bluuebunny/crossref_metadata_2025 huggingface dataset:
Study on Scheduling Design of TTCAN Protocol of Fuel Cell Bus
Authors: Ming Hong , Quan Rui , Quan Shu Hai
Published: June 2011

Fuel cell buses are the research focus all over the world, how to develop the application layer protocol of the powertrain systems is a key technique. According to the cummunication requirement of the powertrain system of 60kW fuel cell middle bus designed by our group, the time triggered CAN(TTCAN) protocol based on SAE J1939 was designed in this paper. In which, the redundant CAN Buses topology structure of powertrain system was established, then the source address, output parameters and parameter groups of each node were defined, and the TTCAN matrix was scheduled with average-loading algorithm. Finally, the analysis and testing results related to the schedulability, real-time capability, period dithering and bandwidth utilization performance were presented, which prove the good effect and validity of the method adopted in this paper.
Dynamic Response Analysis of Column-Supported Silos
Authors: Ding Yong Gang , Wang Jian Qiang , Cheng Yu , Fan Ling
Published: June 2011

In consideration of the deficient study on dynamic response of reinforced concrete silos, especially group silos at home and abroad, taking the silos of one grain storage for instance, the dynamic response analysis of a single column-supported silo and that of group silos are carried out and contrasted through finite element method. Then the analysis results are contrasted with corresponding standards as well as academic studies.
Pondering over Water Conservancy Measurement Combined with Schistosomiasis Control
Authors: Chen Biao , Chen He Chun , Yan Tao
Published: June 2011

In recent year,the epidemic situation of schistosomiasis has been recurring, the spreading of oncomelania is obvious, and the schistosomiasis problem is quite serious in Yangtze river basin. In such case, kinds of water conservancy measurement combined with schistosomiasis control are introduced. Considering that various measures of oncomelania interception are mainly suitable for low-head project, the reliability is poor and the management operation is with high difficulty at present, the technology of interception of oncomelania snail with hydraulic separation which is suitable for high-lift and medium-head (3meters) projects and the technology of interception of oncomelania snail with net cage that can be applied to low-head projects are proposed. According to the research, we can discover the interception of oncomelania snail with hydraulic separation oncomelania snail and the interception of oncomelania snail with net cage is efficient in intercepting oncomelania snail, and can be applied to practical projects.
Experimental Study for the Strength with CFRP in Small Eccentric R.C. Column
Authors: Liu Zheng , Sun Jun , Tao Yan , Li Qian
Published: June 2011

This paper mainly studied of the carbon fiber reinforced plastic (CFRP) reinforced concrete columns to improve its capacity．First，the CFRP strengthened concrete columns reinforced by the force derived mechanism to improve the theoretical foundation of the bearing capacity. On this basis，study of eight reinforced concrete columns were tested. The actual strength reinforcement component results compare with the theoretical results, this paper got the law of the CFRP reinforced small concrete columns, provided a reference for project．
High-Strength Concrete Structure Strengthened with CFRP: Experimental Study and Nonlinear FE Analysis
Authors: Hai Hong , Zhao Ying Hua , Sun Li Ye
Published: June 2011

This paper deals with high-strength concrete structure with carbon fiber reinforced plastic (CFRP) strips bonded to the shear face. The first part deals with an experimental study. The fiber reinforced plastics strengthened concrete member test presents a failure mode with debonding of the external CFRP strips from the concrete member. The second part deals with a nonlinear FE analysis with LS-DYNA . Considering of the adhesive layer, explicit finite element is used for simulating the shear failure of CFRP-strengthened concrete, obtain the whole process of structure deformation development and describe the conformation and development of crack and the failure mode. The FE results are compared with the experimental results.
Efficiency of Discrete Glass Fiber Reinforced Cement Mortar in Compression
Authors: El-Kariem Ata , Shoeib S.
Published: June 2011

The cement mortar with glass fiber (GF) can be widely used in strengthen different structure elements. In general, discrete glass fiber was used for improving the tensile strength of mortar. In article, the optimum material contents (sand, cement, water and fiber) enhancement compression strength with tensile strength was investigated. Forty-two specimens are tested after 28 days. Each specimen has of 3 cubes 15*15*15 and the average results were taken into consideration. The mortar content is cement, sand, water and discrete glass fiber. The fiber lengths (L f) are 20, 35, 50 mm. the fiber contents ( Vf ) are 1.5%, 3.0% and 4.5%. The water cement ratios (W/C) are 0.47, 0.42, and 0.37. The cement sand ratios (C/S) are 1:2, 1:3 and 1:4. The results show that, b y reducing the C/S ratio, the discrete glass fiber used is not recommended using. Moreover, from the experimental studies, the curves required for awareness the mixed material of mortar with discrete glass fiber were plotted. The theoretical equation that can be used in the initial trial mixing design is determined. This type of mortar can be successfully used for repairing or strengthen brick wall, or replaced instant of steel mish for resistance change temperature between wall layers.
Evaluation of Asphalt Emulsion for Use in Warm Mix Asphalt
Authors: Du Jia Chong , Chang Kai Chueh
Published: June 2011

Temperature grows up and climate changes year by year as result of global warming. One of the main reasons is the carbon dioxide emission. How to overcome global warming effect by means of energy conservation and carbon reduction is one of the important subjects and one of government's important administrative policies. Nowadays, the price of the international crude oil raised causes the price of the asphalt and ignition oil going up. Warm mix asphalt (WMA), a new-type mix asphalt technology, which has the characteristics of environmental protection, energy conservation and good workability is from Europe. Compared with Hot mix asphalt (HMA), the properties of the WMA is same as the HMA. Thus, the technology of WMA with emulsion asphalt mixture under energy conservation, carbon reduction, and cost reducing by way of temperature control, is introduced by this study in order to change the traditional HMA. The study used dense-graded aggregate with three nominal maximum aggregate sizes (NMAS) of 9.5mm, 12.5mm and 19mm is tested by indirect tensile strength, moisture sensitivity and permanent deformation test for evaluation and the results will be for reference of the HMA mix plant factories.
The Nonlinear Viscoelastic Behavior for Asphalt Mixture Materials
Authors: Ye Yong , Cai Yi Zhou
Published: June 2011

Compressive behavior of asphalt mixture is studied in creep and strain recovery tests observing large nonlinear viscoelastic strains. The nonlinear viscoelastic material model for asphalt mixture is presented, based on a modified version of Schapery’s constitutive relationship. For the description of the nonlinear viscoelastic response of the material, simple creep and recovery tests for different stress levels were executed. An analytical method and a nonlinear fitting procedure by the least square method are developed to determine nonlinear viscoelastic stress dependent parameters. Constant stress creep testing were also performed to validate the developed material model. The model successfully describes the main features for asphalt mixture and shows good agreement with test data within the considered stress range.
Validity Evaluation of Different Laboratory Asphalt Concrete Material Compaction Methods with Digital Image Processing Technique
Authors: Yu Jiang Miao , Li Zhi , Zhang Xiao Ning
Published: June 2011

The digital image processing technique was applied to analyze and evaluate the coarse aggregate orientation property in asphalt mixture specimens. Specimens produced by Marshall compaction, vibratory compaction, gyratory compaction, and roller compaction were separately evaluated and compared with the core samples drilled from real asphalt pavement. The quantitative index named maximum likelihood angle (MLA) was developed for statistical analysis on the coarse aggregate orientation. It is found that the coarse aggregate orientation properties of the specimens using different compaction methods have great differences, the specimens produced by laboratory Marshall compaction method has no statistical discipline, the specimen produced by laboratory roller compaction method has the best similarity property with the real asphalt pavement. The results indicate that the MLA is an effective index in evaluating the aggregate orientation, and the roller compaction method should be the first choice in laboratory asphalt mixes specimen preparation.
Research on Gradation Design of Asphalt Mixtur in Tropical Climate Region
Authors: Hu Ming Wu , Zhou Yi Tang , Li Luo Ke , Wang Yi Na
Published: June 2011

According to the stage filling theory and particle interfering theory, a new parameter “q” was put forward. The “q” was come from other 3 parameters of Bailey method, which are CA, Fac and FAf, it is used to represent the internal composition of coarse aggregate. Focus on the tropical climate condition of Xishuangbanna which is located in Yunnan Province China, the gradation design and performance of asphalt mixture were in-depth studied. It is concluded that the “q” has an significant effect on the volumetric properties and pavement performances. When the “q”of AC-25 asphalt mixture ranges from2~5, the coarse aggregate is more easier to formed into skeleton, its resistance capability of high-temperature rutting and water damage are very good, and this kind of asphalt mixture can meet the challenge in tropical climate region.
Correction Factor of Surface Deflection for Inverted Asphalt Pavement Based on Linear-Anisotropy
Authors: Li Zhen Feng , Guo Xiang Yun , Zhang Ming
Published: June 2011

Inverted asphalt pavement has been widely used in practical application. Anisotropy of granular material has been proved by experiment, but the current design specifications are also based on isotropic theory. Based on linear-anisotropic model, on the condition of the high, medium and low strength of soil subgrade, 4 different thickness of asphalt layer and 3 different thickness of granular sandwich are been systematically studied, the results show that, the strength of the soil subgrade has bigger effect on the pavement deflection, the deflection difference of the low to the high subgrade is about 14~23%, with the increase of granular material anisotropy, the deflection correction factor is bigger, with the granular sandwich anisotropic rates from 0.1 to 0.5, the deflection correction factor is within 1.04, the thin asphalt layer and the thick granular sandwich have bigger effect on the deflection correction factor, for the common inverted asphalt pavement structure, the proposed deflection correction factor is 1.02~1.04, it can be used directly in asphalt pavement design.
The Implementation and Assessment of the Nonlinear Finite Element Method Based on the Chord Modulus in Loess Subgrade
Authors: Li Rong Jian , Zheng Wen , Duan Hao , Che Gao Feng , Jiao Wu Yi
Published: June 2011

The chord modulus method mostly used in the layer-wise summation method to evaluate the total settlement of subgrade at present. In order to analyze the deformation field, it is necessary that one of key problem should be considered and solved how to use the chord modulus to implement the computation of the finite element method. Firstly, this paper reviews the characteristics of chord modulus theory. Secondly, the solution how the chord modulus is introduced into the finite element method is discussed, and subsequently the corresponding nonlinear finite element codes are developed. The computational results show that the nonlinear finite element method based on the chord modulus should be recommended owing to its potential application that it may consider the deformation field of the whole subgrade.
Application of WMA on Thin Overlay on Airport Cement Concrete Pavement
Authors: Weng Xing Zhong , Jia Jian Qiang , Yan Xiang Cheng , Jia Jian Zhong
Published: June 2011

Considering the hot mix asphalt compaction quality is difficult to reach and it can be destroyed easily, the warm mix asphalt is used for thin overlay of airport cement concrete pavement. The mixture proportion of warm mix asphalt was designed, the performance of the base asphalt and the modified emulsify asphalt were measured, and the optimum asphalt quantity was determined, then the performance comparison between warm mix asphalt and hot mix asphalt were analyzed. Results indicate that warm mix asphalt has the same performance with hot mix asphalt, it can also satisfy the requirement of the airport cement concrete pavement thin overlay. Finally, in order to validate the project application effect, the warm mix asphalt was used in a northwest airport cement concrete pavement thin overlay. After four years use, the construction of the pavement is in good condition, and no disease emerging, the performance can meet the using requirements of the airport.
Large Eddy Simulation of Hydraulic Characteristics after New Lateral Aerator
Authors: Li Guo Jing , Dai Guang Qing , Yang Qing , Ma Xu Dong
Published: June 2011

The simulation of hydraulic characteristics was carried out with Larger Eddy Simulation (LES) and Volume of Fluid (VOF) method. The numerical results show that the flow condition is smooth, the length of lateral cavity gradually increases with the size of lateral enlargement increases, the maximum pressure value on the lateral wall appears after the bottom cavity, the upper part of the lateral cavity region was longer than the lower part due to gravity and the backwater does not intrude into bottom cavity. The numerical results agree well with the experimental date. The new lateral aerator has good hydraulic characteristics and the LES with VOF method can well predict the hydraulic characteristics after the new lateral aerator.
Reinforcement Analysis of Wanjiakouzi Arch Dam Using 3D Nonlinear Finite Element Method
Authors: Wei Wei , Jiang Qing Hui , Yao Chi , Xie Tao
Published: June 2011

Wanjiakouzi arch dam is constructed in a complex geological site, where a large number of faults, interlayer shear bands and karst zones exist in the dam foundation and abutments. The weak rocks have a bad effect on the stability of the arch dam. In this paper, the displacement distribution and stress field of the arch dam are analyzed using 3D nonlinear finite element method. The numerical results show that displacement between both left and right bank abutments is obviously asymmetric and there is greater compression and shear deformation along the faults under the thrust of the arch dam. Furthermore, the tensile stress at dam heel cannot meet the requirement of the design specifications. Therefore, it is necessary to reinforce the dam foundation and abutments to improve the ability to resist deformation of abutment. By taking such reinforcement measures as concrete plugs and consolidation grouting for weak zones, the asymmetric displacements between abutments are decreased significantly and the tensile stresses of dam heel meet the stability requirement.
The Arch Dam Foundation Rock Mass Unloading and Relaxation Deformation Characteristics and their Monitoring Result Analysis
Authors: Li Shi Sheng , Dong Ze Rong , Li Qi , Zhao Hua , Zhang Hui
Published: June 2011

After foundation excavation for a dam of a hydropower project, the rock mass would be unloaded and relaxed and its mechanical parameters would be lowered, thus influencing the dam stability. This paper makes an analysis of the deformation development law of the unloading rock mass of the dam foundation by analyzing the advance deformation of the dam foundation before excavation and the unloading rebound deformation of the dam foundation after excavation, and by analyzing the monitoring results of the compressive deformation after concreting of the dam and of the whole process deformation after impounding of the reservoir taking into account the results of both deformation test and acoustic test, which provides scientific basis for quality assessment of the arch dam foundation rock mass and for readjustment of the dam foundation rock mass mechanics design parameters, thus giving a reference to projects of the kind.
Influence of Hengsha Passage on Sediment Deposition in the Upper Reach of the Deepwater Navigation Channel in the Changjiang River Estuary
Authors: Gu Jie , Chen Wei , Kuang Cui Ping , Qin Xin , Ma Dan Qing
Published: June 2011

Based on the data of water depth in the South Branch and the Hengsha Passage, and the flow spilt ratio of the North Passage and the South Passage, the reasons for the sediment deposition in the upper reach of the Deepwater Navigation Channel in the Changjiang River Estuary are explored. The study shows the influence of the development of the Hengsha Passage is significant. The development of Hengsha Passage causes the increase of sediment and water exchange between the North Channel and the North Passage, which weakens the sediment and water exchange between the North Channel and the North Passage, and enhances the sediment silting in the upper reach of the Deepwater Navigation Channel. The development of Hengsha Passage also causes the scour of the upper reach of the South Passage, which weakens the ebb tide entering into the North Passage and further strengthens the sediment deposition in the upper reach of the Deepwater Navigation Channel. On the other hand, the Coriolis force and V-shaped diversion dike at the head of the Deepwater Navigation Channel also contribute the sediment deposition in the upper reach of the Deepwater Navigation Channel.
Prefabricated Box Girder Crack's Reason Analysis and Preventative Measures
Authors: Li Pan Wu , Xue Zhen Xing
Published: June 2011

With its good spanning capacity and whole structural stress performance, the prestressed concrete box girder is widely used in modern large-span bridge structures. But, if the construction of box girder prefabricated control is inappropriate, cracks will appear easily, thereby the structure stability and durability will be greatly influenced. Through analysis of concrete box girder constituent materials, pouring temperature, construction process, and according to correlative concrete anti-cracking theories and analysis, there comes the prestressed concrete box girder crack preventative measures and repairing technic.
Study on Data Transfer Methods for Fluid-Structure Interaction Analysis
Authors: Su Bo , Qian Ruo Jun , Han Xiang Ke
Published: June 2011

The data transfer method for fluid structure interaction analysis using compactly supported radial based function (CRBF-FSI) is studied. It builds transfer matrix for data exchange and makes fluid and structure mesh use different shape and density unrestrictedly. Example of data exchange on 3D interface is studied. The efficient and the accurate of CRBF-FSI method are analyzed and also the influence of different compactly-supported radius is studied. The results show that CRBF-FSI method is suitable for FSI data transfer on complicated interface if compactly-supported radius is properly chosen. It has a bright future in practical use such as wind-induced response analysis in Wind Engineering.
Bed Load Transport under Complex Flow
Authors: Liu Chun Rong , Xu Dao Lin
Published: June 2011

In this paper, the backward-facing step flow and the sediment transport downstream step were studied experimentally. The critical incipient bed shear velocity is obtained by the results of bed shear velocity and sediment incipient probability. It was found that the critical incipient bed shear velocity depends on the flow structures under the complex flow. By using the new critical incipient bed shear obtained in this paper and calculating the Shields parameter based on instantaneous bed shear velocity, the bed load sediment transport rate downstream step was given. The time history of the bed profile downstream step was calculated by bed load sediment transport rate and compared that obtained by the digital images. Good agreement was observed.
The Prediction Model of Chaotic Series Based on Support Vector Machine and its Application to Runoff
Authors: Yu Guo Rong , Yang Ju Rui , Xia Zi Qiang
Published: June 2011

Chaos and support vector machine theory has opened up a new route to study complicated and changeable non-linear hydrology time series. Applying the Chaos and non-linear time series based on the support vector machine regression principle, this paper proposes a method and its characteristic and the choosing of key parameters to forecast and set up models. According to Phase Space Reconstruction theory carry on reconstruction of Phase Space to monthly surface flow course, have discussed that probed into the non-linear prediction model of time series of Chaos of the support vector machine, application in the monthly surface flow, have introduce it through to the nuclear function of the base in the course of setting up the model of support vector machine, has simplified the course of solving the non-linear problems. The instance indicates that the model can deal with the complicated hydrology data array well, and there is the good prediction precision.
Numerical Simulation Study on Slaking Deformation Properties of High Earth Core Dam
Authors: Xu Han , Rao Xi Bao , Huang Bin , Pan Jia Jun , Chen Yun
Published: June 2011

The initial soaking of coarse-grained soil will trigger significant slaking deformation of this material. In order to study the slaking deformation of a certain dam during impounding process and its impacts on the dam body, we have adopted the slaking constitutive model by singe-line method and relevant test parameters from Changjiang River Scientific Research Institute, and conducted numerical simulation on the whole process from rock filling to impounding and slaking process of high earth core rockfill dam. The result has shown that, after considering slaking deformation of upstream shell materials, the upstream settlement is generally larger than downstream settlement on the same horizontal line, and the settlement of downstream shell materials generally stays unchanged after considering slaking deformation; at the early impounding period, the settlement of dam body is increasing, and the horizontal displacement of upstream side shell materials is pointing towards upstream. These findings can adequately explain the slaking deformation of the dam caused by impoundment, testify the new slaking constitutive model by single-line method and relevant test parameters, and provide reasonable basis for engineering design.
Study on the Influence of Seepage Behavior of Dam Foundation during Wenchuan Earthquake
Authors: Zeng Kai Hua , Ju Hai Yan , Peng Han Xing
Published: June 2011

Earthquake occurred on May 12, 2008 in Wenchuan, Sichuan Province, China, with magnitude of 8.0 and epicenter intensity of VI. Chencun hydropower station in southern Anhui Province has been shocked strongly during Wenchuan Earthquake, which stations 1,500 km away from Wenchuan. Tectonic stress caused by strong earthquakes inevitably led to the changes of stress state, groundwater level and pore pressure in the dam foundation. Seepage water level observation of the dam foundation had been encrypted immediately. According to the experimental data, it was conformed that significant effects were displayed on the dam foundation seepage because of Wenchuan earthquake, shunhe fault near dam sites was the main effect zone of earthquake tectonic stress, the downrange of groundwater depth was self-evident. As the existence of acrylamide curtain, swelling-shrinkage property of the acrylamide gel restricted the change of groundwater level and rock stress state in the dam foundation caused by seismic tectonic stress; the groundwater level behind the acrylamide curtain had a small decline, and recovering quickly.
Research on the Numerical Simulation of Silting in Floodplain and Scouting in Main Channel of Over-Bank Flooding in the Lower Yellow River
Authors: Zhang Xiao Lei , Sun Dong Po , Zhang Feng Ran
Published: June 2011

The 2-D water and sediment mathematical model which reflects silting in floodplain and scouting in main channel of over-bank flooding in the Lower Yellow River has been set up in this paper. Through carrying on 2-D water and sediment numerical simulation of the “96.8” typical flood, the author studied influence of over-bank flooding on flood travel and transverse exchange. The primary simulation results show that, adopting the over-bank flooding for silting in floodplain and scouting in main channel effectively guaranteed and expanded transverse exchange between floodplain and main channel and maintained the river channel vigor. This can relieve “secondary suspended river” states in the Low Yellow River to a certain extent; at the same time, the different magnitudes of over-bank floods have different effect of silting in floodplain and scouting in main channel.
Hydrodynamic Pressure Effect Analysis of Double-Column Pier in Deep Water under Earthquake Actions
Authors: Li Fu Rong , Wang Zhi Hua
Published: June 2011

Taking the double-column pier as the research project, based on ABAQUS finite software, using the added water mass to consider the hydrodynamic pressure effect, considering the nonlinear of the soil and the concrete, building the hydrodynamic pressure effect model analysis of double-column bridge pier in deep water under earthquake actions, analyzing the hydrodynamic pressure effect on the relative displacement, acceleration, shear force, moment responses of pier and its hydrodynamic pressure coefficient under the earthquake. The results show that the earthquake hydrodynamic pressure changes the seismic responses characters of the pier, and increases the relative displacement and acceleration of pier top, and also increases the internal force of pier bottom. It is necessary to consider the hydrodynamic pressure effect in the bridge seismic design for comply with the actual situation better.
The Coal Mining Mode of Paste-Like Fill and its Application Prospects
Authors: Huang Yu Cheng , Feng Rui Min , Wang Hong Pan , Zhao Wen Ping , Liu Yong Fei
Published: June 2011

The coal mining mode of paste-like fill shows the connotation and characteristics of green mining both in the filling materials and mining backfill technology. Combined with the practical situation of colliery, some main components of the coal mining mode of paste-like fill are introduced emphatically, such as the cemented filling material, the preparation and transportation of filling materials, and filling technology at working face; the application prospects on mining with paste-like fill are analyzed.
Water Bursting Mechanism of Coal Floor with Pattern Dynamics
Authors: Gao Zhao Ning , Meng Xiang Rui
Published: June 2011

Coal floor water inrush is the reason that the deformation and failure of rock strata in floor is induced by mining stress, cracks gradually develop, grow and accumulate, catastrophe result in forming water inrush passages, finally floor water inrush occurs. Interactions of adjacent damage element and long range correlation in coal floor are simulated by pattern dynamics. The evolution process of floor cracks is simulated by the change of element state, and some criteria are given to judge if the floor will fracture with the change of element state. The obvious characteristics of evolution process of floor cracks are progressive, and cracks make order-disorder distribution at different scales that evolve into order distribution, and finally form water inrush passages.
Experimental Investigation of Simulating Similar Materials of Multi-Seam Mining in Steep
Authors: Liu Kui Xing , Wei Xiao Gang , Liu Shu Xian , Lv Li Ping
Published: June 2011

The similar material model method is used to simulate to the movement of cover rock and ground which is caused by mining underground coal, the substance of deformation and failure law of similar material model method is that artificial materials which are used in the experiment have similar physical and mechanical properties as archetype, affinity constants of geometry, movement and force are used as similarity index and criteria in the simulation experiment as the most important factors. The prototype model is made into a certain proportion model in reduction, and the initial state and boundary conditions of model must be similar as archetype. Then exploit the simulating model, the regular patterns of fault destruction, curve, movement and deformation of cover rock can be discovered in the process of exploiting the simulating model, and the movement and deformation of the surface and its sphere of influence can also be got. Finally the observations of model can be calculated and projections up to the prototype by the similarity index, so the most important regular pattern of the prototype can be got.
Hysteresis Analysis of RC Columns Based on Fiber Cross-Section Model
Authors: Zhou Yan Qun , Ye Mei Xin , Yang Zhi Shuo , Ou Li
Published: June 2011

The seismic performance of reinforced concrete(RC) columns is one of the controlling factors of the shock resistance for RC frame structures and bridges under seismic loads. Due to the complicated material behavior and complex external force during the earthquake, an accurate simulation of the mechanical performance under seismic loads demands more precisions for the hysteresis constitutive laws of materials. In this paper, based on the fiber cross-section model, adopting revised Kent-Park model for concrete and Legeron model for steel reinforcement, programming the UMAT material subroutine, FEM software ABAQUS is used to simulate a RC column mentioned in a research. It’s results are found agreed well with the test results.
Research of Bored Pile Bearing Capacity with Mud Layer
Authors: Zhang Xiang Dong , Zhang Xue Lei , Wang Meng , Zhang Hong Hai
Published: June 2011

Bored pile as a major type of foundation, during the construction process, hole collapse or weak air tightness of catheter leads mud layers or broken pile, which makes bearing capacity reduction or even complete loss leading differential settlement of building foundations. In this paper, two-dimensional simulation of the pile has been made by finite element analysis software ADINA. By using of large-scale numerical analysis software MATLAB, the data obtained has been fitted deriving empirical formulas, which researches how different thickness and depth of mud layers impact on bearing capacity of bored piles, having a certain engineering applications.
Communication in the Cladding Supply Chain
Authors: Du Qiang , Yang Jian , Ledbetter Stephen
Published: June 2011

The increasing complexity of the cladding procurement and fragmentation of the supply chain bring challenges for communication and making informed decisions. Based on the study on cladding design and procurement process, this paper identifies the flows existing in the cladding supply chain and patterns of communication between the parties involved. The results of the research provide the foundation for further innovation on effective and secure approaches to information exchange and collaborative decision making.
Research on Whole Life Cycle Management Policy for Green Buildings in Tianjin Eco-City
Authors: Hu Jia Xi , Bu De Qing
Published: June 2011

Based on whole life cycle of green buildings, the project aims to build a management policy system for green buildings in the eco-city including planning, design, construction, operation, post-evaluation and general management, to promote this system in Tianjin Eco-city guided by “the principle of practicable, replicable and expandable”, and to provide related suggestions for the government to develop life cycle management policies for green buildings with the practical experience of the eco-city project.
Analysis on Whole Life Cycle Cost Management of Highway Engineering
Authors: Feng Hui Hong , Ding Xiao Ping , Chen Jing Si , Chen Yu
Published: June 2011

According to the analysis of the current problems in highway engineering cost management, this paper puts forward the idea of the whole life cycle cost management in highway engineering, and elaborates the specific contents and the control methods of engineering cost management for all stages in the construction process.
Critical Safety Factors in Construction Projects
Authors: Heravi Gholamreza , Nabizadeh Rafsanjani Hamed
Published: June 2011

Safety is very important aspects of construction projects which are the most hazardous endeavors have many work-related injuries and accidents. Accordingly, safety factors must be considered in project lifecycle from beginning of a project to its end. To improve project safety, the definition of safety factors and determination of their importance are necessary. In some of the previous researches several safety factors are introduced. In this paper, safety factors in construction project are reviewed and categorized as well as an exhaustive classified catalogue of critical safety factors in construction project which don't have unnecessary details is developed. The identification of the critical safety factors which are categorized in four main groups consists of safety approach, safety engineering, safety management and safety on construction site will enable appropriate allocation of limited resources.
Application of Emotional Quotient in Project Management of Construction
Authors: Zhu Shuang Ying , Zhang Min , Mo Nan Ming
Published: June 2011

Emotion Quotient has been used in all kinds of managements, this article will study how to use emotional quotient in project management of construction primarily, especially using most needed EI skills in project management of construction and to make project management efficiently during the project life cycle.
Effects of Shallow Gas on Diaphragm Wall Trenching Construction of Hangzhou Metro
Authors: Wang Yong , Kong Ling Wei , Guo Ai Guo
Published: June 2011

Considering adverse effects of shallow gas geology on Hangzhou Metro construction, based on the fluid-solid coupling analytical method of multi-phase media, effects of shallow gas on diaphragm wall trenching construction were examined by using FLAC-2D software. In combination with the diaphragm works of a typical subway station in the region buried shallow gas, the deformation on slurry trench of diaphragm wall were analyzed under working conditions using different specific gravity slurry. Results show that shallow gas escape of the stratum significantly affects stability of the groove wall, easily leading to collapse of the soil and resulting in the concrete diaphragm wall with quality problems such as honeycomb, reducing diameter, bulging, breaking zone and etc. In trenching construction of the diaphragm wall, increasing the specific gravity of slurry appropriately is an effective way to reduce adverse effects of the shallow gas, but it should not be too large. A suitable range of mud weight varies from 1.06 to 1.10.
Observation Study on the Stability of Frozen Soil Roadbed Equipped with Thermosyphon in Chaidaer-Muli Railway
Authors: Ji Chen , Bo Zhang , Song Rui Fang , Dong Xian Fu , Zhang Lu Xin
Published: June 2011

The Chaidaer-muli railway winds along the Datong River in the central region of the Qilian Mountains. The widely distributed permafrost along the railway is characterized by swampy and warm, which leads to the poor Engineering geologic conditions of the transportation line from the point of frozen soil. That the extending direction of the railway is nearly southeast-northwest causes its roadbed experience the yin-yang slope problems. To improve the stability of frozen soil roadbed, proactive cooling measures were adopted in a large proportion of the roadbed with permafrost, in which about 20km railway was equipped with thermosyphon. At the same time, different design parameter was adopted in the sunny and shady side slopes in the thermosyphon parts. Observation data in the experimental section with warm permafrost shows, under the condition of current thermosyphon techniques and design parameters, thermosyphon measures can effectively cool the frozen soil roadbed, substantially reduce the settlement and successfully solve the yin-yang slope problem of the railway subgrade in swampy warm permafrost.
Study on the Relationship between Soil-Cement Parameters and Unconfined Compressive Strength
Authors: Ma Jun Qing , Wang You Xi
Published: June 2011

This paper studies relationship between soil-cement parameters and unconfined compressive strength. The research in tensile strength and deformation modulus of soil-cement is an important basis for soil-cement failure mechanism and intensity theory. They also impact cracks, deformation and durability of cement-soil structure. Shear strength and deformation of soil-cement is important to the destruction analysis and finite element calculations. Therefore it needs to study on tensile strength, shear strength and deformation modulus of soil-cement. Based on previous experiments, the relationship of tensile strength, shear strength, deformation modulus and unconfined compressive strength of soil-cement are quantitatively studied.
Evaluation of Sustainable Urban Transport in China
Authors: Fang Jing
Published: June 2011

Achievement of sustainable urban transport requires a means of determining whether progress is being made towards sustainable urban transport. This paper adopts appraisal indicators to provide such a means of assessing progress. The paper first analyses the rapid urbanization phenomenon in china, points out the necessity of sustainability, and discusses sustainable urban transport definition. Three aspects which are impacted by urban transport development are proposed. Then the framework for the evaluation of sustainable urban transport is formulated, and principles needed to be considered when selecting indictors are described. Based on these, specific indicators for the sustainable urban transport are set out, which correspond to the seven questions of the evaluation framework. The various indicators indicate the desired direction of change, and possible disaggregations. Finally, uncertainty of evaluation criteria is studied.
Multi-Criteria Optimization of Bridge Management
Authors: Wang Zeng Zhong , Fan Li Chu , Hastak Mark
Published: June 2011

Optimizing investment funding levels and combinations of treatment types and timings, as an aid to management decision making, are vital functions of any bridge management system (BMS). Bridge management is always involved the bridge performance assessment which is essentially a multiple criteria decision making (MCDM) problem, which involves multiple assessment criteria such as traffic safety enhancement, preservation of bridge condition, protection from extreme events, agency cost minimization and user cost minimization. In this paper, a multi-criteria optimization methodology was developed not only to take due cognizance of costs but also to include a wide range of performance criteria to facilitate balanced decision-support practices in bridge management. The proposed methodology uses the AHP to determine the weights of criteria, linguistic terms to assess bridge performance under each criterion and aggregate bridge performance under different criteria into an overall performance score for each bridge structure. A numerical example illustrated the integrated methodology and the optimization process.
Durability Life Prediction of Concrete Structure Based on Reliability
Authors: Ma Ya Li , Zhang Ai Lin
Published: June 2011

Probability analysis on the durable life of concrete structure under chloride environment is little known. Using the probability method based on the second Fick’s law, research work was carried out to investigate the distribution factors that may influence the durable life of concrete structures. Due to the deficiency of decisive method to predict durable life, A method——based on the regulated reliability index is proposed. The relationship between durable reliability index and the corrosion time is established. The paper takes the time when the durable reliability index falls below the stipulated index as the end of durable life. The proposed method of durable life about concrete structure under chloride erosion environment is improved.
Study on Quantitative Risk Assessment of LGP Transportation in Road Tunnel
Authors: Zhang Yu Chun , He Chuan , Fang Yong , Sun Xiao Qin
Published: June 2011

Based on the tunnel environment and the characteristic of flammability and explosion of liquefied petroleum gas (LGP), the leak of LPG tanker can induce heavy casualties and property loss in the tunnel. In order to study quantitative risk of LGP transportation in road tunnel, the data of 599 accidents and 659 accidental vehicles are collected. From these data, the proportion of LGP tanker accident in the total accident vehicles and million vehicles kilometer (MVK) tanker accident rates are obtained. By analyzing the leakage scene of LGP tanker, the possible accident types of the LGP transportation were analyzed, such as boiling liquid expanding vapor explosion (BLEVE), vapor cloud explosion (VCE), flash fire and jet fire, etc. The impact of leak time to various ranges of injury is studied in the condition of LGP continued leakage. The slight injury, serious injury and death radius of LGP leakage accidents are calculated in tanker loaded with different LGP quantity. In view of the accidental analysis, the countermeasures will be proposed to reduce the risk of LGP transportation in road tunnel.
Pre-Arrange Trim Method on Panamax Vessel when Transit through the Panama Canal
Authors: Shen Jiang , Wang Yun Tao
Published: June 2011

The Panama Canal Authority has special requirements on “Size and Draught Limitation of vessels” when a vessel transit through the Panama Canal. This paper based on requirements from the Panama Canal Authority and characteristics of the Panamax vessel, represents a pre-arranged trim method on making optimum cargo plan so as to fully utilize the Panamax vessel’s carrying capacity and ensure smooth transit through the Panama Canal, it has been proved efficient and reliable.
Strategy and Realization for Obstacle Avoidance of Wheeled Mobile Robots Based on Dynamic Modeling
Authors: Jia Peng , Huang Yu Mei , Cheng Xiang , Yang Xian Hai
Published: June 2011

Wheeled mobile robot is a typical non-integral system. The non-integral constraints of the system make the dynamics modeling and trajectory tracing more difficult. In the study and development of a wheeled mobile robot prototype SDLG-C, aiming at the characteristics of the non-integral constraints, the dynamics model has been built with the Newton-Euler method by directly integrate the non-integral constraints into the dynamics equations. Consequently, the Obstacle avoidance effects of the high frequency disturbance on the performances of the control system have been eliminated. Based on the behavior–based robot control technology, the intelligent avoiding barriers control system design of an autonomous mobile robot is presented. And the implementation technology of this scheme is introduced; Simulations and experiments are processed to evaluate the proposed algorithm. Both of them have successfully verified the feasibility of the modeling and the effectiveness of the Obstacle avoidance strategy.
Parameter Revision of the Bailey Method on Gradation Examination
Authors: Xu Yong Li , Jiang Hao
Published: June 2011

The Bailey method put forward three very significant parameters CA, FAc and FAf, provided an effective way for the asphalt mixture gradation test, and it could evaluate the gradation of asphalt pavement core sample effectively. Based on the analysis of common gradation, the parameters of formula was revised, the application conditions of AC mixture and the parameter range for AC mixture was proposed, that based on the gradation which is standard recommended and the core samples in different pavement conditions. The results proposed theoretical basis for gradation examination correctly with the Bailey method.
Uniform Design and its Application in Grouting Simulation Experiment
Authors: Liu Qin , Li Shu Cai , Li Li Ping , Zhang Ning , Zhao Yan
Published: June 2011

The uniform design is a new design method for investigating the experiment with many factors and levels, which can get enough experiment information with less experiment times. The advantages of uniform design are introduced in the paper, it can seek experimental points to be uniformly scattered in the experimental domain, which reduce experiment times greatly and get good experiment results. The new polymeric grouting experiment is designed by uniform design and the experiment data has been studied by regression analysis. It is proved that distinct influencing factor on grout diffusion radius are grouting pressure and permeability, but the influences of grouting time and grout temperature are smaller, their relation has been obtained through regression analysis, uniform design is efficient and credible method of experimental design by the experiment results.
Magnetic Microscopic Evaluation of Early-Stage Fatigue in WMZ (Weld Metal Zone) of Low Carbon Steel Plates (JIS, SS400)
Authors: Kida Katsuyuki , Honda Takashi , Santos Edson Costa , Saruwatari Kenichi , Uryu Megumi , Houri Keisuke , Kanemasu Kenji
Published: June 2011

Cyclic stresses around welding joint-part affect the strength of mechanical components. In order to understand the fatigue phenomena caused by the cyclic stresses, non-destructive methods that can be related to number of stress cycles are necessary. In the present work, we used a newly developed scanning Hall probe microscope (SHPM) equipped with a GaAs film sensor and observed three dimensional magnetic fields of the specimen before and after four point fatigue testing at room temperature in air. Low carbon steel plates (JIS, SS400) were used in the experiments. It was found that the intensity of the magnet field in a direction perpendicular to the specimen surface was strongly affected by the fatigue testing. This result means that we can evaluate the fatigue in welding-joint area using quantitative magnetic field measurements. Furthermore, it was discovered that the key factor to evaluate the fatigue is the range between “S” and “N” (“peak-to-bottom” values) of the magnetic fields.
Research on Rigidity of Circular Tubular ZYY-Joint in Single Fold Surface of Multi-Planar Steel Structure of 26th Universaide Shenzhen 2011
Authors: Sun Wen Bo , Hu Tao , Huang Wei
Published: June 2011

Due to its convenience of construction connection and simple appearance, steel tubular structure with simple joints is widely used in spatial structures. Tubular joint generally belongs to semi-rigid joint. Its different internal detail is closely related to the bearing capacity and stiffness of joints and its stiffness characteristic has some definite effects on the internal forces, deformation and bearing capacity of the steel tubular structure. In this paper, the roof structure of the main stadium of 26th Universaide Shenzhen 2011 was selected as the engineering background. This paper also studied the comparison test on different structural forms of spatial circular tubular ZYY-joints of the peaks of its steel structure by scaling down as the proportion of 1:3, and carried out a numerical analysis on these joints by finite element software ANSYS. It shows that, results of numerical analysis coincide with the experimental results and the joint with ribbed stiffener has better bearing capacity and stiffness, which can well meet the engineering needs.