bluuebunny/crossref_metadata_2025 huggingface dataset:
Preparation and Performance of Diatomite Latex Paint for Interior Wall
Authors: Wang Li Yan , Xiao Xin Fu , Gai Guang Qing
Published: April 2014

A novel diatomite latex paint for interior wall was prepared succesfully. The as-prepared diatomite latex paint for interior wall meets the technical indicators of top quality goods in requirements of top-coat for interior wall (GB/T 9756-2009). The rational proportion of pigments and fillers is one of the key factors to decide the storage stability of latex paint system. The determination of binder ratio should also consider the effect of the emulsion on the microstructure of diatomite surface in the coating. The as-prepared diatomite latex paint for interior wall has versatilities of sound-absorbing, air purification and humidity control. It has a broad prospect of application and development in the fields of the environmentally friendly indoor decoration materials.
Recent Research of Shape Memory Alloy in Seismic Resistance
Authors: Song Xin Lei , Huang Cheng Wei , Wang Dan
Published: April 2014

Shape memory alloy has received widespread attention in seismic areas now, this paper introduce it develop in the field of earthquake in the past 5 years at home, mainly introduce the research in domestic of passive and active control, roughly summarized it in concrete girder bridge design and test, discussing the constitutive relations of SMA ,finally put forward the problems existing and development prospects .It indicate the direction of practical application in the future.
Research on the Performance of Silt Sintered Insulating Brick and Key Molding Equipment
Authors: Liu Hong Mei , Xu Yuan Bin , Wu Cheng Qun , Zhu Ai Dong , Zuo Jun Qiu
Published: April 2014

Silt sintered insulating brick with high strength, good thermal insulation and sound insulation characteristics. It occupies an important position in the new building materials industry. The main equipment for production of silt sintered insulating brick is the vacuum brick extruding machine, the forming mold is the most critical part in it. The performance largely determines the quality of the brick. The structural design and other aspects of the forming mold are analyzed, and then systematically summarize the design and production requirements of the forming mold. The research status of the forming mold on vacuum brick extruding machine at domestic and abroad is reviewed. The main problems of forming mold are analyzed and the corresponding solutions are given, as well as the future developments of forming mold.
Limestone and Dolomite Tailings Properties and Bricks Development
Authors: Mao Jing Min
Published: April 2014

The mud-containing and fine-grained tailings of limestone and dolomite, as raw material with poly chem soil binder (PCSB), can be used to produce load bearing bricks by means of preparation, measurement, mixing grind, molding, curing and other processes. The molding process parameters were obtained through the soil test of tailings. The curing strength was proved to be greater than C10-15 from the judging test. PCSB was optimized according to the curing and economic cost. The factors such as dosage form, tailings samples, density and water content were discussed in the orthogonal test. The mix of PCSB: tailings: process water =1:9:0.95 in quality was verified in the product test.
Adsorption Mechanism of Rectorite Modified by Lithium
Authors: Ming Yin An , Wang Ying Ru , Liu Zheng , Zhou Fu Rong
Published: April 2014

In this paper, the mechanism that lithium-modified rectorite (Rec-Li) and raw rectorite adsorbed methylene blue dye in wastewater was investigated, and the adsorption properties of the two adsorbents were also compared. The results showed that the static saturated adsorption capacity of raw rectorite was 77.75mg/g, however, the capacity of lithium-modified rectorite was up to 189.62mg/g, the adsorption efficiency was increased by 144%. Therefore, the adsorption capacity of Rec-Li to methylene blue was much higher than raw rectorite. The Rec-Li and raw rectorite were characterized respectively by means of fourier transform infrared spectrophotometer (FTIR), X-ray diffraction (XRD), scanning electron microscope (SEM) and colloid index measurement. The analysis indicated that, after modification by lithium, the colloid index was changed from 12mL/3g to 198mL/3g and the interlayer spacing was changed from 0.01~0.1μm to 1~1.5μm. With the increasing of the colloid index, the dispersion effect of adsorbent in wastewater and the contact area between adsorbent and pollutants were improved. And the increase of interlayer spacing was conducive to pollutants entering the hole and so that the adsorption capacity of Rec-Li was increased significantly.
Prediction Method of the Load Resisting Mechanisms in the Corroded RC Beams
Authors: Dong Wei , Oshita Hideki , Tsutsumi Tomoaki
Published: April 2014

The failure mode of the corroded RC beam may shift from designed failure mode to others failure mode, as the load resisting mechanism changes due to the corrosion ratio of rebars. In this study, the load resisting mechanism and the failure mode of the corroded RC beam were investigated based on the bond performance. If the corroded RC beam is non-uniformly corroded, the beam suffers beam action and fails in flexural failure. Otherwise, the load resisting mechanism and the failure mode depend on the corrosion ratio of bottom portion stirrups. Moreover, the decision point is proposed to predict the load resisting mechanisms in the corroded RC beam.
Materials Properties and Material Applications in a New Wood Flute back Combination Design and Research
Authors: Liu Yun , Li Zheng Ji
Published: April 2014

Wood flute back combination design [, experimental study to verify the practicality of wood back shocked. Development and application of wood back shocked, and replace the current wooden building construction template for the realization of environmental protection, energy conservation plays an important.
Study on Vinyl Ester Based Structural Anchor Adhesive for Fast, Low Temperature Cures
Authors: Zhu Ben Wei , Lin An , Gan Fu Xin
Published: April 2014

An high performance two-component structural anchor adhesive based on vinyl ester resin is synthesized by adding the toughener to improve the material brittleness and bringing in chemical heat source to reduce the affection of the environment on chemical reaction and it can be cured in the damp or in the environment with water by adding the water-absorbable filler.Compound stabilizer consisted of inhibitor and oxalic acid improve the stability of the pro-accelerated vinyl ester resin.The adhesive exhibites high-early-strength developing, excellent bong strength with “can’t dry”substrate and can cure rapid in lower temperature.it allows construction crews to install threaded rod or rebar in concrete that is too damp or soaked to bond with other adhesives.
A Keyword Query Method Based on Digital Type Properties
Authors: Zhao Juan , Xiong Hui Yun
Published: April 2014

Now, the way to access the database in most still uses a simple keyword query method, it is generally based on semantic matching, rather than based on semantic matching. So it can't make full use of the semantic relationship between the data, and unable to obtain accurate results. This paper proposes a keyword query method based on digital type, it can largely improve the efficiency of user queries. We propose two query algorithm namely multi-table query and single table query in the database query time of uncertainty. Through experimental analysis, we can see that our algorithm is more effective than simple type keyword queries.
A Method of Drawing Contour Basing on Membrane Analogy Method
Authors: Min Guo , Chen Hong Kun
Published: April 2014

It is common method that using landform key points and lines of landform to draw contours of large scale relief maps. In this paper ,It is discussed that using lamella analogue to draw contour of large scale relief maps is an another simple utility high effective method.
Modeling and Simulation of Ship Motion for Dynamic Positioning Vessel
Authors: Yu Pei Wen , Chen Hui
Published: April 2014

The paper presents a method to build MMG model of ship motion for a oil supply vessel (OSV) with dynamic positioning system. It is assumed that the ship motion exposed to environment disturbances like wind, wave & currents, The simulation results show that the model of the vessel and environment disturbances are suitable, and the method is practicable .
The Initial Retrieval Based on Image Segmentation
Authors: Zhan Qing Hua
Published: April 2014

Visual image, as a kind of rich content and performance of multimedia information, has been tremendously popular for a long time. Using text-based Image Retrieval TBIR (Text-based Image Retrieval, TBIR) during retrieval will provide keywords and description of the image text matching, operation simple and quick. The defects of TBIR also, however, there are the following: (1) image library image all the need for manual annotation, time-consuming and laborious with subjective factors; (2) image semantics is rich, simple key words cannot fully express its meaning and accurate. Image Retrieval Based on regional RBIR (Region-based Image Retrieval, RBIR) first of all, by using image segmentation method, divides an image into several different regions. At last image matching is converted to match between the regions. We just need to user submits a retrieval image, greatly reducing the user's retrieval burden.
Microwave-Ferrous Sulfate Modified Activated Carbon Adsorption Study on Phosphorus Removal
Authors: Li Ya Feng , Wei Chun Fei
Published: April 2014

Using microwave-ferrous sulfate modified activated carbon adsorption manner to remove the high concentration of phosphorus in wastewater. The power of microwavethe concentration of ferrous sulfate and reaction time on phosphorus removal were studied. When the power of microwave was 425W,the concentration of ferrous sulfate was 0.1mol/L,reaction time was 50 min,the removal rate of TP reaches 95.67%,the treated effluent TP can be dropped to 0.48mg/L,the TP can reaches the first effluent standard of TP in the comprehensive wastewater discharge standard (GB8978-1996).Microwave-ferrous sulfate modified activated carbon is adapted to treat high concentration phosphorus in the wastewater.
Snow Wind Tunnel Experiment for Snowdrift Prediction of Domed Stadium
Authors: Paek Sun Young , Nam Byung Hee , You Jang Youl , You Ki Pyo , Kim Young Moon
Published: April 2014

As baseball gets more and more popular the interest of fans increases. Since baseball game in its nature is influenced very much by weather the necessity of a domed stadium has been raised. At this moment a membrane structured domed stadium is under construction. As can be understood from the roof collapse of Minnesota Metrom by a heavy snowfall in 2011, the snow load occupies a very important part in membrane structure. To calculate the snow load snowdrift prediction is necessary and snow is piled mainly at the side or roof of a building. Hence, in this study a snowdrift wind tunnel test of a domed stadium was made to simulate snowdrift; using it the maximum depth of fresh snowdrift is estimated to be in the range of 3.4cm-37cm on the roof of a domed stadium.
Research on the Eco-Cluster and Low-Carbon Technology Innovation of Biomedicine Industry in China
Authors: Yan Shu Rong
Published: April 2014

OBJECTIVE:To provide reference for the eco-cluster and low-carbon technology innovation of biomedicine industry in China.METHODS:In the context of the construction of ecological civilization, To analyze the status and existing problems of Chinese bio-pharmaceutical industry cluster and to explore viable industry gathering mode and low-carbon technologies innovative ways.CONCLUSIONS:Ecological industry is the fundamental way out of structure optimization and upgrading of China’s bio pharmaceutical industry. The development of Chinese bio-pharmaceutical industry must take the path of ecological gather and the key step lies in the low carbon technology innovation of biopharmaceutical.
Stress and Stability Analysis of a Cooling Tower by ANSYS
Authors: Cao Mei Li , Qiu Xing Jun
Published: April 2014

In this paper the stress and stability of the domestic highest natural draft cooling tower under wind load, weight and temperature load are simulated by ANSYS. The wind load is proved to be the key load that must be considered in the stage of the design of a cooling tower. The maximum internal force is compressive stress and appears at the bottom, and the maximum buckling appears at the throat of the tower. The simulation result can be used to check the cooling tower during the design phase to avoid the accident.
The Effect of Splicing Area Parameters on Mechanical Behavior of Beam-Column Connection with Cantilever Beam Splicing
Authors: Pan Jian Rong , Yang Zheng Ting , Zheng Lin Qiang , Gao Rui Bin
Published: April 2014

This paper deals with the effect of splicing area design parameters on the mechanical behavior of beam-column connection with cantilever beam splicing. A series of models are designed based on the change of parameters. The mechanical behavior of beam-column connection with cantilever beam splicing is systematically studied by using the finite element analysis. The analysis results show that the number and arrangement of web bolt will have a great influence on mechanical behavior of the splicing joint when the number of flange bolt is designed by the precise design method; the number and arrangement of web bolt will have a less influence when the number of flange bolt is designed by the equal strength design method; Splicing area design parameters have little effect on the ultimate load and the initial rotational stiffness of the splicing joint; the number and arrangement of bolt is sensitive parameter for yield load of the splicing joint and the rotational stiffness in the the splicing area.
The Optimization Calculation and Analysis of Trough Solar Collector Bracket System
Authors: Li Ge , Zhou Lin Yong , Ai Zhi Dan
Published: April 2014

The parabolic trough-type collectors and new bracket system were accounted for the research object; static load and structural optimization were analyzed by ANSYS, and selected the best section size of the bracket with meet the strength and stiffness requirements. The results show that the original bracket structure almost meet the strength and stiffness requirements under normal working conditions; After optimization design, the weight of bracket system decreased by 10.68%, so greatly save the production cost under meeting the conditions of strength and stiffness requirements.
Thermal Effect Test of Outer Compressive Ring of the Roof of Bao'an Stadium
Authors: Deng Hui , Sun Xian Lun , Cao Yu , Zhang Xiu Liang
Published: April 2014

Based on the project of construction monitoring for cable structure of the roof of Shenzhen Baoan stadium, the displacement and stress of outer compressive ring caused by temperature change were monitored before the radial cable was tensioned, analyzed and compared the monitoring results. Comparing the measured results and simulation results shows the temperature change characteristics of outer compressive ring and the temperature change characteristics are valuable for delicacy construction of other similar projects.
Comparison of Stress-Strain Relationships of FRP and Actively Confined High-Strength Concrete: Experimental Observations
Authors: Lim Jian Chin , Ozbakkloglu Togay
Published: April 2014

It is well established that lateral confinement of concrete enhances its axial strength and deformability. It is often assumed that, at a same level of confining pressure, the axial compressive stress and strain of fiber reinforced polymer (FRP)-confined concrete at a given lateral strain are the same as those in concrete actively confined concrete. To assess the validity of this assumption, an experimental program relating both types of confinement systems was conducted. 25 FRP-confined and actively confined high-strength concrete (HSC) specimens cast from a same batch of concrete were tested under axial compression. The axial stress-strain and lateral strain-axial strain curves obtained from the two different confinement systems were assessed. The results indicate that, at a given axial strain, lateral strains of actively confined and FRP-confined concretes correspond, when they are subjected to the same lateral confining pressure. However, it is observed that, at these points of intersections on axial strain-lateral strain curves, FRP-confined concrete exhibits a lower axial stress than the actively confined concrete, indicating that the aforementioned assumption is not accurate. The test results indicate that the difference in the axial stresses of FRP-confined and actively confined HSC becomes more significant with an increase in the level of confining pressure.
A Case Study on the Use of Aluminum Forms in Nuclear Power Plant Construction
Authors: Kim Gwang Hee , Song Hyo Min , Shin Yoon Seok
Published: April 2014

Given the global trend toward the expansion of the use of nuclear power, Koreas nuclear power industry has begun to work actively to make inroads into foreign countries. As formwork accounts for about 25 percent of the entire duration of a construction project, including nuclear power plant construction, and requires considerable efforts, to achieve a reduction in construction duration, it is necessary to reduce the duration of formwork. In this study, an actual site where Alumimum Form (AL-Form) was used as a system form in a nuclear plant construction site was investigated and analyzed. Through the analysis, AL-Form was found to be sufficiently economically feasible to be utilized in nuclear power plant construction. However, there are slight differences between general system form and AL-Form, and to activate the utilization of AL-Form skilled workers should be cultivated for the formwork and specific technologies for the AL-Form work should be additionally studied in the future.
A Nonlinear Model for Beam-Column Joint Based on OpenSees
Authors: Ju Yan Zhong , Mu Yu , Wang De Hong
Published: April 2014

The beam-column joint is the key component of a RC structure and also the hub of stress transferring between beam and column. It is the major part for ensuring enough stiffness, ductility and good energy dissipation capacity of the RC frame. In order to simulate the beam-column joints under cyclic loading, a model based on OpeeSees was studied. OpenSees has advantages over other nonlinear analysis software in the improvement of algorithms. Comparison of simulated and observed hysteretic curve indicates that the proposed model is appropriate.
Experimental Measurement of Two-Dimensional Circular Boundary Temperature Field by Acoustic Method
Authors: Zhang Li Wei , Wang Ming Ji , Cao Wen
Published: April 2014

Acoustic thermometry method is used to measure two-dimensional temperature distribution of a circular boundary temperature field experimentally. The measured temperature field is compared with a point-by-point temperature measurement, the results shows that the acoustic method is consistent with the point-by-point measurement which proves that it is reliable to use this method to measure the two-dimensional temperature distribution.
Knowledge of the Construction Technique of the Multiple Leaf Masonry Façades of Palazzo Ducale in Venice with ND and MD Tests
Authors: Boscato Giosuè , Dal Cin Alessandra , Riva Gianna , Russo Salvatore , Sciarretta Francesca
Published: April 2014

This paper presents a first program of non-destructive tests carried out on two medieval façades and inside the main rooms of Palazzo Ducale in Venice, i.e. the room of Maggior Consiglio and the room of Scrutinio. A probably multiple leaf load-bearing brick masonry and an external cladding of polychrome stones compose these façades under investigation. The aim of the tests concern the improvement of knowledge about the construction technique and the mechanical features of these important historical facades. The program was set up after a preliminary historic investigation. Non-destructive and minor-destructive investigations (i.e. pattern surveys, endoscopic tests and georadar test) on the inner sides of the two walls of the area under examination were carried out for the analytical determination of the construction technique and structural characteristics, not clearly inferable from the literature.Due to the complexity of the structure and the transformations undergone in seven hundred years of life, and to the very limited investigable areas of the internal surface, the results of investigations cannot be extended to the entire structure. Nevertheless, these tests provide valuable clues to give a correct interpretation of the construction technique and to contribute to identify the possible mechanical properties, which provide knowledge about the health state of the building.
Modal Parameter Identification of Concrete Filled Steel Tube Arch Bridge Based on Stochastic Subspace Method
Authors: Wang Li Xian , Di Sheng Kui
Published: April 2014

Based on stochastic subspace method, the natural frequency of the bridge arch rib, damping ratios and vibration mold parameter was obtained by modal parameter identification of a concrete filled steel tubular arch bridge under ambient excitation, and the Midas Civil finite element software was used to establish a computational model of the bridge. Measured results and calculated results were compared, and the reliability of the identification results have been verified, the identified dynamic properties can be served as the basis in the finite element model updating, damage detection, condition assessment and health monitoring of the bridge.
Construction Control of a Continuous Beam Arch Composite Bridge
Authors: Zhou Chong Yang , Yang Jian Rong , Zhu Wei Min , Shi Jiao
Published: April 2014

The geometric shape and internal forces were monitored during the construction of the hypostatic framework structure which is a composite system of steel beam and arch. The displace settlement was measured for the control of the geometric shape. And nine vibrating wire strain gauges were embedded on the key sections for the real time control of internal force. In order to cancel out the interference of the temperature variation effectively, displace settlement and internal forces were monitored around the clock at different time points. Then the measured values were compared with the theoretical values. Based on the measurement of temperature variation and strain, the settlement during the process of frame construction can be surely ascribed to thermal stress in the high redundancy structure. It should pay close attention to the changes in the future similar steel Beam Arch Composite Bridge construction and monitoring system.
The Vibration Modal Displacement Component Method of Identifying the Crack Damage from Simple Supported Beam
Authors: Fang Zhi Hua , Liu Xiang Yang
Published: April 2014

Engineering structure often produces the crack in the use of a certain year, the crack will decline the stiffness of structure which affects the safety of the structure and the vibration characteristics of structure. A method of identifying the crack damage from beam by using the vibration modal displacement component to strutting the damage identification was put forward, the finite element models of beam which no crack, different position and different depth were established, the damage displacement modal parameters of beams pre and post were calculated, the change rule that the displacement modals variation of transverse component and displacement modals rate of change of axial displacement difference along with the different of the cracks depth and position was analyzed., The calculations showed that the sensitive to the crack position and depth along the crack direction displacement modal transverse component variation and change rate of the axial displacement difference can be used as the basis for crack damage identification of beam.
Development of On-Site Fast Detector Used for Waterproof Membrane Joint Peeling Strength
Authors: Xu Jia Long , Zheng Yi , Wang Tang Xi , Du Peng , Liu Ze Hua
Published: April 2014

Development of on-site fast detector using for waterproof membrane joint peeling strength has improved the waterproof membrane on-site construction quality evaluation level and construction quality decision capability. Detectors capabilities in two-dimensional movement and multi-angle detection fill the domestic gap. Verification test result of the detector shows that, the peeling force will fluctuate within certain scope with peeling of joints; the longer the membrane is stretched, the greater the error is; the error caused by angle deviation is about 7% and error caused by joint deviation is about 4%, and the test result satisfies the evaluation requirement on waterproof membrane joint peeling strength at construction site. The development of detector improves the construction quality, construction management and acceptance of waterproof membrane.
Construction Technique of Cast In Situ RC Grillage Shear Wall Building Formed with Thermal Insulation Hollow Blocks
Authors: Zhang Wei Jing , Zhang Qian , Fu Pei Ru
Published: April 2014

The cast-in-situ reinforced concrete grillage shear wall system with non-dismantling formwork is a new type of structural system characterized by load-bearing and thermal insulation, and the research on the construction technique is crucial to its promotion and application. Combined with the pilot building, the key technology and construction measures are introduced in this paper, which can provide reference for the related projects in future.
A New Reinforcement Measure Suited for Space Truss with No-Fire Operation
Authors: Mei Zuo Yun , Liu Chuan Qing , Mi Xing , Wu Ping
Published: April 2014

A new reinforcement measure with no-fire operation is presented, which is very suitable for space trusses which are located in gas stations. A finite element model (FEM) is presented with shell elements and multipoint constraint elements. With this FEM, nonlinear analyses are carried out. Analytical results show that integral failure of reinforced pipe is caused by yielding of original pipe inside. So it is not necessary to reinforce original pipe using steel pipe bonded outside with high yield strength. With the increase of length of bonded pipe outside, loading according to elastic stage and ultimate bearing loading increase, it is clear that the length of bonded pipe outside is an important factor which influences the bearing capacity.
Review of the Study on the FRP Strengthened Masonry Walls
Authors: Zhao Jing , Sun Wen Bin , Yong Hong Bao , Zhu Qiang Qiang
Published: April 2014

FRP is a newly advanced composite material, whose convenient construction technique and excellent rehabilitation effect are generally agreeable by the circles of civil engineering. The studies on FRP strengthened building are one of leading issues on the field of civil engineering. Based on large quantities of latest relative documents, FRP strengthened masonry walls are summarized, and some issues needed to be studied are also presented.
Damage Location Identification of Truss Structure Based on Strain Modal Method
Authors: Ding Bei Dou , Tang Ming , Shang Ya Nan
Published: April 2014

Due to the fatigue load and bad corrosion environment, truss structure in service will form the damage accumulation, damage detection of potentially damaged elements of truss structures is a challenging topic. According to the element stress characteristics of truss structure, structural element strain mode mainly based on the vibration displacement is derived, the change of elemental strain modal is proposed as the dynamic indicator for damage location identification of truss structure. Based on the numerical simulation study of the actual truss structure indicates that, the loworder elemental strain modal method is not only sensitive to damage identification of chord element and web element of truss structure, but also is effective to locate the damage of different position, and is suitable for damage alarming of truss structure in service.
Dynamic Model Scheme Optimization Based on Fuzzy Decision Theory of Self-Anchored Cable-Stayed Suspension Bridge
Authors: Feng Miao
Published: April 2014

Based on fuzzy decision theory, multi objective fuzzy optimization is done for three dynamic model scheme of self-anchored cable-stayed suspension bridge. Combining the fuzzy decision method with engineering practice and using two comparison theory solves the problem of quantifying the qualitative indexes. Comparison results show that it is more reasonable to place viscous dampers between main tower and girder, with longitudinal displacement on mid-span of girder on the same time. This method can provide a reference for structure selection in practical conceptual design phase.
Hybrid Vibration Control of Self-Anchored Cable-Stayed Suspension Bridge
Authors: Feng Miao
Published: April 2014

Larger displacement and inter-force response of the structure will be produced when self-anchored cable-stayed suspension bridge in longitudinal earthquake. The optimized layout of viscous damper is done for self-anchored cable-stayed suspension bridge with the lead rubber bearings in the main tower, moreover, the nonlinear time-history analysis in the longitudinal seismic input be made. Comparing the analysis results above between the scheme with viscous damper and the scheme without isolation measures, analysis results show that inter-force and displacement of control section and control node are reduced greatly in hybrid vibration control.
Investigation on Nonlinear Vibration of the Cable in Cable-Stayed Bridge in 3D Space
Authors: Wang Tao
Published: April 2014

Cable-stayed bridge is main kind of modern large-span bridges. Wind load and vehicle load are main dynamic force on cable stayed-bridge, which can cause large amplitude vibration of cables. In the paper, the nonlinear vibration differential equations of cable with dynamic displacement at its end point in 3D space was derived. The differential equations were analysed by the method of multiple scales and the vibration characteristic was discussed. The differential equations were solved by numerical method. The Trajectory of the cable middle point was plotted. The result of this paper indicated that the vibration amplitude of cable in 3D space is relate to the frequency and amplitude of the dynamic displacement of the cable end point. The results in the paper could be a reference for the research of cable vibration in cable-stayed bridge.
Key Technologies Research in Incremental Launching Demolition Construction of Beijiang Bridge
Authors: Lin Wen Xi , Xu Dao Li , Yang Chao , Jia Bu Yu , He Zhen Zu , Chen De Yi
Published: April 2014

Because of dredging waterways, navigable rank of Beijiang Bridge needed to improve to National III level,it was necessary to remove the old Beijiang Bridge, building a new Beijiang Bridge at the same time and the same position. In view of problems as difficult to install launching nose, not enough space to remove beams,stability of the last removed box beam emerging in the process of removing, desiging and installation platform, cutting beams platforms, last-hole assisted platforms,in order to analyse force situation of the guiding beam in the process of push, using finite element software ANSYS to establish launching nose model, by simulating guiding beam at the bottom position by adding reverse force. At last, study guide beams in the up-push limit deviation technology, there was a conclusion: the building of a launching platform, cut beams platforms, last-hole assisted platforms improves the security and the stability of the construction, saves the construction space without damages in the guiding beams, forces conforming to real situation, pushing the limit deviation correction system, ensures box girder deviation in the allowed range. Key technology research in main up-push remove of Beijiang Bridge can be used for other similar bridge engineering.
Optimal Design of Suspension Bridge Based on Minimization of Life Cycle Cost
Authors: Bang Myung Seok
Published: April 2014

This study was intend to develop the optimal design method of suspension bridge by the reliability analysis based on minimization of life cycle cost (LCC). The reliability analysis was performed considering aleatory uncertainties included in the result of numerical analysis. The optimal design was estimated based on life-cycle cost analysis depending on the result of reliability analysis. As the effect of epistemic uncertainty, the safety index (beta), failure probability (pf) and minimum life cycle cost were random variables. The high-level distributions were generated, from which the critical percentile values were obtained for a conservative bridge design through sensitivity assessment.
Design Analysis of Steel Frame for Denitrification through Existing Structure
Authors: Liu Cheng , Cao Ping Zhou
Published: April 2014

Construction of denitrification system is an important environmental engineering in power industry now. Denitrification system is always set over the blower bracket, frame for denitrification needs to pass through existing structure if blower bracket works together with boiler frame. Based on the denitrification project of a power plant in north China, this paper puts forward reasonable structural arrangement of steel frame through existing structure, which is that frame for denitrification works alone and the column affected by existing structure selects solid-web column with openings. The beam supporting SCR reactor could be simplified as a beam under dead load only. Optimal design of its section in simplified model can improve design efficiency and economize the cost. The critical load of special column with bracings can be obtained by the linear elastic buckling analysis and effective-length factor can be calculated according to Euler Formula.
Research on Mechanical Behavior of Box Girder with Corrugated Steel Webs of Cable Stayed Bridge
Authors: Lv Liang , Liang Bin
Published: April 2014

Mechanical behavior of box girder with corrugated steel webs in completion status of bridge was studied. Based on the cable stayed bridge of box girder with corrugated steel webs on Zhenshui Road in Xinmi City, finite element method (FEM) was applied to calculate and analyze vertical displacement of box girder, shearing stress of corrugated steel webs, normal stress and vertical deflection of concrete plates, longitudinal strain of box girder in completion status of bridge. The results show that vertical shearing stress of corrugated steel webs is approximately uniformly distributed along the height of box girder. Vertical deformations of corrugated steel webs play the dominant role in the whole box girder. Longitudinal strain of corrugated steel webs is smaller than that of concrete plate. Structural design method based on traditional theory that corrugated steel webs bear all the shear force is conservative. Keywords: box girder with corrugated steel webs; cable stayed bridge; deflection; stress; strain
Research on the Wave Load Effect Based on Time History Analysis of Donghai Island Bridge
Authors: Yuan Wei Guo , Liu Mu Yu
Published: April 2014

The Dissertation, relying on the construction of Zhanjiang Donghai Island Sea-crossing Bridge and adopting the finite element analysis method to calculate the wave force of substructure, proposes the bridge structure analysis method based on dynamic time history of wave loads. Through emulation analysis, structural load effect under waves is attained, making it a theoretically rational foundation for the structure selection and reinforcement of substructure of Donghai Island Bridge and having important theoretical significance and practical value in guaranteeing the bridge security under any seismic sea waves.
A Constitutive Model with Effect of Temperature for Frozen Soil
Authors: Xu Xiang Tian , Fan Cai Xia , Zhang Tian Yu
Published: April 2014

To model the stress-strain relation of frozen soil under different temperatures, an elasto-plastic constitutive model coupling with temperature variable was proposed. Under axisymmetric condition, elastic strain was calculated by the K-G model coupling with temperature. The plastic strain was calculated by using the DP yield criterion, associated flow rule and isotropic hardening law. All of the elastic and plastic parameters are related to the temperature variable. The simulated results show that the proposed model can predict the deformation behavior of frozen soil under different temperatures.
Analysis and Study on Slope Stability of High Fill Subgrade
Authors: Zhang Qi
Published: April 2014

The slope failure of high fill embankment have a large proportion under self-weight and external conditions,Because of the complexity of the soil deformation and stress,General methods such as the limit equilibrium and numerical analysis have their own limitations,The paper takes high fill subgrade engineering in Fujian province as the background.Adopting analytical method and finite element method calculate the stability coefficient and lateral displacement of high fill embankment slope.moreover,Making a comprehensive judgement to the stability of the slope by comparing with the actual value.The results show that calculation results of these two methods are close.Which can make accurate predictions on high slope stability and determine a judgement.and provides an effective method for the design and construction of the similar project.
Design and Numerical Simulation on Concrete Two-Way Slab Strengthened with Partially Bonded Steel Plate
Authors: Hu Ji Hong , Li Xiu Cai
Published: April 2014

Taking structure strengthen of a large hotel as the engineering background, based on superposition principle, put forward the design method of concrete two-way slab strengthened with partially bonded steel plate. According to the finite element analysis, the solid finite element model is established, and then the stress, strain and deflection of two-way slab strengthened with bonded steel plate is obtained, at the meantime compared with the load test datum in situ. The analysis results show that the finite element software is a reliable tool applied to analyze the design of two-way slab strengthened with bonded steel plate. When the increasing load is larger, partially bonding steel plate strengthening has more advantage and economize than bonding carbon fiber strengthening on two-way slab, meanwhile that slab strengthened with partially bonded steel plate has better mechanical properties, strength and stiffness.
Analysis of One-Dimensional Thermal Consolidation for Saturated Soil Considering Different Permeabilities
Authors: Guo Cai Xia , Wu Rui Qian
Published: April 2014

Based on the analytical solutions of pore-water pressure and settlement. Problems of the one-dimensional thermal consolidation of saturated soil considering three different permeabilities were analyzed. Aiming at each permeability of thermal consolidation theory, compared with the corresponding Terzaghis consolidation theory, the one-dimensional thermal consolidation behaviour of saturated soil was analyzed in terms of excess pore-water pressure, the settlement. The results show that the permeability plays an important role in the thermal consolidation. The more permeability, the quicker pore-water pressure dissipation and the rate of settlement. Settlement of ground is more sensitive to temperature condition than the excess pore-water pressure. The behaviour of excess pore-water pressure in the process of thermal consolidation is very similar to the corresponding Terzaghis theory.
Analysis the Influence of Non-Prestressed Reinforcement for Horizontal Bearing Capacity of PHC Pipe Pile
Authors: Xi Pei Sheng , Sun Xiao Kai
Published: April 2014

We analyze the configuration of the non-pretressed reinforcement impact on the level of bearing capacity of PHC piles to effectively solve the poor performance of the general bending of pretressed concrete pile,using ANSYS finite element analysis software,through configurating the pretressed concrete pile with appropriate amount of ordinary non-presressed reinforcement.The results of numerical calculation show that the performance of PHC pile bending has been greatly improved and the deflection and bending when cracking were significantly better than ordinary PHC pile with the confiuration of non-prestressed reinforcement. We also analyze the effect of non-prestressed reinforcement and prestressing steel when the concrete piles cracking,datd shows that prestressing steel reached stress yielding firstly.The results provide a theoretical basis of the application of precast piles in the foudation ditch support project.
Discussion on Application of Empirical Formulas for Ultimate Bearing Capacity
Authors: Jin Hui Wu , Song Hong Wei
Published: April 2014

Terzaghi equation is widely used in practice to determine Ultimate Bearing Capacity (UBC). Recent research indicates that exact solution of UBC could be got with the slip line method if the soil is ideal elastic-plastic material. In this paper, dimensionless UBC is gained using ABC software based on the slip line method and is compared with that by Terzagh equation with based on empirical formula. It shows that error of UBC is caused by empirical formula. However, the accuracy of UBC relates to safety and economy of the engineering. Given empirical formulas have a wide application in practice, the scope of application of the four classic empirical formulas is discussed in different range of allowable error. The applicable scope of the four classic empirical formulas within the margin of error is discussed and the results can facilitate the application of classic empirical formulas in practice.
Effects of Ice Content on Mechanical Behavior of Frozen Loess under Uniaxial Compression
Authors: Xu Xiang Tian , Fan Cai Xia , Yuan Jun Hong
Published: April 2014

The uniaxial compressive tests on frozen loess with different ice content under loading rate of 1.25mm/min at-6°C are carried out to investigate the effects of ice content on the mechanical behavior of ice. The influence of ice content on stress-strain, elastic modulus, strength and failure strain of frozen loess are analyzed based on the experimental data. The results show that strength and failure strain increase with increasing of ice content. The elastic modulus first increase and then decrease with increasing of ice content.
Experimental Study and Numerical Simulation on the Large-Sized Models of Micro Anti-Slide Piles
Authors: Tang Xiao Song , Zheng Ying Ren , Xin Jian Ping
Published: April 2014

Micro antislide pile is more and more widely used in the emergent repair of landslide. But systematic and complete understanding about its antislide and failure mechanism is still insufficient; in addition, the theoretical study lags far behind the practical application. Through largesized physical model experiment and numerical simulation, the paper analyses the failure mechanism and failure mode of micro antislide piles in soil slope. The experiment and numerical simulation prove the fine antislide effects of micro piles, which allows large displacement of sliding mass and can delay the collapse of slope effectively, so it is applicable for emergent repair. The deformation of micro antislide pile is “S” shape, which is the tensile failure and shearcompression failure of concrete by bending deformation. At the same time, tensileshear failure happens on the reinforced bars. The largest shear of pile is located on the sliding surface and all the largest bending moment is above the sliding surface. The bending moment on the first row of plies is the largest followed by the third row and that on the second row is the smallest.
Influence Factor on Dilatancy of Coarse-Grained Soil Based on Large-Scale Triaxial Test
Authors: Chu Fu Yong
Published: April 2014

Abstract：Using large-scale shearing device, K0 consolidated-drained triaxial test and isotropiclly consolidated-drained triaxial test under different confining pressures are performed for overburden material of ShuangJiangKou earth dam which relative density is 0.9. And meanwhile, isotropically consolidated-drained triaxial test under different confining pressures are also performed for overburden material of ShuangJiangKou earth dam which relative density is 0.8. The difference of strength and deformation between under under K0-consolidation condition and isotropic consolidation condition and between under different relative density, and the influence of confining pressure, relative density and consolidation condition on the dilatancy of coarse-grained are analyzed. The results show that the strength of K0 consolidated-drained triaxial shear test is slight greater than that obtained by isotropically consolidated-drained test. The strength of coarse-grained soil increases with increase of relative density.The volume strain value of isotropically consolidated-drained triaxial shear test is bigger than that of K00 consolidated-drained test, and the volume strain value decreases with the decreases of relative density. The dilatancy of coarse-grained soil decreases with the increase of confining pressure, and increases with the increase of static lateral pressure coefficient.
Influence of Existing State of Pore Aqueous Solution on the Swelling Pressure of Expansive Soils
Authors: Huang Zhi Quan
Published: April 2014

The paper studies the influences of pore aqueous solution on the swelling pressure of expansive soils through the constant volume swelling pressure experimental experiment. The results indicate that the swelling pressures decrease with the increasing of solution concentration. In the experiment, two specimens made of the same solutions concentration are immersed into solutions with two different concentrations, one less than the solution concentration used to prepare specimen, and the other same to that. The results shows that the swelling pressures of two specimens gained from the experiment are very close. The analysis on the existing state of the pore water shows that the experimental result is agree with the osmotic pressure theory.
Numerical Simulation of Unloading Zone Division for Excavated Rock Slope
Authors: Wang Xing Xia , Deng Chen Jing
Published: April 2014

Excavation unloading zone corresponds to stress decreased area of slope rock mass after excavation. Quality of slope rock mass in this area will be degraded due to excavation disturbance, and the mechanical parameters of rock mass will be also degraded accordingly. Therefore, determining the range of excavation unloading zone accurately is one of the key factors to ensure the rationality and validity of numerical simulation results of rock slope excavation. In this paper, the range of excavation unloading zone is determined by comparing stress field before and after excavation, choosing stress component perpendicular to excavation face as comparative standard in calculation, which can be calculated by computer program with FLAC software. Stress adjustment of slope rock mass due to excavation is a dynamic and changing progress, so the range of excavation unloading zone is changing during excavation, which can be achieved by a cycling program in numerical simulation. The correctness and usefulness of this method is proved by the calculation results of example analysis.
Numerical Tests on Laterally Loaded Drilled Shafts Socketed in Rock
Authors: Yuan Shuai Jie , Zhang Kun Yong , Liu Zi Jian , Li Jian Cheng
Published: April 2014

Ultimate lateral bearing capacity of rock mass is the base of the research of laterally loaded drilled shafts socketed in rock mass. The ultimate bearing capacity is often not available because of the limitation of loading ability in field tests. Numerical tests are used here to simulate the drilled shafts socketed in rock mass and expand the load-displacement curve obtained from field tests. Common methods of determining ultimate lateral bearing capacity are also analyzed and compared here. At last, a relatively accurate method of determining laterally loaded drilled shafts socketed in rock mass is recommended.