bluuebunny/crossref_metadata_2025 huggingface dataset:
Experimental Researches on Microstructure of Nanometer Silicon and Cement-Stabilized Soils
Authors: Wang Li Feng
Published: September 2011

Unconfined compressive strength of various mixing proportions and ages of nanometer silicon and cement-stabilized soils（NCSS） are tested ,and the rules of compressive strength are got. Hydration products and microstructures of NCSS are discussed by means of XRD and SEM technology, and microstructural mechanisms of NCSS are analyzed. Results show that nanometer silicon powder added to cement-stabilized soil(CSS) can sharply improve the compressive strength of CSS. More Calcium silicate hydrates(C-S-H) and other hydration products can be produced in the process of secondary reaction of cement and water added nanometer silicon powder. X ray diffraction tests indicate the kinds and quantities of C-S-H increase with nanometer silicon contents. Strengths of NCSS are bettered by increasing jointed strength changed from edge-edge, edge-face connectios to cementation connections affected by increasing hydration products. Large pores of NCSS can be greatly decreased by adding nanometer silicon powder, and hydration products filling in the pores make NCSS more dense materials.
A Method for Determining the Springing Displacements of Arch Bridges without Technical Data
Authors: Zhang Xiao Dong , Zhang Yong Qiang
Published: September 2011

A method for determining the springing displacements and arch axis of old arch bridges without technical data is presented. By minimizing the difference between the arch axis predicted by the finite element model and the one obtained by assumed arch equation, the optimization problem is formulated and solved. Two numerical examples are given and the results are discussed.
Forecasting Model of Short-Term Traffic Flow Based on Cloud Model
Authors: Liu Qin , Xu Jian Min
Published: September 2011

In order to improve the prediction precision of the short-term traffic flow, a prediction method of short-term traffic flow based on cloud model was proposed. The traffic flow was fit by cloud model. The history cloud and the present cloud were built by historical traffic flow and present traffic flow. The forecast cloud is produced by both clouds. Then, combining with the volume of the short-term traffic flow of an intersection in Guangzhou City, the model was calculated and simulated through programming. Max Absolute Error (MAE) and Mean Absolute percent Error (MAPE) were used to estimate the effect of prediction. The simulation results indicate that this prediction method is effective and advanced. The change of the historical and real time traffic flow is taken into account in this method. Because the short-term traffic flow is dealt with as a whole, the error of prediction is avoided. The prediction precision and real-time prediction are satisfied.
On Wavelets-Based Holder Exponents for Clamped-Clamped Beams Crack Identification
Authors: Bai Run Bo , Xu Hai Hong , Zhang Xin Xin
Published: September 2011

Structural damage detection by the Holder exponent receives much attention recently. Many investigations have been successfully applied to the crack identification, especially for the beam-type structures. However, a comprehensive analysis of the Holder exponent has been absent. Result in some conclusions had been drawn are unilateral. In this paper, the mode shapes of the clamped-clamped beams are analytical studied and a program calculating the Holder exponents of the mode shape signals with different damages is compiled with MATLAB. By comprehensively studying the Holder exponents of the clamped-clamped beams with cracks of different sizes, locations, and different order modes, a new phenomenon that the values of the Holder exponent vary with different locations of the crack is detected. The results also show that the Holder exponent decreases with the increase of the mode number. However, there are not obvious relations between the Holder exponent and the order of the mode for the whole beam locations.
Construction Technology Analysis of Space Heterotypic Steel Frame of Concert Hall in Changsha
Authors: Yang Wei Jun , Li Yao , Chen Fu Zhong
Published: September 2011

Many heterotypic steel frames with special-shaped are used in the concert of Changsha. It causes difficulties to the construction technology. Based on the characteristic, It is studied the construction process, then put forward the subsection lifting technique, applied energy analysis method for lifting point and used finite element analysis for supporting system. At the same time, it is used measuring robot 3d positioning method and elaborated the operation points, At last, it is analyzed the welding technology. All of these provide guarantee to the smooth construction.
Nonlinear Buckling Analysis of Hoisting with Application to Long-Span Steel Truss
Authors: Li Shun Guo , Li Hui
Published: September 2011

Nonlinear buckling analysis method using the finite element with application to Long-Span Steel Truss was studied is this paper. The finite element model of long-span complex steel truss hoisting was established and nonlinear buckling analysis of long-span complex steel truss hoisting for two hoisting points schemes was accomplished. The eigenvalues, eigenvalue buckling modes and nonlinear buckling analysis of two hoisting point’s scheme were analyzed. The results indicate that, the nonlinear buckling analysis method using the finite element is applicable approach to study the hoisting buckling problem, the buckling will be not occurring under hoisting stage only with gravity loads. The force status of long-span complex steel truss is improved under more hoisting point’s scheme and the lateral stability is strengthened.
Experimental Research and FE Model Analysis of Uniaxial Compression Ultimate Bearing Capacity on Concrete Filled Steel Tubular Columns
Authors: Chen Yan Jiang , Li Yong , Yan Wei Ming , Zhou Da Xing
Published: September 2011

Based on a prototype of a Concrete Filled Steel Tubular(CFST) column (D=1.2m, t=24mm) used in a practical engineering, specimens length-diameter ratio of which is 3:1 are designed to conduct the uniaxial compression experiment according to three scales which are 1:2.4, 1:3.6 and 1:4.8. FE model is established to simulate the loading process by means of finite element software ABAQUS. The study shows that the bearing capacity of test is much higher than the value calculated according to codes. It’s about 7% higher than the design bearing capacity calculated according to code CECE28:90. The outer steel tubes of CFST columns used in engineering are generally processed by wrapping and welding. The welding zone is easily to yield firstly when the CFST columns are under uniaxial compression, which can change the compression bearing state of the cross section to bias compression. As a result, the bearing capacity of the CFST columns would decrease to some extend.
Analysis of Impacts of Staircase upon Seismic Responses of Structure
Authors: Zhu Jie Jiang , Wang Cai Xia , Lee Yang
Published: September 2011

Staircase units have both active and hazard impacts on whole structure under earthquake. The existence of these impacts should not be neglected during designing process. Three sets of nonlinear finite element (FE) models of different types are finely built with and without staircase units, upon which dynamic earthquake analysis and pushover analysis are carried out to simulate the real earthquake disaster. Comparisons of overall properties, pushover performances, seismic response and internal force of elements are summarized and discussed between two models of a set. Potential dangerous elements are found while the reasons are generalized. Suggestions upon designing process are given as well.
Experimental Study on PC Beams Dynamic Performance of Prestress Degree under the Plane Charge Loading
Authors: Cheng Shou Yu , Yan Dong Jin , Li Yan Zhao , Zhai Jin Ming , Cai Qing Hua , Cui Can , Xu Guo Xing
Published: September 2011

By the method of plane charge on the tested beams, this paper studied 6 pieces of beams， dynamic performance by 4 time loadings, displayed the deflection waveform curves, measured the bearing ability of beams with different prestress degree, analyzed the effects of the deformed performance and the ductility of the test beams with the different prestress degree. The 6 pieces of PC（prestressed concrete）beams was divided into 2 groups.
A New-Type Bamboo-Steel Composite Structural Member, Box Section Bamboo-Steel Composite Beams
Authors: Lv Bo , Xie Qi Tie , Xu Jie , Jiang Tian Yuan , Li Yu Shun
Published: September 2011

Bamboo-steel composite structure contains all kinds of composite structural members, widen the applied range of bamboo and implement the diversification of component materials and forms in building structures. The paper presents a new-type box section bamboo-steel composite beams on the basis of I-section bamboo-steel composite beams, which take cold-formed thin-wall steel as the backbone, pastes bamboo plywood outer surface of steel sheet with structural adhesive, combines into box section bamboo-steel composite beams.
Experimental Study on Reinforced Hollow Beam with Carbon Fiber Reinforced Polymer and External Prestressed Strand
Authors: Zhao Shao Wei , Qiao Xian Ping
Published: September 2011

With the development of bridge reinforcement technology, various reinforcement methods has matured, however, just rely on a reinforcement method can not meet the current needs of the project. With carbon fiber reinforced polymer and external prestressed strand to reinforce hollow beam is a comprehensive and effective reinforcement method, we study the combined reinforcement mechanism of carbon fiber reinforced polymer and external prestressed strand through the true type hollow beam experiment, and lay the foundation for the promotion of composite reinforcement technology.
Design of the Columns of one Passenger Station in HongKong
Authors: Xi Hui Feng , Yang Wei Ping , Zhan Zhi Gui
Published: September 2011

A passenger station in Hongkong with a special structure whose roof is supported by nine mega columns which are linked in the middle by joints. The conventional design standard are inapplicable and alternatively for this structure, the design of the supporting columns of the passenger stations was verified by both finite element analysis and manual calculations. The results are consistent with each other.
Dynamic Elasto-Plastic Analysis on the Steel Spatial Arch Truss with 90m Span and 0.2 Rise-Span Ratio
Authors: Li Hai Wang , Guo Wei , Liu Jing
Published: September 2011

In this paper, the elasto-plastic dynamic analysis on the steel spatial arch truss with 90m span and 0.2 rise-span ratio is carried out under earthquake wave with SAP2000. In the analyses, the geometric and material nonlinear effects are considered simultaneously based on the plastic-hinge theory. Under the action of EL-centro wave with the peak increasing gradually, its elasto-plastic dynamic responses have been obtained. The results show that its failure mode under the earthquake action is elasto-plastic dynamic buckling; that its critical peak acceleration of EL earthquake wave when applied in X direction is 550gal, and is 675gal when applied in Z direction; The ratio of its maximal node horizontal displacement and its rise height is 1/635, and its displacement ductility coefficient is 1.262 and the ratio of its bars with plastic hinge appearing when buckling is 2.45% when EL-Centro waves applied on structure in X direction; The ratio of its maximal node vertical and its structural span is 1/99, and its displacement ductility coefficient is 19.207 and the ratio of its bars with plastic hinge appearing when buckling is 9.18% when EL-Centro waves applied in Z direction.
Double-Wall Cofferdam of Hero Bridge Calculation
Authors: Song Jin Bo
Published: September 2011

Hero Bridge is an extraordinarily huge bride across northern branch Ganjiang River, in the city of Nanchang. Main tower adopted single column slanted pylon space twist face back cable structure. Its construction is based on double-wall cofferdam method. The paper discuss thecalculation of key step and key position for the key technology in terms of double-wall cofferdam and platform underwater construction, Which include the design of the base construction and double-wall cofferdam,steel cofferdam construction, the calculation and checking of the cofferdam and so on.
Nonlinear Finite Element Analysis on Steel Reinforced Concrete L-Shaped Short-Shear Wall
Authors: Tang Hong Yuan , Lin Wei
Published: September 2011

This paper uses ANSYS finite element program to do the nonlinear finite element analysis on steel reinforced concrete L-shaped short-shear walls. Through applying the vertical and horizontal load on the model, three typical stages of the whole working period are studied. And the cracking load and deformation regularity in various stages are obtained. The development process of cracks until the specimen damaged is revealed. At last, the development process of crack distribution at different stages is studied.
Application of Super-High Fastener Steel-Pile Scaffold in High Slope Treatment of JINPIN Hydropower Station
Authors: Yuan Jian Jun , Liang Chuan
Published: September 2011

JINPIN Hydropower Station is a high arc dam of world class, and it is a difficult problem to set up scaffold in the treatment of high sloping of atomization region on two banks. Adopt fastener steel-pile scaffold combining with anchor wires, and set up the super-high working platform. This paper introduced the method of setting up the fastener steel pile scaffold, and special construction measures in the treatment of high sloping, which can be referential for scaffolding works.
Economic Evaluation and Decision Research on Urban Heating Mode in North
Authors: Ma Kun Ru , Wang Yi Jun , Wei Cui Xia
Published: September 2011

Based on urban heating situation in north, economic evaluation for different heating modes was analyzed in the presented work. Firstly through collecting and analyzing the urban heating system data, initial investment and operation cost were deduced for several main heating modes. And only fuel cost was taken into account in operation fuel cost for simplicity. Secondly economic evaluation for whole energy heating modes was done and compared. Finally the best heating mode was found which can be a reference for decision on urban heating mode in north.
Numerical Analysis of Long-Short-Pile Composite Foundation with Cushion or No Cushion
Authors: Sun Lu Yuan , Han Zhi Jun , Bai Xiao Hong
Published: September 2011

With the Drucker-Prager yield criterion, the ANSYS software is used to analyze the long-short-pile composite foundation by using three-dimensional nonlinear finite element method. The influences of load on axial stress and maximal axial stress of head of pile with cushion or not have been investigated by simulating composite foundation through nine long piles and sixteen short piles. The result indicates the cushion can reduce the stress concentration in head of pile effectively with increase of load. This conclusion has a certain value for engineering.
Anodic Removal of Chloride in Reinforced Concrete
Authors: Cui Yuli , He Hong Zhu , Shi Meilun
Published: September 2011

A method of removal of chloride in reinforced concrete was proposed by anodic oxidation of silver in the pore solution with chloride content over 0.4% by weight. The result shows that after anodic oxidation of silver plate the polarisation resistance of rebar will increase to the range of safety. The silver plate can be applied repeatedly.
The Tunnel Surrounding Rock Parameters Identification Method Based on PSO-ANN
Authors: Song Zhan Ping , Ren Song Bo , Guo Zhen Chao
Published: September 2011

Aiming at the complexity and uncertainty of rock and soil body, the paper proposed a tunnel surrounding rock parameters identification method combining numerical simulation, particle swarm optimization and artificial neural network. The method acquired data set between rock soil parameters and monitoring displacement and trained artificial neural network. The analytical theory and method are introduced in detail, analyzes the tunnel of Dalian Metro by the proposed method, and gets satisfied results. Which states that the parameters identification method based on PSO-ANN is feasible and has good foreground.
Mechanics Comparison between Hollow Floor and Solid Floor
Authors: Li Hai Tao , Deeks Andrew J. , Liu Li Xin , Su Xiao Zu , Huang Dong Sheng
Published: September 2011

In this paper both a hollow floor and the corresponding solid floor are analysed by using finite element software and the results are compared. The comparison is made through a detailed finite element study between a column-supported cast-in-situ hollow floor filled by tube with its solid counter-part. The orientation of the tube fillers causes the stiffness of the hollow slab to be orthotropic, potentially changing the distribution of load carrying between the two orthogonal directions. The inclusion of the hollows also potentially increases the flexibility of the slab. Recommendations for design of column-supported cast-in-situ concrete floors compared with the solid floor are then made with respect to distribution of design moments and calculation of deflections. Thus the reference was given to the designer.
Finite Element Analysis on the Joints of Multibarrel Tube-Confined Concrete Column
Authors: Zhang Dong Fang , Zhao Jun Hai , Zhang Yu Fen , Zhu Qian
Published: September 2011

Abstract：According to our team experimental study on the joints for the Multibarrel tube-confined concrete column and the reinforced concrete ring beam, The software ANSYS of finite element is used to simulate the behavior of connections in this paper. The simulated hysteretic curves and skeleton curves are compared with the experimental data and good agreement can be observed. Moreover, parametric studied have been carried out to investigate the influences of anchorage length of vertical steel bars for the nodes area, the strength of the concrete for the nodes area, the concrete strength of the frame beam, and the longitudinal reinforcement ratio of the frame beam on the skeleton curves.
A Decision Making Model of Laying Mode of Urban Rail Transit
Authors: Wang Xing Ju , Xi Xiao Ming , Gao Gui Feng , Chen Jin Jie
Published: September 2011

This study develops a blocked cost model of urban rail transit, which is applied to determine laying mode of urban rail transit. In addition, this model focuses on the laying mode choice of urban rail transit by using quantitative analysis, which is previously discussed by using qualitative analysis. The case of Line No. 1 of Shijiazhuang urban rail transit is given to demonstrate the blocked cost. The results show that the cost of urban rail transit on the ground is 0.372 billion RMB per km and the cost of urban rail transit underground is 1.79 billion RMB per km. The mode on the ground is the best solution due to its low cost. But by analyzing and evaluating generalized cost in which blocked cost has been considered, the mode of urban railway transit underground is the best choice due to 1.79 billion RMB per km compared to 1.91 billion RMB per km on the ground.
Calculation of Shear Lag in Cantilever Box Girder with Constant Depth
Authors: Dong Yu Li , Liu Guang Yi , Lv Jun Li
Published: September 2011

The physical explanations both of positive or negative shear lag are given in this paper. The shear lag effects occur attributing to the abrupt change of shear stress at junction upper the web. The abrupt change of shear stress or called shear stress jump changes the stress magnitude of the flange bending stress, which attenuates gradually at increasing distances from the web. Meanwhile, the abrupt change of shear stress from zero to the flange shear stress also influences the bending stress state at the centerline of the slab. The method to determine the shear lag has given, which is based on the Euler-Bernoulli elementary theory of bending. Considering the transversal distribution of the shear stress at the junction upper the web, the real flange bending stress could be calculated all on the section.
Analysis for the Stability of Irregular Wedge on Slope and its Engineering Application
Authors: Rong Guan , Zhang Bo Tao , Wang Xiao Jiang
Published: September 2011

Energy dissipation equation is obtained from the virtual work principle. By assuming different initiative sliding directions, methods of upper bound solution and classical solution for rock wedge stability are deduced. The computational formulas of safety factor indicate that the safety factor of wedge is depended on the areas of sliding surfaces and the volume of the wedge rather than the shape of the slope when the attitude and strength of discontinuities is given. Therefore the current wedge method can be improved to overcome the weakness that the current method is inapplicable when the slope shape is greatly rugged and the wedge is surrounded by more than three discontinuities. As an example, the improved method is applied in the left bank slope of Baihetan hydropower station. The calculation results obtained by the improved methods is more reasonable and credible.
Finite Element Model for Cracked Beams with Bonded Piezoelectric Transducers
Authors: Yan Wei , Li Wan Chun , Wang Wei
Published: September 2011

Based on the finite element software ANSYS, an electromechanical impedance (EMI) model for a cracked beam with imperfectly bonded piezoelectric patches is established in the paper. The property of bonding layer between the PZT sensor/actuators and the host beam is taken into account and thus the three-dimensional (3D) model of piezoelectric patch-adhesive-cracked beam coupled system is developed. Comparison with existing numerical results validates the effectiveness and accuracy of the present analysis. Then, parameter study is conducted by considering effects of the vibration mode of the host beam, the mass density of the adhesive and crack depth etc. on EMI signatures. The numerical results indicate that the present EMI model can be used to detect the cracks in the structures.
Numerical Simulation of Fire Resistance Performance for Planar Frame with Concrete Filled Steel Tubular Columns and Steel Beams
Authors: Yin Yan , Li Tang
Published: September 2011

In this paper, the fire resistance performance of the unprotected two-layer and two-cross planar frame, which is composed of concrete filled steel tubular columns and steel beams, was analyzed under local fire by ANSYS. After analyzing the structure with the method of hot - structural coupling using standard heating curve ISO-834, some consequence were obtained such as the regularity of temperature field distribution of beams and columns and the fire endurance and critical temperature of the structure. It turned out that the bottom flange at the end of the beams appeared local buckling when the structure reached the limit state by fire, and the first plastic hinge appeared at the end of beams. Furthermore, because the horizontal displacement of column is small, the overall collapse of structure can be avoided effectively.
Study on the Chemical Properties of Toona Ciliate
Authors: Gao Zhen Zhong , Zhu Yuan , Wang Xiao Jing , Lin Yan , Wang Xiao Bo , Sun Jin
Published: September 2011

Toona ciliata, fast-growing timber species, located in the tropical and subtropical region. In order to explore how to make better use of Toona ciliate, its chemical composition was investigated in this paper. The results show that: Cold water extractive was 1.02%. Hot water extractive was 3.39%. 1% sodium hydroxide extractive was 15.45%. Ethanol-benzene extractive was 1.53%. Content of cellulose was 48.35%. Content of acid-insoluble lignin was 24.92%. Content of holocellulose was 76.45%. Content of hemicellulose was 28.1%. pH value of wood was 6.33. Through comparing with other species, high content of cellulose and low content of extractive suggested that Toona ciliate was ideal material for pulping and board making.
An Overview on the Blast Loading and Blast Effects on the RC Structures
Authors: Sun Wen Bin , Jiang Yang , He Wei Zhong
Published: September 2011

An explosion is defined as a large-scale, rapid and sudden release of energy. Explosions, such as a bomb explosion within or immediately nearby a building and a gas-chemical explosion, can cause catastrophic damage on the building's frames, collapsing of walls, blowing out of large expanses of windows, and shutting down of critical life-safety systems. In fact, an explosion may result in large dynamic loads, greater than the original design loads, of many structures. Blast phenomenon and blast efforts have been made during the past several decades to develop methods of structural analysis and design to resist blast loads. The analysis and design of structures subjected to blast loads require a detailed understanding of blast phenomena and the dynamic response of various structural elements. This paper introduces different methods to estimate blast loads, also presents a comprehensive overview of the effects of explosion on RC structures.
Implementation of Structural Control with Viscous Damper
Authors: Hsu Deh Shiu , Lee Yung Feng , Huang Ping Cheng , Wu Yu Ching
Published: September 2011

For the sake of safety of structures subjected to abnormal loadings, damper could be one of the effective devices to reduce the responses by the energy dispassion functions. Key points in the process of development and application of damper and aseismatic engineering are narrated. Due to the highly nonlinear behavior properties, most of the case studies aim on these kind of dynamic analysis only working on structures with elastic linearly behavior systems. In addition to the nonlinearly behavior of damper devices, structures behave into nonlinearly as well when subjected by abnormal excitation, for instance, severe earthquakes. Materials respond into nonlinearly beyond yielding or plastic hinges occurred somewhere in the controlled structures. Proper software package is used to calculate the responses of simple portal frames which are controlled with dampers allocated. Both of structures and damper devices are considered and behaved according to its nonlinearly properties. Responses beyond yielding of material are rationally analyzed and revealed in time history expressions.
Dynamic Response and Failure Modes of Concrete Slab under Blast Load
Authors: Li Qiao Yan , Yu Gai Hua , Guo Xiao Yun
Published: September 2011

The impact of blast load is always taken into consideration in significant building and protective construction. In order to study the mechanical behavior of the concrete slab under blast load, the dynamic responses of a square concrete slab under surface explosion are simulated by the nonlinear finite element program ANSYS/LS-DYNA. The JOHNSON_HOLMQUIST_CONCRETE model is used for concrete material and the damage and strain rate effect are considered in this mode1. The simplified exponential load is used as blast load. The Z-displacement,Mises effective stress and damage state of concrete slab under different blast load of corresponding scaled distance are investigated and discussed. It can be found from the results that the influence of blast pressure can be neglected when scaled distance is around 2.0 and the damage of slab is beginning from the edge.
Optimization of Reinforced Concrete Tall Buildings Using a Hybrid Genetic Algorithm
Authors: Lu Hai Yan , Guo Xiao
Published: September 2011

Tall buildings play an important role in the modern urban city, where only a few lands are available for the increasing population. In this study a hybrid genetic algorithm (GA) and optimality criteria (OC) method is presented for the optimum design of tall buildings under multi-load cases based on the current Chinese design codes. The entire optimum design procedure is divided into two parts: strength optimum design and stiffness optimum design. Member depths are treated as design variables. A GA with the strategy of adaptive feasible region is proposed to perform the discrete optimization of tall buildings under the strength constraints with the results of the stiffness optimum design as the lower bounds of the member size. The optimum stiffness design is conducted using OC method with the results of the strength optimum design as the lower bounds of the member size. This procedure is repeated until convergence is obtained. A design example is optimized to demonstrate the practicability and effectiveness of the proposed method
Study on the Frame Structure under Nonuniform Settlement
Authors: Zhao Dong Mei , Zhao Ying Xu , Ye Yan Xia
Published: September 2011

In this paper, the effect of the non-uniformity settlement of ground foundation on the upper frame structure is studied. It takes a four-story space frame structure with two spans as an example. The different pedestals are installed at the joint of column footing, which respectively form the fixed supported model and the elastic supported model. Basin shaped settlement is applied in each model. The result shows that the beams are principally suffered with the bending moment and the columns principally suffered with axial force, shear force and bending moment, and that the elastic support model has certain economy.
An Overview of Signal-Based Damage Detection Methods
Authors: Qiao Long , Esmaeily Asad
Published: September 2011

Deterioration of structures due to aging, cumulative crack growth or excessive response significantly affects the performance and safety of structures during their service life. Recently, signal-based methods have received many attentions for structural health monitoring and damage detection. These methods examine changes in the features derived directly from the measured time histories or their corresponding spectra through proper signal processing methods and algorithms to detect damage. Based on different signal processing techniques for feature extraction, these methods are classified into time-domain methods, frequency-domain methods, and time-frequency (or time-scale)-domain methods. As an enhancement for feature extraction, selection and classification, pattern recognition techniques are deeply integrated into signal-based damage detection. This paper provided an overview of these methods based on two aspects: (1) feature extraction and selection, and (2) pattern recognition. Signal-based methods are particularly more effective for structures with complicated nonlinear behavior and the incomplete, incoherent, and noise-contaminated measurements of structural response.
Application of Constructing Three-Dimensional Model Using Laser Scanning Technology
Authors: Liu Wen Long , Zhao Xiao Ping , Xu Bao Guo
Published: September 2011

Starting from the principle of three-dimensional laser scanner and after analyzing the positioning error of point cloud, in this paper the following key problems confronted in data processing are researched ,the problems are range image segmentation, point cloud registration, point cloud filtering, absolute positioning and stitching data, modeling in AutoCAD or 3Dmax. Then, examples were introduced in constructing three-dimensional model using laser scanning technology. The results showed that the use of this technology can provide high-precision building models, which is important in constructing three-dimensional models and very helpful of digital cities.
Study on the Static Stability and the Ultimate Bearing Capacity of Vierendeel Latticed Shells
Authors: Du Wen Feng , Zhou Zhi Yong , Yu Fu Dong
Published: September 2011

Studies on the static stability and the ultimate bearing capacity of vierendeel latticed shells have been carried out. The buckling modal and the whole course of instability are shown using the Finite Element Method. The ultimate bearing capacity is compared with that of the single-layer latticed shell structure. The results show that the ultimate bearing capacity of the vierendeel latticed shells is 2.87 times more than that of the single-layer lattice shell in the condition of consuming the same steel. The vierendeel latticed shell structure not only has the advantages of concision and transparency like the single layer latticed shell structure, but also has the stability and carrying capacity like double-layer latticed shell structure.
The Effect of Soil Structure Interaction on the Seismic Response of Spatial Structure Subjected to the near Fault Ground Motion
Authors: Luan Xiao Bing , Xue Su Duo , Li Xiong Yan
Published: September 2011

This paper is to analyze the seismic response of the spatial structure supported by the column subjected to the near fault excitation. Three analysis models, such as fix base model, the SSI model without considering the radiation damping and the SSI model considering the radiation damping, are analyzed simultaneously subjected to the near fault excitation. The statistical analysis is carried out for the displacement at the mid-span, the axial force of the upper chord, the web and the bottom chord for the models.
Study on Flexural Performance of Damage RC Beams Strengthened with near Surface Mounted FRP Strips
Authors: Dong Chang Zhou , Xia Jian Zhong
Published: September 2011

The contrast tests of 1 reinforced concrete(RC) beams and 4 RC beams strengthened with near-surface mounted carbon fiber reinforced polymer (FRP) strips have been carried out, under conditions of different damage degree of RC beams. It is mainly conducted to investigate the effects of FRP strips reinforcement of flexural strength. The experimental results indicate that significant strength on the ultimate load and rigidity of reinforced concrete beams can be realized by mounting FRP strips to the beams, and propagation of cracks were reduced obviously.
Proposed Design Method of Combined Connections with Bolts and Longitudinal Welds
Authors: Shi Yong Jiu , Wang Lei , Wang Yuan Qing , Ma Jian Suo , Bai Run Shan
Published: September 2011

The combined connection with welds and bolds can be widely used in reinforcing the joint in steel structure. In this paper, proposed design method of combined connection with bolts and longitudinal welds was given based on the tests and finite element analysis (FEA). The method considers the effect of the strength ratio between bolts and welds. The safety and reliability of the method were verified by FEA and comparison with other design method. The design method can contribute to the promotion of the application of the combined connections.
Analysis of Optimum Structural System and Mechanical Behavior of Fine Sand Filling Embankment
Authors: Zhang Hai Xia , Meng Guang Li , Lv Yue Jing
Published: September 2011

It is serious problem of the deficiency of high quality embankment filling in the expressway construction in shanghai, the Yangtze estuary fine sand has been extensive applied as the substitute filling material to avoid destroying the cultivated land and cropland. It is signality of the fine sand filling embankment technique popularization and application to the improvement of highway construction level, the protection of the cultivated land and the protection of the eco-environment. For the natural sand is no-viscous bulk solid material with great variation on mechanical properties to traditional embankment filling, now there are some problems on the application of fine sand filling embankment engineering haven’t been analyzed such as the standardization of highway optimum structure system and road performance of fine sand filling embankment. In the paper, it analyzed the fine sand filling embankment stability by considering with the shape of landslide and safety factor by using the combination method of the strength reduction method and Fast Lagrange method. The analysis included geometrical and material properties of the slope ratio, the subgrade height, the presence or absence of the surrounding soil and the thickness of it, the top seal coat, pavement structure etc. and proposed the design suggestions of the optimum fine sand filling embankment based on the analysis above.
Overall Stability of Cold-Formed Steel Lipped Channel Axially Compressed Members with Batten Plates
Authors: Sun De Fa
Published: September 2011

Batten plates can play a significant role in reducing the bearing capacity of the entire component and preventing the upward warpage deformation in the opening section. The specific number of batten plates should be calculated for the open cold-formed thin-walled steel structure. By theoretical analysis, this study develops the flexural-torsional buckling formula for the open lipped-channel section cold-formed thin-walled axially compressed members with batten plates. The calculating results show that, according to the configuration rule with 80 iy space between batten plates along the opening direction in the open thin-walled steel members, the warpage deformation will be effectively prevented in the opening direction. Besides, the bearing capacity of the entire member will be increased. The proposed calculation methods can actively complement the existing code.
The Experimental Study on Concrete-Filled Thin-Walled Square Steel Tube Short Columns Fixed U-Shaped Steel Bars
Authors: Wang Hai Chao , Xu Xi Quan , Zhou Li Jun , Zhang Hong Ying , Yang Feng Lian
Published: September 2011

Based on the compression characteristics of the concrete-filled thin-walled square steel tube short columns, the U-shaped tie bars are designed in this paper. The U-shaped tie bars and steel pipe walls are connected with each other in T-shape in order to enhance the local stability of the walls under pressure. According to the concrete strength C30/C35/C40 and the thickness of the steel plates 1.25mm/1.75mm/2.5mm,42 short-column specimens are made, and the size of all specimens is 200mm×200mm×690mm.The bearing capacity test is done by the 500-ton electro-hydraulic serve testing machine. The strain of U-shaped tie bar and thin-walled steel are tested, and then the whole curve of compression process is obtained. The results show that the U-shaped tie bar has a very good role in bonding, and has good effects on improving buckling mode and the ductility of the components significantly. Concrete-filled thin-walled square steel tube short column fixed U-shaped tie bar has advantages on stronger post- deformability and more applicable to configuration compared with existing research achievements, and can provide a reference for engineering design.
Optimization and Analysis on Cable Net Structure Supporting the Reflector of the Large Radio Telescope FAST
Authors: Jiang Peng , Wang Qi Ming , Zhao Qing
Published: September 2011

Five-hundred-meter Aperture Spherical radio Telescope (FAST) is designed to be supported by geodesic form cable-net structure which is suspended from the ring beam. Based on the initial design, the present work has performed a further optimization to reduce the types and quantity of the connections between the cable-net and the ring beam. Furthermore, the finite element model has been established to study the influence of the deadweight of the reflector element on the force distribution of the cable-net structure, and the sensitivity of angle deviation of down tied cable to the control accuracy of cable net deformation has also been discussed.
Pushover Analysis and Dynamic Response under Earthquake for a Continuous Rigid Frame Bridge
Authors: Chen Xing Ye , Tang Xue Song
Published: September 2011

Abstract. Based on the concept of energy design, pushover analysis and elastoplastic dynamic response have been made under the earthquake. It is seen that the loading mode plays an important role in the pushover analysis. The loads in the pushover analysis distribute along the height of the structure that should reflect the distribution of the inertial forces under the earthquake so that the calculated displacements have a good accuracy in contrast to the real displacements. Only in such a way, the result by pushover analysis method is credible. On the other hand, it is found that the high order vibration modes can not be neglected in the pushover analysis for a continuous rigid frame bridges with long span and high piers. However, the bridge design codes have not told how to consider the effect of high order vibration modes. A simplified loading mode is then proposed in this work. A contribution ratio of vibration mode is defined to indicate whether the vibration mode should be considered or not in the pushover analysis. The proposed loading mode is applied to a real continuous rigid frame bridge with large span and high piers. The dynamic response and aseismatic property are evaluated and discussed. In addition, the results by pushover analysis are compared to the results by non-linear time-history analysis. The result shows that the high order vibrational modes indeed have a pronounced influence on the result. The proposed loading mode can give a reasonable result.
Location Analysis for Dry Ports Based on FCM
Authors: Chang Zheng , Lu Jing , Qi Zhuang
Published: September 2011

This paper deals with the problem of optimally locating dry ports for seaport. Evaluation system for dry port location decision is established and FCM is applied to solve the problem. The model is used to select optimal location for inland terminals of port Tianjin in China. It is shown that among the direct hinterland of the seaport, Beijing is most suitable for operating dry port, there are also eight inland cities as alternatives. According to the result comparison, industry transfer and relevant policy tendency should also be considered when make the dry port location decision.
Research on the Urban Transportation Development in Our Country Based on the Traffic Congestion Pricing
Authors: Kou Wei , Cheng Lin
Published: September 2011

With the development and realization of industrialization and urbanization in the world, urban traffic volume grows rapidly; many big cities face more and more serious traffic problem. As a mean of traffic demand management, traffic congestion pricing has important significance in theory and practice. Traffic congestion pricing can counteract external diseconomy caused by network congestion, and the price of congestion is tantamount to the difference between social marginal cost and private marginal cost. This paper analyzes the economic theory of congestion pricing. Combined the effect of traffic congestion pricing that implemented in the developed countries, it researches the influence of urban transportation development in our country in the future based on the implementing congestion pricing.
Developing Seaport Logistics in Weifang Binhai Economic-Technological Development Area: SWOT Analysis
Authors: Liu Wei
Published: September 2011

In the framework "one city, four park" of Weifang BEDA, an idea to construct an 80-km seaport logistics park has been under discussion, which will bring opportunities to develop seaport logistics. The purpose of this study is to analyze the strength, weakness, opportunity and threat in developing seaport logistics in Weifang Binhai Economic-technological Development Area by using SWOT analysis method, and also some policies and suggestions has been given in this article.
Study on Temperature Field of Low Heat Accumulation Asphalt Concrete Pavement
Authors: Li Zhen Zhen , Xie Jian Guang
Published: September 2011

Experimental results showed that low heat accumulation asphalt mixture had a marked effect on the reduction of surface temperatures. However changes in temperature over the test methods were not thoroughly studied. In the process of test, LJ infrared powder is used to prepare for making the content of 6% asphalt mixture specimen. Several temperature data of infrared powder specimen were compared with the data of ordinary specimen. Each number was compared and analyzed. At last, concrete temperature variation discipline of the temperature field was found.
An Improved Switching Table for PMSM DTC Drive Used in Electrical Vehicle
Authors: Meng Yan Jing , Li Yao Hua , Wang Meng Xiao
Published: September 2011

The DTC for PMSM possesses many advantages: simple control configuration, lesser parameters dependence and fast dynamic response and is a good choice for the drive of EV. But the DTC suffers from high torque ripples. The switching table is used as the hysteresis control rule that determines the control performance. An improved switching table is proposed based on effects of voltage vectors on the drive. Simulation results show this switching table can suppress torque ripple compared to the conventional switching table.
Based on the Sustainable Development of Urban Transport Planning and Management
Authors: Gao Zhi Min , Liu Fa Sheng , Chen Meng
Published: September 2011

Along with social economy's swift development, the urbanization and the motorization advancement also speed up along with it, and brought the huge challenge for the municipal transportation. The altitude systematic characteristic is not only the municipal transportation bright characteristic, but also the substantial clause which transportation domain many questions difficulty with govern. The municipal transportation sustainable development question has become the key point and the difficult question of domestic and foreign sustainable development domain. This paper through the transportation plan and the urban planning interaction development, gives priority to the urban mass transit, the implementation transportation requirements management, optimizes the municipal transportation network, realizes the sustainable development, thus establishes the urban low-carbon transportation system.
Maintenance Technologies Research of High Speed Turnout
Authors: Xu Hao , Wang Ping , Liu Dan , Xu Jin Hui , Chen Rong
Published: September 2011

Turnout, where a train changes its running track, is one of the crucial technologies in China’s high-speed railway construction, turnout is always the important and difficult to maintenance. In order to keep the high technology of turnout and reduce the maintenance work, we based on the experience of accumulated from the design, manufacture and laid technology of high speed turnout, and the scientific maintenance method of high speed turnout was explored. Maintenance of high speed turnout should be in accordance with its high performance requirements and take appropriate measures of maintenance to ensure the high speed turnout working safely.
Calculating PA Matrix of Transit Trip from Passenger Flow Volume
Authors: Liu Yong
Published: September 2011

This paper presents an approach to calculate PA matrix of transit trip from passenger flow volume. This approach is based on inverse calculation of distribution matrix by observing traffic flow and the characteristics of public transit planning in practical investigation is taken into account. It also suggests the method to test the accuracy of final matrix.
The Implementation Mode of Urban Rail Based Transit Joint Development — Experiences from United States, Japan and Hong Kong
Authors: Sheng Lai Fang , Rong Chao He , Song Yan
Published: September 2011

The urban rail based Transit Joint Development (TJD) has become one of the most important financing channels for constructing urban rail transit systems in China. Compared to the extensive research and application in planning field, the implementation of TJD still faced some difficulties such as organizational model selection, distribution of benefits and so on. In the 1980s and 1990s, the United States, Japan and Hong Kong developed a series of TJD practices and they formed three kinds of TJD mode: Public-Private Partnership, Enterprise Oriented, and Franchise. Empirical evidences have shown that differences among three modes are mainly reflected in the selection of implementation agency, allocation of functions and distribution of benefits. Then these distinctions will cause various impacts on the scale, cycle, form and operational management of TJDs. The conclusions of this research could provide valuable experience to the ongoing work of TJD in Chinese mega cities.