bluuebunny/crossref_metadata_2025 huggingface dataset:
Comparative Study of Microcantilever-Based Sensor for Biosensing Applications
Authors: Verma Saurav , Jain Vinod
Published: December 2014

Cantilever-based sensors have emerged as a promising label free detection technique, which have been used for high precision mass detection and biomolecular recognition. By surface functionalization, the cantilever can be modified specific to certain compounds detection. Molecules adsorbed to one side of the cantilever will deflect the cantilever due to changes in surface stress. Alternatively, minute mass changes can be detected by monitoring the resonant frequency change of the cantilever for high-precision mass detections. This work is dedicated to finite element (FE) 3Dstructural modeling of three layers micromechanical sensors in ANSYS 13.0 gives 3D model which are close to reality mathematical models. Material used in cantilever for different layers are silicon-dioxide, poly-silicon and nitride. The emphasis of the analysis is put on tile effects of the angle of inclination of the concentrated force upon the deformed shape, the load-deflection relationship stresses and strain for further analysis with a greater degree of accuracy. The model we made is three different model i.e. single layer microcantilevers, three layers microcantilever with same height and three layers with different height. In three layer the centre layer i.e. second layer, is piezoresistive layer that helps to calculate Characteristics i.e. deflection, deformation, stress and strain in the cantilever for the given applied force that can we used for future analysis for the detection of biomolecules in various biosensing application. Finally the comparison of all the three different model of cantilever according to their characteristics.
Amine-Functionalized Graphene for Natural Gas Sweetening
Authors: Subrati Mohammed S. , Lonkar Sunil P. , Abdala Ahmed A.
Published: December 2014

Natural gas is often contaminated with acid gases; commonly hydrogen sulfide (H2S) andcarbon dioxide (CO2). In addition to their offensive odor and high toxicity, acid gases can cause serious corrosion problems in a gas plant due to their acidic nature and may reduce the efficiency of gas treatment processes. Therefore, several natural gas sweetening processes have been developed for the removal of acid gases. In present work, we report the employment of amine-functionalized graphene hybrid for adsorption of acid gases. Graphene was selected as a solid sorbent due to its very high specific surface area and ability to undergo various chemical transformations.Considering high affinity of amines towards H2S, an aminated polymer, polyethylenimine (PEI) was used as a functionalizing agent. The resulting hybrids were characterized using Fourier Transform Infrared spectroscopy (FTIR), X-ray Photoelectron Spectroscopy (XPS), elemental analysis, X-ray Diffraction analysis (XRD), and Thermogravimetric Analysis (TGA). These hybrids are envisioned as materials with high H2S sorption capacities and hold great promise in natural gas sweetening applications.
A Hardware-in-the-Loop Simulation Test Bench for Subway Train Brake Systems
Authors: Wang Yan , Han Long , Wu Meng Ling , Luo Zhuo Jun
Published: December 2014

A hardware-in-the-loop (HIL) simulation test bench for subway train brake systems is built in this paper to avoid the high costs of brake system field tests and maintain the reliability of test results. The HIL simulation test bench consists of a simulation part a hardware part. The simulation part includes a train model and a GUI. The hardware part mainly consists of six pneumatic brakes and a driver controller, which is used to generate brake commands. Signal transmissions between the simulation and hardware parts are realized using DAQ and signal transformation boards, as well as an MVB network. Test results suggest that the HIL test bench proposed is able to reproduce the braking behaviours of a train rather well, thus it can be used to carry out train braking tests in place of the costly field tests in some occasions.
Deterioration of Mortar Composites in Acidic Environment
Authors: Omrane M. , Mouli M. , Benosman A.S. , Senhadji Y.
Published: December 2014

In recent years, the rapid deterioration of various reinforced concrete structures has been widely recognized as worldwide problem. Acidic environments are very aggressive to concrete structures, as well as promote their degradation. The aim of this experimental study is to make a comparative analysis of the behavior of mortars prepared by cement (CPJ-CEM II/A) and composites of different percentage by weight of polymer. It highlights the influence of PET on the durability of these mortars. After 28 days of curing specimens in water, they are put in acid solutions of the same concentration 3% (HCl, H2SO4, H3PO4and HNO3). Weights tests measuring are made ​​at different ages. The results demonstrate the beneficial effect of the addition of PET in the modified materials against chemical attack by various acids. The formations which appear such as different calcium salts were determined by X-ray diffraction. These results take into account the recycling of plastic waste in the manufacture of modified mortars against aggressive environment.
Main Clay Minerals and their Microscopic Morphological Characteristics in Zhangcun Illite Ores
Authors: Xu Bo Hui , Shen Xuan Ye , Ding Shu Li
Published: December 2014

The microscopic morphological characteristics of main clay minerals in Zhangcun illite ores were studied by using high-resolution scanning electron microscopic (SEM) and image analysis technology. The results show that: (1) the illite generally appear as crooked scaly and foliated partly; (2) illite/smectite (I/S) mixed layered mineral are banding flake with filamentous edge mostly and cusp type flake partly; (3) pyrophyllite appear to be flake and tabular sheet forming hollow pipe; (4) serpentinite are obviously fine flake with wavy shape .
Investigation on the Continuous Microwave Synthesis of Nano Titanium Carbide Powder
Authors: Zeng Ling Ke , Liu Yan Chun , Zhu Wen Cheng , Liu Ping An , Wang Hui , Cheng Xiao Su , Liang Qian Ying
Published: December 2014

In this paper, the reaction mechanism of inorganic carbon and titanium dioxide synthesis of titanium carbide thermodynamic were explored, and a thermodynamic basis date for the microwave heating was provided. Through analyzing the experimental results for the thermal stability of titanium carbide, we could obtain the theoretical parameters for the actual synthesis process.
Synthesis of a Novel Structure Carbon Nanocoils and their Application in Photo Diode Devices
Authors: Mohamed Mohammed Ibrahim
Published: December 2014

In this paper, the novel structure of carbon nanocoils were synthesized successfully by catalytic thermal decomposition of acetylene in CVD reactor under inert atmospheric pressure. Fe as a catalyst coated alumina beads used as substrate , both were placed inside a cylindrical shape stainless steel mesh SSC and located at the mid of CVD reactor. Preliminary study of application of prepared carbon nanocoil in synthesis of photodiode showed that the photodiode has a good rectification and the forward current obeys to tunneling-recombination model.
Structural Performance under Seismic over Predesigned Intensity
Authors: Chen Xiao Ming , Duan Jin , Qi Hu , Li Yun Gui
Published: December 2014

Structures are designed based on the seismic precautionary intensity, which is regulated by the government for each county. The basic target is to avoid the structure collapse under rare expected earthquake by the method of FEA and kinds of seismic measures, but buildings may encounter the seismic action with much higher intensity, the structural performance in this situation is researched by numerical methods in this paper. By controlling the parameters of displacement angle, axial compression and so on, the results show that the buildings may possess greater potential than expected.
Chinese Norms and European Norms about the Beams without Stirrups Contrast Shear Capacity
Authors: Li Yao  Yao , Zhou Dong Hua
Published: December 2014

This article briefly analyzes the European norms EN 1992-1-1 design of concrete provisions , oblique shear capacity force section of concrete beams without stirrups calculation method, the factors affecting beams without stirrups carrying capacity, such as longitudinal reinforcement ratio, shear span ratio , concrete strength , compared to the Central European norms consider different ways . Through comparative analysis, some differences between China and the EU to get concrete oblique section design methods , but also pointed out the Chinese norms factors longitudinal reinforcement ratio is not considered.
Concrete Breakout Capacity of Cast-in-Place Anchor under Shear Loading
Authors: Kim Dong Hyun , Park Yong Myung , Joo Ho Jung , Kang Moon Ki
Published: December 2014

Since 2001, ACI 319 adopted the CCD equation for the concrete breakout capacity and a modified equation was recently included in 2011. In this study a new equation to predict the concrete breakout capacity of CIP anchor under shear loading was proposed. The equation was derived from multi-variable regression on the test results conducted by the authors and other researchers. It was found that the proposed equation could consistently predict the shear breakout capacity from small to large diameter anchors and edge distances.
Structural Finite Element Analysis of Tower Top of Landing-Type Lifting Pole with Double-Level Arms
Authors: Qin Jian , Su Jie , Xia Yong Jun , Zhang Hong Sheng , Zhang Jin Miao , Hao Yu Jing
Published: December 2014

The landing-type lifting pole with double-level arms is a kind of construction equipment frequently used in erection of large-sized iron tower during the engineering of power transmission line. This equipment lifts heavy load through bilateral symmetry, thus improving the working efficiency. A finite element structural calculation model of tower top of landing-type lifting pole with double-level arms was established according to the actual situation, and this model involved different working amplitude, lifting capacities and unbalanced loading conditions. In addition, the maximum stresses and structural stability coefficients of tower head, lifting arm, draw-bar and rotary tower body were analyzed, and the safety check results of various parts at tower top were obtained. Finally, the design of connection pin of each part at tower top of lifting pole was also proposed.
The Similarity Law of Internal-Blast Wave Propagation in the Concrete
Authors: Qiu Xiao , Ding Jue , Wang Zhong Jie , Weng Pei Feng
Published: December 2014

Concrete mechanical properties under dynamic load such as blast and impact are very complex. Shock wave propagation law and damage effect in the concrete were studied numerically in the paper by using TNT explosive ignition and growth model, concrete dynamic damage model, and SPH method. And shock wave properties of different mass explosives in the concrete were analyzed with the similarity theory. The result shows that TNT shock wave propagation law meets the internal-blast similarity law. Peak pressure, positive pressure impulse, maximum velocity and maximum acceleration in the concrete decrease with the increase of scaled distance. And time needed for reaching peak pressure increases linearly with the increase of scaled distance. A theoretical basis of structure and protection design for constructions is achieved in the paper.
Refined Beam Element for Second Order Analysis of Latticed Shells
Authors: Qi Lin , Huo Hai Feng
Published: December 2014

Based on equilibrium equation of beam, the displacement interpolating functions with shear effect of spatial beam elements which are used to simulate the structure members of latticed shells are deduced. The different displacement interpolating functions in compression and tension spatial beam-column elements are unified by the method of Maclaurin series expansion, and the unified expressions which are used to simulate structure members are equivalent to those expressed by stability functions. Numerical analyses results indicate that the second-order elastic analysis method for beam structures proposed in this paper, which can perfectly incarnate the second-order effects and the geometrical nonlinearity of the single-layer cylindrical reticulated shell, is of better accurateness and higher effectiveness.
Research on the Deflection of Membrane Structure under the Snow Load
Authors: Zeng Hong , Pu Yu , Long Jun
Published: December 2014

This paper reviews the research on the deflection of the orthotropic flat membrane and saddle membrane under the external snow load. First the authors analyze the characteristics of snow load and obtain the standard snow load. Second we build the models of the orthotropic flat membrane and saddle membrane under the snow load. Then we deduce and solve the equations set of the two membranes under the effect of the pretension with the perturbation method. So we obtain the relational expression between the maximum deflection of the membrane’s centre point and the external load. At last, suppose that the load was determinate, the authors analyze the change of the deflection of the centre point of the membrane with different pretensions, side lengths and other parameters.
Erosion Effects of Sodium Sulfate Solution on the Unconfined Compression Strength of Cement Soil
Authors: Zhang Jing Yu , Chen Si Li , Shi Jian Jun , Wu Yi Han , Yang Yu Lin , Wei Xing
Published: December 2014

Based on the safety and durability in the complex environment, the experiments on unconfined compression strength about the cemented soil after eroding in sodium sulfate solution have been carried out and the influential laws of different concentration of sodium sulfate solution and eroding time on the cemented soil unconfined compression strength have been obtained. The test results show that the different concentration of sodium sulfate solution and eroding time may have influences on erosion effect of unconfined compression strength of cemented soil at different levels. If the ionic concentration of sodium sulfate solution is small, the solution has little erosion effect on the unconfined compression strength of cemented soil. But the unconfined compression strength will decrease with the increase of eroding time, and the erosion effect of unconfined compression strength will increase with the increase of eroding time. The study result is significant and valuable to the safety and the durability of cemented soil engineering.
The Finite Element Analysis of Temperature Effects on Large Flat-Bottom Squat Steel Silos
Authors: Si Heng Yun , Liu Zhen Hua , Guo Hong Wei , Wang Tao
Published: December 2014

Steel silos lack of systematic theoretical research. Based on a large floor-ash steel silo, for example, in view of a large number of documents based on the relevant specifications, the temperature load of steel silo effect is analyzed. The results show that: for those steel silos which are constructed in a larger temperature difference between regions, warehouse wall stress induced by the temperature load can not be ignored; at the bottom of the storehouse, the hoop stress, vertical stress load vary linearly with temperature, therefore, when the temperature difference is large, the temperature stress at the bottom of the warehouse is much larger than the warehouse wall stress induced by the storing load; the temperature stress at the bottom of the steel silos changes in shape of a parabola according to the silo diameter and the warehouse wall thickness. Therefore, in a certain range, reducing the diameter of the silo but increasing the thickness of the steel silo warehouse is harmful to the steel cylinder.
The Structure and Properties Research for Sealing Capsule
Authors: Luo Yong Huan , Feng Zheng Lin , Liu Jun , Guo Hong Feng
Published: December 2014

This paper, A research for the sealing capsule which used in the construction of the underwater cap of Hong Kong-Zhuhai-Macao Bridge. Through the introduction of precast pile cap construction, combined with the sealing of the capsule works, and the basic structure of the sealing of the capsule with installation design. We establish correlation model, combined with the actual working conditions, the application of the finite element analysis of the sealing capsules water sealing characteristics simulation. It shows that the sealing capsule can well meet the actual needs of the Hong Kong-Zhuhai-Macao Bridge underwater cap construction.
Deflection Change Analysis of Bending Steel Beam under High Temperature and Uniform Loads
Authors: Han Yu Lai , Zhang Xiao Le , Jiao De Wei , Cai Zuo Hua , Li Yan
Published: December 2014

In case a fire occurs in a steel structure building, materials properties and mechanical properties have undergone great changes, especially bending beam, its force complex than other members, charged with an important role in the structure, when the fire broke out the other members also prone to failure. This article refer to the document [1], the deflection change of bending steel beams subjected to fire are studied, analyzed its variation trend with the fire temperature, the accurate judgement of the stress state on the fire burning at different time can make the stress analysis more accurate and reasonable.
Experimental Study on Rainfall-Induced Three-Dimensional Deformation Characteristics of a Slope
Authors: Feng Bo , Wang Jian Xiu , Tian Pu Zhuo , Si Peng Fei
Published: December 2014

Most of slopes in nature have three-dimensional characteristics, such as displacement field, sliding surface, and mechanical mechanisms. Slope monitoring should take the three-dimensional characteristics into consideration to make monitoring networks arranged reasonably. In this paper, the Lijiazhai high slope on Shi-Ji highway is taken as engineering prototype. A similarity material of high density, low elastic modulus, and low intensity is produced. The deformation and failure characteristics of the high slope under moderate, heavy, and Torrential rain are simulated. The results show that the deformation of Lijiazhai high slope has obvious three-dimensional features. On bases of the model test, operational guidance and advice for long-term monitoring are provided.
Comparison and Analysis of the Calculation Formulas for the Bearing Capacity of Concrete Filled Steel Tubular Columns
Authors: Han Jin Sheng , Wang Xue Wen , Wang Li Yi , Ji Min
Published: December 2014

At present, many analysis methods and calculation formulas of the bearing capacity of concrete filled steel tubular columns have been researched. But these numerous calculation formulas of the bearing capacity have varied forms, and the application scope and the calculation precision of them are also quite different, which makes it difficult and confused for engineering designer to choose a suitable formula. Primary calculation formulas of the bearing capacity of concrete filled steel tubular columns are summarized. The calculation results of these formulas are compared with some test results of the concrete filled steel tubular columns with a large diameter. The applicability and the accuracy of these formulas are analyzed. Based on these comparisons and analyses, reasonable suggestion is given to select the suitable formula. Finally, one formula is provided to calculate the ultimate bearing capacity of concrete filled steel tubular columns reinforced with steel bars.
Practical Calculation Method for the Bearing Capacity at High Temperature of Concrete Filled Steel Tubular Columns Subjected to Fire
Authors: Han Jin Sheng , Liu Hao Ran , Cong Shu Ping
Published: December 2014

The fire resistance of concrete filled steel tubular column is usually obtained by the numerical analysis method, which is difficult to operate and not convenient in the actual civil engineering. So it is necessary to study the simplified calculation method. A large number of numerical simulation results of the temperature distribution of the section and the bearing capacity at high temperature of the concrete filled steel tubular columns are analyzed. The influences of secondary parameters are simplified. The simplified calculation method at 150 min and 180 min for the bearing capacity at high temperature of concrete filled steel tubular columns subjected to axial compression and fire is presented on the basis of comprehensive analysis of the numerical calculation results. The calculation results can be used as the basis to judge the fire resistance. It is shown by the comparison with the experimental results that the precision of the simplified calculation method can meet the requirements of engineering application.
The Mechanical Properties of Barite Concrete Subjected to Impact Loading
Authors: Chen Zhen Fu , Li Tao
Published: December 2014

In order to understand the mechanical properties of barite concrete subjected to impact loading, use the drop-weight experiment according to the stress, strain and displacement to find out. The experiment is designed in two ways, using different qualities of drop hammers falls in the same height or using the same quality of drop hammers falls in different height. And know the failure process of barite concrete when the area of strain rate is 1.4s-1~4s-1, and making reference to the stress time-history curves, the strain time-history curves and the displacement time history curves, comes to the conclusion that in the case of other conditions remain unchanged the peak load, the loading rate and so on will increase if make the drop hammer heavier or higher.
New Method and Application of Negative Friction Resistance Monitoring for PHC Pipe Pile
Authors: Han Liang , Yao Ai Jun , Han Jun Wei
Published: December 2014

The theoretical calculation of PHC pipe pile negative friction resistance is difficult to obtain valuable results due to many complex factors involved, such as soil properties, consolidation conditions and actual working environment, so the field monitoring is the only feasible method. The pile negative friction resistance can be got by pre-buried sensors inside the pile to monitor the changes of stress and strain of shaft. However, for PHC pipe pile, the sensors can not be embedded and protected effectively in the process of pile manufacturing, which makes the negative friction resistance of PHC pipe pile become a very thorny problem. Based on the improved field monitoring method and data analysis of sliding micrometer technology, a new method was introduced into the PHC pipe pile negative skin friction resistance testing in this paper. We can got not only the PHC pipe pile negative friction resistance, distribution range and neutral point position with different load or time, but also the strain distribution, axial force distribution, skin friction resistance and toe resistance distribution of pile, etc. The practical engineering application shows that the new method is very effective to monitor PHC pipe pile negative friction resistance and very beneficial to further research on formation mechanism and theoretical calculation of negative friction resistance of PHC pipe pile.
Numerical Analysis of Reserving Core Soil with Annular Excavation Method Used in Loess Tunnel
Authors: Sun Zhi Jie , Su Zhong Ming
Published: December 2014

To research the deformation regularity of loess tunnel in reserving core soil with annular excavation method compared with other construction methods, 3D Numerical Simulation is applied and the loess tunnel of highway is taken as an example. The research results show that[1]：The deformation of surrounding rock affected by the area of core soil is small.The stress regularity of different support structure influence on the area of core soil is different. This is mainly reflected that the maximum pressure stress of primary support increases with the area of core soil’s increasing, but the minimum bending moment of secondary lining is not appeared in the working condition which the minimum core soil area is.
Frequency Domain Analysis of Multi-Degree of Freedom in Series Model SSI Effect with Translation and Rotation Input
Authors: Fang Liang , Wang Qi Fang
Published: December 2014

Based on the multi-degree of freedom in series model, structural displacement amplitude formula is derived in the frequency domain under the translation-rotation input situation, this formula indicates that the soil - structure interaction (SSI) could be considered as adding a correction term M˜ to the mass matrix of the structure with the hypothesis of Rigid foundation. This corrected mass matrix is actually a complex matrix, which related to the input frequency and damping. Equivalent translation-rotation input is coupled with two translation input components U* and Θ*. Besides, we uses case analysis to explain the characteristics of soil - structure interaction (SSI) in frequency domain by the end of this paper.
Investigation and Preliminary Analysis of Rural and Town Building Damages of Yunnan Ludian Ms6.5 Earthquake
Authors: Lu Yong Kun , Chen Hong Fu , Zhang Hao Yu , Lin Xu Chuan , Chen Hao
Published: December 2014

The "8.03" Ms6.5 Ludian earthquake in Yunnan province is the largest earthquake of the area in recorded history. The PGA of epicenter (Longtoushan town) reaches 948gal and the intensity of meizoseismal area arrives to IX degree. The earthquake has caused severe casualties and huge property losses. Based on the earthquake damage investigation, it is found that structure types of affected towns mainly include mud-wood, brick-wood, masonry, frame, bottom frame and composite structures. In the IX degree area, most of the mud-wood, brick-wood, unfortified masonry and composite structures turn into severely damaged or destroyed. Most bottom frame structures obtain inclined shear cracks on bottom walls. Part of the masonry structures built after 2008, which are set with ring beams, construction columns, cast-in-place floors and roofs, show well earthquake performances and suffer slight damage. What’s more, most filler walls and other non-structural components of frame structures in the meizoseismal area are severely damaged, part of their column ends or beam-column joints fall into failure, which doesn’t achieve "strong column-weak beam" yielding mechanism of the seismic design code expectation. The ending of this paper summarizes a number of recommendations for post-earthquake recovery and reconstruction work according to local conditions.
Study of Shaking Table Test on Seismic Performance of 750 kV Post Insulator
Authors: Lin Sen , Lu Zhi Cheng , Zhu Zhu Bing , Gao Po , Li Sheng
Published: December 2014

The applicability of seismic waves for the seismic performance estimation of 750 kV post insulator has been investigated in full-scale shaking table test. the input seismic waves comprise El Centro seismic wave, Landers seismic wave, sine beat wave and artificial standard wave. The testing results indicate that, high dynamic responses of the equipment can be obtained under artificial standard wave condition. In addition, due to comprehensive enveloping ability and gentle spectral curve, artificial standard wave is ideal for the seismic performance evaluation of 750 kV post insulator in the test. An finite element model has been developed and numerical seismic analysis has been performed. Satisfactory match between the simulated and measured results reveals the reliability of the test. The achievements obtained in this paper are helpful in choosing reasonable input wave for shaking table test, and also provide technical support on determining seismic capacity of high voltage electrical equipment.
Study on Seismic Response of the Structure Based on New-Style Isolation Bearings
Authors: Xu Fang Mei , Chen Shi Hai , Li Peng
Published: December 2014

The new-style isolation bearings that can isolate the seismic effect in horizontal and vertical direction is presented in this paper. In order to study isolation of bearings, structure seismic isolating model is established based on new-style isolation bearings. Through the input of seismic excitation, acceleration peak and storey drift are regarded as basic discrimination factor for studying seismic response, and structure seismic isolating model is contrasted with structure seismic non-isolating model. The example shows that the new-style of isolation bearings not only can isolate in the horizontal direction, but also isolation ability is better in the vertical direction.
Numerical Simulation and Design Optimization Research of Slope Ratio and Platforms Influence on a High Rock Cut Slope Engineering Stability
Authors: He Lei , Ren Yan , Feng Zi Xia , Han Zhi Wei
Published: December 2014

According to the rock high-cut slope excavation engineering practice of a substation in Jiangxi, with the goals of stable and economic rational slope design, numerical simulation research of the slope ratio and unloading platform and design optimization work was carried out. The slope safety factor, displacement and plastic zone distribution changes of different slope ratio and platform setting programs were obtained. The results show that:(1) the adjustment of the slope ratio and platform can significantly affect the slope displacement and plastic zone distribution, reasonable slope ratio and platform can reduce the horizontal displacement and plastic zone of slope, increase the safety factor and stability;(2) the slope monitoring results show that numerical simulation optimization design is feasible, and the excavation slope maintain security and stability during the construction period, and economic benefit has been obtained. The research conclusions can provide technical support for the engineering design, and reference for design and research of high-cut slope excavation engineering with similar conditions in that region.
Research on Application of New Concrete Silo Construction Technical System
Authors: Tian Guo Liang
Published: December 2014

considering the development of concrete silo structure in recent years and engineering characteristics of large reinforced concrete silo, construction processes and structures of concrete silos are classified and general construction technical system is formed through innovation of construction technique and process. The general construction technical system focuses on adjustable drawbar climbing formwork system, inside drawbar-free climbing formwork system and whole lifting and towing integrated climbing formwork system, is featured with integrated construction and has multiple technical units, which could be combined flexibly to adapt to certain requirements of different projects. This method not only has flexible process, but also possesses uniform construction technique and process.
Particle Flow Simulation of Direct Shear Test of Rock Discontinuities
Authors: Xu Lei , Ren Qing Wen
Published: December 2014

The stability of rock masses is controlled by the shear behavior of rock discontinuities, and it is hard to investigate the shear behavior of rock discontinuities at micro-scale by using traditional physical test method. With this in mind, Particle Flow Code is used to simulate the direct shear test of rock discontinuities. The PFC model of rock discontinuities is established firstly, and its micro-properties are inversed by using the proposed optimization inversion method based on the asynchronous particle swarm algorithm. Then, the PFC simulation of shear behavior of rock discontinuities is performed. The simulation results show that the number of microcracks gradually increases with the increasement of shear displacement, and the accumulated microcracks result in the shear failure of rock discontinuities.
The Research Progress of BIM Technology from International View and the Development Experience
Authors: Zhang Yin Hui , Yan Qin
Published: December 2014

BIM technology is the hot issues on construction engineering project development and application in and abroad currently. BIM technology had been widely developed in foreign countries after the Americans brought up the BIM concept in the 1970s. They had got good results in the actual application as well as many valuable achievements and experience. We focused on the present situation and application of BIM technology from the international view, and then we summarized the trend of the studies on the application of BIM technology in foreign countries. We have tried to provide a new revelation on construction projects of BIM technology in our country by the comprehensive cognition. They got the thought of experiences and the application train.
A Management System about Prevention and Maintenance for Construction Equipment
Authors: Du Nai Juan
Published: December 2014

With the increasing expansion of the function of modern architecture, the huge construction equipment system’s daily management and maintenance are faced with the problem of high input and high consumption. It is an inevitable trend of modern architecture’s developing that we expand the maintenance management system. In this paper, we set up a management system of prevention and maintenance for construction equipment which include the basic framework, process and functional modules, which could achieve the prevention, maintenance and management on the basis of the device’s fault then greatly improve the level of equipment’s maintenance and management. Construction equipment is a combination of the facilities and equipment which is installed in the buildings, provide convenience, comforts and safety for people’s residing, living, and working. It usually include water supply and drainage system, ventilation and air conditioning system, electrical lighting system, fire controlling and security system, heat addition system and elevator system, etc. It is an important part of civil construction, its role in building is equivalent of the circulatory system and nervous system of human’s body. The architecture’s function of modern society has gone way beyond the scope of wind and rain, the demand of comfort, health, convenience and safety makes the modern architecture marching towards the direction of intelligent zing and automation, then the system of construction equipment becomes larger and more complex. The daily maintenance and repairment of construction equipment turns into a job of high consumption and input in the modern construction’s management.
Study of Architecture and Environment Design Based on the Fold Theory of Deleuze
Authors: Xun Ping , Huang Shuai , Liu Ning Bo
Published: December 2014

Based on the smooth space thinking proposed by contemporary French philosopher Deleuze, this paper describes the ideas of architectural design from the mutual transition and conversion of buildings and environment, and the design of smooth space total three aspects, to provide the reference for future architectural design.
A New Routing Algorithm Based on Adjacent Matrix in Pipeline Laying
Authors: Liu Wei , Sun Fu Quan , Yuan Hui Lin , Cao Jin Bo
Published: December 2014

With the development of economy, higher requirements for pipeline laying are raised. Among them, how to choose path for laying effectivelyand cheaply is the most important. Compared with ‘Dijkstra’, ‘Bellman-Ford’, ‘Floyd’ and ‘Dynamic planning model’, a new routing algorithm based on adjacent matrix is proposed and detailed processes and rules are designed. Additionally the effectiveness of the algorithm is proved through being applied to an example.
Development of the Management Information System on Pipe Bursts in Water Distribution Networks
Authors: Zhang Hui , Huang Ting Lin , Xu Jin Lan
Published: December 2014

The Management Information System (MIS) on pipe bursts was developed by Visual Basic 6.0 to handle the accident data in water distribution networks. The thought of modular design is adopted in system design and the whole system is divided into four modules, including user login, database connection, database operation and data enquiry & analysis. The MIS has the functions of data input, output, storage, enquiry, statistics and analysis, which are implemented by component technology, ADO and SQL. Based on the functions it can achieve day-to-day management of network accidents and supply guidance of treatment measures. So the MIS on pipe bursts is a useful tool in network management.
Research on the Safety Distance Affected by Ultrahigh Energy Dynamic Compaction
Authors: Yu Zhi Fa , Yan Shu Wang , Zhu Sheng Li
Published: December 2014

By taking practical engineering cases as an example, this article judges the safety distance affected by ultrahigh energy dynamic compaction. Through the organization and analysis of the data of several ultrahigh energy dynamic compaction projects, the opinion that the judgment method of vibration acceleration exists flaws is proposed. Considering the possible influence of dynamic compaction vibration on person and other non-buildings, it suggests to use the method of vibration velocity to judge affected safety distance.
Freeze-Thaw Damage Model for Different Types of Concrete
Authors: Chen Sheng Ping
Published: December 2014

Common concrete, lightweight aggregate concrete and self-compacting concrete with strength grade C50 were tested under freeze-thaw actions. Experimental results show that the Light weight aggregate concrete has the best freeze-thaw resistance. Furthermore, the relative dynamic elastic modulus is used to quantitatively analyze the interior damage of concrete materials subjected to freeze-thaw actions, and the freeze-thaw damage evolution equations were established by using quadratic functions, and the computational damage values agree well with the experimental results.
Researching on the Theory of Horizontal Vibration of the Pile in the Radial Inhomogeneous Viscoelastic Saturated Soil
Authors: Feng Shu Zhen , Wang Jin Shan , Cui Hai
Published: December 2014

Consideration of radial inhomogeneity of soil, an analytical solution to horizontal vibration of pile in radial inhomogeneous soil is deduced, and the parameters influencing the horizontal vibration characteristics of the pile in radial inhomogeneous soil is analyzed carefully. The number of the radial layers of the inner soil, the thickness of the inner soil, the weakened degree and the ratio of length and radius can obviously affect complex impedance of the top of the pile. Before analyzing horizontal vibration of pile, choice a reasonable number of the radial layers of the inner soil and proper thickness of the inner soil, which is crucial. The more is the weakened degree of the inner soil, the stronger the fluctuations of horizontal vibration of pile are. The ratio of length and radius can influent horizontal vibration of pile within a certain range.
Research on the Influence of the Steel Fiber on RPC Performance
Authors: Wang Zheng , Wang Qi Fan , Zhang Lin
Published: December 2014

Experimental study on the influence of the steel fiber types, content and water-cement ratio on the reactive powder concrete (RPC) performance is conducted. The results show the influence law that the 3 factors to compressive strength and shock-resistance of steel fiber RPC. In this sense, it is of vital importance to enhance structural strength, and to improve the anti-seismic and anti-detonating capacities of the key engineering in urban.
Study on Modified Asphalt Foaming Characteristic Basing on Energy Analysis
Authors: Wang Feng Cheng , Nan Xue Feng
Published: December 2014

Studying on the modified asphalt foaming characteristic, the energy indexes of the actual maximum expansion ratio and the foam index influencing on the modified asphalt foaming effect is analyzed reasonably by varying moisture content. The results show that the half-life of modified foamed asphalt decay sharply with the decrease of SBS content (modified asphalt viscosity),the moisture being mainly applied to modified asphalt foaming is proved with actual max expansion ratio index and evaporated vastly with the decrease of SBS content (modified asphalt viscosity), the modified foamed asphalt stored energy internally is reflected by the foam energy and corrected according to the viscosity.
Experimental Study on Steel Slag-Limestone Powder Concrete after Freezing and Thawing Cycles
Authors: Han Ming Zhen , Zhou Zhi Yun , Yang Fei , Zhan Ya Wei
Published: December 2014

Using the fast freeze-thaw test method, we tested the loss modulus and compressive strength of steel slag-limestone powder concrete after 0,25 times,50 times,75 times,100 times freeze-thaw cycle,studied the mechanical properties and frost resistance performance after the freeze-thaw cycle. The results showed that adding a certain amount of steel slag-limestone powder does not affect the anti-frost property of concrete; established different dosage of steel slag concrete freeze-thaw damage model: y = a + bx + cx2, degree of fitting is better; large quantity of steel slag used in concrete shall be a wider range of research.
Degradation Phenomenon of Basic Mechanical Properties of Plain Reactive Powder Concrete with Time
Authors: Wang Xiao Fei , Wang Yang Ping , Wu Li Cheng
Published: December 2014

The same batch reactive powder concrete specimens were obtained with same raw materials and curing process, uniaxial compressive strength test had been done on the specimens after hot water curing placed in laboratory for seven days , three months and three years. The test results showed that seven-day strength and three-month strength of plain reactive powder concrete after hot water curing are almost equal. Strength of plain reactive powder concrete has not degradation within three months after hot water curing. While strength of plain reactive powder appears serious degradation phenomenon after placed in Laboratory for three years. Comparing uniaxial compressive strength test results of plain reactive powder concrete at three-month with three-year after hot water curing ,we find that strength of plain reactive concrete at three-year decrease about 27 percent than the strength of plain reactive powder concrete placed at laboratory for three months, and elasticity modulus increases about 71 percent, axial peak strain decrease about 62 percent respectively .With the passage of time, plain reactive powder concrete appears more Brittle Features and less toughness.
Research on the Working Performance of Self-Compacting Concrete at Different Substitution Rates of Iron-Tailings
Authors: He Pei Xiang , Liu Bing , Hu Sheng
Published: December 2014

In this paper, iron-tailings was substituted for natural sand in self-compacting concrete(SCC). Iron-tailings SCC mix proportioning design at different substitution rates were made. Slump,slump-flow, the time T500(S) of the slump-flow reaching 500mm, J-ring test, U-flow test were used to evaluate the iron-tailings SCC mixture working performances at different substitution rates, which contrast to the common SCC working performances. Through the experimental results and their variation regulations, taking the single working performance into consideration,a reasonable range about the substitution rate of iron-tailings is obtained.
Simulation on the Thermal Stress of Super304H Oxidation Scale at 600°C
Authors: Chen Jun Wei , Jiang Zhen , Mu Hao , Wan Qiang , Hu Lei , Yang Bing
Published: December 2014

In this paper, based on the analysis of cross-section of steam oxidation of Super304H sample at 600°C, thermal stress contours were obtained by using finite element analysis through establishing geometric model and refine meshing. After extracting the stress in the interface of oxide layer and analyzing the thermal stress, it can be found that there exists compressive and tensile stress in the interface between substrate and scale, which is affected by the slope of the interface.
The Research Progress on New Adsorbent of Dealing with Heavy Metal Pollution in Water
Authors: Zhu Lin , Liang Mei Na , Huang Dao Lin
Published: December 2014

With the increasing of industrialization, the heavy metals cause serious pollution of water in China. This paper reviewed the study of many kinds of new adsorbent materials remove heavy metal from pollution water, these new adsorbent including modification activated carbon, inorganic absorbent material, industrial waste, biological adsorbents and synthetic adsorbent, and pointed out the trend of development of the new adsorbent material application in the future.
Stability Analysis of Surrounding Rock Based on QGA-SVM
Authors: Xie Fu Dong , Yang Wei Min , Qiu Dao Hong , Li Yi
Published: December 2014

In order to analyze the stability of surrounding rock accurately and effectively, a rock classification method based on QGA (quantum genetic algorithm)-SVM (support vector machine) is put forward. QGA was used for global search in the solution space to optimize the kernel function parameters of SVM. And this method improved the classification accuracy of SVM in rock classification. Finally, a rock classification model based on QGA-SVM was established and applied to practical engineering. The result shows that the improved SVM has a higher accuracy in stability analysis of surrounding rock.
Shape Optimization and Mix Proportion Design of Innovative Interlocking Mortarless Block
Authors: Chen Gong , Zhu Ming Qiao , Cai Yun Du
Published: December 2014

Mortarless interlocking blocks have the advantage of convenient construction and low cost, but establishing the geometry interlocking mechanism between horizontal blocks has been overlooked. Optimizing the shape of mortarless interlocking block. The connection of vertical direction in the form of a frustum of a cone, and the connection of horizontal direction in the form of trapezoid shape. This design proposal builds geometry interlocking mechanism between the block and its all adjacent ones. Setting cone and rectangular holes on block body, accordingly, block laying could forming taper vertical channel and rectangular vertical channel. The concrete of interlocking mortarless block has particularity, which is not suitable for “Mix Proportion Design of Ordinary Concrete Regulation” (JGJ55-2010) of China. This paper presents a platter idea to establish the concrete mix proportion design method of mortarless interlocking block, moreover, an example calculation and confirmatory experiment is dispensable.
Analytical Solution for Solving Bending Problem of Orthotropic Beams
Authors: Yang You Zhen , Ma Han Lin , Wang Hu
Published: December 2014

Based on the two-dimensional theory of elasticity, Hamiltonian system is introduced to solve the bending of orthotropic beams and the original problems come down to solve the eigensolutions of zero eigenvalue. The symplectic concept makes no hypothesis of deformation along the thickness direction. Thus, the current method can precisely analyze beams with arbitrary depth-to-length ratio, and can deal with arbitrary end conditions. In additional, a new improved boundary conditions for fixed ends beam is presented. Numerical examples showing comparison with other methods are given to illustrate the accuracy of the present approach.
Study on the Predominant Outward Joints Influence on the Stability of High Slope
Authors: Liu Chong Ping , Wang Tuan Le , Hao Wen Zhong , Qin Zhen Hua
Published: December 2014

The advantage outward joints connectivity rate (CR) which extend along the slope plays an important role to overall stability of the high rock slope, but less research on it has been done. In order to research the 180m high rock slope at water inlet of Wudongde hydropower station at Jinsha River, qualitative and quantitative analysis methods have been used. Based on the statistics of the outward joints CR which extend along the slope, and the weighted average parameters of the “bottom sliding surface” combined with the rock bridge, the stability factor of slope has been calculated by rigid body limit equilibrium method. According to the CR sensitivity analysis and calculation, the effect degrees of the joint connectivity rate to the slope stability, and the effect degrees of the bandwidth selection to the CR and stability factors in the bandwidth projection method of linear CR have been demonstrated in paper.