bluuebunny/crossref_metadata_2025 huggingface dataset:
GA-Optimization on Weiling Space of Steel Sheet Piles Construction
Authors: Zheng Rui Jie , Fu Su , Guo Jin
Published: October 2012

The advantages and disadvantages of two construction methods of steel sheet piles cofferdam are introduced and analyzed in the presented work, the analysis result of three representative models indicate that support setting plays an important role and has a strong influence on the internal force of steel sheet piles. Using genetic algorithm (GA) and matlab finite element and user-defined objective functions, two optimization models are proposed for traditional and inverse construction method. The work of this paper demonstrates that using reasonable support space can effective reduce the maximum bending moment of the steel sheet piles, it means that steel sheet piles can break current water depth limitation and application in deep-sea construction.
ICA Spatiotemporal Filtering Method and Its Application in GPS Deformation Monitoring
Authors: Huang Da Wei , Dai Wu Jiao , Luo Fei Xue
Published: October 2012

Principal component analysis (PCA) is a good method to be used in spatiotemporal filtering for regional GPS network. As an extension of PCA, independent component analysis(ICA) is also widely concerded in many fields of sciences and application researches. As a new spatiotemporal filtering method, the application of ICA in spatiotemporal filtering of the regional GPS network and GPS deformation monitoring is explored in this paper. The simulated data test shows the filtering effect of ICA is the same as PCA, both of the PCA and ICA can extract two independent components which implied in simulated common mode error. At the same time, the SCIGN data test shows the filtering effect of ICA is a litter worse than PCA, but ICA extracts not only one independent components as common mode error, it is not unique and independence that can not be provided by the PCA method. It also reflects the essence of common mode error of different station in independence. Therefore, ICA method can be applied to GPS deformation monitoring as a new spatiotemporal filtering method, the feasibility and advantage of ICA is demonstrated in the experiment of simulated data and SCIGN data.
Study on the Method of the Damage Identification for Frame Structure
Authors: Yang You Fa , Li Shuai , Ling Ling
Published: October 2012

First order iterative algorithm, mixed iterative algorithm, structural damage identification using static and dynamic data were put forward. The first and second order sensitivity matrixes of modal parameters that respect to the damage member were derived, and the modal truncation error which produced during the derivation of modal mode sensitivity was improved. The first and second order sensitivity equations were established respectively based on the principle of Taylor series expansion. And the solving method of these sensitivity equations was studied. Mixed iterative algorithm took up the second order nonlinear analytical solution as the first substituting value, and then the first substituting value was modified based on the Taylor series bias error using the solution of the first order sensitivity equation. It showed that the mixed iterative algorithm in this paper had a better convergence and a faster iteration speed because the higher precision second order nonlinear analytical solution was adopted. Because the method using static and dynamic data combined the static information and dynamic information of the structure, it could react the inside information of the structure more comprehensively, the result of damage identification was more accurate and it would be adapted more widely.
Stady on the 3G Wireless Network Tunnel Safety Monitoring System
Authors: Song Jin Bo
Published: October 2012

This paper mainly discusses one kind based on the 3G network technology cluster type tunnel safety monitoring system. Tunnel safety monitoring center of the system can be displayed at the same time, analysis of bridge and tunnel safety monitoring status, is convenient for decision makers to different budgets, optimize the overall regional tunnel cluster maintenance; through the cluster type tunnel safety monitoring, can be realized on the spread over a larger area of bridge and tunnel security state data of horizontal comparison, unified management, completely changed the previous single tunnel safety monitoring system to realize the information sharing between the" information island" situation, more convenient to the regional environment, similar or different environment, different structure tunnel similar structure tunnel safety status of the longitudinal, transverse analysis comparison and research, which is beneficial to promote the optimization of tunnel structure design and implementation of a number of tunnels, the maintenance and reinforcement.
The Inspection Method Research on Air Voids of Externally Bonded FRP for Strengthening Concrete Structures
Authors: Xu Hai Bin , Deng Zong Cai
Published: October 2012

Externally bonded FRP for strengthening concrete structures is widely used in concrete structures strengthening field. Many factors affect the strengthening quality, in which delaminations and air voids are two especially important factors. At present the most popular method of inspecting delaminations and air voids is hammer sounding, but this method is slow, the inspection result is easily influenced by the inspector’s experience, and the defect area can’t be measured accurately. In this paper infrared thermal imager is used, according to the inspection results with infrared thermal imager in different conditions, the influence factors to the inspection effect including surface infrared radiation rate, wind, heat source type, heating time and the test environment are analyzed. The research shows that under right conditions using infrared thermal imager to inspecting the delaminations and air voids is a convenient, quick and accurate method.
Deformation Monitoring and Environmental Protection for Deep Foundation Pit Engineering
Authors: Qian Tong Hui , Wu Hao , Zhao Gao Wen , Fu Bi Hao
Published: October 2012

For researching the influence of excavation constructing to the environment, we took many measures to monitor the deformation of retaining structure, underground pipelines, groundwater-bit and surface cracks, according to the actual situation of the engineering. Obtained the deformation discipline and force characteristics of the excavation, as well as the discipline of influence. From the results of monitoring, it showed that monitoring is the key to the informative construction of the excavation. Analysis the result of monitoring dynamically, can guide the construction, and adjustment the design. From the engineering, it might have large influence to the environment even the design was reasonable and the retaining system met the security conditions. So, a economic and fitting, security and reliable technology plan for protecting the buildings, roads and pipelines close to the excavation is necessary.
Stability Analysis of a Reinforced Soil Slope Based on the Strength Reduction Method
Authors: Wang Li , Wang Shi Mei
Published: October 2012

Apply large general-purpose finite element analysis software ABAQUS as a platform, The criterion of iteration non-convergence conventionally used for assessing the instability state of slopes,and an example is given to the following conclusions: The strength reduction method based on ABAQUS simulate anti-slide pile slope stability analysis that has a true reflection of the elastic-plastic deformation in geotechnical engineering,it can be widely used in elastic-plastic deformation problems in geotechnical engineering. The anti-slide pile can effectively improve the stability of slopes, setting up anti-slide pile egitimately in the soil plays an important role at the safety of slope stability.
Experimental Research on the Stability of Spatial Lattice Shell
Authors: Tang Gan , Li Wei Wei , Yin Lin Feng , Guo Xiao Ming
Published: October 2012

In the interest of an understanding to the imperfection stability behavior, a model of single layer spherical lattice shell was designed. The size and the pattern of initial imperfections were entirely measured. Automatic harmony loading control system and data acquisition system was used. The experiment plan, method and results have provided reference significance for the study on the stability of spatial lattice shell. The experimental results and the results of measured imperfections method were compared and analysed in detail. It is verified that measured imperfections method can accurately take into account of the effect of initial imperfections and it can be used for the supplementary checking computations of some important finished structures.
Study on Deformation and Stability of High Slope with Weak Intercalated Layers
Authors: Jiang Long , Sun Jian Hui , Wang Wan Shun
Published: October 2012

The paper analyzed external deformation, deep deformation and stability of slope with weak intercalated layers in detail through field monitoring of Mayanpo slope at Xiangjiaba Hydropower Station. The results show that: ① Displacement deformation increases with time and decreases with increasing depth, and displacement rate decreases with time. ② Dislocation position exists in weak intercalated layers. Dislocation rate first increases and then decreases until basically stable, and local fluctuations are mainly affected by rainfall and dynamic equilibrium adjustment of the slope internal deformation. ③ Through stability analysis of Mayanpo slope by strength reduction FEM, stability coefficient is 1.72.
Pitting Corrosion Propagation Analysis of Reinforcement in RC Bridge Beams Considering Uncertain Information
Authors: Ma Ya Fei , Zhang Jian Ren , Wang Lei
Published: October 2012

The prediction of pitting corrosion-induced structural performance degradation is limited by the inspection means and experimental data. Incomplete information and tempral and spatial uncertainties of corrosion are integrated to develop the time-dependent pit depth model. The reinforcement corrosion is divided into two stages in this model. The approach is illustrated by a removed concrete bridge. The evolutionary characteristic of probability density function of the pit depth is analyzed, and the probabilistic distribution pattern and distribution parameters are also obtained. Besides, The sensitivity of input parameters on the pitting model are also discussed. The results show that under appropriate conditions of concrete strength (>25MPa), increase the same percentage of concrete strength is more sensitive to the pit depth than improvement the same percentage of concrete cover thickness. The effects of continuous improvement of concrete strength or increase the thickness on corrosion depth gradually decreases. The proposed procedure can be used to evaluation of existing reinforced concrete bridge.
An Economic Analysis on Regeneration Concrete Hollow Block
Authors: Gu Song , Wang Chao , Li Lu , Gan Yu Ping , Lin Kai
Published: October 2012

With the development of wall innovation, the appearance of regeneration concrete hollow block has an important operation significance for building energy saving and high efficiency recycling of waste concrete. The paper introduces a new green wall material—regeneration concrete hollow block and analyzes the feasibility of its application from the point of macroscopic and technical economy. The paper forecasts the direct and indirect economic benefits after its application in order to promote the extension of regeneration concrete hollow block.
Influence of Geometry Parameters on Durability of Concrete Structures Exposed to Chloride Environment
Authors: Zhou Xin Gang , Xia Hui
Published: October 2012

Finite difference method (FDM) is used to numerical stimulation analysis for chloride diffusion in concrete. By numerical computing, comparison of chloride content profile in different concrete members with different sectional shapes is made. Calculation and comparison show the chloride content prolife in rectangular and circular section has obvious difference. If the side length of rectangular section is equal to the diameter of circular section, as well as the material property and environment, the chloride content in rectangular section is higher than that in that in circular section. In the calculation example, the chloride content at the depth of reinforcement of circular section is about 50-60% that of rectangular section. This tendency is more remarkable in less section dimension, as well as less cover thickness. With the increasing of section, the ratio of difference becomes to be less until to a constant value. In durability design and service life prediction of concrete structures, the section shape and dimension influence should be taken to consideration.
The Settlement Prediction of Pile Foundation Based on Grey Linear Regression Model
Authors: Liu Jia Kun , Wang Jian Ping , Zhu Min , Hou Xiao Jie
Published: October 2012

Grey linear regression model is a covert grey combined model that is built based on GM(1,1) model and linear regression model. It improves undervaluation of linear regression model which can not in press the exponential growth and come to deficiency of grey GM (1, 1) model which has not linear factor. This paper briefly introduces the establishment and precision examination method of the grey linearity regression model and establishes the grey linear regression model to predict the relationship of load and settlement. Based on the data of static load test, the load-settlement curve is simulated and analyzed. The result of study shows that Grey Linear regression Model can effectively predict the settlement of pile foundation, and be of the theoretical and actual meaning for further analyzing the bearing capability of pile foundation.
Simulation of Improper Construction Procedure and Crack Analysis
Authors: Huang Wen Xiong , Tan Li Ying
Published: October 2012

Based on the real construction technology, process and environment of Yuquanxi Bridge, the finite element method was applied in the research to make sure the crack mechanism and find out the impact of improper construction procedure on cracks of Block No.0. By comparing the numerical results with actual cracks condition, the impact of improper construction procedure on cracks of Block No.0 is uncovered clearly and it proves that to master of correct construction procedures and methodology is of great importance in construction a bridge.
The Impact of Cracks on Different Age of Concrete Small-Sized Hollow Block Masonry
Authors: Wang Yin , Shi Zhi Jian , Hu Ya Di
Published: October 2012

In the latter part of concrete small-sized hollow block masonry cracks after using many reasons, including the design factors that are not in place, the material factors, construction factors, climate, natural conditions, factors, etc., in which the age of c concrete small-sized hollow block length of cracks in the masonry of the impact is different. Cracks in the masonry structure will cause adverse effects, affecting the use of construction and durability, this paper field test, to identify non-instars of concrete small-sized hollow block masonry cracks on impact. To reduce or prevent age of concrete hollow block the effects of crack, to strictly control the construction of block wall on the age, age as long as possible, especially in areas influenced by temperature, such as wall, the top wall, should pay attention to blocks of age, in a possible, concrete hollow block age should be greater than 42 days, the best age to block more than 56 days is better.
Experimental Research of Low Shear Wall with SMA Bars Concealed Bracings
Authors: Ren Wen Jie , He Peng Fei , Jia Ru
Published: October 2012

Many researchers study the seismic performance of shear wall embedded with reinforced concealed bracings, but not take the shape memory alloy bars concealed bracings into account. Quasi-static tests of a low shear wall with reinforced concealed bracings and a low shear wall with SMA bars concealed bracings are performed to study the seismic performance of the shear walls. Bearing capacity, stiffness, ductility, hysteretic energy and residual deformation of two specimens are researched and analyzed. The experimental results indicate that the SMA bars concealed bracings can increase the strength and ductility of the low shear wall considerably.
The Vertical and Horizontal Spectra of Near-Fault Ground Motions
Authors: Yin Jiang , Zhou Xian Yan , He Guo Jing
Published: October 2012

Based on the horizontal and vertical components of a set of 30 acceleration records obtained from 10 near-fault earthquakes, the horizontal and the vertical response spectra are established, and have been compared with each other in this study. Statistical analyses show that, for the selected 30 acceleration records, the maximum mean of vertical acceleration spectra is slightly higher than which of horizontal acceleration spectra. That means the near-fault earthquake really have significant vertical effect. Consulting the domestic and international research achievement, the normalized near-fault design spectrum adapted to Chinese seismic design Code (GB50011-2010) is established in horizontal direction. The results show that, within short period range, the horizontal near-fault design spectrum obtained in this paper is obviously higher than which derived from Chinese seismic code. Subsequently, the spectra of horizontal components for the selected 30 records are each scaled to match the horizontal near-fault design spectrum at two periodic points of 1.0 and 1.5 sec respectively, and the corresponding vertical spectra are scaled with the horizontal spectra at the same time. The scaled results reveal that the vertical spectra have much higher discretion than horizontal spectra, hence the study in this paper could initiates the research interest to a new aspect concerned with the randomness of vertical spectra for near-fault ground motions, which would affect the seismic reliability of structures significantly.
Study on Statistical Analysis in the Characteristics of Frequency Changes of Typhoon Landed in China
Authors: Wang Yi Xin , Yuan Xi Min , Yang Min
Published: October 2012

China is one of the countries suffered the most serious typhoon disasters in the world. Typhoons have occurred frequently, which resulted in the loss and impact, and caused widespread concern and attention of the international community. Therefore, it is urgent to analyze the main features of typhoon and the evolution of typhoon disaster of China. By analyzing the typhoon landed frequency changes of China since the 20th century, theoretical support would be provided and more targeted defense work of typhoon would be done which could put forward countermeasures and suggestions of typhoon defense work in China.
Experimental Study of Post-Fire Behavior of Steel Fiber Reinforced Ceramsite Concrete Filled Steel Tubes
Authors: Zhang Jin Yi , Wang Xin Tang , Sun Ping Xin , Sun Hong Liang
Published: October 2012

The axial compressive mechanical behavior of steel fiber reinforced ceramsite concrete filled steel tubes (noted as SFR-CCST) after exposure to fire are experimentally studied. Effect of furnace temperature, dosage of steel fiber in specimens on the post-fire mechanical performance of the specimens after exposure to fire was especially discussed. The results show that all the specimens of SFR-CCST have higher post-fire bearing capacity and better plastic deformation, and there was no obvious descending segment in the load-strain curves of the most specimens after exposure to fire. It was concluded that the furnace temperature applied to the specimens and dosage of steel fiber in the specimens of SFR-CCST has some effect on the post-fire mechanical performance of the ceramsite concrete-filled steel tubes after exposure to fire, and the dosage of steel fiber of 0.5% has the most effect on the post-fire performance of lightweight aggregate concrete filled steel tubes after exposure to fire.
Research on Simulation Model of Nonstationary Stochastic Processes in Natural Disasters
Authors: Hu Can Yang , Chen Qing Jun , Xu Qing Yang
Published: October 2012

Simulation of nonstationary processes has become an indispensable tool in study and prevention of natural disasters. A new method of simulation of nonstationary random processes is presented based on the orthogonal HHT spectra of sample observations and random phase. It takes advantage of orthogonal EMD, the instantaneous frequency, amplitude of the Hilbert transform and independent random phase angle, thus overcoming difficulties in the estimation of the frequency modulation and interdependence of frequency and amplitude modulation functions faced by most currently available methods. The new method extracts and preserves the true physical features of the process. The examples of earthquake ground motion and subway vibration, as low frequency and high frequency nonstationary process respectively, were simulated in the paper. The time history of sample, Fourier amplitude spectrum of sample, arithmetic average of sample, variance of sample, Wavelet time-frequency distribution of sample amd autocorrelation coefficient of sample compare well with those of the records. Scattering extent of the peaks of the sample processes is also analyzed in the paper. We can conclude that the method has great potential for engineering applications when dealing with nonstationary, nonlinear random peocesses exist in natural disasters, such as earthquake wave, vibration wave , wind wave and ocean wave.
The Calibration on Nonlinear Single Return Period Storm Intensity Model Parameters by the New Blending Accelerating Genetic Algorithm
Authors: Ren Bo Zhi , Lu Jing Cheng , Zhou Hong Tao
Published: October 2012

Through improving the real-coded genetic algorithms and embedding the algorithm of accelerating the local search in the Powell direction and the operation of accelerating cycle, thereby it is constructed the New blend Accelerating Genetic Algorithm (hereinafter referred to as NBAGA). The applied examples of the calibration on nonlinear single return period storm intensity model parameters show that this method takes into account of the advantages of both the advantages of the improved real-coded genetic algorithms and the Powell Algorithm, therefore this method is an excellent nonlinear optimization method which can search the global optimal exact solutions quickly and in greater probability, as well as doing subtle search locally.
Study on Incipient Motion of Consolidated Cohesive Fine Sediment
Authors: Wang Jun , Guo Wei , Xu Hai Tao , Jin Zhong Wu , Zhou Yin Jun
Published: October 2012

The incipient motion mechanism of cohesive fine sediment is different to the one of non-cohesive sediment. It is related to the consolidation while being influenced by the dry unit weight and particle size. By means of the rectangle piping flume, the influence mechanism of dry unit weight and particle size to critical shear stress of cohesive fine sediment is studied. Experimental results show that on the condition of consolidation, the influence of dry unit weight to incipient motion is divided into two different stages, one is that when dry unit weight increase quickly, but the influence to incipient motion is not greatly, another is that when dry unit weight increase slowly, but the influence to incipient motion is very greatly, the critical dry unit weight to two stages decline as mean particle size decrease. So the mean particle size is finer, the degree of dry unit weight influence to critical shear stress is stronger, and the incipient motion is more difficult when consolidation last longer; it is also shown consolidation is more disadvantageous to incipient motion.
The Analysis of the Industrialized Buildings in Heilongjiang Province
Authors: Sun Shi Jun , Shi Li Gang , Zhou Guang Chun
Published: October 2012

This paper analyzed the results and the status of China's building energy efficiency, explored the new areas of building energy in future: the building industrialization. Moreover, some types of building industrialization and their advantages such as energy-saving, environmental protection, waste usage, economy, and higher industrialization were introduced. As long as some problems and deficiencies are overcome, building industrialization would promote the building energy efficiency to achieve “Four saving and Environment protection” enormously in China.
Analyse the Benefit of Technical and Economic of Crowded Reamed Pile
Authors: Wang Zi Jing
Published: October 2012

Through the crowded reamed pile soil of adaptability, single pile bearing force, saving material and planted environmental protection performance analysis, explain crowded reamed pile has good technical and economic benefits.
Simulation of Wind Pressure for Self-Stayed Rod Based on CFD
Authors: Song Xiao , Xu Guang Sheng , Li Peng
Published: October 2012

Method of fluid dynamics numerical simulation and CFD related theory are discussed in the paper. The process of the solution and the influence factors of the numerical simulation are introduced relating with model of self-stayed rod. The wind pressure coefficient can be obtained from numerical wind-tunnel simulation of self-stayed rod in the turbulent flow wind. This research conducts the contrast of Load Code for the Design of Building Structures and results of numerical simulation.
Study on Hot-Pressing Process of Low-Cost Straw Particle Board
Authors: Ling Qi Fei , Li Xin Gong , Yan Yong Lin
Published: October 2012

The mixture of isocyanate and urea-formaldehyde adhesive resin was used to manufacture low-cost straw particle board by hot-pressing process. Influence of the hot-pressing temperature, hot-pressing time, board density and the amount of isocyanate adhesive on straw particle board mechanical properties were studied. The resulted showed that, within a certain range, the straw particle board physics performance was improved with the increase of hot-pressing temperature, hot-pressing time, board density and the amount of isocyanate adhesive. The proper hot-pressing process of cost-straw particleboard is hot-pressing time for 40s/mm, MDI applied amount of 3%,a density of 0.7 g/cm3, hot-pressing temperature of 180 °C
Experimental Research on the Influence of Steel Reinforcement on the Crack Resistance of Ready-Mixed Concrete
Authors: Yang Wei Jun , Yuan Shuai , Peng Yu Bo
Published: October 2012

The objective of this work is to find the way of diameter and ratio of steel reinforcement impacting upon crack resistance of ready-mixed concrete. By analyzing the bonding theory of steel and ready-mixed concrete, as well as making an experimental study of plate cracking performance, it comes to the best reinforcement ratio. The conclusions are based on physical reasoning and available experimental dates, which can provide the user with references.
Modeling of Vapor Pressure Build-Up in Heated High-Performance Concrete
Authors: Zhao Jie , Zheng Jian Jun , Peng Gai Fei
Published: October 2012

Under high temperature conditions, such as fire, high-performance concrete will undergo material degradation or even spalling. Spalling is the most detrimental to concrete structures. To prevent concrete from spalling, the mechanism should be understood. Since the build-up vapor pressure in concrete is supposed to play a dominant role in spalling, a vapor pressure prediction model is proposed in this paper to quantitatively analyze the vapor pressure, which can be used for the spalling mechanism study.
An Experimental Study on Mechanical Properties for Ternary High Performance Concrete with Fly-Ash, Blast Furnace Slag, Silica Fume
Authors: Kim Jeong Eun , Park Wan Shin , Cho Sung Ho , Kim Do Gyeum , Noh Jea Myoung
Published: October 2012

It is essential that concrete component is made up with aggregate, sand, cement and water. But recently, Public concern is increasing of a variety structure, resource recycle. Also, According to heat of hydration rising, Concrete is making a causative of concrete-crack. Concrete-crack causes a falling-off in quality of concrete. Therefore, high-performance concrete is evaluated by concrete mechanical properties (compressive strength, splitting tensile strength) with different admixture (fixing W/B 34%), fly ash, blast furnace slag, and silica fume replacement ratio (50%, 50%, and 25%).
Study on Expansion and Deformation Characteristics of Expansive Soil in Yunnan Province
Authors: Zhou Ying Xin , Tang Chuan , Zhang Ming , Yue Rui Qiang , Ma Yong , Yang Hong , Fang Shao Lin , Tang Zhong Lin , Jiang Wen Jiang , Li Dan Dan
Published: October 2012

Swelling tests of remolded expansive soil with water immersing are carried out by use of the simple consolidometers. The swelling characteristics of the expansive soil under the different initial conditions are studied. The Dose Response model is used to fit the rules of swelling time interval for expansive soil with water immersing. The quantitative relationship among the swelling and initial overburden pressure, initial water content and initial dry density is attained by use of the three dimensional regression analyses. The important index obtained could be provided to the engineering design, construction and stability evaluation of expansive soil slopes.
Five-Phase Sphere Model for Elastic Modulus of FRP-Confined Concrete
Authors: Liu Ming Hui , Wang Yuan Feng , Wu Han Liang
Published: October 2012

Based on the four-phase sphere model, a five-phase sphere model predicting the elastic modulus of FRP-confined concrete was built up, by considering the effect of FRP sheet. The model can describe the elastic modulus of the FRP, the stirrup ratio, the aggregate volume fraction, the aggregate size and the interfacial transition zone (ITZ), et al. on the development of the elastic modulus of FRP-confined concrete with age. By comparing with the experimental data, the five-phase sphere model evaluates the tests well
Effect of Mineral Admixtures on Chloride Binding Mechanism in Concrete
Authors: Zhu Qiao , Chen Yi , Jiang Lin Hua
Published: October 2012

The chloride binding mechanisms of different mineral admixtures under the condition of stray current and NaCl solute were researched. The electric potential titration was used to measure the content of total chloride ions and free chloride ions. The results show that using of mineral admixture could effectively inhibit the destructive action of the stray current to the stability of bound chloride ion in cement paste. Among all, the most effective mix proportion on chloride-induced corrosion is the mixture with only slag, then the double mixing of fly ash and slag, the last comes the mixture with only fly ash.
Stress Analysis of Local Compression on the Center of Plain Concrete Column
Authors: Wang Yan , Zhai Lian , Chen Li Mei
Published: October 2012

In this paper, studied on the local compression on the center of plain concrete square column, by using finite element analysis found its stress distribution is approximate to strut and tie models and established strut and tie models of concrete subjected to local compression.
Fatigue Properties of 316L Stainless Steel
Authors: Zhao Xiao
Published: October 2012

The present paper deals with experimental studies on the tension-tension fatigue properties of 316L stainless steel by using a servo-valve controlled electro-hydraulic testing machine at room temperature. The low cycle fatigue properties of 316L stainless steel were studied and the initiation mechanisms of fatigue cracks were investigated and analyzed with scanning electron microscopy (SEM). Preliminary results indicate that the S-N curve of 316L stainless steel descends linearly in the low cycle regime and fatigue failure initiates from inclusions/defects on the specimen surface.
Experimental Study on Mechanical Properties of Hybrid Fiber High-Strength Concrete
Authors: Liu Xi Liang , Liu Shao Feng , Qin Ben Dong , Yang Da Fang
Published: October 2012

Design 6 different dosages of C70 hybrid fiber high-strength concrete and a group of ordinary-strength concrete C70. By test of compressive strength and splitting tensile strength, discovery the high-strength hybrid fiber concrete compressive strength is not increasing trend; tensile strength increases significantly, average up to 5.12MPa, tension and compression ratio increased by 12%~40%; specimens eventually destroying the near ductility failure, in the case of 1.2% volume dosage of steel fiber and 0.10% volume dosage of polypropylene fiber, tension and compression ratio reach to 0.0683, hybrid fiber high-strength concrete showed good mixing effect, in the large-scale concrete construction has a certain spread value.
Fitting Analysis of Soil Strength Parameter Based on the Finite Element Method
Authors: Yang Bin , Wang Li Ying
Published: October 2012

Abstract: This paper takes the project of the navigation lock in Jialing River as an example to study the lock head structure design layout, and build up a three-dimensional finite element model and carry on the nonlinear numerical calculations by using large finite software ABAQUS, and calculating the structural internal force of the lock head by the 3D nonlinear finite element method. This paper utilizes the numerical analysis method to analyze soil strength parameters. Combining with the FEM calculation data, the data-fit between the influencing factors and the side piers’ stress and displacement was found. This provides new thoughts to analyze the influence of multivariate interaction on the lock head structure.
The Research Development of Plywood Building Templates
Authors: Zhang Zhi Jun , Jia Zhen , Li Guo Liang
Published: October 2012

This paper introduced the current situation of building templates, and compared several new building templates. Through the analysis and prospect of plywood templates, we put forward that development of templates should integrate into advanced technology to adapt the promotion of modern construction technology.
Tensile Properties of JLF-1 Steel at Elevated Temperature
Authors: Li Huai Lin
Published: October 2012

In this paper, the tensile properties of JLF-1 steel at strain rate of 0.1%/s and 0.02%/s were studied from room temperature to 873K in vacuum using engineering specimens. The strain rate does not affect YS, UTS and RA as far as the tests performed in this study. Strain hardening of JLF-1 steel decreased significantly above 673 K, RA also increased rapidly above 673 K; and the surface fractography was changed from shear fracture below 673 K to dimple fracture at 773 K and 873 K. That means JLF-1 steel becomes perfect elastic-plastic body (without strain hardening) and ductility improved with temperature increase.
Effect of Calcium Promoter on Ni-Based Catalysts Supported on α-Al2O3 and TiO2-P25
Authors: Fakeeha A.H. , Al-Fatesh A.S. , Ibrahim A.A. , Abasaeed A.E.
Published: October 2012

CH4 and CO2 are greenhouse gases. Hence, their emission to the atmosphere must be controlled to avoid the global warming. Dry reforming of methane could provide a valuable tool in alleviating this problem as well as producing synthesis gas. This process is hampered by rapid catalyst deactivation due to carbon deposition and sintering of both the support and active metal. The presented study focuses on the experimental investigation the effect of addition of Calcium promoter to 1%Ni catalysts supported on a mixed 80%α-Al2O3 and 20%TiO2-P25 support. The performance of the developed catalyst was quantified by determining CH4 and CO2 conversions, synthesis gas ratio (H2/CO) and stability. Spent and fresh catalysts were characterized by TGA, SEM and EDS. Time on stream stability tests of the promoted catalyst showed that addition of limited amounts of Ca promoter would reduce carbon formation.
Application Prospect of Basalt Fabrics Wall Material
Authors: Li Xin E
Published: October 2012

Functions of the wall and some of wall materials are introduced. Basalt filaments possess excellent properties with high strength, high temperature resistance, corrosion resistance, small hygroscopicity, small thermal conductivity and high sound absorption coefficient. High performance basalt fabrics can be gelatinized into compound cementitious materials with cement or gypsum. The performance of basalt compound boards mainly rely on the performance of basalt filaments. So basalt compound boards possess excellent characteristics with light-weight, high strength, fire prevention, sound insulation and heat preservation. It is green initiative and easy construction as new wall materials. Basalt compound cementitious materials possess good application prospect in the wall materials along with the development of production technology.
Experimental Research on the Work Performance of Ceramisite Concrete with Mineral Admixture
Authors: Cao Zhen Min , Li Li Shan , Wang Yan , Yang Wei Jun
Published: October 2012

The mechanism of effect on work performance of ceramisite concrete with two kinds of mineral admixture is analyzed and also the each effect on ceramisite concrete with different dosage of fly ash and pulverized slag mixed with concrete, and when the two mixed together, the effect on work performance of ceramisite concrete with different dosage of the admixture is analyzed, it provides a better basis to ceramisite concrete mixing.
Kinetic Spectrophotometric Determination of Ruthenium by its Catalytic Effect on the Reduction of Spadns with Sodium Hypophosphite in Micellar Media
Authors: Zhou Zhi Rong , Zhang Li Zhen
Published: October 2012

A simple kinetic spectrophotometric method was developed for the determination of trace amounts of Ru (III). The method is based on the reduction of spadns by sodium hypophosphite (NaH2PO2) in micellar media. The reaction was monitored spectrophotometrically by measuring the decrease in the absorbance of spadns at 515 nm with a fixed-time method. The decrease in the absorbance of spadns is proportional to the concentration of Ru (III) in the range 0.40–10.0 μg/L with a fixed time of 2.5–7.0 min from the initiation of the reaction. The limit of detection is 0.12 μg/L Ru (III). The relative standard deviation for the determination of 0.10 and 0.20 μg/25mL Ru (III) was 2.3 % and 2.0 %, respectively. The method was applied to the determination of Ru (III) in some ores and metallurgy products.
Effects of Activating Solution and Liquid/Solid Ratio on Engineering Properties of Metakaolin-Based Geopolymer
Authors: Yang Tzong Ruey , Chang Ta Peng , Chen Chun Tao , Lee Yuan Kai , Chen Bo Tsun
Published: October 2012

In this paper, the metakaolin is used as the raw material with aluminosilicate compounds to produce the geopolymer. The effects of three levels of two major controlling factors, the degree of polymerization of the activating solution (weight ratio of SiO2 to Na2O) of 0.4, 0.7 and 1.0 and the weight ratio of liquid to solid (L/S) of 0.7, 0.85 and 1.00 on the engineering properties of geopolymer are investigated. The experimental results show that, at age of 28 days, the compressive strength increases from the lowest 37.33 MPa (SiO2/Na2O = 0.4 and L/S = 0.7) to the highest 71.21 MPa (SiO2/Na2O = 0.7 and L/S = 0.7). While, the thermal conductivity increases from the lowest 0.39 w/mk (SiO2/Na2O = 0.4 and L/S = 1.0) to the highest 0.761 w/mk (SiO2/Na2O = 1.0 and L/S = 0.7).
Preparation and Characterization of Phenolic Foam Modified by Nitrile Butadiene Rubber Powder
Authors: Li Ling , Xu Yu Zhi , Wang Chun Peng , Chu Fu Xiang
Published: October 2012

Abstract: Phenolic-Formaldehyde(PF) foam was improved by co-foaming of PF resin modified using Nitrile Butadiene Rubber Power(NBRP) and other additives in the closing mould at 70°C. The effects of amount of NBRP on mechanical properties and microscopic structure of NBRP-PF foam were investigated. The results indicated that NBRP can improve the mechanical properties.When 2 percent NBRP of foam was used, the comprehensive performance was the best. This could be a consequence of cooperation of NBRP and PF resin.
Synthesis of Polycarboxylate: Its Characterization and Application as a Superplasticizer in Concrete
Authors: Mo Xiang Yin , Feng Xian San , Yu Chen Jie , Jing Ying Jie
Published: October 2012

Polycarboxylate was synthesized by using polyethylene glycol monomethyl ether methyl-acrylate (PEG16), methylacrylamide sodium (MAS), methacrylic acid (MAA), methyl acrylate (MA), acryl amide (AM), and sodium persulfate (SPS) and evaluated as a superplasticizer for cement particles. The formulation of the superplasticizer: n (PEG16): n (MAS): n (MAA): n (MA): n (AM) =10:18:20:37:20, and the content of the SPS was 1.2wt% of all the monomers and optimized reaction conditions (80°C, 6h) were obtained via orthogonal test and single factor experiments. The water reducing effect of the synthesized copolymers was studied in terms of reaction temperature, reaction time and PEG side chain length. In this study, flow test of cement paste measurements were performed to compare the molecular weight effect on fluidity of the copolymers. It was observed that the reaction temperature had a noticeable effect on the molecular weight of the PEG-grafted samples thus causing a significant effect on fluidity. The polycarboxylate synthesized at about 80°C has given the highest fluidity result. In addition, the reaction time 6~7 hrs was identified for the best. Furthermore, copolymers with mPEG side chains with a degree of 16 gave the highest fluidity and viscosity average molecular weight value. The initial fluidity of the cement paste containing the prepared superplasticizer (1wt%, w(water)/w(cement)=(0.29)) was 316 mm.
Green Building Materials in the Building of Application
Authors: Ke Ji
Published: October 2012

This article discusses the connotation of green building materials and basic characteristics, and analyzes the difference between green building materials and green products. Summarize the selection of green building materials, and to judge the development trend of green building materials in China. Finally, the author gives some countermeasures and suggestions on the healthy development of China's green building materials industry.
Preparation of PZT Ferroelectric Thin Films by Sol-Gel Process
Authors: You Yu Fei , Xu C. H. , Wang Jun Peng , Liu Yu Liang , Xiao Jin Feng , Dong Yu Tao
Published: October 2012

Sol-gel method is used for the formation of Pb(Zr0.63Ti0.37)O3(PZT) thin films. The initial films were formed with spin coating sol solution on silicon wafer and drying coated wet sol film at 300°C for 5min. This process was repeated for 1-4 times to obtain 4 initial films with different thicknesses. 4 initial films were annealed at 500°C for 2h to obtain PZT ceramics films. The morphologies of the surface and cross-section of PZT films were observed with a scanning electronic microscope (SEM). The phase structures of PZT films were analyzed using an X-ray diffraction meter (XRD). Experimental results show that PZT film prepared by coating wet sol on silicon once can be high smooth and compact film.
Thermodynamic Optimization Characteristics of a Type I Absorption Heat Pump within Finite Time
Authors: Zhao Xi Ling , Li Yan , Fu Lin
Published: October 2012

The absorption heat pump was studied with finite time thermodynamics. A four reservoirs model of absorption heat pump which is treated as an irreversible Carnot heat pump driven by an irreversible Carnot heat engine was established considering the heat resistance and the irreversibility of the internal cycle. A generalized optimization relationship between the main parameters and the corresponding conditions were derived. It is show that, two internal irreversibility parameters, the heat engine cycle and the heat pump cycle has different effects on system performance, and the reduction of the friction, heat loss, and internal dissipations of the equivalent heat pump cycle are more important than its reduction of heat engine cycle.
Numerical Study of the Respiratory Aerosols Transportation in Ventilated Classroom
Authors: Feng Guo Hui , Zhang Yi , Lan Xin Ying
Published: October 2012

Ventilation is important for controlling the airborne transmission of infectious respiratory diseases, particularly in crowed and enclosed spaces, where exist higher risks of cross-infection. This paper studies the spatial concentration distribution and particle tracks of students talking continuously in a classroom with two air distribution methods, including mixing ventilation (MV) and displacement ventilation (DV) using CFD simulations. The classroom is occupied by 10 students with a seating arrangement of 5 rows and 2 columns. The objective of this study is to find out which ventilation mode is more effective in removing respiratory aerosols. The simulation results indicated that the displacement ventilation with the low air supply velocity magnitude and low turbulence could remove the respiratory aerosol droplets and minimize the risk of infectious effectively compared with mixing ventilation.
Numerical Simulation and Experimental Study of Wind Distributor
Authors: Li Yi Tong , Sun Li Ying , Na Hai Tao , Liu Liang
Published: October 2012

In order to study the distribution of indoor air from wind distributor, the velocity field and temperature field in the room are simulated with AIRPAK software which uses indoor zero-equation turbulent model. To simplify the physical model of wind distributor, five model methods have been used in the modeling process. The indoor temperature and velocity distribution characteristics were obtained and did a comparative study with the experiment. The results of the study show that the model can be simplified largely, simplified model consistent with the experimental data can also save computing resources and computing time in modeling process of wind distributor.
Research on Risk Comprehensive Evaluation System of Gas Supply Company Based on WebGIS
Authors: Tang Ren Feng , Bai Yong Qiang
Published: October 2012

The normal and safe supply of gas is one key of the urban operations. The risk comprehensive evaluation of gas supply companies is even more important. According to the actual work needs, to construct the application system is indispensable based on the rich internet applications(RIA) and web-based GIS(WebGIS). Therefore the application system of risk comprehensive evaluation was established by taking gas supply company as main study object after analysis the application requirements and functions. Based on the WebGIS and representational state transfer(REST), the application framework was designed and the procedure of the risk comprehensive evaluation was drafted according to the evaluation works and the index model was constructed by the main risk factors. The application system meets the normal evaluation work, which can also be more useful for the company and government manager or decision maker.
Theoretical Analysis and Experimental Researches on Internal Heat Exchanger in CO2 Trans-Critical Cycle
Authors: Lu Hui Xia , Lv Jing , He Zhe Bin , Wang Jin Yu , Zhou Jia Wei
Published: October 2012

The change of system performance caused by regenerative cycle in different operating conditions was analyzed in this paper, comparing the cycle with or without internal heat exchanger in a CO2 trans-critical cycle. We analyzed theoretically the performance of CO2 trans-critical cycle with the internal heat exchanger, and found that the coefficient increased with the decreasing of the high side pressure and the increasing of outlet temperature in gas cooler, in a certain range of the high side pressure and outlet temperature. The evaporation temperature could be raised when the system with internal heat exchanger and at the same time the coefficient of performance could be improved obviously. At lower high side pressure, the performance coefficient could be improved significantly by increasing the suction superheat. The higher the gas cooler outlet temperature was, the more obvious the increase was.
Some Results for the Davey-Stewartson System on a Circle
Authors: Chen Tsai Jung , Fang Yung Fu , Hong Ying Ji
Published: October 2012

In this paper we consider the Cauchy problem of the Davey-Stewartson system on a circle. We establish, from a mathematical aspect, certain apriori estimates necessary to ensure the existence and uniqueness of solutions of the Davey-Stewartson system model.