bluuebunny/crossref_metadata_2025 huggingface dataset:
Dynamic Monitoring of Concrete Structure Using Piezoelectric Sensor
Authors: Qin Lei , Wang En Rong , Tian Kai Ge , Wang Xiao Dong , Shi Yue Hua , Qin Qi , Hua Zheng Xiao
Published: December 2014

Dynamic response of civil engineering structures was monitored in the paper, on basis of the excellent properties of piezoelectric smart sensor. There were two experiments: One was to study the relationship between the loading frequency and the piezoelectric sensor output by concrete block cyclic loading test; the other was to study the relationship between the sensor output and the stress amplitude by steel cantilever beam dynamic test. The results show that piezoelectric sensors have a good linear output performance.
Evaluation of Minimum Stirrups Ratio in Reinforced Concrete Flexural Members
Authors: Duan Shi Ming , Zhou Dong Hua , Han Chun Xiu
Published: December 2014

The minimum web reinforcement specified by many codes of practice is intend to maintain adequate reserve strength and ductility. So, reasonable value of minimum stirrup ratio in reinforced concrete flexural members is a noteworthy problem, which is to prevent members occur inclined tension brittle failure in shear design. Especially in seismic design, in order to ensure the structural members to achieve ‘strong shear weak bending’ the condition, reasonably determine the minimum stirrup stirrup ratio is a key component to ensure ductile failure occurs. Analogy to determine the principles flexural members minimum reinforcement ratio, combined with European norms to determine the principles of the minimum rate of stirrup, an expression has been proposed in non-seismic reinforced concrete beam shear design with considering the ratio of shear span. The minimum shear reinforcement predicted by the proposed expression makes the required minimum stirrup ratio have been harmonized in shear design of both cases which in general flexural members and under concentrated load members.
Experimental Research on Factors Affecting Factors of Concrete Strength in Corrosion and Expanding Areas at Initial Stages of Reinforcement
Authors: Zhang Xi De , Zhou Zhen , Li Guo Zhu
Published: December 2014

This studypaper analyzed the affecting factors affecting of strength of concrete in corrosion and expanding areas at initial stages of reinforcement corrosion by experimental resultss, and researched the transformation trend of experimental factors by difference analyzing in statistics. The results showed that the expanding force after steel corrosion remarkably influenceds the strength of concrete. At the same time, the reinforcement diameter and thickness of concrete cover also had clear influence on concrete strength when rust occurroccurrenceed. Therefore, when studying the influence of corrosion and expanding force on concrete strength, we should not only research the influence of reinforcement corrosion magnitude, but also consider other effects, such as steel diameter, thickness of concrete cover should be considered.
Finite Element Analysis of Stability Bearing Capacity in Moment Plane of Castellated Steel Components
Authors: Liang Zhen Yu , Geng Lin
Published: December 2014

Recently, polygon hole castellated steel beams have been studied and applied which had better social and economic benefits. But it brings more difficulties to extend castellated steel components that less studies of castellated bending members. In this essay, ANSYS that is a kind of finite element software had been used to analyze castellated bending members, and characteristics of stability bearing capacity in moment plane of regular hexagon hole castellated steel components had been studied that can provide references to engineering design.
Overhead Floor Research of Steel Structure Building
Authors: Wang Chun Gang , Wang Da Chuan , Li Guo Chang , Wu Jin Guo
Published: December 2014

In the decoration integration of steel structure, overhead floor achieves a separation of decoration and structure. Overhead floor system is composed of steel bracket, beam and floor. Reasonable overhead floor structure to ensure the safety of the whole structure has important significance. In this paper, the new form of beams named the cold bending cap steel is proposed and the size design of the new beam is made. While maintaining the original beams on the basis of mechanical properties, the new form of beams increase effective use height above the floor. In addition, the construction technology, construction requirements, the error control of overhead floor system, etc. are summarized and some author's suggestions in terms of modular are made.
Parameter Analysis on Bearing Capacity of Concrete-Filled Square Steel Tubular Column to Steel-Encased Concrete Composite Beam Joint with through Diaphragm
Authors: Lin Yan , Zhou Xue Jun , Liu Yu Chen , Kong Wen Qing
Published: December 2014

A new type of concrete-filled square steel tubular column to steel-encased concrete composite beam joint is proposed. In order to study the influences of parameters on bearing capacity for the joint formed plastic hinge in the beam end, nonlinear finite element analysis under monotonic loading is conducted by software ANSYS. The results show that axial compression ratio has little influence on joint bearing capacity, and with the increasing of it, the bearing capacity is enhanced slightly. The height of U-shape steel has a significant impact on joint bearing capacity, and with the rise of it, the bearing capacity is enhanced obviously. The thickness of U-shape steel has a comparatively obvious effect on joint bearing capacity with certain limits, and with the growth of it, the bearing capacity of the joint is also grown observably. The diameter of longitudinal reinforcement in the flange slab of beam has some effects on joint bearing capacity, and with the improvement of diameter, the bearing capacity is achieved.
Research on Safety Evaluation System of Reinforced Concrete Structures Based on the Blasting Damage
Authors: Zhu Guo Quan , Tao Jun Lin , Liu Xiao Ling
Published: December 2014

The safety of reinforced concrete structures will be impacted by the explosions. Using the calculations result of finite element analysis software, combining with database technology, a security level evaluation platform of blasting damage in reinforced concrete structures is established. The platform assesses the safety of damaged structure from the remaining bearing capacity, maximum crack width and maximum deflection, etc. It gives the security level from different aspects of the structure and the integrated security level, and repair advice.
Research Precast Fool Slab of Massonry Building Roof Reinforcement Methods
Authors: Li Li Xin , Zhao Zi Qiang , Zhang Shao Wu , Shi Zhu
Published: December 2014

Most of the existing building floor roof of brick structure is precast floor slab structures, which structural integrity is not good. In the earthquake, the floor is easy to fall off from the wall, causing casualties and economic losses. Vertical bearing capacity of precast floor slab are usually able to meet the requirements. In most cases the floors have been fall off from the wall before the floors were damaged, Stability of the outer plane of the floor itself to be adequate.By analyzing the patterns and characteristics of precast floor slabs crack under seismic force often appear, this paper presents that the prefabricated floor flat overall reinforcement scheme, which the application of steel band with end portion of the floor a holistic reinforcement,and finite element software ABAQUS be counted cases,the integrity of the reinforced floor to achieve significant improvement, and maximum allowable displacement can be controlled within a limited value.
The Finite Element Analysis of Mechanical Behavior of New Connection
Authors: Wang Chun Gang , Wang Xu , Li Guo Chang , Wu Jin Guo
Published: December 2014

Purlin connections have important influence on the stiffness, bearing capacity and the purlin calculation methods. A new kind of purlin connection was put forward in this paper. The mechanical behavior of the new connection was studied by finite element analysis using software ANSYS. As can be seen from the simulation results, the new connection can enhance the stiffness of purlin, and effect of each new wave connection is better than the promotion of purlin stiffness in the vibration wave connection. New connection has a better promotion effect for small stiffness of purlin.
Research on Bearing Capacity of Explosive Expansion Steel Piles
Authors: Shan Sheng Feng , Du Yong , Huang Shao Liang
Published: December 2014

As an improvement form of deep foundation, belled steel’s engineering research and application has matured. On the basis of belled steel pile, a new form of steel piles, explosive expansion steel piles, is proposed. Based on ABAQUS, the two-dimensional axisymmetric finite element contact model of pile and soil is set up. The parameters include: the diameter of the expanding section and highness of the expanding section have been analyzed through the Q-S curve. The results show that: the vertical bearing capacity increases significantly with the increase of the diameter of the expanding section, but decreases with the increase of the highness of the expanding section
Properties of Recycled Aggregate Concrete Filled Steel Tubes
Authors: Huang Yi Jie , Sun Huang Sheng
Published: December 2014

A review on the properties of recycled aggregate concrete filled steel tubes (RACSFT) was presented, followed by the short overview on the related researches. The uniaxial mechanical behavior, flexural performance, creep performance as well as eccentric loaded behavior of RACSFT specimens were discussed. It was found that the differences between the element made of recycled aggregate concrete (RAC) and that of natural aggregate concrete (NAC) could not be ignored. The performance of the RACFST is inferior to that of natural concrete filled steel tube (CFST). But, the RACSFT can be applied into structural elements safely. Based on the test results, it was also concluded that the RACSFT is an effective method to improve the application of RAC.
Round Timber Joints under Tensile Loading Perpendicular to the Grain
Authors: Klajmonová Kristýna , Lokaj Antonín
Published: December 2014

This paper presents the results of static tests of non-reinforced round timber bolted joints with slotted-in steel plates loaded perpendicular to the grain. This type of joints loading is particularly widespread in truss structures. Round timber test samples series were prepared to validate the behavior of a joint loaded in tension perpendicular to the grain. The joints samples were experimentally tested in the laboratory of the Faculty of Civil Engineering VŠB TU Ostrava. The test results were compared with the calculated load-carrying capacity of joints by Johansen’s yielding theory.
Application of Neural Network in Analyzing Torque Coefficient of Hot-Dip Galvanized Fasteners
Authors: Yu Hong Yun , Li Rui , Qian Miao , Li Guo Yong , Yu Min Bo , Zhu Zhi Hua , Li Zhou Xuan
Published: December 2014

Hot-dip galvanized fasteners are key connecting components on power transmission towers and structures. In order to improve the installation code of galvanized fasteners, this paper establishes a three-layer (BP) neural network by using the friction coefficients between threads, nut bearing surface friction coefficients and the associated torque coefficients. In addition, the neural network is trained to predict the torque coefficients of fasteners. It can be seen from the research results that the torque coefficients fall within [0.355, 0.709]. Subsequently, the prediction capability of neural network is verified through tests and statistics upon real galvanized fasteners, proving that BP neural network is an effective model.
Earthquake Damage Forms of Multi-Story Brick Masonry Structure and their Mechanical Analysis
Authors: Liu Hong Biao
Published: December 2014

In order to know seismic damage characteristics of multi-story brick masonry structure and improve its seismic capability, five kinds of earthquake damage or collapse forms of multi-story masonry brick structure are summed up based on earthquake disaster survey, each of which is analyzed with mechanics. And the failure mechanism of each seismic damage form of multi-story brick masonry structure are proposed, which provides effective engineering experience for the seismic or anti-collapse design of multi-story masonry brick structure. The research has the important significance in improving the seismic capacity of multi-story brick masonry structure and reducing the earthquake casualties.
Seismic Experimental Study on Masonry Structure Strengthened by Ring-Beam and Constructional Column
Authors: Qu Tie Jun , Xu Rong Huan
Published: December 2014

A full scale masonry model of two-floor and single bay was built in this paper and was strengthened by ring-beam and constructional column. And then pseudo-dynamic testing was conducted to study the time-history curves of displacement, velocity, acceleration response and restoring force in 7 degree rarely earthquake. Results show that the earthquake performance is steady and there are no visible cracks on the model after the testing. Windows and doors perform well because of the constraint of ring-beam and column, whereas failures often occurred when the structures were not strengthened. Seismic performance is largely improved by ring-beam and constructional column and the structure can resist 7 degree rarely earthquake.
Seismic Parameter Research of Marine Soil
Authors: Li Dong , Wang Xiao Yan , Lv Xiao Fei , Chen Xiao Ling
Published: December 2014

In East China Sea, especially in Zhejiang and Fujian Provinces, classic marine deposit soft soil with characteristics of high compressibility, high sensitivity and low strength is widely distributed. Seismic subsidence occurs under earthquake causing substantial losses. Though a number of effective studies are carried out on the causes, mechanisms and methods on seismic subsidence, there are more other aspects to be studied due to marine soil’s complexity. In this paper, the classic marine soft soil in southern sea area of Taizhou Bay is studied on its seismic parameter based on the tri-axial seismic experiment. The seismic parameters and residual strain formula are obtained, and compared with normal continental deposit soft soil.
Analysis on Seismic Performance of Rectangular Thin-Walled Hollow Pier
Authors: Xiao Xiao , Liu Sheng Bo , Xu Qi , Meng Lin
Published: December 2014

In the thesis, simulated analyses of six large-scale abutments under the low reversed cyclic horizontal load were performed by using the nonlinear finite element software of ABAQUS. The hysteresis behavior, skeleton curve, displacement ductility energy-dissipating capacity of the thin-walled hollow pier under the combined action of the bending, pressing, and shearing were discussed in this thesis. And it also analyzed factors that affect the bearing capacity and ductility of the bridge pier, such as the longitudinal reinforcement ratio, volume-stirrup ratio, the axial load ratio. Results indicate that the volume-stirrup ratio is the principal factor which affects the seismic performance of thin-walled hollow pier. With the increment of volume-stirrup ratio, the ductility factor increases; as the axial load increased, bearing capacity increased correspondingly; when the piers are under higher axial pressure, the longitudinal reinforcement ratio has more significant effect on the bearing capacity of structure.
Shaking Table Test on 145 kV HV Reactor Composite Bushing
Authors: Sun Yu Han , Liu Wen Ying , Su Zhi Gang , Liu Zhen Lin
Published: December 2014

As a key component of power transmission and distribution systems, HV reactor bushing made of porcelain have suffered serious damage in previous earthquakes. In order to enhance seismic ability, the new type bushing made of composite material have been used in high seismic fortify-cation intensity projects. The test requirement in this analysis included: the selection of dynamic magnification factor、the selection of excited wave、the control of tolerance between input peak acceleration and output peak acceleration. During the shaking test, the dynamic characteristics, including frequency and damping ratio, and the seismic response of the composite bushing was obtained. Based on the analysis results of the bushing, the judgment of the seismic capacity was achieved.
Study on Seismic Fortification Level of Electrical Equipment
Authors: Zhong Min , Sun Yu Han , Zhang Qian , Liu Zhen Lin
Published: December 2014

Considering the important role of the electrical equipments in the power grid, electrical equipment seismic fortification level should be further improved. Through comparison of electrical equipment related seismic codes in China and abroad,it is recommended that the seismic fortification level of electrical equipment is taken as strong shock, whose exceeding probability is 2% in 50 years.Combined with the results of typical groundby seismic hazardanalysis in different fortification intensity zones, the peak acceleration values corresponding to suggest seismic fortification level was proposed, that is 2 times of the value of medium shock.
Study on Slope Stability Evaluation Methods under Seismic Load
Authors: Men Ni , Sun You Wei
Published: December 2014

Slope dynamic factor of safety (FOS) under earthquake was calculated based on time history analysis method and compared with acceleration time history to analyze correspondence between them. In view of the fact that earthquake is a dynamic process, this paper proposed that three respects can be considered to analyze the slope stability rather than adopting a single FOS value. Firstly, the variation trend of the FOS time history can be combined with the forces on key points to analyze slope stability. Secondly, the displacement and stress vector fields can be adopted to evaluate the final slope stability. Thirdly, the variation trend of the displacement and velocity time history can be used as well. The above methods are applied to Beihoushan landslide in Hanyuan in Wenchuan earthquake to evaluate slope stability under earthquake and the analysis shows that the slope is stable as a whole.
The Simplified Model and the Critical Angle of the Curved Bridges with Multi-Dimensional Earthquake Excitation
Authors: Li Xi Mei , Du Yong Feng
Published: December 2014

The existing methods of curve beam bridge is the finite element method, the modeling and analysis of complex, heavy workload, not suitable for the proposed design method of regularity. According to the character of curved bridge, the bridge superstructure and piers is simplified as packing quality model that have two levels of degrees of freedom and a surrounding mass center shaft torsion degree of freedom, then the analysis model of double mass simplified 6 degrees of freedom is established, studying the dynamic characteristics and the structure vibration behavior through the dynamics equation of curved bridges. Example show that,the results of double mass model with the traditional of finite element model is consistent, double mass model has simple calculation method and can consider the influence of sensitive factors, with the help of programming is more suitable for the proposed design method of regularity. At last, Application MATLAB programming discussed the critical angle of the curved bridges under multi-dimensional earthquake based on double mass model, after change the curve bridge related parameters only one operation can achieve the most disadvantaged angle.
The Research of Forward Modeling about Seismic Attributes in Rich Oil Reservoir Segment of Enping Sag
Authors: Ma Qi Qi , Wang Yan Chun
Published: December 2014

Enping sag is located in the west of Zhu 1 sag of Pearl River Mouth Basin. In order to verify the reservoir spreading of Enping sag in Pearl River Mouth Basin and provide the reliable basis for reserves prediction. In this paper, according to the actual seismic data extracting the theoretical seismic model, applying spectral method to construct the acoustic wave equation, and then, deducing the partial differential equation resolution of absorbing boundary condition. Through the forward modeling summarized the seismic response characteristics of oil layer, and making a forward modeling with actual parameters of wells model. Finally obtained the expected effect.
Application of Waste Dumping Technology in Foundation Construction at Home and Abroad
Authors: Zhang Jin Miao , Xia Yong Jun , Mei Wen Ming
Published: December 2014

This thesis analyzed the technical characteristics and equipment selection of several methods in realizing the mechanization of waste dumping of deep well foundation, and proposed the development direction of waste dumping machines in our country.
Relationship between Modern Architecture and Interior Space
Authors: Wang Peng
Published: December 2014

Virtual reality technology applications can be at any time and at any stage of the design "into" building, to observe and experience their own design work by roaming, immersive experience of space, scale, materials, textures, etc., in real time to modify and improve the design elements, implementation and optimization of this paper focuses on the modern architecture of virtual reality modeling technology research, in order to optimize the geometry modeling techniques, texture optimization modeling techniques, integrated use of optimization modeling technology to achieve modern architectural applications and tried to reveal the specific relationship building structure and interior space.
Evaluation Model to Exterior Wall Assemblies
Authors: Hu Xiang Lei , Li Sheng Cai , Yan Hong Liang , Meng Gang
Published: December 2014

The Analytic Hierarchy Process (AHP) method presented in this paper is used to analyze three representative exterior wall assemblies from the perspective of manufacturers, designers, and consumers. Considering technical, economic, social, and environmental factors, a model and subsequent indicators were developed for qualitative and quantitative analyses. The approach discussed in this paper originated as a response to recent building code changes in China, and the need for value-engineers to better understand a set of newly developed wall construction assemblies in a way that minimizes subjective errors in the value-engineering evaluation process.
Research of Calculation Method for Final Soft Clay Ground Settlement by Preloading Method
Authors: Wang Da Gang , Xie Zhong Qiu , Liu Xi , Cao Jun
Published: December 2014

Preloading method is a common way to dispose large-scale soft soil foundation, and its methods of calculating the settlement amount mainly include exponential curve method, hyperbolic method, and Asaoka method. This paper chose exponential curve method and hyperbolic method to conduct ultimate settlement calculation on some reclamation project of Yingkou Port against measured data of settlement in the project, and compared the result to that calculated by splitting summation method. The accuracy was also verified by measured data of settlement amount in later phase to reach the conclusion that hyperbolic method is more suitable for calculating the ultimate settlement amount considering the soft soil foundation of marine facies in Liaoning.
Comparative Analysis on Built Environment between Ground and Underground Shopping Malls in Chongqing in P.R. China
Authors: Li Wen Jie , Liao Xin Xue , Meng Zhe , Miao Gao Yang
Published: December 2014

An investigation study on built environment was carried out for ground shopping malls and underground shopping malls, in search of similarities and differences between them. Four representative shopping malls were investigated from 2012 to 2014 by means of testing and questionnaires. It analyzed the current situation of indoor thermal environment, light environment, acoustic environment as well as indoor air quality. The study found that no significant differences in indoor environmental parameters (including air temperature, relative humidity and air velocity) and people’s sensation vote to them, apart from draft sensation vote for the two types of shopping malls. Besides, both the average indoor illumination was far below the national standard especially for underground shopping malls. Moreover, Noise levels were basically the same and the satisfaction rate of acoustic environment of underground shopping malls was apparently inferior to that of ground shopping malls. Eventually, indoor air quality was not as undesirable as it was expected even measured in the two types. On the basis of studying, some practicable improvement measures were proposed.
Study on Tree Planting Technology on Large-Scale Roof Gardens – Case Study of Nanhaifanyin Square
Authors: Fang Xiao Shan , Deng Wan , Liu Ming Xin
Published: December 2014

As a trend all over the world, the large building roof has been studied for a long time in many countries excluding China. Therefore, the paper attempts to provide practical technological guidance for tree planting on roofs in China by studying the case of Nanhaifanyin Square (with an area of 3.4 hectares) in Foshan , Guangdong Province. The tree planting on the roof of large-scale roof gardens is studied and discussed in this paper and relevant technological strategies are put forward in the last section. The paper will also illustrate the problems occurred in the process and relevant solutions will be summarized accordingly in view of the project of Nanhaifanyin Square. This case applying advanced roof greening techniques and fully embodies the planting process, as well as post-planting maintenance and management of trees. And most importantly, it provides reference techniques and methods for tree planting on large-scale roof gardens in terms of matrix, methods, planting procedure, maintenance and management.
Carbonation Life Prediction of Concrete Railway Bridges
Authors: Mei Ting Yu , Wang Jian Wei , Wu Lang
Published: December 2014

On the analysis of main factors influencing on carbonation of concrete is a stochastic model and criterion of carbonation life prediction of bridge protection layer of concrete carbonation depth. Detection results with long age of railway bridges, the minimum requirements for concrete bridge in northern area of the design strength and thickness of protection layer.
Investigation of Glass-Ceramics Based on Steel Slag under Various Sintering Atmospheres
Authors: Zong Yan Bing , Liu Zhao Bo , Hou Jun Jie , Li Hong Xu
Published: December 2014

Slag glass-ceramics were successfully prepared by cold pressing sintering method in different atmospheres from metallurgical solid wastes. The evolution of crystal microstructure and crystalline phase transition of slag glass-ceramics was investigated by thermo-gravimetric analysis (TG-DTA), X-ray diffraction (XRD) and field emission scanning electron microscopy (FESEM) coupled with Energy Dispersive X-ray spectrometer (EDX). The results indicate that the Na2O composition plays the role of decreasing the crystallization temperature to some extent. Iron oxides make the glass frits have a high driving force to crystallize. This oxidation of ferrum will postpone the process of densification and deteriorate the mechanical properties of product. On the other hand, the slag glass-ceramic products can obtain novel mechanical performance when the samples were sintered under nitrogen atmosphere.
Study on the Influence of Fiber Type on Mechanical Properties of Synchronization Plus Fiber Stone Layer
Authors: Chen Ming , Li Yu Hong , Chen Jing , Zhao Xin Hui
Published: December 2014

Based on pullout test, shear test, tensile test strip, studied the influence of three fibers and glass fibers of different lengths on mechanical properties of synchronization plus fiber stone layer. Test results show that, glass fiber and polyacrylonitrile fiber has little effect on the interfacial bonding performance difference compared with no fiber, polyester fiber has greater impact on the interfacial bonding performance; Adding fiber, crack resistance significantly enhanced, including glass fiber and polyacrylonitrile fiber are most obvious, considering, determined glass fiber as the best choice , 60mm as the optimum length.
Effect of MgO/Al2O3 Ratio on Properties and Crystallization of Glass-Ceramics
Authors: Hou Jun Jie , Zong Yan Bing , Liu Zhao Bo , Cang Da Qiang
Published: December 2014

Reduction electric furnace slag, quartz sand and soapstone were used as the raw materials for preparation of glass-ceramics according to their compositions and characteristics. Differential thermal analysis, X-ray diffraction, scanning electron microscopy were used to investigate the crystallization mechanism, microstructure and main mechanical properties of slag glass-ceramics with different mass ratios of MgO/Al2O3. The exothermic peaks of the DTA curves shift to higher temperature with the decrease of MgO/Al2O3 ratio. And along with the decreasing of the MgO/Al2O3, the crystallization of the glass-ceramics also decreased. The bending strength can reach 153.09MPa when the MgO/Al2O3 ratio is 3.03.
Experiment of Freezing-Thawing Cycles and Analysis of Damage Characteristics for Argillaceous Dolomite
Authors: Deng Jian Hua , Wang Xiao Chuan , Wu An Jie
Published: December 2014

For the purpose of research on behavior of argillaceous dolomite suffering from frequent cryogenic freezing weather in Guizhou region, the rock was processed into cylinder samples (diameter 50mm&height 100mm). Using BCD-218 cryogenic digital control equipment, in saturated state, the samples were frozen (-20°C) and thawed (20°C), each 12 hours for one cycle, total 30 times. Then, Longitudinal wave velocity (LWV), macroscale and mass varying with freezing-thawing cycles were respectively tested by RS-ST01C nonmetal supersonic test meter, vernier caliper (0.02mm), APT457A electronic balance (0.01g). Also, appearance characteristics were observed constantly. Lastly, the micro reason for changes in macro parameters of the rock was explained. The results show that the freezing-thawing deterioration form of argillaceous dolomite is spallation mode, and LWV decreases obviously with the increase of freezing-thawing cycles (FTC),maximum drop of 14.8%,while mass has a small increase, maximum change rate of 0.5%. Macroscopic properties are obviously affected by freezing and thawing cycles. Key words: argillaceous dolomite, freezing-thawing cycles, supersonic detection, damage characteristics
Character Analysis of Balance and Imbalance of Varying Rigidity of Rigid Pile Composite Foundation under Seismic Load
Authors: Wang Zhen Feng , Ma Ke Sheng
Published: December 2014

Based on ABAQUS finite element analysis software simulation, the finite element model for dynamic analysis of rigid pile composite foundation and superstructure interaction system is established, which selects the two kinds of models, by simulating the soil dynamic constitutive model, selecting appropriate artificial boundary.The influence of rigid pile composite foundation on balance and imbalance of varying rigidity is analyzed under seismic loads. The result shows that the maximum bending moment and the horizontal displacement of the long pile is much greater than that of the short pile under seismic loads, the long pile of bending moment is larger in the position of stiffness change. By constrast, under the same economic condition, the aseismic performance of of rigid pile composite foundation on balance of varying rigidity is better than that of rigid pile composite foundation on imbalance of varying rigidity.
Influence of Dehydrating Solution Types on Technological Properties of Alpha-Hemihydrate
Authors: Fridrichová Marcela , Dvořák Karel , Hájková Iveta
Published: December 2014

Sulphur binders originate by burnout of calcium sulphate dihydrate at different temperatures. All types are classified in air mortars therefore they can solidify, harden and remain stable only on air.
Recent Development of Nano Titanium Dioxide to Be Used in the Field of Building Materials
Authors: Zhan Yu Hao , Yu Xiao Hua
Published: December 2014

In recent years, the photocatalytic properties of nano TiO2 (nanotitanium dioxide) is one of today’s hottest issues of environmentally friendly materials, medical materials and building materials fields. In this paper, we present the latest research on nanotitanium dioxide to be used in the field of building materials. Based on the history of the photocatalytic properties of nanotitanium dioxide, the application of nanotitanium dioxide in photocatalytic concrete, photocatalytic ceramics, functional coatings and materials in the field of self-cleaning glass has been analyzed. Finally, further research will focus on nanotitanium dioxide used in the field of building materials.
Study on the Mix Proportion Design of C30 Supersulphated Phosphogysum-Slag Cement (SSC) Concrete
Authors: Ding Sha , Zhang Guo Zhi , Chen Fei Xiang
Published: December 2014

supersulphated phosphogysum-slag cement (SSC) is a newly developed non-burned cementitious material. It’s mixed and ground with 40%-50% phosphogypsum, 40%-50% ground granulated blast-furnace slag (GGBFS), 2% steel slag and 4% portland cement clinker. But the component of SSC differs greatly from that of Portland cement, there is few application researches about the SSC. In order to realize resourceful utilization of phosphogypsum, the mix proportion design method of SSC are studied. The mix proportion design method for C30 are systematically studied and a design optimization was carried out. According to the design regulations of mix proportion of ordinary concrete and the characteristics of SSC, the C30 high flowing concrete is prepared, and the optimum water-cement ratio is obtained based on revised Bowromi formula. According to the mix proportion optimization design, the 28d strength of SSC is up to 38.5MPa.
Influence the Carbonation Resistance and Mechanical Properties of Shotcrete by Accelerated Carbonation Test
Authors: Wang Jia Bin , Niu Di Tao , Ma Rui , Mi Ze Long
Published: December 2014

In order to investigate the carbonation resistance of shotcrete and the mechanical properties after carbonation, the accelerated carbonation test was carried out. The results indicate that the carbonation resistance of shotcrete is superior to that of normal concrete. With the increasing of carbonation depth, compressive strength and splitting tensile strength of shotcrete grew rapidly. The admixing of steel fiber can further improve the carbonation resistance, reduce the carbonation rate, and increase the splitting tensile strength of shotcrete greatly. Besides, based on analyzing the effects of construction technology and steel fiber of concrete for the carbonation resistance, a carbonation depth model for shotcrete was established. Key words: shotcrete; carbonation; steel fiber; mechanical properties
Design of Key Process Parameters Test-Bench for 1250mm2 Large Cross-Section Conductor Tension Stringing
Authors: Xia Yong Jun , Mei Wen Ming , Hu Chun Hua , Zhang Jin Miao
Published: December 2014

This document proposed the test scheme of limit Test-bench structural system under the setting-out conditions of simulating critical state and completed the design and manufacture of the test system through conducting investigation on test methods and equipment of tension stringing construction process, combining the 1,250mm2 large cross-section conductor and construction technology requirements and based on functional positioning, optimization of combined design and force analysis of Test-bench, mechanics analysis of various parts and their connection as well as allowable stress method check. This system was closer to the actual stringing working conditions, and the obtained data were more reasonable and exact and meet the actual engineering demand. In addition, the reliability of this test system has been verified through the test of 1,250mm2 third-class large cross-section conductor.
Research on the Mechanical Response of a Bolt Connection by Experimental and Numerical Method
Authors: Guo Li Lun , Chen Zhong Fu , Luo Jing Run
Published: December 2014

For a mouth shaped strucure with bolt connection, the mechanical response and thread stress distribution were studied by experimental and numerical method. The structure was tested with variety of the pretension loads from 10 N.m to 70 N.m . In this paper, a numerical method modeling the helical thread was proposed. In the method, the structure was divided into three regions, thread region, conventional region and transition region. The conventional region was modeled with the conventional method, however, the thread region and the transition region were modeled using the Glide-Guide method. Firstly, two helical lines and the plane elements were created. Secondly, the plane elements were rotated along the lines, then the three dimensional elements for the helical model were obtained. Finally, the nodes of the transition region elements and the conventional region elements were merged so that the whole model was attained. The experimental structure was modeled by the method, and the mechanical response and thread stress distribution were obtained. The results show that the axial stress of the screw obtained by experiment and the numerical method were very close, and they were both close to the empirical formula when the equivalent friction coefficient was 0.22 . Comparing to the existing methods, the numerical method proposed in the article is mush simpler, and it can obtain reasonable results using all standard elements.
Finite Element Analysis of Concrete-Filled Rectangular Steel Tubular Y-Connections under Tension
Authors: Cheng Gao , Liu Yong Jian , Tang Peng
Published: December 2014

Rectangular steel truss Y-connections, whose chord is filled in concrete, is described. The behavior of Y-connections include hollow structural section and concrete-filled section loaded in tension is analyzed by means of finite element analysis. It is shown that there is a significant improvement in strength and stiffness of Y-connections with concrete-filled chord.
Stability Analysis of Elastic Plate in Axial Subsonic Flow
Authors: Dong Yu , Yang Yi Ren , Lu Li
Published: December 2014

The stability and dynamics of the two-dimensional elastic plate with simply supported boundary conditions in uniform axial subsonic flow were studied. The governing equations of coupled elastic plate in axial flow were derived based on the potential theory. The finite difference method was employed to discrete the governing equation and the flow potential function. The governing equation can be expressed as the function of structural transverse vibration displacement by the matrix operations. The eigenvalue method was used to analyze the stability of the elastic plate, the results of which show that the models with simply supported boundary conditions undergo divergent instability when flow velocity reaches the critical value, the critical divergence velocity is in close agreement with theoretical result using other analytical approaches.
The Displacement Distribution of Plane Beam with Simply Supported under the Force Couple with Load and Thermal
Authors: Yang You Zhen , Wang Hu , Ma Han Lin
Published: December 2014

Based on many of researches about bend of beam under uniform load in the Hamiltonian system, but few on bend of beam under the force couple with load and the thermal, according to the validity of Hamiltonian method in symplectic space, in this paper, the method is used to solve bending of plane beam under the force couple with load and the thermal, and give out the distribution of displacement under this condition. Numerical simulations show the effect of temperature has great influence on the distribution of displacement of the beam. The results provide a numerical model and reliable reference data for the follow-up study of its analytical solution.
Numerical Simulation of Axial-Flow Fan with Adjustable Vanes in the Pant
Authors: Li Yuan  Yuan , Zhao Zhen Ning , Wen Zhi Qiang
Published: December 2014

Based on the axial-flow fan with adjustable vanes in a power plant of Tangshan, the internal flow with different inlet speeds during the axial-flow fan run were simulated with FLUENT software package. The results showed that if inlet velocity was greater than the critical velocity, the flow was relatively uniform. If inlet velocity was lower than the critical velocity, a vortex caused by tip leakage would decrease fan efficiency and induce surge.The impact increased gradually with increasing of the moving blade angle. The results were consistent with the actual and provided further evidence for high efficient and safe operation of axial-flow fans.
A Study on the Design Characteristics and Methods of Application of an Environment-Friendly Daylight Control System
Authors: Seo Won Duck , Lee Kang Guk
Published: December 2014

This study was conducted to understand the design characteristics and configuration techniques applicable to actual architecture design by a daylight control system and identifying the planning elements. First, theories about buildings that use a daylight control system were. Second, the basic characteristics and planning elements of buildings that use a daylight control, Third, the actual application methods were divided into those for roofs and façades, and the design configuration techniques.
Research on Process Control Theory and Strategy of Green Building Design
Authors: Wei Xiao
Published: December 2014

This paper puts forward the concept by green building design on account of "process control" principle which based on the disjoint between architectural design and green building design consultation, as well as the theoretical research focuses on post-assessment way instead of no development in design that currently existed in the green building of our country. By elaboration to the concept of “process control”, it analyzed the key point of the overall process control in green building design. Meanwhile, it raised the solution plans and process control strategies in green building design from the aspects of planning site selection & layout, combination to plane designs & form, facade design & material selection, equipment system selection, material & energy and operation management measures.
Research on Energy-Saving Design of Building Exterior Pattern for Cold Regions
Authors: Hui Chen
Published: December 2014

According to the regional characteristics and climatic features in a cold region, interpret the relationship between building exterior pattern and energy-saving design by do the research on building size, building skin and construction design method,and explore how to combination of both, explore the possibility of the development of energy-saving building forms in a cold region on this basis, and enrich its architectural form vocabulary.
Application of Total Station Instrument in the Installation and Measurement of High-Precision Steel Structure
Authors: Gui Fang Ru
Published: December 2014

The analysis of the difficulties of structure measurement of a stadium and the application of total station instrument spatial measurement technology specifically solve the control and measurement of the steel structure installation, location survey of the pre component installation, and the technical problems in the process of calibration measurement, which has ensured that the accuracy of the entire steel structure construction.
Bootstrapping Added Partial Search Strategy for GNSS Integer Ambiguity Resolution
Authors: Wu Ze Min , Bian Shao Feng , Jiang Dong Fang , Xiang Cai Bing
Published: December 2014

Integer least square estimator is known to be optimal in GNSS ambiguity resolution. But it relays on a search in the whole ambiguity space which decreases the computational efficiency. A partial search strategy is proposed in this contribution. The new search is limited in an ambiguity space subset defined by the bootstrapping solution; the search-and-shrink approach is also introduced. Two experiments have shown the new search strategy promotes the computational efficiency a lot without a notable fixing property lost.
Comparisons and Direct Transformation Formulae between Azimuthal Conformal and Gnomonic Projections
Authors: Liu Qiang , Bian Shao Feng , Li Zhong Mei
Published: December 2014

Definitions of azimuthal conformal and gnomonic projections were introduced, and contrastive analyses of graticules shapes between these two projections were conducted. Based on theories of perspective azimuthal projection and space geometrical relationships, transformation between azimuthal conformal and gnomonic projections was carried out through series of derivation. Direct transformation formulae between coordinates of the two projections were established with respect to standard parallel. Finally, correctness and reliability of these formulae were tested and verified by numerical examples. The formulae could be widely used and enrich theories of projection transformation to a certain degree, which would offer reference value for charting in polar regions.
Introduction to the Rail Line Laying Base Standard Setting
Authors: Gui Fang Ru
Published: December 2014

The underground railroad in line with the track, hole construction after the rail top elevation is not easy to adjust, so the construction of the rail top accuracy requirement is very high, therefore in the track before the construction of setting track-laying base.
The Research of Temporal Application Problems in Cadastral Information System
Authors: Liu Mao Hua , Han Mao , Wang Ji Jin
Published: December 2014

According to the time characteristic of the space data in Cadastral Management Information System of cadastral data description, implementation, operation, storage, query, analysis and display. On a regional map as the base map, virtual land registration data as the experimental data. Experiment system to a ground of temporal information query, parcel information recorded, and related functions such as database shows, and complete the cases of dynamic management of the region. Combined with dynamic time attribute, to show different time of spatial location and the change of attribute information. Through the establishment and improvement of experimental system, to display temporal information in the cadastral database highlighted,enrich the content of the cadastral data. It Is advantageous to the space-time evolution simulation of cadastral data, and provide technical support for the management and decision-making
Evaluation on Safety of In-Service Structures Concerning Earthquake Resistance Based on Fourth-Order Moment of Limit State Function
Authors: Wang Yu Ying , Sun Ya Zhou , Feng Le Yang
Published: December 2014

During the process of being used, engineering structures will undergo material aging and structural damage with time passing by under the combined influence of internal factors including load, environment and structural material[1], and accumulation of such damages will cause decrease of bearing capacity, durability and reliability. Among various factors influencing the reliability of in-service structures, ultimate bearing capacity plays the decisive role in safety. In this paper, the fourth-order moment of limit state function is inferred through calculation of failure probability of in-service structures, and thus safety and durability of in-service structures can be ensured.
The Influence of Cross Section Geometric Shape on the Slope Stability
Authors: Zhang Bao Long , Fan Wen
Published: December 2014

The stability of the soil slop is influenced by many factors. In this paper, the influence of cross section geometric shape on the slope stability is analyzed by establishing a reasonable calculation model and using finite element strength reduction method. Results indicate that the slope stability of stepped excavation surface is higher than that of linear excavation surface, and the stability is better with larger and more platforms, the designers should make a choice in design by comparing cost and ease of construction. Slope table form also has affections, the stability of concave linear and convex slope type decreases in turn.