the formation of two regions,the corresponding weak seismic wave is made at the same time. Through the microseismic monitoring analysis of the fracturing height of overburden strata in 3up 107 coal face of Luxi Coal Mine , the distances of the uppermost 10 percent microseismic events of the overburden strata are relatively large and the energy is relatively small, so it is difficult to form the effective cracks conducting water.According to that, the fracturing height of overburden strata is determined as 38 m which is better consistent with the 36.2m which is defined by the in-site measuring method.Microseismic monitoring technology is proved to be available in determining the fracturing height of overburden strata of coal face.
The Green Ecological Tourism Development Concept Plan of Subtropical Desert in Hou Tian Desert in Xinjian County
Authors: Chen Wu Ying , Liao Qi
Published: August 2011

Hou Tian desert is located in the south of Xinjian County, Nanchang, Jiangxi Province, which is the largest sub-tropical land of Desertification. This paper explores and analyzes the existing conditions of the desert and development, under the premise of reasonable governance desert and protecting the surrounding environment, then proposing the green ecological development planning program of this project and the overall spatial layout.
Experimental Study of Behavior of Ceramsite Concrete Filled Steel Tubes after Exposure to Fire
Authors: Zhou Ming , Wang Xin Tang , Wang Jian Min , Xie Zhi Guo
Published: August 2011

The post-fire behavior of a set of ceramsite concrete filled steel tubes (note as CCST) after exposure to fire are experimentally studied. Effect of the maximum value of fire response temperatures of the tubes and their geometric parameters on the strength and ductility of the specimens were especially discussed. The test results show that the specimens of CCST have higher post-fire bearing capacity and better ductility, there was no obvious descent segment in post-fire load-displacement curves of the most specimens subjected to fire load. It was concluded that the maximum response temperature of specimens has great effect on the post-fire bearing capacity of concrete-filled steel tubes subjected to fire load.
Numerical Analysis of Fire Behavior of a Large Space Pre-Stressed Steel Structure under Fire
Authors: Zhou Ming , Xie Zhi Guo , Wang Xin Tang
Published: August 2011

The computational model of numerical analysis of a suspended pre-stressed steel reticulated shell subjected to fire load is established with using the software Marc. Based on the model presented here, numerical analysis of thermal response and structural response of the pre-stressed steel structure are computed. The different space height and different rise-span ratio are considered for analysis of response temperature, displacements and stresses of the pre-stressed lattice shell under fire for one fire source. It is also shown that displacement of the node right above the inner cable is the maximum among the four nodes presented here as the fire source is located at the position right below the second-ring cable of the structure. It is concluded that the influence degree of space height of the structure on the fire response of the structure is not great, but rise-span ratio has obvious and great effect on displacements and stresses of the pre-stressed steel structure with large span in fire.
Stiffness Analysis of Welded Spherical Joints with Rib Stiffeners
Authors: Wang Xing , Wang Fan
Published: August 2011

Joint’s stiffness has important influence on stability bearing capacity of large-span spatial reticulated shell. The welded hollow spherical joint with rib stiffeners is a type of joint applied widely on large-span spatial reticulated shell. In this paper, the axial flexibility and flexural stiffness of welded hollow spherical joint with different rib stiffeners are analyzed with the FEM software ANSYS, compared with the non-rib hollow spherical joint’s stiffness, then the calculation formulas of the axial flexibility and flexural stiffness under different rib stiffeners are given through regression analysis. Some important conclusions were obtained, which can provide theoretical foundation for the stability bearing capacity analysis considering joint’s stiffness and can be applied on practical design..
Triaxial Low-Temperature Creep Tests of Artificially Frozen Soil
Authors: Li Dong Wei , Fan Ju Hong , Wang Ren He
Published: August 2011

With the increasing in freezing shaft sinking depth of the mine，Mine permanent derrick was located into the frozen wall. The internal force distribution of the shaft-tower foundation was obtained by field measurement shaft-tower foundation basal pressure, foundation reinforced strain and the strain of concrete and foundation deformation of mechanical quantity. The numerical simulation of the interaction between coal derrick and foundation in freezing and thawing process shows that: the field measurement and numerical simulation laws were consistent and the values were in good agreement. It has very important theoretical and practical significance for the safe production of derrick and future derrick foundation design in freezing method construction.
Study on the Dynamic Model for Deep Hard Rock near the Blasting Cavity
Authors: Li Jie , Chen Wan Xiang , Song Zhi Wen , Yu Liang
Published: August 2011

Basing on the LS-DYNA9703D’s user’s material coding platform, the user-subroutine is coded, and simulates the dynamic behaviors of the coupled-charge rock caused by the spherical charge blasting when the rock mass is surrounded by high confining pressure. The simulated results and related experimental results are compared. The results show that the modified C.C.Grigorian model agrees with the similar test and is suitable for the calculations on the cavity surrounded by high confining pressure, and swelling of the blasting cavity is significantly restricted and relative cavity’s radius and ratio of rock mass’s strength and confining pressure is nearly linear.
Research on the Disposal for Fly Ash Weak Foundation by Spraying Powder Pile
Authors: Zhang Jian Wei , Zhu Min Jie , Zhang Li Wei
Published: August 2011

This paper studies the technical application of the disposal for FA(fly ash) weak foundation of these abandoned fly ash pool by the construction technology of spraying powder pile, so that, not only these abandoned fly ash pool will be used effectively as soon as possible, but also the surrounding environmental pollution will be improved well. The construction technology of reinforcement weak foundation is efficient, low cost and no pollution. In order to argue it, this paper will discuss the mechanism and feasibility of the construction technology based on first phase project of Xinmei car limited liability company.
Study on Analogue Simulation of the Influences of Thermal Parameters on the Performance of Water Source Heat Pump under Variable Working Condition
Authors: Qu Shi Lin , Luo Han Qing
Published: August 2011

Taking thermal parameters such as evaporating temperature, condensing temperature, superheating temperature and sub-cooled temperature as the basic variables and serving COP and heating capacity as evaluating indicators, this paper builds a series of mathematical models according to the rationale of WSHP and the correlation of its components and a simulation platform based on Laboratory Virtual Instrument Engineering Workbench (LabVIEW), simulates and analyzes the influence of thermal parameters on the performance of WSHP under variable working condition. The results show that evaporating temperature and condensing temperature have more significant effect on the performance of WSHP than both of superheating temperature and sub-cooled temperature and lower condensing temperature and higher evaporating temperature can raise the value of COP but reduce heating capacity. They also show that lower superheating temperature will bring higher value of COP but lower heating capacity and higher sub-cooled temperature can make both COP value and heating capacity increase. On the simulative condition, the influence rates of evaporating temperature, condensing temperature, superheating temperature and sub-cooled temperature relative to COP of WSHP respectively are 2.25%，2.61%，0.7% and 0.51% and the influence rates of these temperatures relative to heating capacity respectively are 1.32%，1.09%，0.58% and 0.77%. These results may provide with some reliable foundations on optimizing operation and control of WSHP under variable working condition.
Research of Building Energy Efficiency Design and Engineering Quality Management System Based on Network
Authors: Wang Ling , Tian Wen Ling , Fan Ling Ling
Published: August 2011

Based on the analysis of the trends of building energy consumption and the situation of standard of building energy efficiency, the thought of system development for building energy efficiency design and engineering quality management based on Network is proposed. Data control processes, modules and functions of system is introduced. This system is an opening system; it has better adaptable to change of standards.
Test Study of Compressive Strength of High-Strength Stone Masonry
Authors: Hu Da Lin , Chen Long Gang , Chen Feng
Published: August 2011

Stone masonry with micro-aggregate concrete joints has been widely used in long span arch bridges in China. However, the mechanical properties of this kind of high-strength masonry have been seldom studied. This paper presents compressive strength test study of eight groups of masonry specimens, which consist of C30 or C40 micro-aggregate concrete joints and five kinds of dressed stone blocks. The masonry mechanical behavior is described and test results are analyzed. An empiric formula of the masonry compressive strength is obtained. Finally, design value of masonry compressive strength is assessed and discussed.
Experimental Investigation of Heat Transfer Performance of a Miniature Loop Heat Pipe with Flat Evaporator
Authors: Zhang Xian Feng , Wang Shuang Feng
Published: August 2011

The present work experimentally investigated the operating characteristics of a miniature loop heat pipe (LHP) under different power cycle. The miniature LHP with flat evaporator of 8mm thick is made of copper. The evaporator with sintered copper power wick is in series structure with compensation chamber. Water is working fluid. It is found that the LHP can start up at heat load of 15W with temperature oscillation and the maximum heat load is 160W with Rl=0.068°C/W. The LHP operates unstably under low heat load. The oscillating frequency of temperature rises with heat load increased. The operating performance of the LHP is affected by the power cycle.
Crack Resistant Performance and Crack Width of one-Way Slabs Strengthened with FRP
Authors: Gao Dan Ying , You Pei Bo , Zhang Chang Hui
Published: August 2011

Based on the tests of six reinforced concrete slabs strengthened with fibre reinforced plastic (FRP) sheets and one reference slab without the sheet, the influences of factors such as type of FRP sheets (CFRP and GFRP), amount of FRP sheets and strengthening scheme upon the crack resistant performance were presented and discussed in this paper. In the end, a calculation method was put forward, which can be used to calculate cracking moment and crack width in reinforced concrete slabs strengthened with FRP sheets.
Research on a New Type of Energy Dissipation Brace
Authors: Sui Jie Yjing , Liu Wen Feng
Published: August 2011

This paper presents one new configuration called little-character-toggle-brace. This paper analyses the effect of different toggle-brace position in the story and different angle of the toggle-brace to the magnification factor and provides the damping radio of the structure. Based on vibration control test of the structure with energy dissipation devices, the dynamic behavior and dynamic response of the structure with little-character brace, diagonal brace or little-character- toggle-brace have been investigated. The different control effects of the structure with the different energy dissipation braces have been studied. The result demonstrates that the little-character-toggle- brace is the best energy dissipation brace.
Composite Foundation on Bearing Characteristics and Simulation Analysis CFG Pile for the High Speed Railway
Authors: Jiang A Lan , Wang Mei Xia
Published: August 2011

With the rapid development of high-speed railway in soft foundation, foundation treatment technology has become mature, the most outstanding is CFG pile composite foundation technique. CFG pile composite foundation is made of cement fly ash gravel pile(CFG pile), pile of soil and sandstone , between sand and gravel several problems such as the medium material composition together constitute layer. It has high bearing of capacity, convenient, low costing, strong adaptability and quality control easier.So it is widely applied and promoted. Under static and dynamic loads, the relations of the high-speed railway CFG pile composite foundation is very complex. In order to further understand the intensity of pile-net structure subgrade stability and deformation, pile , requirements of the high-speed railway roadbed ,it needs to do pile-net structure parameter sensitivity analysis. According to high-speed railway CFG pile composite foundation , the numerical analysis can well solve the coupling effect of piles and soil. So, this paper adopts FLAC3D finite difference software is simulated and analyzed.
Study on Seismic Response and Countermeasures of Long Span Cable-Stayed Bridge under Long Period Ground Motion
Authors: Zhao Guo Hui , Zhang Wen Hua , Zhao Jian Hui
Published: August 2011

Long period ground motion has great influence on long period structures such as large oil tank, high-rise building and long span bridge. In this paper, a long span cable-stayed bridge is taken as an example to study the seismic response of long period structure under long period ground motions and conventional ground motions by using nonlinear dynamic time history method. It is shown that although the peak acceleration of the long period ground motions are no more than half of conventional ground motions, the displacement and force response of the bridge at key points under long period ground motions are much greater than that of conventional ground motions. Constraint cables and fluid viscous dampers are used to reduce in the influence of long period ground motion of the bridge, and the effects of the two countermeasures are also analyzed in this paper. The results show that constraint cables have unstable effect and even negative effect under long period ground motion. While fluid viscous dampers have stable effect under both long period ground motion and conventional ground motion with proper damping parameters.
Studies on Application of the Trinidad Lake Asphalt on the Pavement in the Quarter Natural Frozen Area
Authors: Li Hong Dong
Published: August 2011

According to the conditions of the research in both civil and aboard, and thinking of the northeast region's climate characteristics, we research performance of the bitumen with different dosage Lake asphalt. And we also analyze the Lake Asphalt mixtures with two representative kinds of aggregates. Pave test-road and summarize the construction technology of the lake asphalt mixture.
On the Stress-Strain of Steel Tube Column Filled with Steel-Reinforced Concrete Subject to Compression-Flexure Loading
Authors: Liu Xiao , Li Min
Published: August 2011

In order to study the bearing capacity and section stress-strain distribute on the steel tube filled with steel-reinforced concrete (STSRC) compression-flexure column, four compression-flexure members of STSRC were tested and theoretical researched. The major parameters of the test were axial compression ratio (n=0.5~0.85). The result of the study showed that: load-deformation() typical curve includes three stages, elastic characteristic, elastic-plastic characteristic, and disruption; Along with the increase of axial compression ratio, the bearing capacity and ductility reduced, but the peak displacement had not change enough; The composite column conformed to plane section, and the larger the axial compression ratio, the further distance of neutral axis of section to the centric axis and closer to the tensile region. ; During the loading process, the steel skeleton in compressive zone yield, but in tensile region never yielded. According to the test results and the limit equilibrium method, the formula for calculating the compression-flexure member of STSRC was established. A good agreement between the calculation results and testing results illustrates, which is feasible to using the calculating formula to calculate the bearing capacity of STSRC.
Construction Technique of Pile-Board Subgrade Crossing Over-Shallow-Embedded Metro in Deep Soft Ground
Authors: Su Qian , Bai Hao , Liang Long Biao , Li Xing
Published: August 2011

Subway shield lining segments are highly sensitive to peripheral soil disturbance. Shield displacement may destroy the whole structure which can not be repaired, and directly affects the subway operation safety at the worst. Therefore, it is necessary to reasonably determine the construction technology, in order to avoid the unfavorable influences caused by construction disturbance. According to the pile-board subgrade scheme which is adopted by the comparison of schemes, also considering the high risk of over-shallow-embedded metro construction, we put forward the key construction technique of pile-board subgrade, including: technique of casing tube bored pile, construction process of pile-board structure and monitoring of settlement and deformation which are important to guide the similar projects.
Study on Detailed Design of Kitchen and Bath in Small and Middle-Sized Apartments
Authors: Tian Mi Mi
Published: August 2011

The design of kitchen and bath for small and middle-sized apartments requires details since it is conducted within a small space. Kitchen and bath space has different functions, and the needs for functions vary among different households. The author put forward the idea of a detailed design mode of kitchen and bathroom space in China by referring to characteristics and structures of designs for Japanese small-sized apartments, which combines Chinese-and-western style kitchen, composite bathroom and unified wring.
Computation of Distinguished Hyperbolic Trajectories in Time-Dependent Vector Fields
Authors: Yao Peng , Wang Yan Bo , Chen Gai Rong , Li Qiong
Published: August 2011

By studying the definition of DHT (distinguished hyperbolic trajectory) and existing measure function in phase space, a measure function in the extended phase space is presented in this paper. Effect of system frequency on computation of DHT is explored. Two-dimensional and three-dimensional Duffing systems are taken as examples. The comparison between measure function in extended phase space and that in phase space and the comparison between natural frequency and twice frequency are both given by figures.
Monitoring and Analysis on Temperature for External Foam Glass Thermal Insulating System on Walls under Weathering Test
Authors: Niu Zhi Rong , Xiong Hou Ren , Yu Zong Min , Xiang Yi , Luo Yi Ying
Published: August 2011

The external foam glass thermal insulating system on walls has become a new thermal insulation wall system in china's building wall, It is green energy - saving building wall product with good prospect and used for wall thermal insulation of building. In this paper, real-time monitoring with thermal sensor and analysis on temperature for external foam glass thermal insulating system on walls by weathering test in Jiaxing area, and study on temperature distribution for each layer of walls. The experiment showed that, the external foam glass thermal insulating system on walls caused by foam glass insulation layer of adiabatic effect, Interface layer and thermal insulation layer of temperature difference between change significantly, existing 50 °C, which can cause greater temperature stress, and have certain effect of durability for external foam glass thermal insulating system on walls.
The Construction and Application of Green Residential Community Water-Saving Evaluation System
Authors: Jia Ren Fu , Ou Dan Ping , Zhang Jiong , Fang Shi Biao
Published: August 2011

Based on the construction principle of green residential community water-saving performance evaluation index system, we built the green residential community water-saving evaluation index system, and use Analytic hierarchy process (AHP) to make sure the weigh of each influence factors, then we construct the fuzzy comprehensive evaluation model, also analyse the case of a residential community in Jiangyin city, conclude the result of evaluation.
Definition and Evaluation Modeling of Transportation Network Layout Adaptability
Authors: Gao Jie , Wu Mei Xiang , Yin Chen Qiang
Published: August 2011

According to the reliability theories and the characteristics of transportation networks, the layout adaptability is defined as the coupling and coordination degree of transportation network capacity and demand firstly. Then a layout adaptability model is built adopting the optimization methods, degree of layout adaptability index and coefficient of variation are used to evaluate the adaptability of scale and distribution respectively. Meanwhile, the heuristic algorithm suitable for large scale is designed to solve the proposed model. At last, a numerical example and its results are provided to demonstrate the validity of the proposed model and algorithm.
Flexibility Method of Damage Identification for Transmission Tower Based on Signal Amplitude Vector
Authors: Zhou Ling , Cheng Hua , Wang Zhong Gang , Zhou Jun Long
Published: August 2011

In this paper, the flexibility method of damage identification for transmission tower based on Wigner-Ville Distribution (WVD) signal amplitude vector is forwarded. The damage coefficient equation involving modal parameters and damage parameters is firstly established, on the basis of the linear relation of flexibility matrix and structure parameters. Then, the mathematical deduction of WVD signal term reveals the function relation between WVD signal terms and modal parameters. Lastly, the damage coefficient equation is solved by substituting mode shape vector with the signal amplitude vector of response under suddenly unloading to identified the position and extent of structural damage. A numerical example demonstrates its accuracy for damage identification and excellent noisy immunity.
A Fuzzy Approach to Assess the Contractor’s Competitiveness
Authors: Dong Na , Zhang Jing , Yu Min Jiu
Published: August 2011

A competitive contractor is the guarantee of project’s success, so how to choose a suitable contractor is critical for the owners. However, among the influencing factors considered in the selection, some can be quantitatively evaluated with clear evaluation criteria while others can only be qualitative evaluated so that no specific scores can be obtained. For the above reasons an improved fuzzy comprehensive evaluation method is proposed in which all assessment factors are divided into two categories and are evaluated with different criteria. The method integrates the advantage of quantitative evaluation and qualitative evaluation. Finally it is verified by a case and the result shows that the application of the improved fuzzy approach to choose contractor is effective and reasonable.
Stress Monitoring for the Whole Construction Process of Simply Supported to Continuous T-Beam Bridge
Authors: Yang Wu , Yao Wen Juan , Liu Xiao Yu
Published: August 2011

In order to research on the stress change and influencing factor of whole construction process of simply supported to Continuous system T-beam bridge, combined with Guizhou Bai-long bridge, the stress change is carried out the real time inspection in each construction stage, and the finite element model is established to analyse Stress changes in whole construction process. The monitoring value is ​​more consistent with the theoretical value in each stage , monitoring dates and theoretical calculations showed that pre-stressed is the main factor of stress changes in construction process.Pre-stressed tension in negative moment region has obvious influence on the stress of middle span, the stress of top and bottom plates in wet joints will be equivalent after tendons tension in negative moment Region.
Analysis and Countermeasure of Transformer Faults Caused by Corrosive Sulfur
Authors: Qian Yi Hua , Hu Hong Hong , Li Zhi
Published: August 2011

Based on electrical and chemical analysis in oils of some fault transformers in Shenzhen, it indicates that the corrosive sulfur contained in insulating oils may cause faults. Corrosive sulfur would react to copper wire and engender Cu2S during the operation of transformer. Because of the electric characteristic of Cu2S, this substance will penetrate and pollute insulating paper of the wire, and then weaken the insulation intensity. At last it would wear out coil insulation. Experiments indicate that adding passivator to insulating oil is an effective method to solve the problem. Passivator can form a protection layer on the surface of copper, which can avoid copper corrupting and can stop copper deposition in the presence of potentially corrosive sulfur compounds as well.
Study on the Analysis of Secondary Anchoring Mechanism and Effective Distance
Authors: Jing Lai Wang , Ye Li Ping , Hao Peng Wei , Zhao Ke Xiu
Published: August 2011

The paper is intent to open out the mechanism and effective distance of secondary anchoring in coal mine rock laneway support. Though the analysis of elastoplastic deformation, caused by heading face support removing in laneway development, the paper explained that secondary anchoring is necessary and important to rock laneway, and relatively exact data were given by FEM analysis. The paper illustrated a special example, and put it up with meticulous analysis, the results were not only having important reference value to coal mine soft rock laneway support, but also having definite use for reference to other mine soft rock laneway support.
Research on Green Construction Planning
Authors: Zhang Jian Wei , Zhu Min Jie , Zhang Li Wei
Published: August 2011

On the basis of comprehensive green construction concept in China, This article focuses on the construction design of how to strengthen and highlight the green construction planning, and how to reflect the organization of green construction, concept, target system, correcting, enhancing and other links, through the green construction planning during the entire process of construction. As we know, the construction design is a programmatic document to guiding the construction, if in the entire process, gives full expression to the idea of green construction plan, and then, for the promotion of green construction will have a positive effect.
Research on Sheet Crack Identification of Frame Structure Using Wavelet Analysis
Authors: Guan De Qing , Zhong Xiao Lin , Ying Hong Wei
Published: August 2011

This research presented the damage identification problem of frame structure using the wavelet transform of strain mode. Solving strain modal parameters of plane frames with cracks by means of the finite element theory, applying the gauss2 wavelet transform to analyze the stain mode of plane frame, and denoising the wavelet coefficients of the strain mode by db3 wavelet, then the location of crack of the plane frame could be identified by the maximum of wavelet coefficients after denoising. Taking one-layer plane frame as an example, this research gave the finite element model of framework with sheet crack (non-through surface crack and internal crack), calculated the strain mode of the structure, and identified the location of cracks by wavelet analysis of strain mode. Results show that this method is able to identify the damage of frame structure. Numerical calculation shows that the approach is effective. This paper provides a valuable reference of structural damage identification and diagnosis in engineering applications.
Damage Identification of Elastic Plate Based on Strain Mode Wavelet Analysis
Authors: Guan De Qing , Ying Hong Wei , Zhong Xiao Lin
Published: August 2011

By means of the wavelet analysis theory, the damage identification of elastic plate was studied. Adopted the finite element method to analyze the dynamic character of the plate and applied the method of Lanczos for calculating the strain mode, and the strain mode is analyzed by mexh wavelet (Mexican Hat wavelet). The location of the declining stiffness is identified by the place where maximum of wavelet coefficients appears. Therefore, this method is applied to the elastic damaged plate. Three types of damaged regions in rectangular simply supported plate are recognized, which indicates this method is effective and accurate. And this method has a certain value in the project application.
Computer Modeling for Different Piles Reinforcement in Control Deformation of Pavement
Authors: Zhou Yong , Liu Jian Xin
Published: August 2011

Multi-pile composite foundation is a method of ground improvement that involves using different pile types with different lengths and diameters beneath the same raft. The types of piles are chosen to mobilize the strength and stiffness of the soil at shallow depths. CFG (cement–flyash–gravel) pile and powder spraying pile have been widely applied in civil engineering, and gradually in highway foundation engineering. But the settlement of the pavement reinforced by the two types of piles has seldom been studied. In the present paper, the numerical simulation software FLAC3D is adopted to simulated the highway foundation reinforced by CFG pile and powder spraying pile , the spacing of piles and cushion thickness are changed, the settlements of the pavement are obtained to give guidance for the real practice.
Research on the Benefits of Mortar Perfusion Repair Technology Based on Entropy Weight and Fuzzy Evaluation
Authors: Zhang Qiang , Jiang Wen Jing , Liao Fang Wei
Published: August 2011

In the presented work, the comprehensive evaluation index system of the repair and reinforcement technology carried on mortar perfusion machine is constituted by 24 indices. According to expert investigation data, entropy method and maximum membership degree are employed to determine the weight of each index and do comprehensive evaluation respectively. It could be found that the largest social benefit of this technology was achieved under the condition of an excellent overall efficiency. Finally, some policy recommendations are proposed based on the evaluation results of relevant technology.
Uncertainty and Sensitivity Analysis of Building Energy Demand Model Based on Occupant Behaviors
Authors: Zhao Zhi Bin , Xu Wei Sheng , Cheng Da Zhang
Published: August 2011

This paper attempts to illustrate Uncertainty Analysis (UA) and Sensitivity Analysis (SA) of real-time building energy demand model, which is derived from the dynamic relation of occupant behaviors and building space. UA and SA are indispensable sections of system development to insure the efficiency and accuracy of the model while there are three essential stage of UA and SA we followed. In terms of UA and SA, it is possible to structure a rational framework of complex dynamic network model, and discover the mapping between building energy demand and particular relation network patterns. We assume, firstly, a multi-mode dynamic relation networks model of occupant behavior, building space and temporal unit tends to be developed, and the definitions of basic model framework are given. Then, in the cases of the definitions in the basic model framework assumption, the propagation of uncertainty is taken into consideration according to the sampling based methods mapping the input parameters patterns onto the predictable results. Finally, we discuss the determination of sensitivity analysis with Morris method and Variance-based methods. In this paper, via UA and SA, our goal is to optimize the mapping procedure of the Dynamic Network Analysis (DNA) in building energy demand model, explore the essential input parameters pattern, and improve the precision of real-time model prediction.
Using Artificial Neuron Network on the Impact Characteristics Analysis of Free Overfall Flow
Authors: Hong Yao Ming , Lyu Hong Ting , Lin Hsueh Chun , Kan Yao Chiang
Published: August 2011

This study is to forecast the impact force and impact position of free over-fall flow in the downstream by using artificial neuron networks (ANN). A simulation procedure for the ANN algorithm was established to train and validate numerical samples with the experimental data. The outcomes of simulation show the ANN method can properly estimate the impact force and position.
Feasibility of Automatically Measuring of Large and Small Discharge in Open Channel Using Rectangular Sharp-Crested Weir
Authors: Zhang Xin , Yan Peng , Hua Ling , Ji Chang Zhi , Li Jia Zhen
Published: August 2011

Rectangular sharp-crested weir used for flow measurement in flume is limited by the minimum head since head- discharge relation of clinging flow is different from free flow. Hydraulic characteristics of clinging flow under low head are studied via experiments associated with simulation in six rectangular sharp-crested weirs with different geometric parameters. The results show that head-discharge relation is stable under clinging flow; head relation between clinging and free flow is linearly correlated at the same discharge in a bistable regime, existing discharge formula of free flow can be applied to clinging flow by means of head transform; the pressure on downstream weir plate is negative, much less than atmosphere pressure, and flow regime can be judged based on the pressure. It is feasible to automatically measure large and small flow using the simplest weir without head limitation.
Experimental Study on Nondestructive Monitoring of the Defects in Tamping Soil Cement Piles with Ground Penetrating Radar
Authors: Yang Xian Zhang , Liao Chun Fang , Wang Hai Dong , Luo Jie
Published: August 2011

In this paper, , the combination of antenna array detection method of ground penetrating radar is put forward to solve the actual engineering problem that is difficult to monitor the integrity of the flexural pile composite foundation. The experiments of defects of six tamping soil cement piles find that the relative error of the pile position of defects is 5.25%. The result indicates that it is enough reliability to determine the pile defects by using the GPR method and can meet the engineering needs. Furthermore, the effect of age of cement, the ration between soil and cement, depth and types of defects on the monitoring quality is obtained.
The Calculation of Critical Pile Length for Super-Long Pile Based on Settlement Control
Authors: Xia Li Nong , Miao Yun Dong , Tan Tie Qiang , Tong Xin
Published: August 2011

Based on the analysis of character of load-transfer of super-long pile, for the purpose of pile settlement control, critical pile length for single friction super-long pile was calculated by Cooke’s shear deformation-transfer model, because the assumption of Cooke’s model is similar with working condition of super-long pile. In the analysis, compression of pile is taken into account. Then, the design chart of critical pile length for super-long pile is provided for normal design index. Lastly, the critical pile length of an engineering example is analysed by the method, the calculated results have agreed well with the field measurement. The analysis show that critical pile length is greatly concerned with ratio of Young’s module of pile and soil, the greater the ratio is, longer the critical pile length is. Pile diameter also affects the critical pile length, the larger the diameter is, longer the critical pile length is. In addition, the critical pile length of super-long pile is concerned with shaft resistance distribution along the pile.
Exploration of Cloud Computing in the Program Management
Authors: Dong Shuang , He Qing Hua
Published: August 2011

Since the eighties of last century, the single individual project is gradually taken place by programs. The program management challenges the traditional methods and technologies for management as programs are much more complex than the single individual projects. In order to improve the program management performance, the essay comes up with the adoption of the new information technology cloud computing in program management. Based on the example of Shanghai 2010 Expo, we come to the conclusion that the application of cloud computing can highly improve the performance of program management with its powerful capacity.
Control Improvement of the Reactor Protection System
Authors: Zhao Bo Ya , Yang Song , Zhang Zhe , Sun Ri Sheng
Published: August 2011

In this paper an optimal maintenance policy for a Reactor Protection System (RPS) for a nuclear plant was developed. RPS consists of continuously operating sub-systems that were subject to random failures. A block system diagram for RPS had been proposed that facilitates analyzing of individual sub-systems separately. The proposed maintenance policy is the Age Replacement model, which incorporated both corrective and preventive maintenances. A Markov model was used to optimize the preventive maintenance interval of those sub-systems whose failure and repair rates were exponentially distributed. Finally, a sensitivity analysis had been performed and recommendations for maintaining the required RPS availability have been suggested.
Loading Process Simulation of GFRP Tube Filled with Steel-Reinforced High-Strength Concrete Columns Subjected to Eccentric Compression
Authors: Zhou Le , Liu Hong Tao
Published: August 2011

For the further study of bearing compressive capacity of GFRP tube filled with SHC（steel-reinforced high-strength concrete）columns subjected to eccentric compression, and analysis its whole bearing compressive process under eccentric compression. Based on the flat section assumption finite strip method, the calculating program of bearing eccentric compressive capacity of GFRP tube filled with SHC columns is proposed according to existing retrofit theory and related technical procedures. The relation curves of load-deformation is gotten using this calculating program, at the same time it can get the effect curves of concrete strength, slenderness ratio, eccentricity and containing bone rate to load-deformation. Calculations show that the ultimate bearing compressive capacity of composite column decreases with the increase of slenderness ratio, and elastic stage of component curve gradually shortens and stiffness gradually loses; The ultimate bearing compressive capacity of composite columns decreases with the increase of eccentricity; component ductility improves; the ultimate bearing compressive capacity of composite columns increases with the increase of concrete strength. The calculated results agree well with the experimental results and this study provides a basis for practical design.
Study on Friction Coefficient of Spiral Case with Cushion Layer in Large-Scale Hydropower Plant
Authors: Zhang Jian Wei , Zhang Yi Na , Yuan Shu Fang
Published: August 2011

Elastic cushion layer between the steel spiral case and surrounding concrete is often used as a structural type in large-scale hydropower plant in China. In view of the uncertainty of the optimal elastic coefficient of friction and the transfer mechanism of internal water pressure to the surrounding concrete, Spiral case with cushion layer of large-scale hydropower plant is simulated with ANSYS nonlinear finite element program, considering the slip contact characteristics between steel spiral case and the surrounding concrete, the more reasonable coefficient of friction between the steel spiral case and concrete is studied. This provides reliable theoretical analysis for the design of large-scale hydropower plants.
An Output Feedback Approach to Enlarging the Controllable Region for Systems Subject to Actuator Saturation
Authors: Zou Hong Bo , Feng Hui Hui , Zhao Xiao Dong
Published: August 2011

The problem of output feedback for the unstable discrete-time linear systems with input amplitude constraints is studied. Based on the precise description of controllable region, the typical implementation method of observer-based output feedback will decrease the system’s controllable region, a new approach is proposed in this paper, which make the system’s controllable domain as big as possible. Finally, two illustrative examples and simulation results are given to demonstrate the effectiveness of the proposed method.
Design and Development of Logistics and Transport Route Control System
Authors: Wang Ru , Tang San Yuan , Sun Wei Xin
Published: August 2011

According that town plan is mainly drawn with software AutoCAD, this article realizes to automatically select a shortest transport route on urban road and dynamically display traffic flow based on VC++ and ObjectARX and lays a foundation for future development taking traffic limit, traffic conditions and other complex conditions into account.
Application of BOTDR in Railway Fence Intrusion Detecting System
Authors: Gao Cen , Wang Feng , Li Cun Lei
Published: August 2011

The main purpose of railway fence monitoring is to prevent people and livestock impact, cross or damage the railway fence and avoid accidents. Fiber fence technique is a new type of perimeter intrusion sensor, which was developed in the 1990s’. It has overcome many drawbacks of the traditional perimeter intrusion sensor, and realized long distance, distributed, high sensitivity, high location accuracy, low false alarm rate perimeter intrusion sensing. This article proposed a railway fence monitoring system based on BOTDR(Brillouin Optical Time Doman Reflectometer), the response time of this system is 10s, the detection range is 5km, and the location accuracy is 2m within this range.
Research on Evaluation of Emergency Capability of City Gas Pipeline
Authors: Li Shi Gui , Li Xiao Ping , Liu Jing Cheng
Published: August 2011

Emergency capability is the key to control the development of gas pipeline, reduce the social loss, and protect the safety of city.city gas pipeline emergency capability evaluation index system is set up. The weight of the evaluation index would be analyzed by analytic hierarchy process, and then the fuzzy comprehensive evaluation index could be calculated through the establishment of a multi-level fuzzy comprehensive evaluation matrix. At last, the estimation scale of emergency capability of gas pipeline could be obtained.
Adaptive Fuzzy Sliding Mode Control for a Class of Nonlinear Dynamical Systems
Authors: Zheng Wen Da , Liu Gang , Yang Jie , Hou Hong Qing , Wang Ming Hao
Published: August 2011

This paper presents a FBFN-based (Fuzzy Basis Function Networks) adaptive sliding mode control algorithm for nonlinear dynamic systems. Firstly, we designed an perfect control law according to the nominal plant. However, there always exists discrepancy between nominal and actual mode, and the FBFN was applied to approximate the uncertainty. After that, the adaptive law was designed to update the parameters of FBFN to alleviate the approximating errors. Based on the theory of Lyapunov stability, the stability of the adaptive controller was given with a sufficient condition. Simulation example was also given to illustrate the effectiveness of the method.
Talk on the Investment Control of Engineering Project Supervisor in Construction Stage
Authors: Feng Hui Hong , Chen Jing Si
Published: August 2011

As the monitoring subject of construction engineering investment, engineering project supervisor plays a vital role in the investment control of construction stage. Based on the research by the construction supervisor about the construction phase of the investment control, this paper combined with engineering examples, and analyzed many reasons and key points that have influenced the investment control in the construction stage, and tracked out the investment control methods and measures aimed at each point that supervisor should do, thus to control the investment cost in construction stage effectively.