bluuebunny/crossref_metadata_2025 huggingface dataset:
Study on the Mechanical Properties of Rubber Gasketed Joints in Segmented Pipeline
Authors: Han Yang , Duan Jun Feng , Qin Yan Yan
Published: October 2011

The mechanical properties of rubber gasketed joints in segmented pipeline are studied in this paper. The analytical results show that the axial tension of flexible joints is mainly effected by the friction between the pipe and the rubber ring in flexible joints, and the bending property is mainly controlled by the hyper-elastic performance of rubber gasketed and the geometry clearances designed at the pipe joints. Based on the test results, rubber gasketed joints are effective in providing a leak proof and flexible connection for jointed buried pipelines.
Influence of Different Anode Materials on the Treatment of Azo Dyed Wastewater by Electrochemical Method
Authors: Zhao Yu Hua , Jin De Cai , Cang Xiao Yi , Li Jie
Published: October 2011

The paper aimed to compare removal effects in azo dyed wastewater by electrochemical method with different anode materials, and explored the impact of current density on the treatment effect with different electrode materials. Carbon felt, aluminum, iron were served as the anodes, graphite columns were served as cathodes of apparatus. The hydraulic retention time was 12 hours, current density is respectively 0.01, 0.024, 0.048, 0.071, 0.083 mA/cm² for the test. The results showed that the removal ratio of dye concentration had a rising trend as the current density increased. The removal ratio by the apparatus with iron anode was best, aluminum second. When the current density was 0.083 mA/㎝², the removal ratio of dye concentration was 97.63%, but the other two were only 62.01% and 29.05%. The removal of colority and COD with aluminum anode was best, when the current density was 0.048mA/㎝², the removal ratio of colority and COD was respectively 71.39% and 44.41%. Thus, the removal of dye concentration by electrochemical method with iron anode was best, while aluminium anode was good for colority and COD. The treatment of azo dye wastewater by carbon felt anode electrochemical didn’t get significant effect.
Study on the Value of Serial Properties:Taking Tianjin’s Beitang Battery as a Case
Authors: Yan Mi , Ji Hong , Aoki No Nuo , Xu Su Bin
Published: October 2011

Beitang Battary is an important part of coastal defense system heritage in Tianjin Binhai New Area.The paper examines Beitang Battary as serial properties,explores its connotation and extension,and elucidates the importance of protecting overall defense system.The study discuss its value from the perspective of serial properties protection and brings forwards preservation suggestion.
The Research of Changchun Parks’ Construction and Development
Authors: Mo Wei , Leng Mei
Published: October 2011

By researching the process of Changchun parks’ construction and history development during each stage of modern times, the article expounds the up-and-down modern history of Changchun from another perspective, and also facilitates the planning and construction of Changchun modern parks. It analyzes, evaluates, and summarizes the planning and construction of Changchun modern parks, hoping to provide the necessary reference for the construction of "green livable cities" of Changchun.
The Contribution of Overseas Chinese towards the Development of Modern Zhongshan City
Authors: Zhang Hua , Fang Xiao Shan , He Xu Wei
Published: October 2011

Zhongshan is a famous hometown to many overseas Chinese. Overseas Chinese from Zhongshan living abroad are concerned about the urban development of their hometown and have offered tremendous financing resources. They have returned to their hometown and participated in government, invested in municipal development, improved public services, established industry and donated to schools. These efforts not only led to Zhongshan’s business economy boom, but also effectively promoted the urban construction process of modern Zhongshan. This paper traces the urban construction in Zhongshan during the period of the Republic of China, and investigated the great contributions of overseas Chinese to the urban development of modern Zhongshan.
Research on Quantified Performance Index for Steel Reinforced Concrete Frame Structures
Authors: Wang Qiu Wei , Shi Qing Xuan , Tang Liu Jiu
Published: October 2011

The interstory drift of frame structures is caused by beams, columns and joints. The calculation formula of storey yield drift for reinforced concrete frame structures is obtained by adding above three kind of deformation, and the comparative analysis show that theoretical results have good consistency with experimental data. The expression formula of storey yield drift angle for steel reinforced concrete (SRC) frame structures are analyzed by using the same hypothesis and methods, and quantified performance index for SRC frames having a certain guarantee value are proposed according to relationship of four seismic performance levels. The conclusion obtained provide basic information for performance-based seismic design of SRC frame structures.
Transformation from an Idea to Image — An Analysis on Visual Training and Representation for a Designer
Authors: Wang Di
Published: October 2011

In design process, visual representation bridges creative thoughts, communication flow and personality style, as well as accomplishes the transformation from an idea to a physical image. Rational thinking and emotional expression supplement each other but not fetter. A designer can reach to the delicate and extensive realm of thought to show the high level of amalgamation of appearance and spirit in art representation when understanding the dialectical relationship between ideas and images.
The Particularities of the Protection of Urban Excellent Modern Architectures
Authors: Pan Ying , Tang Ding Feng , Li Zi Ming
Published: October 2011

Excellent modern architectures will be brought into Chinese architectural heritage protection system in the form of law. Their intrinsic qualities lead to the particularities of their protection strategies. This paper, using the method of contrast, analyzes the particularity of the excellent modern architectures’ protection. The analysis covers many aspects, such as the protective purpose, the protective objects, the evaluation systems, and the protection management regulations.
Semantic Network Method of Urban Design Scheming
Authors: Dong Jun , Zou Guang Tian
Published: October 2011

During urban design activity, it is necessary to emphasize the stage of Urban Design Scheming as a important link and find a reliable method. According to the characteristics of present urban design and scheming, the semantic web method is put forward as a definite and standardization platform for the more and more complex urban design problems. Because the semantic web is suitable to the characteristics of the human mind and computer, it is possible to realize the computer assist design and scheming for the designer. Thus urban design can be guided and construction of digital city can be realized.
Spatial Design Research for Urban Mitigation to Strength Urban Resilience
Authors: Nie Rui , Zeng Jian , Zhao Xiu Ping
Published: October 2011

Strengthening urban resilience is one of the main goals of urban mitigation. This document explains the concept of urban mitigation and urban resilience and demonstrates spatial relevance of hazard and vulnerability. From three levels, including urban scale, urban spatial structure and urban open space, spatial design methods for urban mitigation to strength urban resilience, namely resistance, adaptability and transformation are proposed based on characteristics of different phases of disaster process.
Investigation and Study on Cognitive Maps of City Environment — For Example as Xi’an City
Authors: Wang Yan
Published: October 2011

Cognitive map is one of the most important ways to study city image. Take the Xi’an city as example, by Cognitive map investigation and questionnaire investigation, analyze the public image, feature of identity, cognitive elements, and people’s cognition and appraise of the city environment. By analyzing the factors, which influence the city environment, we can and give valuable advice on the city environment.
Spirit of Space Renaissance of Town God’s Temple in Xi'an
Authors: Bi Jing Long , He Rong
Published: October 2011

Urban renaissance is a common problem that the whole world city is confronted by the globalization background. Through urban renaissance, we can create the city space lieu which have historical culture meaning deeply,and make these public place be full of vigour and significance,that realize spirit of space renaissance finally. As the example of Town God’s Temple in Xi'an, this article discussed under“Renaissance of Tang Dynasty’s Xi'an”, through transform and renovate urban, Town God’s Temple have formed a set of whole culture space system that make use of it's space, and have transferred historical culture information effectively, therefore have kept spirit of space in urban modern surroundings at historical area. Town God’s Temple have becomed the characteristic area of Xi'an by urban renaissance finally .
Research on Urban Religious Place Layout
Authors: Chu Chao Chao
Published: October 2011

Starting from reviewing the transformation and development of urban religious place, this paper analyzes the situations and existing problems of urban religious place layout in China at present. Based on understand of the international and domestic literature, it proposes some issues to study. Finally, it makes suggestions about the research from three aspects of basic theories, development mode and evaluation system.
The Research on the Inherited of Traditional City’s History Context in Speed Time
Authors: Qiao Zheng , Wang Tao
Published: October 2011

The inherited of traditional city’s history context is very important topic in today’s architecture design. Speed unprecedented gives the traditional city space very giant impact. Following the time develop, the idea become the core influencing the world which the speed and the space match harmoniously each other. According to this idea, the author suggest the thinking of the inherited of traditional city’s history context should match the traditional speed, and argue in the paper that the urban context should be passed down with the maintenance of traditional speed, which can be accomplished by taking such measures as the speed separation, speed control, speed transition, etc., which also express the ideas of harmonious coexistence and development together.
Research on Space Form Design of Local Culture and Custom in Qia Chuan Wetland Settlement
Authors: Xu Lan , Lei Zhen Dong , Wu Su
Published: October 2011

On the background of the tourism exploitation, according to wetland settlement local culture and custom in Qia Chuan, Shaanxi, through the interpretation of Qia Chuan existing villages to excavate regional architecture’ characteristics and elements, applied Qia Chuan wetland settlement’ local culture to architecture design ,protected it and reformed it, reinterpreted local conditions and customs with special forms of space, provided people a space which they can have a more profound understanding about local history and culture to look at with reverence. Through exploring the characteristics of the towns’ local architecture that have been creative coped and the inherited the way of the modern transformation in order to realize space deduction of modernization and regionalization in Yellow River wetland settlement local conditions and customs.
Test Study on Seismic Behavior of New Hybrid SCCC Columns
Authors: Wang Dong , Liu Yong Jun , Li Zhu Yan
Published: October 2011

In order to investigate the seismic behavior of the new circular hybrid Steel–Concrete– CFRP–Concrete column (simply called SCCC column), low cyclic reciprocating load tests are carried out for three SCCC columns. The failure mode and hysteretic characteristics are researched, and the effects of changes of CFRP tubes diameter on seismic behavior of SCCC columns are analyzed. The results show that with the diameter increase of CFRP tube, the seismic behavior of SCCC column is also increased.
Fractal of Frequency of Joints and its Application in Rock-Mass Structure
Authors: Song Yan Hui , Wang Ying
Published: October 2011

Developmental degree of the rock-mass joint is often obtained through the exploratory adit in water-power engineering and it is the vital index for evaluating rock-mass structure and quality. In this paper, easy algorithm for the fractal of frequency of joint is established by a case in a certain power station in southwest China, through this method, the fractal of the rock-mass structure in different adit sectors can be gotten easily and thus the structure type of the rock-mass can be separated from each other according to the fractal value.
Architectural Concept of Dynamic is the Origin, still is the Carrier
Authors: Rui Zhang , Zheng Qiao
Published: October 2011

This article analyzes the causes of "longevity building" and "ephemeral building" in architectural design practice. From the perspective of system theory proposed that the essence of architectural design is dynamic and dynamic process. Static factors only as a carrier of the existence of dynamic factors, establish framework for wisdom architectural design, provide new approach for architectural design.
Reflections on Ecological and Environmental Construction of New Rural Program in Underdeveloped Areas
Authors: Li Ze Xin , Chen Min
Published: October 2011

Underdeveloped rural areas have good but very vulnerable ecological environment, so the environment protection should be given priority in new rural construction. Based on the problems that rural areas have faced in ecological environment, some thoughts are given in this paper on ecological and environmental: ①To solve the conflicts between the development of rural economy and ecological environment protection, the development of eco-industry can be a key solution. ② For the point that people of underdeveloped areas live in scattered and small scale groups, which leads to difficulty in facility arrangements, some proposals are put forward on the construction of living environment in underdeveloped new rural areas.
Effect of Freeze-Thaw on the Concrete Pore Structure Features
Authors: Qu Feng , Niu Di Tao
Published: October 2011

Under action of repeated freeze-thaw cycles, different changes of pore structure features has occurred in different varieties of concrete.In this study, the average pore size of concrete and total porosity was discussed especially with the trends.Based on this, the gas diffusion model and the chloride ion diffusion model in concrete was also discussed with the pore structure,which indicated that the freeze-thaw damage of concrete pore structure will have a greater impact to the durability of concrete, and so the life of concrete structures would be affected.
The Fuzzy Space Design Strategy in Low-Carbon Ecological Construction
Authors: Yi Hong , Tang Xiao Bo
Published: October 2011

In view of the problem existing in the process of ecological construction, the overemphasis on the ecological techniques rather than the integrated consideration of spatial structure and distribution as a whole. This thesis intents to help innovate a green, ecological and energy-efficient space design idea which is more geared to the Chinese characteristics by extending and analyzing on the theory of fuzzy space, coupled with the knowledge of Chinese traditional architecture and the traditional culture, and approaching the applicational relations of fuzzy space design in the modern low-carbon social construction.
Ecological Architectural Technology Optimization Design — Longgang High School’s Cafeteria Design as an Example
Authors: Yue Peng , Liu Jia Ping , Zhou Bin , Lu Yi Xuan , Zhang Ashley Xin
Published: October 2011

Problems such as poor indoor environment, pollution to the surrounding environment and waste of water and power universally exist in the school’s cafeterias. In view of this, in the design of Hanzhong Longgang High School’s cafeteria, the pre-research was firstly made to discover and analyze the existing environmental problems and their causes; then the design objectives were brought forward to lower environmental pollution, improve indoor environmental quality, and reduce energy consumption. After that, ecological technological measures were selected and optimized to be applied to the architectural space design. Lastly, architectural scheme was created. In the architectural design, the ecological technology has been applied to achieve the proposed goals in order to create a healthy and comfortable dining environment for the students, and, at the same time accumulate experience on optimized design of ecological buildings.
The Analysis and Optimal Design for Thermal Environment of Gymnasium
Authors: Ma Bin Qi , Wang De Wei
Published: October 2011

The thermal environment of gymnasium is usually affected by many exterior environmental factors, including architecture layout, building orientation, natural lighting and ventilation. A gymnasium of one of the colleges in Xi’an city serves as an example. The building performance analysis and optimization software Ecotect are used in this paper to carry out the simulation analysis focused on the classical thermal environment of gymnasium under the consideration of the above mentioned thermal environment relevant factors.
Extenics Analysis of Activity Support Element
Authors: Dong Jun , Qi Lin
Published: October 2011

Activity support is one of eight elements which Hamid Shirvani has generalized. It is also the element which is the most direct with the relationship of people’s activities and the most difficult with operation and description in the eight elements. While Extenics is that we use the formal model to study the possibilities of expansion and the rules and methods of innovation. Extenics can make use of basic-element model to describe everything. So we can do formal analysis on the objects of study, such as activity support element. Based on activity support element, the article is using the concepts of matter-element, affair-element and relation-element in Extenics to analyze activity support element, and using the principle of divergence analysis to do expansion analysis, which can make the activity support element systematically integrate the other urban design elements among the correlative net. There is the methodological significance with scientifically processing the relationship of behavior and environment in the article.
An Analyze on Parking Environment in Residential Areas of Xi’an
Authors: Xie Dong , Chen Chen , Tang Lin
Published: October 2011

Private automobiles are popularizing among average families. At the same time, the problem of impropriate parking is also emerging which influences the quality of living environment in residential areas. Therefore, it is a priority to address the parking problems of private automobiles and create a harmonious living environment between human and automobiles in residential areas.
Research into the Building Information Model during the Whole Building Life-Cycle
Authors: Zeng Xu Dong , Zhou Wei Qiang
Published: October 2011

Construction project life-cycle management should be based on the visualization of a virtual building, through the establishment of a Building Information Model in the phase of architectural design as a life-cycle information carrier to realize complete information integration. This enables all phases and territories of the whole building life-cycle to achieve in-time information-sharing so as to overcome traditional territory management pattern. This also improves the running mode and information management during the phases of design, costing, construction and operation.
Study on Foreign Developments in Green Building Evaluation System
Authors: Li Xi Feng , Ma Xue Mei
Published: October 2011

This document first introduces the world of green building evaluation system developments ,a set of conditions suites to China’s green building evaluation system is proposed by size, function ,hierarchy , structure ,part of the five areas of comparison.
Study on the Deformation Behavior in-Plane of a New Energy-Saving Wall
Authors: Zhao Jing , Ma Chun Yan , Liu Chao , Chen Jie
Published: October 2011

This paper selects a new building material—foam concrete which can be used by the outer wall system as a self-insulation material, and designs two sets of specimens which are carried out the experimental study under low-cycle reversed loading. The paper analyzes the failure mode of the walls, hysteretic curves, skeleton curves, ductility and energy-dissipation capacity. Experimental phenomena and results show: by reasonable construction measures, the new latticed energy-saving wall compared with the normal filling wall possesses better seismic capacity and shear capacity, meanwhile the ductility and energy dissipation capacity of the wall is good to meet the engineering requirements. On this basis, the force mechanism of the specimen is discussed, calculation formula of shearing capacity is put forward, and the calculation results meet well with the experimental results.
Optimization Design Method of Sealing Concrete and Ballast
Authors: Yang Mei Liang , Zeng Zhen Hai , Zhong Fang Ping , Li Zhen Hua
Published: October 2011

As defined in optimization ideas, economical efficiency is the objective function, while the volume of sealing concrete and ballast, two independent variables, exerts impacts on the objective function value through economic parameters respectively. Constraints are founded according to the strength and stability requirements of sealing concrete and steel box, in the most unfavorable condition. At the last, Matlab is used to achieve optimal solution. This paper combined Xiangjiang River Grand Bridge Project in Changxiang express way and achieved good practical results.
The Application of New Materials in the Design
Authors: Wu Fen , Hu Wei Ping
Published: October 2011

We named the Prehistoric and primitive times by materials--- the Stone Age, Bronze Age and Iron Age are just the vivid description of the importance of the material. Some experts called the present “Synthetic material times”, the future “Allergenic material times”. In product design, new materials, as an important element of component performance, plays an important role in improving the product's features and enriching the product’s content. In this paper, I will make a reasonable description on the performance of new materials and functional requirements of products, providing designers with a selection of ideas.
Corrosion Products in Cement-Based Materials under Sulfate Partial Soaking Attack
Authors: Ma Kun Lin , Wang Wei Lun , Long Guang Cheng , Xie You Jun
Published: October 2011

The deterioration mechanism of sulfate attack on cement- based materials under partial soaking condition is very complex. This paper investigated the surface morphology, microstructure and corrosion products in different zones of cement mortar under 5% sulfate solution partial soaking condition at 360 d by methods of SEM, EDS and XRD, respectively. Results show that under partial soaking condition, cement mortar are distinguished four zones – soaking zone, wet zone, crystallization zone and dry zone. Corrosion products in soaking zone and wet zone are predominantly ettringite, showing chemical corrosion take place in those zones. Corrosion products in crystallization zone are gypsum and crystals of Na2SO4 and Na2SO4.10H2O, showing both sulfate chemical corrosion in high concentration and physical crystallization attack occur in this zone. However, there is no any corrosion product founded in dry zone.
Corrosion Behavior of Low Nickel Alloy High Strength Steel in Seawater Containing Sulfate-Reducing Bacteria
Authors: Li Fu Shao , An Mao Zhong , Duan Dong Xia
Published: October 2011

Corrosion behaviors of low nickel alloy high strength steel (LNAHSS) was studied by electrochemical impedance spectroscopy and scanning electron microscopy when the coupons of LNAHSS were exposed to the seawater culture media. As the results, LNAHSS was uniformly corroded in the fresh sterilized culture medium in a mode of active dissolution; in the culture medium with sulfate-reducing bacteria (SRB), LNAHSS was protected by the iron sulfides layer to some extent in the early stage of exposure, but severely localized corrosion subsequently occurred resulting from the localized breakdown of iron sulfides layer. So, in risks estimation, special precautions should be taken when LNAHSS serves in the environments containing SRB as the localized area can become the tress raiser.
Optimization Design for Mix Proportioning of High Strength and High Performance Concrete
Authors: Zheng Shan Suo , Wang Xiao Fei , Lou Huan Juan , Li Zhi Qiang
Published: October 2011

This paper studies the High strength and high performance concrete that is suitable for the steel reinforced concrete. In the basis of meeting the durability, strength, workability and volume stability, the mix proportioning of high strength and high performance concrete is optimized in the aspect of engineering cost . By experiments, minimum range of mix proportioning is defined which can meet the requirement of the every performance of high strength and high performance concrete, constraints are given, then, mathematical model of the optimization design for mix proportioning of high strength and high performance concrete is determined. Linear optimization problem is solved by MATLAB programming. Optimization example shows that optimization approach is feasible and effective in the paper.
Application of FRP in Geotechnical Engineering
Authors: Qin Xu , Xu Li Hua
Published: October 2011

As FRP composite has a series of advantages such as higher strength weight ratio , higher rigidity weight ratio ,erosion resistance , no magnetism and high durability , it has being widely used in civil engineering ,its main characters and applications in geotechnical engineering are introduced in this article.
Experimental Research and Theoretical Analysis on Flexural Capacity of Prestressed Concrete Hollow Slabs Strengthened with CFRP
Authors: Wang Ru Heng , Han Juan
Published: October 2011

The purpose of this paper is to focus on analyzing its flexural capacity under concentrated force at the two points of a symmetrical load after the 21 old and new different degrees of damege to prestressed concrete hollow slab is strengthened with CFRP by the different paste modes and paste quantities.Meanwhile,according to the initial loading of prestressed concrete hollow slab specimens in which the plastic state, based on the elastic-plastic theory,it presents the theoretical calculation formula of the ultimate bearing capacity produced with the consideration of the secondary load of the prestressed concrete hollow slab strengthened with CFRP.Through the experimental value of the old and new specimens compared with the theoretical one, It provides design suggestions and reference for the prestressed concrete hollow slab strengthened with CFRP,and provides an experimental basis for the repairing and reinforcing practical application of the Wenchuan disaster area.
A Simplified Method for Concrete-Filled Steel Tube Column Analysis
Authors: Pan Dan Guang , Li Zheng , Tan Jin Peng , Gao Hong Chun
Published: October 2011

To construct a finite element model of concrete-filled steel tube column which is suitable to practical engineering analysis, a double-beam (DB) element is proposed. The element is made up of two coinciding beams which simulate steel tube and kernel concrete respectively. The parameters analysis results show that a concrete-filled steel tube column should be divided into four or more DB elements to make the error of fundmental frequency less than 5%. Moreover, based on design codes of the concrete structures and steel-concrete mixed structure of tall buildings, a simplified constitutive model of kernel concrete is developed to consider the confinement effects of steel tube on the concrete. The results of numerical example show that the P-△ curve based on the simplified model is consistent with the experimental results, but the ultimate bearing capacity is less than experimental results. Therefore, the model has a reasonable reliability and can be a reference for similar engineering design analysis.
Dynamic Model Design and Tests on a Heterotypic CFST Arch Bridge
Authors: Chen Yan Jiang , Yan Wei Ming , Gu Da Peng , Li Yong
Published: October 2011

The main bridge structure of the bridge engineering cross Yitong river, on the 102 national road, is a three-Span flying swallow type special-shaped CSFT arch bridge. This paper introduces the design, process and a result of the dynamic model test of the CFST arch bridge, and introduces the dynamic test of the bridge.
Residual Bearing Capacity of Reinforced Concrete Member after Exposure to High Temperature
Authors: Bai Li Li , Wang Zhen Qing
Published: October 2011

After boundary conditions of member and thermal parameters of materials are determined, ANSYS software is utilized to analyze the maximum temperature distribution in the member under different fire duration. The equivalent cross-section economization method is given to calculate residual bearing capacity of RC member after exposure to high temperature, here, strength of reinforcement is considered as invariant, and the original section area is regarded as reduced. The numerical results are in good agreement with the experiment results of other reference, so appliance of the method is proved, Based on these, some parameters have significant influences on reduced coefficient of residual bearing capacity, such as sectional dimension, fire duration time, strength of reinforcement and concrete，ratio of reinforcement，thickness of fire-protection layer, which are analyzed and theory basis is supplied on safe monitor, repair and reinforcement of RC member after exposure to high temperature.
Study on the Role of Geogrid-Reinforced for Fly Ash Retaining Wall Basing on the Analysis of FLAC3D
Authors: Shi Wei , Han Jin , Li Yong Bin
Published: October 2011

Geogrid-reinforced retaining wall is widely used in civil engineering, the role of geogrid reinforcement and the calculations of reinforcement material in the retaining wall design need further refinement.This paper analyzes the fly ash retaining wall with and without reinforcement by using finite element software of FLAC3D,studys the impact of geogrid-reinforced function on the stability of fly ash retaining wall ,gets the design parameters of geogrid-reinforced fly ash retaining wall.The numerical results show that: the fly ash retaining walls' safety factor is lower when its height is greater than 6m,reinforcement is needed for fly ash retaining wall to improve its safety factor to ensure the stability of retaining wall.Simulate and analyze the 8m high geogrid reinforced fly ash retaining wall,the results show that: increasing the reinforcement spacing can increase the lateral and vertical displacement of geogrid reinforced fly ash retaining wall, the maximum vertical displacement of retaining wall is in the upper wall,maximum lateral displacement occurs in the lower parts of the retaining wall;the reasonable distance of 8m high fly ash retaining wall is 0.8m.
The Application of Fluoresced Gel for the First Alkali Silica Reaction Evidence in Thailand
Authors: Sujjavanich Suvimol , Won-In Krit , Wongkhamchan Wacharakorn , Dararutana Pisutti
Published: October 2011

The study of the first alkali silica reaction (ASR) case in Thailand was conducted on fluoresced gel under UV light technique. It was done on ten random cored samples from different cracked structures of ten year-aged project and the other three cored samples from no-crack structure of one building and two bridges, ages older than 40 years. It was study on areas of suspected ASR gel in the interface zone (ITZ), aggregates and paste in the vicinity. The results of reflected area indicated the evidence of ASR gel at aggregate’s rim and the nearly areas as well as in some cracks in the matrix of 9 in 11 samples of the first set. The amount of reactive coarse aggregates was found in the range of 5-90% of total coarse aggregate content, which was supported by the expansion results of same cored samples from previous study. The results of this study indicated that the fluoresced gel technique provided the satisfied results which confirmed the accelerated expansion test from previous study. They can be used as an effective means for ASR screening test of existing structures both in the field and in laboratory.
Calculation Model on Single Layer Lattice Shell Static and Dynamic Impact Analysis
Authors: Wang Xiu Li , Jiang Lie
Published: October 2011

Take single layer lattice shell hinge support model, elastic supporting model and whole structure model as object of study, systematic study the working performance of the lattice shell roof structure under different calculation model. Comparison and analysis of various calculation model of static and dynamic, aiming at the lower adopt concrete structure upper span space structure of this kind of composite structure, using different material combination structure damping ratio of practical calculation formula, separately calculated hinge support model and the whole structure model of dynamic response, results show that consider composite structure damping ratio and the whole structure modeling of the calculation model more accord with engineering practice.
Collapse Reasons Analysis of a Large Steel Silo
Authors: Sun Yue Dong , Wang Yan Pu
Published: October 2011

Through the analysis of the collapse reasons of a large steel silo, results show that the main reasons for causing this accident are the design factors, containing horizontal pressure calculation, loads combination, critical stability stress calculation and so on. Temperature stress, storage mode and discharge method, initial imperfections of steel silos are the subordinate reasons and can not be ignored.
Experimental Study on RCC Character of Additive MgO and Simulation of Crack Prevention in High Temperature Construction
Authors: Guo Lei , Cai Hai Yong
Published: October 2011

Characteristics of RCC concrete with greater proportion of magnesium oxide style in domestic are few mentioned, urgently awaits to further study. Through the test of additive magnesium oxide roller compacted concrete's characteristics, to determine the appropriate magnesium oxide style admixture of roller compacted concrete; Accurately calculation the temperature field and stress field of the simulation, the results show the mixed magnesium oxide technology and bury HDPE cooling water pipes measures combining to RCC construction of high-temperature cracking is an effective method of temperature control and crack prevention. It is for the high-temperature environment of RCC dam construction scheme has provided important scientific basis.
Temperature Field Simulation and Analysis of the Frame Column under Fire Based on ABAQUS
Authors: Li Feng Bin , Hu Wei Bing , Wu Yao Peng
Published: October 2011

Based on researches in material properties of reinforced concrete under high temperature, and combined with the whole process of fire, the fire-resistance test curve of building components suggested by ISO834 instead of the actual heating-up process. nonlinear transient temperature field simulates and analyses under fire of concrete frame columns based on Abaqus in this study. And temperature field distribution laws of column section are obtained. Conclusions of the paper are helpful to further understand of the mechanical properties of frame column under high temperature, and provide theoretical support for safety evaluation and reinforcement techniques of the structure after fire.
Searching Method of Potential Sliding Surfaces in the Rock Slope by Crack Network Simulation
Authors: Zhang Yong , Nie De Xin , He Jiang Da
Published: October 2011

In the process of evaluating the stability of some rock slopes, the discontinuities which mainly destroy the stability of future slope can not be understood and the locations of the slope can not be determined because of lacking of the exploration data. This paper determines the combination molds and the location of potential sliding surfaces using the method of crack network simulation to do statistics about all the discontinuities, which aims to resolving the problems of determining the locations and idiographic conformations of potential sliding surfaces in the rock slope.
Creative Design on Portable Emergent Building after Earthquake
Authors: Peng Hu , Bu Nuo , Gu Lin , Xu Zhou
Published: October 2011

Following with the Wenchuan Earthquake of 2008 in China, the Haiti Earthquake of 2010 and so forth, a series of geologic hazards occur all around the world, and they are becoming more disastrous. Measures should be taken to prevent and reduce the disasters; however, providing accommodation for the refugees is an emergent issue after earthquake as well. Compared with the traditional temporary dwellings, the newly designed ones, whose properties, as contingent, portable, functional, humanized and periodical, can meet all needs in the new environment. The authors conduct a careful research on the design of this temporary dwelling, and later strengthen and develop its portable advantage in order to provide new choice for the accommodation for the refugees and other applications in future.
Experimental Study on Torsion Behaviors of Angle Steel Reinforced Concrete Beams
Authors: Chen Zong Ping , Zhong Ming , Chen Yu Liang , Zhang Xiang Gang
Published: October 2011

In order to research the mechanical property of angle steel reinforced concrete beams, 7 specimens were designed for pure torsion experiment. And three running parameters which are sectional steel disposition, thickness of concrete cover and concrete strength are taken into consideration. Base on the test, the torque-torsion angle curve, torque-strain curve, cracking torque, ultimate torque and other important data are obtain. The influences of those parameters are analyzed.
Meso-Level Analysis on Bending Properties of Steel-Polypropylene Hybrid Fiber Concrete
Authors: Zhang Ya Fang , Liu Hao , Li Lin
Published: October 2011

Two kinds of fiber, which are steel fiber with high elasticity modulus and polypropylene fiber with low elasticity modulus, have been incorporated into concrete in order to improve its mechanical properties of low strain capacity. To study the impact of flexural strength of hybrid fiber concrete, in this paper, a meso-level numerical model of steel-polypropylene fiber reinforced concrete has been established. By changing the incorporation ratio of two kinds of fiber, the optimized ratio has been identified. The results indicate that when two kinds of fiber are added, brittleness of concrete has been significantly improved.
Evaluation of the Impact Formulae for Rigid Projectile Striking on Concrete Target
Authors: Wu Hao , Fang Qin
Published: October 2011

Based on the large amounts of field impact tests with different projectile nosed shapes, the abilities of the existing classical empirical and semi-empirical impact formulae in predicting the local damage of normal and high strength concrete targets (NSCT & HSCT) under the strike of rigid projectile were evaluated. It finds that, firstly, for the penetration depth, the Forrestal and Chen & Li semi-empirical formulae, BRL and Whiffen empirical formulae are advised for the NSCT under the impact of ogive nosed projectile; and Chen & Li semi-empirical formula and ACE empirical formulae are advised for the NSCT under the impact of special nosed projectile; the dimensionless penetration depth of NSCT increases linearly with the non-dimensional impact factor. Secondly, for the penetration depth, Chen & Li semi-empirical formula is advised for the HSCT under the mid-to-high speed impact, and the existing formulae are not applicable while the speed of the projectile was relatively low. Thirdly, for the perforation mode of the target, the BRL and Chang empirical formulae are advised for the NSCT, and the Chen semi-empirical formula, ACE and BRL empirical formulae are advised for the HSCT.
Transverse Vibration Analysis of Buried Pipeline under Earthquake Interaction
Authors: Hao Ting Yue
Published: October 2011

The vibration of buried pipeline is influenced by inner fluid and outer constrained soil. Euler-Bernoulli beam is analyzed in the vibration model of buried pipeline, using the Hamilton principle. In addition, the differential equations of transverse vibration of buried pipeline deduced by the mechanical model are transformed into basic form of dynamics equations, considering earthquake excitation as random wave. Using the method of the elasticity time-travel analysis to programming, the pipe element, the soil parameter and the earthquake dynamic parameter are analyzed in the Matlab software. With soil from soft to hard, the response of piping displacement becomes smaller and smaller. In the same soil, the earthquake damage rate of the piping becomes increaser and increaser with earthquake intensity increasing.
On the Load of Reinforced Concrete Column by Seawater Corrosion
Authors: Lin Yue Zhong
Published: October 2011

The reinforced concrete construction of port, wharf, inshore platform etc, which expose in the bad environment, can suffer influence of the corrosion and lower its safety. Particularly with the seawater corrosion, the reinforced concrete construction will suffer to break easily and result a bigness of loss. Therefore, the construction's safe and dependable increasingly become the important problem that study by people. The paper tested the load about 15 experiment columns of reinforced concrete, which are eroded in the artificial seawater corrosion, studied the load changing of reinforced concrete column which in different times of suffering decay. It afforded the basis for analysis the load of reinforced concrete construction in the corrosion environment.
Treatment of the Domestic Sewage by the Lab-Scale Sub-Surface Horizontal-Flow Wetland
Authors: Lin Meng , Han Yun
Published: October 2011

Abstract：The constructed wetland is a new kind of wastewater treatment developing in recent years, which is very suitable for the regional characteristics of Shaanxi province. The design of the constructed wetlands is developed from the traditional sub-surface horizontal-flow wetlands (SSHFW). Two groups of wetlands were designed in parallel, and each single wetland can also became the vertical-flow wetland system. Aerating in front of the constructed wetlands is to study the removal efficiency of the organics. Test indicators contain SS、COD、Nitrogen、Phosphor and the rate of nitrification and de-nitrification. According to the experiments of the self-designed SSHFW, the removal efficiency of the SS, COD, NH4+-N、TN and TP were 92%, 82%, 40%, 46.2% and 70% respectively. The strength of nitrification and de-nitrification of the packing reached to 0.35mg/(kg.h) and 3.32mg/(kg.h). On the basis of the Langmuir adsorption isotherm equation, the adsorption quantity of coarse sand and gravel were 405.2mg/kg and 498.6mg/kg. The quality of the effluent met the primary standard of B-standard in the discharge standards of pollutants for municipal wastewater treatment plant (GB18918-2002).
Design and Analysis of Energy Storage System Applied to Building Energy Smart Grid Based on Natural Gas Based Distributed Energy System(NDES-SG)
Authors: Li Hong Qiang , Kang Shu Shuo , Dong Wen Jing , Cai Bo , Zhang Guo Qiang
Published: October 2011

In the early research work,the concept of building energy smart grid based on natural gas based distributed energy system is proposed. For design of energy storage system applied to NDES-SG, basic principles of system design are given which follows energy saving and efficiency increasing in this paper. To interpret integration, energy saving potential and system evaluation method of NDES-SG, Combining with design principles of energy storage system, a simplified typical case system is presented. The influence of energy storage system design on the NDES-SG performance is studied taking ice thermo storage system as an example and system energy saving rate for evaluation criteria. The results show that NDES-SG with a reasonable storage system design can realize energy saving rate approximately 30% compared with NDES-SG without energy storage system. NDES-SG system energy efficiency is further improved.
Numerical Simulation and Analysis of Velocity Field in Folding-Type Air Filters
Authors: Wu Yi Ren , Shen Heng Gen , Fang Min , He Jin
Published: October 2011

In this paper we contrast the velocity fields of uniform and non-uniform porous filter media in folding-type air filters under different porosity conditions by numerical simulation. In addition, the non-uniformity of those velocity fields are measured and calculated. The results show that the non-uniformity of air flow velocity is related to pressure drop, and regarding the media whose porosity is above 95% (Δ＞95%), an effective way to improve the velocity uniformity and reduce the pressure drop is to increase the porosity of filter media and make the media capture particles evenly.
Study on the Bending Mechanical Properties of Bamboo Plywood Used Middle Temperature PF Resine
Authors: Han Jan , Zou Yue
Published: October 2011

The bending mechanical properties of bamboo plywood which was glued with phenol formaldehyde (PF) resine were detected and analysised. The study results showed that the differences of the bending strength (MOR)and the elastic modulus(MOE) of bamboo plywood prepared separately within 110-130°C were not large, and MOR and MOE exceeded all the targets ruled by JB/T 156-2004. It was proved that the property of this kind of middle temperature PF resine was very well for using in bamboo plywood. When the load was the same, the differences of the deflection、the stress of the bamboo plywood prepared on the different hot-pressing temperature were very small too, but some differences existed in the those strains，and the strains on the lower sursurface of the boards were larger than those on upper surface. When the load was smaller, The deflection、stress and strain of the boards linearly changed with the load increase, which proved that the bamboo plywood mainly produced elastic deformation under this circumstances.
The Research Progress of New Cementing Materials
Authors: Wang Yun
Published: October 2011

Cementing materials are one of the most indispensable materials for national economy and people's lives. In order to adapt new materials development demand and realize sustainable development, the present researches situation of new cementing materials have been summarized and analyzed from three aspects below: the usage of industrial wastes, organic materials, natural materials to develop new cementing material as well as developing other new cementing materials in the paper, and it also provided a reference for the new cementing material development.
A Study of the Influence of FGD Gypsum Used as Cement Retarder on the Properties of Concrete
Authors: Duan Peng Xuan , Zhang Ye , Miao Yuan Chao , Li Ying
Published: October 2011

This paper describes replacing natural gypsum with FGD gypsum as cement retarder, the influence on the working performance, compressive strength and admixture adaptability of concretes, which were prepared with fly ash cement, slag cement and ordinary Portland cement. The results indict the FGD gypsum instead of natural gypsum used as cement retarder has little difference on the working performance of concrete and additionally the FGD gypsum has no negative influence on the compressive strength and admixture adaptability of concretes.