bluuebunny/crossref_metadata_2025 huggingface dataset:
The Passive Control Seismic Strengthen about RC Frame Infilled Wall Structure
Authors: Meng Qing Li , Chen Jun , Chu Chun Yu
Published: September 2013

In this paper, a four-storey reinforced concrete frame infilled wall structure does not meet the seismic perform target, based on the seismic behavior target of both frame and infilled wall, to carry out the study on the passive control seismic strengthen of RC infilled wall structure with attached dampers. First, two kinds of passive control strengthen schemes were put forward. Scheme 1: Dampers were installed in the in-plane direction parallel with all 1-storey infilled walls; Scheme 2: Dampers were installed in the in-plane direction parallel with all 1-storey and 2-storey infilled walls. Then to establish the two types of passive control seismic strengthen model in OpenSees, carry out the rare earthquake nonlinear time-history analysis under El Centro, Parkfield and San Fenando ground motions. Finally, in accordance with the seismic performance target quantization index of RC Frame infilled wall structure used as hospital, i.e. considering storey drift ratio limit and infilled wall damage, judge the scheme 2 can meets the seismic performance target.
Experimental Study on the Development Regularity of Slab Concrete Cracks under Fatigue Loads
Authors: Tang Xian Xi , Liang Jin Bao , Tang Xian Zhou , Xu Yue
Published: September 2013

As for the study on the development regularity of slab concrete cracks under the fatigue loads with amplitude of certain values, two groups of reinforced concrete slab bridge specimen were made. The fatigue test was carried out on one group of specimen, and the corresponding static load test was carried out on another group of specimen, the experimental study on the development regularity of concrete cracks at bottom of slab were carried out. The results of the study shown that, under the fatigue loads at a certain amplitude, the development trend of cracks caused by loading at the bottom of slabs changed more under fatigue loads. The reasons caused the changes of development regularity of concrete cracks were analyzed. The experimental results has the vital significance of further research on the development regularity of concrete bridges under the action of fatigue loads.
Transfer Matrix Method for Natural Vibration Period of Shear Wall Structures with Large Space at Lower Part
Authors: Zhang Shuo Ying , Zhao Xiao Xia
Published: September 2013

This paper established the theoretical equations of transfer matrix method for shear wall structures with large space at lower part to calculate natural vibration periods. The bottom structure is simplified as a hinged plane system with a complex frame and a complex shear wall, and the upper structure is simplified as a complex shear wall. Transfer matrixes between adjacent stories were established according to the fluctuated equations of complex members and equilibrium and displacement compatibility conditions. After multiplying the transfer matrix of every story, transfer matrix of the whole structure was established. Finally, the solving equation for the natural period was deduced by the boundary conditions. An example showed the feasibility and reliability of the method. In comparison with FEM, it is a convenient and universal method and is recommended for preliminary design of shear wall structures with large space at lower part.
Solution for the Shear Lag Problem of U-Shaped Beam by Three Bar Stimulation Method
Authors: An Ya Wen , Zheng Qi Zhen , Bao Ya Min
Published: September 2013

three bar stimulation method was adopted to build a differential equation about shear stress for U-shaped beam slab. Relative stress formula for simply supported beam which is subject to uniform load and concentrated load was obtained by solving and deducing differential equation.In order to compare with general beam theory simply,this paper introduced a concept of shear lag coefficient. Finally,combined with a actual example,after compared with measured value and other theoretical results,final result was satisfactory.
Focus on Sustainable Bearing Structures
Authors: Deng Francis , Hong Zhang
Published: September 2013

Targeting at a factor 20 reduction of the environmental load of buildings in 2040, it is necessary and logical to start by reducing the environmental load of the most important aspects of a building. The bearing structure is responsible for the second largest part of the environmental load of the building; the energy consumption is responsible for the greater part, assuming the life span of a building is 75 years (van den Dobbelsteen & van der Linden, 2000)[2]. The bearing structure consists of the foundation, columns, beams, floor and roof structure, and sometimes walls and facades. The horizontal elements of the bearing structure, comprising of the floor, roof structure and beams, are causing about 80% of the environmental load of the total bearing structure. Particularly the floor & roof structure play a very remarkable role (Arets, 2000). Therefore, optimization of the floor structure will lead to an important environmental improvement of the whole office building. The question which structural material is ecologically or economically best, depends on the span the building design needs. For each floor type, for structural spans between 4.8 and 16.8 m, the environmental load and cost have been determined, resulting in a clear overview of best solutions for different spans.
Calculation and Application of Steel-Concrete Composite Beams Stiffness Amplified Coefficient
Authors: Mu Zai Gen , Cheng Jing , Fan Zhong
Published: September 2013

Steel-concrete composite beams have been widely used in the high-rise buildings and large span steel structure. Composite beams effective flange width has been further investigated in domestic, as well as the force and deformation within elastic stage and plastic stage. In this paper, we give out the formula derivation of steel-concrete composite beams stiffness amplified coefficient. Combined with a practical engineering, we analysis the impact of stiffness amplified coefficient on the whole structure by SAP2000 software and compare the results back and forth. In the end, we put forward some suggestions for construction engineers.
3D Numerical Simulation Analysis and Pre-Estimation New Technology of Ground Collapse Caused by Subway Shield Construction
Authors: Liu Yuan Liang
Published: September 2013

The prediction of ground collapse caused by subway shield construction has been an important technical problem in urban subway shield construction, if the ground collapse could be pre-estimated, it could be able to take appropriate precautionary measures in advance to avoid the occurrence of ground surface settlement before the project construction, but it’s difficult to predict and calculate the settlement accurately. This paper analyzed main causes of ground collapse caused by shield construction, summarized the influence of several important parameters to surface settlement and then Midas GTS 3D numerical simulation software was used to simulate shield construction process and calculate ground surface settlement, to calculate stress, strain and displacement of overlying strata above the shield driving machine, obtained calculated values of surface settlement to predict ground collapse. Practice has proved that this pre-estimation new technology is in accordance with fact, it provides a useful reference for subway shield construction project.
Study on Design of Working Shaft for Oil and Natural Gas Pipe in Cross River Slurry Shield Tunnel
Authors: Zhou Xiao Jun , Yu He Ran , Wang Xiao Feng , Hu Hong Yun
Published: September 2013

In terms of oil and natural gas pipe to be installed in working shaft, and in light of basic dimension of slurry shield machine and its supporting system, required parameters of working shaft, such as its diameter, lining structure, building envelope have been presented in this paper. Meanwhile, the thickness of building envelope and permanent concrete lining for working shaft is also proposed through the analysis of its elastic stability and anti-buoyancy under influence of earth and ground water pressure.
Analyze Smoke Extraction Efficiency on Point Exhaust System of Side Direction for Immersed Tunnel Impact Shape of Smoke Dampers
Authors: Yang Xiu Jun , Xing Yan Ying , Shi Zhi Gang
Published: September 2013

Shape of smoke dampers is the important technical parameters for point exhaust system of side direction. This article through theoretical analysis, using CFD software Ansys Fluent by CO as tracer gas ,analysis smoke extraction efficiency for different shape of smoke dampers in order to better ensure capture efficiency. After analysis, the flat shapes of smoke dampers have better capture efficiency.
Extending Section of Underground Cavities and Analysis of the Stability for Surrounding Rock
Authors: Lai Yuan , Lin Zhen Rong
Published: September 2013

Expatiate the forms of underground cavities extending section. Express the character and application range of every form. The stress-strain states of rock around garage, in each form at each step, were defined through carry out numerical simulation by using the ANSYS program.
Numerical Analysis for Excess Pore Pressure Dissipation Process for Pressed Pile Installation
Authors: Zhou Tai Quan , Tan Feng , Li Cheng
Published: September 2013

The finite element analysis is performed on the excess pore pressure dissipation for pressed pile installation using the ABAQUS finite element software. The modified Cam-Clay model is used to model the soil behavior. The finite slide contact model is used to model the pressed pile installation process. Based on the geology stratum of soils and drainage conditions, the excess pore pressure dissipation process is analyzed using the proposed method. The initial excess pore pressure distribution along the pile depth and the pile radius direction is obtained. The excess pore pressure dissipation after 98 days is analyzed.
Study on Subway Safety Measures and Emergency Rescue’s Countermeasures in Shenyang
Authors: Meng Xing , Li Meng Ling , Yu Shu
Published: September 2013

With the development of global urbanization, the development of underground rail traffic network is imperative, and the subway has become a convenient and effective traffic tool to solve people’s trip. While the subway accidents happen constantly, so the subway emergency rescue has become an important event to related departments. This paper firstly analyzes the main types and characteristics of subway emergencies, and concludes some main emergency countermeasures.
Application Research of Rock Coupling Testing System for Underground Engineering in Sanshandao Gold Mine
Authors: Ji Dong , Peng Chao , Zhao Liang , Ren Fen Hua
Published: September 2013

Rock instability and failure disasters are now common engineering-geological problems of underground engineering. The evaluation of stability of surrounding rock is a complicated uncertainty system problem, which needs various different research means. Rock coupling testing system composed of loose circle testing section, convergence monitoring section and multipoint displacement monitoring section is arranged at-600m level of Sanshandao gold mine; deformation law of roadway surrounding rock is well studied through long-term field testing and monitoring work. Achieved application results reveal overall stability of rock mass in gold mine deep area is relatively good, current impact caused by roadway excavation is not obvious. Coupling testing system is engineering practicable, which can meet the demand of rock stability evaluation study of underground engineering in Sanshandao gold mine.
Calculation on the Settlement of Two Sands
Authors: Li Tao , Gao Guo Ming , Ma Huai Bao , Fan Li Wen Ling
Published: September 2013

Sediment settling velocity in the water is a sign of important physical quantities of sediment movement characteristics. Sediment concentration has a significant impact on the settling velocity. On the one hand,in the process of settlement,Single particle of sand would arose the movement of circumambient water. Because of the existence of other sand, circumambient water is blocked and loses the freedom of movement. Its equal to increase the water viscosity. And this makes the settling velocity lower. On the other hand, sand in the process of settlement brings along the circumambient water, and that goes with the sand down, and this makes the settling velocity bigger. Moreover, the existence of lots of sands will augment the turbid water density, and increase the buoyancy of every sand and finish its settling velocity. This paper states and trims the experiment data of the yellow soil at Station Hua yuankou and Fly-ash in Zhengzhou Power Plant, Using the Robertss experiential formula and Kynch experiential formula, the turbid water thickness and the time it needs are computed. After contrasting of the computed results, we have known that the laws which Fly-ash follows better than the silt.
Influence of Water Exchange in Tide and Wave for Large Harbor with One Entrance
Authors: He Jie , Xin Wen Jie
Published: September 2013

For the large coastal harbor with one entrance attacked badly from the waves and sands from the sea, it is advantaged to break waves and produce sands, but not advantaged for the water exchange flux, especially when a point source appearing inside the harbor, the polluted water is difficult to flow into the sea in time and be diluted by the water from outside. The water flow in estuary presents the character of to-and-fro flow, and the polluted source will flow into harbor with the flood tide and pollute the harbor secondly, although it has been outside the harbor at least with the ebb tide. For the harbor with one entrance against waves, the polluted source will be more difficult to be transported to the outside when waves coming, and the water environment capacitance will decline rapidly for the polluted water not to be absorbed. It is Taizhou Wenling harbor for example in Zhejiang province, and the movement of water particle is simulated in tidal current and wave to describe the movement of the point source transported not diffused. The rusults show that the capacity of water exchange for the large harbor wih one entrance will be declined in both tidal current and wave.
Stability Evaluation for Soft Clay Slope Based on 2-D and 3-D Finite Element Method Analysis
Authors: Yan Zu Wen , Zhang Yan Yi
Published: September 2013

Slope stability for soft clay is a hard problem in practice. In this paper, 2D and 3D finite element method (FEM) based on elastoplastic model are used to calculate the stress and displacement distribution in the soft clay slope under gravity and uniform load at the slope top. Stability analyses indicate that 3D boundary effect varies with the stress level of the slope. When the slope is stable, end effect of 3D space is not remarkable. When the stability decreases, end effect occurs; when the slope is at limiting state, end effect reaches maximum. The failure mode will not be the same if the slope is under different stress states; furthermore, a standard to evaluate slope failure with FEM calculation is established. The slope failure form caused by accumulative load is different from that caused by slope strength insufficiency. The energy causing slope failure spreads preferentially along Y-Z section. When the failure resistance capability reaches the limiting state, the energy can extend along X-axis direction. The 3D effect of the slope under uniform load on the top is related to the ratio of load influence width to slope height, and the effect is remarkable with the decrease of the ratio.
Hydrodynamic and Sediment Transport in the Headland of Caofeidian after Reclamation of the Industrial Zone
Authors: Li Jing , An Yong Ning , Sui Hai Chen
Published: September 2013

Caofeidian sand island unique shoal-channel system provides construction conditions for deep-water port.By comparing the underwater topography changes before and after Caofeidian industrial construction to understand the sediment transport and erosion-deposition evolution. Bathymetry results in 2006 and 2012 showed that the deep channel is in good stability. 2 to 3 years later after construction, excepting artificial dredging area, erosion occurs in front of the headland. The sediment is transported to the west of harbor 1 entrance. Seabed sediment controlled by wave comes from the front of the southeast seawall inflection point is transported to the deep channel, some deposits in the east slope and the most is taken away by the deep channel water. All processes above become more weakly now, in the future the sea area in front of the headland will erode weakly, the sea area in the west slope will deposit weakly while in the east slope will erode weakly, and the sea area near the harbor entrance will erode.
Numerical Simulation of Wave Overtopping Based on DualSPHysics
Authors: Ni Xing Ye , Feng Wei Bin
Published: September 2013

To obtain a more detailed description of wave overtopping, a 2-D numerical wave tank is presented based on an open-source SPH platform named DualSPHysics, using a source generation and absorption technology suited for SPH methods with analytical relaxation approach. Numerical simulation of regular wave run-up and overtopping on typical sloping dikes is carried out and satisfactory agreements are shown between numerical results and experimental data. Another overtopping simulation of regular wave is conducted against six different types of seawalls (vertical wall, curved wall, recurved wall, 1:3 slope with smooth face, 1:1.5 slope with smooth face and 1:1.5 slope with stepped-face), which represents the details of various breaking waves interacting with different seawalls, and the average deviation of wave overtopping rate is 6.8%.
Existing Railway Steel Truss Bridge Static Experimental Analysis Based on Full-Bridge-Model
Authors: Sun Zhi Jie , Liu Yong Qian
Published: September 2013

Combine the specific bridge, an analytical on the bridges static performance studied through the finite element model analysis and field test method. Summary and analyze the displacement and stress variation law of the main truss, longitudinal beams and beams which the bolt and weld superstructure steel truss bridges are effected by static loads, and compared field test results with theory value. Application practice proves that the evaluation standard and inspection of steel truss bridge is appropriate.
The Analysis of Vacuum-Surcharge Preloading Method with FLAC3D
Authors: Liu Chun Yuan , Shen Song , Li Jie , Zhang Peng Chao
Published: September 2013

Based on the test section on the expressway in Jiangsu, the thesis makes a model and then conducts numerical simulation on the settlement of soft soil subgrade by using FLAC3D. The author set the filling layer null, and assigns a value to the loaded soil layer according to the construction sequence to realize multi-stage loading. The thesis also analyzes the pore water discharge and foundation deformation when the soil is consolidated. It shows that the simulation result is very close to actual measurement result, and can clearly demonstrate the real situation of settlement.
Research on High Crashworthiness Level Bridge Barrier with Limited Working Width
Authors: Yan Shu Ming , Jia Ning , Wang Xin , Ma Liang , Zhang Xiang , Li De He , Liang Ya Ping
Published: September 2013

The distance between barriers of lower deck and bridge piers of upper deck is small in Luotang River Double-Deck Viaduct. And so impact accidents with barriers of lower deck will result in vehicle frontal impact with bridge piers of upper deck, which will cause serious consequences for the main structure of bridge. So it is necessary to design a special barrier for bridge pier protecting. A kind of composite barrier is put forward considering safety performance, landscape, economic and other factors. This barrier adopted impact resistant steel as upper part and reinforced concrete wall as lower part. The barrier safety performance was evaluated by means of computer simulation with simulation models checked through full-scale impact tests results. The analysis results indicate that this barrier can protect bus with impact energy of 520kJ, unit truck with 650kJ and tractor-trailer truck with 894kJ, far higher than the highest impact energy 520kJ in current standards, and the entire performance index can meet standard requirements. It can be sure that during the impact process the deformed barrier and incline-out vehicles cannot collide with bridge piers of upper deck.
Optimization Study on Paving Structure of Steel Bridge Deck Suitable for the Chinese 2th Climate Zone
Authors: Yan Chun Xia , Li Zhi Guo , Su Bo
Published: September 2013

The six types of bilayer paving structures were composed based on the characteristics of the three most common paving materials in the article. And tests of high-temperature stability and low-temperature fracture resistance were done according to the climate conditions of Tianjin City, thus providing technological references for choice of paving material of steel bridge deck in the Chinese 2th climate zone. The testing results show that: the paving structure of 2.5cm SMA above and 2.5cm epoxy asphalt mixture below is optimal in the comprehensive indexes of technology and economy, it's the suggested paving form of steel bridge deck suitable for the Chinese 2th climate zone.
Fatigue Tests of Assembly Joints of Truss Main Girders of Temporary Footbridge for Pedestrians and Cyclists
Authors: Karmazínová Marcela
Published: September 2013

The paper is focused on the problems of the actual fatigue resistance of assembly joints of the temporary footbridge, which is newly developed in the authors workplace. The necessity of the development of a new temporary footbridge has been invoked by the lack of such constructions in a practice, both in the case of flood situations, and also as the site facilities. Within this work the attention is paid to static and structural design, mainly to the harmonization of both aspects, to achieve the efficient design. In parallel, two types of the footbridge are developed, both ones with a lower deck, truss main girders and bracings. The first structure short footbridge can reach up to 18 m span; the second structure long footbridge reaches up to 36 m span. This paper deals with some problems of the short footbridge fatigue and presents the basic information on the actual behaviour of assembly joints of the structure in the case of fatigue loading actions. The paper is focused on the fatigue tests of assembly joints including elaboration and evaluation of their main results.
A Survey on Formation Multi Unequal Span Masonry Bridges with Curve Shaped Deck: A Case Study on Khan Bridge in Iran
Authors: Zahiri Zohreh , Heydari Beni Dariush
Published: September 2013

Masonry arch bridges with unequal spans are outstanding kinds of masonry bridges which are widespread in historic countries spatially in Iran. The differences in dimension of arches which mostly lead to formation of curve shaped decks in such bridges, brings a particular architecture for masonry arch bridge. However the elements which bring different lengths and heights for spans have not yet been studied. In this research by geometrical and structural survey on Khan Bridge, a kind of multi unequal span bridge in south west of Iran, it is demonstrated that especial conditions of the case lead to formation of its architecture. It is illustrated that shape of river bed, hydraulic and geotectonic factors and structural stability, are of paramount importance in terms of featuring the architecture of multi unequal span bridges with curve shaped deck.
Success-Degree Comprehensive Evaluation Method for Effectiveness of Bridge Preservation and Replacement
Authors: Ren Mei Long , Li Lin Sheng , Liu Yun Sheng , Wei Hong Chang , Lou Can Hong , Liang Peng
Published: September 2013

It is ascertained that the indicators weight system by the Analytic Hierarchy Process and constructed the model of success-degree evaluation method to execute the comprehensive evaluation for bridge preservation and replacement project based on the existing indicators system of bridge strengthening project with the purpose of success-degree in program evaluation. The success-degree classification of the bridge preservation and replacement project improves the system of post-evaluation for bridge preservation and replacement project through division of great success, success, partial success, most failure and failure. It indicates that the evaluation model is simple to assess and conform to the reality.
Study on the Load Test of Continuous Beam Bridge
Authors: Lu Zhi Qiang , Zhang Ting , Zhao Qing Yun
Published: September 2013

In recent years, we've paid more and more attention to the quality of bridges .So the detection of bridge structure is becoming more and more popular . In this paper we use a conventional continuous beam bridge as an example for the bridge detection method to do a simple narrative .This bridge is a newly completed one from ARongqi to BoKetu in the Inner Mongolia Autonomous Region .It is a continuous beam bridge goes across a provincial highway .We carried out this static and dynamic load test on this bridge, in order to get the information to guide the acceptance of the bridge. In this test we use a large number of professional softwares and equipments. And test this bridge in two different experimental methods to get the basic data acquisition of it as well as the bearing capacity .By analyzing these data to decide the construction quality.
Study on the Static and Dynamic Load Test of Continuous Girder Bridge
Authors: Yu Shi Hua , Zhang Ting , Zhao Qing Yun
Published: September 2013

As we all know that the bridge may appear different diseases after years of operation. The static and dynamic tests are taken to test the actual working condition and the bearing capacity of the bridge. This article describes the principles and methods of the brdige test. We will analyze the tests, the data and information of bridge so that we can accumulate the mechanical characteristics of this bridge.
Probabilistic Peak Displacement Analysis of Bridge Structures with P-Δ Effect
Authors: Yu Bo , Liu Di , Yang Lu Feng
Published: September 2013

Peak displacement is one of the most important parameters for the performance based seismic design of bridge structure, while the peak displacement is often significantly impacted by the P-Δ effect. In this study, the influence of the P-Δ effect on the statistics of peak displacement of bridge structure was quantificationally investigated based on a series of nonlinear time-history analysis. The bridge structure was idealized as the single degree of freedom (SDOF) system and the hysteretic behaviour was represented by the improved Bouc-Wen model. The statistic analysis was implemented based on the inelastic dynamic responses of the SDOF system under 69 selected earthquake records. The results show that the P-Δ effect has significant impact on the mean and dispersion of peak displacement of bridge structures, especially if the normalized yield strength and the natural vibration period are small.
Finite Element Analysis for Pile Group Foundation Settlement in Soft Soil
Authors: Tan Feng , Zhou Tai Quan , Li Chen
Published: September 2013

The three-dimensional finite element model for pile group foundation settlement analysis within soft soil pile is developed using ABAQUS. The Cap plasticity model and the elastic model are used to model the soil and the pile respectively. The contact interface elements are installed between the pile and the soil interface. The undrained loading conditions and drainage loading conditions in the soft soil piled raft foundation settlement are analyzed respectively and computation results are compared. The results show that pile group foundation in soft soil settlements increase with load increasing in both the undrained conditions and drainage conditions. The bearing capacity of the pile group under the undrained conditions is larger than that under drained conditions with the same pile group. The pile group settlement under the undrained conditions is smaller than that under drained conditions.
Study of Viscoelasto-Plastic Model with Double Yield Surface Considering Coupled Deformation and Seepage
Authors: Wang Bi Fei , Li Yong Quan
Published: September 2013

The Viscoelasto-Plastic Model with Double Yield Surface is detailed deduced. Finite element equations are introduced when the deformation is considered under Coupled Deformation and Seepage Fields. Numerical simulation is carried out during the construction of the dam. All the results calculated are in accordance with the general law of the dam. Those show that it is feasible for calculating the stress field and displacement field. The method adopted and those results gained by numerical method may provide reference to engineering practice.
Influence of Rubber Powder Content on High-Temperature Performance of TOR Rubber Asphalt
Authors: Guo Yong Mei , Chen Wei
Published: September 2013

Six kinds of TOR rubber asphalts with 5%-30% rubber powder contents of were selected to carry out conventional high-temperature tests and dynamic shear rheological tests to obtain some parameters reflecting the high-temperature performance of asphalt binders, such as softening point, dynamic viscosity at 60°C, rutting factor (G*/sinδ) at 60°C and critical temperature of rutting factor (TG*/sinδ). The results show that the changing tendency of two rheological parameters of TOR rubber asphalts, G*/sinδ at 60°C and TG*/sinδ, is ascend in first and descend at last with the increase of rubber powder content proportion. The high-temperature performance of TOR rubber asphalt with the rubber powder content about 20% is the best. Softening point and dynamic viscosity at 60°C, as two conventional high-temperature parameters of asphalt binders, can describe the high-temperature performance of TOR rubber asphalt with the rubber powder content below 20%, but cannot evaluate accurately the high-temperature performance of TOR rubber asphalt with the rubber powder content above 20%, because TOR rubber asphalt has formed a network structure at this moment.
A Study on the Spiral Line Development Applied in the High-Grade Highways Design
Authors: You Run Wei , Xu You Jun
Published: September 2013

The concept of spiral line development (SLD) is introduced at first in this paper, then the design idea of SLD is discussed, and the characteristics and patterns of SLP are summarized. According to the terrain adaptability and linear continuity requirements of SLP, rationality of the SLD applied in the high-grade highways in mountain areas are analyzed from the aspects of technology, safety, economy and environmental protection. The results show that SLD is a better decision in the case of the limitation of topographic and geological conditions, too large height difference between the two control points, no natural line development conditions, and the reverse loop development dissatisfying the requirements of high-grade highways index
Study on Limit Height and its Stability of Open-Pit Dump Based on Basement Bearing Mechanism
Authors: Peng Chao , Ji Dong , Zhao Liang , Ren Fen Hua
Published: September 2013

This paper, which combines with the actual situation of mine, discusses the limit height and stability of the dump. Based on the basement bearing mechanism and different types of topsoil thickness, a method to calculate the height of the dump is put forward. Since the topsoil of Xichuan dump belongs to the thin type (h< h1+h2), and take into account of dumping technology, the limit height is determined to be 220 meters, which exceed design level (160m). And then, using limit equilibrium method based on Geo-Slope to analyze stability of the slope. The value of slope safety factor is 1.175~1.210, which is in conformity with the basic requirement of safety. In addition, the result also provides the dependable basis for the dump expansion.
Research on anti-fatigue ability of Sisal Fiber Asphalt Mixture Pavement
Authors: He Zi Ye , Liu Fu Xue
Published: September 2013

Fatigue crack is one of the main road damage forms of asphalt pavement structure, and serious impact the asphalt pavement performance and service life. Asphalt mixture has typical viscoelastic,and can get Burgers model and viscoelastic parameters form creep test. Using finite element method of fracture mechanics, simulation under dynamic loading, research crack extending behavior of common asphalt concrete pavement and mixed with 0.2% of sisal fiber asphalt concrete pavement. From the results, it can find out that when mixed with sisal fiber, the anti-fatigue cracking performance is obvious enhancement.
Continuous Evaluation of the Road Skid Resistance with ViaFriction
Authors: Wang Da Wei , Schacht Andreas , Schmidt Stefan , Oeser Markus , Steinauer Bernhard , Chen Xian Hua
Published: September 2013

A newly developed skid resistance measurement system ViaFriction is studied, which can detect the skid resistance under conditions with a variable slip rate, just like the braking process with an anti-lock braking system (ABS). Until now there is still no evaluation framework on the testing results from this test system. In the scope of this paper, the impact from the temperature of the ambient air, the road surface, the tire and the water for the test as well as the influence of the driving speed of the test vehicle on the testing results of the ViaFriction was identified and transferred to a correction function. This total correction algorithm for the measurement results of the ViaFriction allows a comparative analysis of the friction coefficients at different speeds and under different testing temperatures.
Study of Pier Top Longitudinal Horizontal Rigidity on Rigid Frame Bridge Continuous Welded Rail
Authors: Hu Zhi Peng , Wang Ping , Xie Kai Ze , Liu Ting Lin
Published: September 2013

The pier longitudinal horizontal stiffness is the key technical parameter of rigid frame bridge and the continuous welded rail. Both the distribution of longitudinal force and the relative displacement between the beam and rail are rely on the longitudinal horizontal stiffness of the pier. This passage takes the symmetrical arrangement of different span rigid frame bridge in ballast track as an example to study the value of pier top longitudinal horizontal rigidity, using the finite element method. The analysis show that when the amplitude of rail temperature variation is less than 50 °C and the nominal temperature span within a certain range, the minimum value of pier longitudinal horizontal rigidity depends largely on the braking conditions. However, as the further increasing of the span, the pier longitudinal horizontal rigidity is restricted by the expansion conditions. Therefore, the small resistance fastening system should be taken into consideration. Especially, if the temperature of rail reaches above 50°C, laying rail expansion adjuster is needed in order to satisfy the requirement of the continuous welded rail temperature on bridge.
Deformation Monitoring of Railway Bridge Group Influenced by Construction of Metro Tunnel
Authors: Shi Liang Hong , Feng Chuan Bao , Zhang Tong Gang , Sha Shang Dian , Su You Wei , Du Sheng Wei , Zhu Gang
Published: September 2013

With the development of the high-speed railway (HSR) and metro, the metro crossing the HSR in operation usually happened in metropolis. Considering the stability of railway bridge foundation is very critical to the safety of HSR in operation, it is very important to monitor the influence of the construction of metro tunnel. The no.6 metro line of Nanjing city is crossing the railway bridge group, including three HSR lines, Beijing-Shanghai HSR, Nanjing-Anqing intercity railway, and Shanghai-Wuhan-Chengdu railway. A real-time deformation system using sensors with high accuracy and wireless network is designed to monitor the bridge piers, which are adjacent to the metro tunnel and may be affected in the bridge group. The tilt and settlement of bridge piers and horizontal displacement of pier head are considered in this system. The monitoring results show the feasibility of the system and grantee the operation and bridge engineerings safety.
Wide Juncture Cracking Effect on the CRTS II Slab Track
Authors: Zhang Si Fang , Ren Juan Juan , Wang Ji
Published: September 2013

The CRTSⅡ slab track is one of the major ballastless tracks in China. Factors of the design, the construction, the train load and the service environment lead to the wide juncture cracking. The beam-solid model on the elastic foundation was established to carry out the mechanics analysis. Theoretical analysis was made on the influence of the depth and the length of the cracking on mechanical properties of the CRTS Ⅱ slab track. The train load and temperature load can make the increase of the warping of the slab that cause the irregularity of the slab track. When the wide juncture crack completely, the sudden chill can make the slab track crack and effect the quality of ballastless tracks.
Subway Station Fire Prevention System Safety Analysis
Authors: Wang Ruo Jun , Jiang Bin , Xu Yan Ying
Published: September 2013

Fire prevention system of subway station plays an important role in ensuring passenger safety. The Shenyang Youth Street subway station fire prevention system safety was studied, applying performance-based fire protection design analysis method, using of FDS simulation software on the station fire prevention safety system for the calculation and analysis. Three working conditions were set when subway fire happens. Fire smoke flow characteristics and the distribution of temperature, CO concentration and visibility were analyzed and compared. The results show that the automatic sprinkler system and smoke control system have great effect on the preventing spread of fire. In the automatic sprinkler system and smoke control system conditions, fire hazards have not reached the standards of passengers tolerance.
Study of In Situ Mechanical Response of Asphalt Concrete Pavement with Granular Base
Authors: Shen Peng
Published: September 2013

As elastic modulus of unbounded granular materials is strongly influenced by stress level, pavement structure parameters must be taken into account in its modulus determination. It is found that the backcalculated modulus of granular base vary according to the layer on which FWD is tested, which verifies the fact that unbounded granular materials is strongly influenced by stress level. And an earth pressure cell that is applied to acquire compressive stress conducting to granular base course when the pavement is subjected to vehicle load is buried on the top of granular base course. The backcalculated modulus is then applied to analyze mechanical response of the pavement by 3D finite element method. At last, the calculated result is compared to the dynamic response acquired in-situ by earth pressure cell.
The Mechanical Response Characteristics Analysis of Emulsified Asphalt Mixing Plant Cold Recycled Materials
Authors: Yang Yan Hai , Gao Jing Xiong , Gao Xiao Xi , Shen Yang , Yang Ye
Published: September 2013

Asphalt mixing plant cold recycled materials as the layer below has been widely applied in recent years, It has better performance compared with other structural materials for the prevention and treatment of reflective cracking,for further analysis the stress conditions of the material as a grass-roots-bit suffered upper load transfer.In this paper, useing the ABAQUS software modeling analysis of three different structural pavement layers on top and bottom of the situation by force. The results show that the grassroots cold recycling layer structure has obvious characteristics of flexible it has better controlable to reflective cracking.
Seismic Analysis of a Masonry Residential Building in Wenchuan Earthquake
Authors: Zhou Qiang , Sun Bai Tao
Published: September 2013

The Wenchuan earthquake occurred on May 12, 2008 (Beijing Time) caused great casualty and economic losses, a large number of masonry buildings were damaged in various degrees in this earthquake. The masonry residential buildings are widely used in China, and the study on them is significant. Although the masonry residential building discussed in this paper which was located in the highly intensity region was damaged severely, it hasnt collapsed and has very typical earthquake damage. The story comprehensive seismic capacity indexes are developed to anti-collapse capacity index which are used to calculate anti-collapse capacity of the building, and the results are also used for comparative analysis with the results calculated by means of structure vulnerability analysis. The earthquake resistant capacity of masonry residential buildings are discussed and analyzed. Finally, some reasonable suggestions on the seismic strengthening and reconstruction of this kind of building after disaster have been given.
Dynamic Response Analysis of Reinforced Concrete Suspension Bridge under Seismic Action
Authors: Wu Li Ming
Published: September 2013

Taking the typical reinforced concrete stiffening truss suspension bridge as example, finite element analysis model under seismic action is established. Dynamic response analysis is done on this suspension bridge using finite element software ANSYS and contrast is done between this analysis result and structural response under gravity load effect. Contrast result shows that structural response under seismic action is obviously higher than that under gravity load effect in which internal force response is greater than displacement. The function of dynamic load should be taken into account in the design of bridge structure in order to provide reference for the structural design of long-span flexible bridge.
Study on Seismic Response Characteristics of Hinge-Type Slope
Authors: Su Hui , Sun Yu Song , Yan Jian
Published: September 2013

Considering the influence of dynamic interaction between soil and structure, a finite element analysis model of nonlinear dynamic interaction of hinge type slope is established. Then, numerical simulation towards its seismic response has been carried out. Analysis on stress, acceleration and response characteristics of relative horizontal displacement under different seismic oscillation are conducted. Whose results represent that when at the same intensity and spectrum of earthquake motion, the maximum dynamic stress in the middle and upper part of slope is larger while the acceleration and horizontal displacement of the top and bottom is higher. If under earthquake motion with the same intensity and different spectrum, the dynamic response of slope under Loma Prieta wave is larger than that under Kobe wave. Considering the seismic response characteristics of slope, its top and bottom are weak areas. Therefore, attention should be paid to these places in seismic design, same emphasis should also be given to the middle and middle-upper part.
Numerical Verification of Brittle Material Failure Model Test
Authors: Chen Jian Yun , Ji Lin Qiang , Xu Qiang , Li Jing
Published: September 2013

The failure shaking table model test of mass concrete structures is an important basis for understanding to the actual failure of structures. This paper derived all kinds of similar scales between model and prototype in nonlinear dynamic shaking table test, and constructed the reduced scale nonlinear numerical simulation model. The numerical results show that the failure of model and prototype matches the nonlinear similarity theory. Besides, the effect of the characteristics of ground motion was studied and it cannot be ignored to ensure the accuracy of the test.
Research on Field Filling and Penetration Test of Highly Plastic Clay
Authors: Sui Zhi Li , Wang Xu Peng , Li Zhao Guang , Zhang He
Published: September 2013

This paper has discussed the mechanism of compacted clay and the influence of compaction and penetration effected by different technological parameters such as particle composition and times of compaction etc. This research is important to ensure the quality of construction, accelerate the construction schedule, and provide reference for detection, evaluation and quality control of projects with similar requests.
Variational Inequality Formulation Method for Unconfined Seepage in 3D Fracture Network
Authors: Xu Wei Sheng
Published: September 2013

A variational inequality formulation method to define the free surface of fracture network was given, related formulas were deduced and the Finite Element Method was used to solve the equations. By computing, the following conclusions were gotten, that is the variational inequality formulation method to solve unconfined seepage in 3 dimensional fracture network of rock mass is possible, and had a better numerical stability and much less mesh-depenciency.
Overview of Research on the Influence of Permeable Structures
Authors: Shang Qian Qian , Xu Hui , Li Guo Bin
Published: September 2013

The protective structures on the shore often used in the river regulation and channel rectification works are divided into solid structures and permeable structures. The solid structures will cause an intensive change of the local flow condition, and lead to adverse impact as scouring of local foundation and edges; the permeable structures which can dissipate the flow energy are gradually popularized for use. Common permeable structures include the tetrahedron-like penetrating frame used for engineering and vegetation on the shore, etc. This paper takes the tetrahedron-like penetrating frame and vegetation for example, summarizes research on the behavior of water flow and sediment affected by permeable structures, discusses the similarities and differences as well as different effects of the functions of the solid structures and permeable structures, and finally concludes the features of application of permeable structures.
Ground Water Contamination of the Coal Gangue Leachate of Sandy Base Field in Erdos - On the Case of the Coal Waste Field of Daliu Tower Mine Area
Authors: Lu Jia Yin , Dong Shao Gang , Zhang Wei , Wu Ding Ding
Published: September 2013

Based on the hydro-geological survey, sampling analysis and combined with ground water flow systems theory, the work studied coal gangue leachate of a typical sandy base coal waste field in Erdos on ground water environmental impact. The results showed that pile of coal waste change the original characteristics of ground water flow systems, coal waste field from ground water discharge areas change into the runoff area, the bottom of Gangue heap immersion in ground water long term, the toxic and hazardous substances released and spread to the downstream by ground water runoff. Chromium, arsenic, fluoride, sulfateradical, copper, zinc, nickel, manganese and other pollution factors in the downstream ground water of gangue field and surface outlet is much higher than background value, where concentration of arsenic and NO3–N is 1.013mg / l and 31.2 mg / l, respectively higher than the background value which is 148 and 3 times.
Research on Mathematical Model of Flow and Sediment Erosion Evolution at Wassit Power Station in Iraq
Authors: Zhang Ming Jin , Zhang Hua Qing , Zhang Hong Qian
Published: September 2013

Based on site investigation data and historical data of characteristic hydrological years in Tigris River, the natural conditions and sediment environment were analyzed, a 2D mathematical model of flow and sediment was used to analyzed the intake schemes in Wassit power station (4×330MW). The calculation results based on the data of flow and sediment in representative year show that the erosion and deposition will occur in the region of water intake engineering. So the reasonable design parameters related to water intake by pump vessel should be provided by designer.