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Law of Stiffness Degradation of the PC Box-Girder Bridges with Web Cracking HUANG Haidong a, XIANG Zhongfu b, FENG Ruishengc School of Civil Engineering & Architecture, Chongqing Jiaotong University, Chongqing, china ahhdhao@163.com , bxzf8246@126.com, cfengruisheng@163.com Key words: Bridge engineering; smeared crack model; inclined cracks on the webs; reduced stiffness.

Nowadays, polymeric composites reinforced with natural fibers are being considered in the civil engineering area.

Application of carbon fiber cloth in reinforcement of metro tunnel disease Yu jie Li1,2,Hui jie Xu2,Yuan Zhang2,Juan Juan Yao1,2 1.School of Civil Engineering, Beijing Jiao tong University, China 2.Beijing Mass Transit Railway Operation Corporation LTD Subway Operation Technology Centre, China aliyujie3036119@163.com Keywords: metro, mining method, carbon fiber cloth, disease Abstract.
This introduced reinforcement measures, which uses carbon fiber cloth in metro diseases could guide in the same engineering. 1.
This introduced reinforcement measures, which uses carbon fiber cloth in metro diseases could guide in the same engineering. 5.
References [1] Wang Mengshu: The construct technology of tunnel and underground engineering in China (China Communications Publications, China 2010)
[2] Zhang Zhijun: Treatment of crack in lining of Qing-shashan tunnel, volume 4, Progress in Railway Engineering(2006),(in Chinese)

STUDY ON THE LAYOUT OF WATER-FILLED RAFT WEC IN WAVE FARM Zhigang Bai1, a, Lianbo Shi 1, b 1School of Civil Engineering, Tianjin University, Tianjin, 300072, China azhigangbai@tju.edu.cn, b lbshi@foxmail.com Keywords: Water-filled raft, WEC, MIKE21 BW, Layout of wave farm Abstract.
Among them, MIKE21 is a professional modeling and simulation engineering software, and is well known as a tool that provides a design environment for engineering, coastal management and planning applications.
J., Ana Brito e Melo, Sarmento A: the Eighteenth (2008) International Offshore and Polar Engineering Conference, Vancouver, BC, Canada, July 6-11, 2008 [3] Urban Henfridssona, Viktoria Neimanea, Kerstin Stranda, et al: Renewable Energy, Vol.32 (2007), p.2069–2084` [4] MIKE 21 BW, Spectral Waves FM modules, user guide, DHI Ltd 2008 [5] Jens Peter Kofoed, Peter Frigaard, Erik Friis-Madsen, Hans Chr.

The Research and Application of Pumping Ultra-Early Strength Concrete Yuezhong Lin 1,a and Dongcai Lin 2,b 1The School of Civil and Architecture Engineering in Shandong University of science and Technology Qingdao China 266510 2The School of Resources and Environmental Engineering in Shandong University of science and Technology Qingdao China 266510 ajcssust@163.com , b6057170@163.com Key words: Ultra-Early-Strength； Concrete；Pumping Abstract: With the gob-side entry retaining technology in coal mining project, the materials research of backfill for mine gateway side and development to become the focus of attention.
This study is based on the need of Jining well to adopt 42.5R portland cement, Tj-1 early strength agent, Tj-1 super plasticizer, prepared from 8 hours to form removal, 16 hours strength of up to 6.2MPa, 24 hours strength of 12MPa, 28 day strength to 43MPa, and the construction of super-excellent early strength pumping concrete, and obtained satisfactory results through engineering.
Raw materials and test methods Raw materials Mechanical calculation based on the engineering project needs and need concrete strength grade C30, but the early strength to meet the 16-hour requirement can hold charge, or 8 hours to form removal, 16 hours to reach the design strength of 20%, 24 hours to reach the design strength 40% of the material for this choice are as follows: (1) Cement: When the real estate license in the United 42.5R ordinary portland cement
(6) water-reducing agent: According to the engineering requirements determined through the ultimate test by TJ-1 type water reducing agent, the water-reducing agent for the pale yellow powder
In this study, 4 factors and 3 levels orthogonal design, the design is shown in Table 2.1 Tab. 2.1 Concrete Mixing Ratio Design Serial number Water-cement ratio Fly Ash Early strength agent water-reducing agent 1 1（0.40） 1(10%) 3（3%） 2（1.5%） 2 2（0.42） 1(10%) 1（2%） 1（1%） 3 3（0.44） 1(10%) 2（2.5%） 3（2%） 4 1（0.40） 2(15%) 2（2.5%） 1（1%） 5 2（0.42） 2(15%) 3（3%） 3（2%） 6 3（0.44） 2(15%) 1（2%） 2（1.5%） 7 1（0.40） 3(20%) 1（2%） 3（2%） 8 2（0.42） 3(20%) 2（2.5%） 2（1.5%） 9 3（0.44） 3(20%) 3（3%） 1（1%） The strength of 8h and16h and 1d and 3d and 7d and 28d were measured based on the needs of engineering.

Study on Stability of Highway Subgrade Slope in Desert Region HeJingyu1,a, LiuGuohua2,b 1 College of Civil engineering and Mechanics, Central South University of Forestry and Technology, Changsha, Hunan 2 CCCC-Second Highway Engineering Meng Xing Engineering Co.
But at present, affected by the special engineering geological environment in desert areas, the work must be majorly planned and considered before the highway project is set that how to reduce the construction cost while ensuring the desert highway construction quality, and maximizing the maintainance and further improvement of desert environment.
Domestic and foreign researches, tests and engineering observations show that the sliding surface basically keeps as a flat surface to loose, single grain structure of the sand body.
Roadside protection engineering measures can be appropriately reduced.

Analysis of Anti-seismic Fortified Length of Tunnel Portal in High Seismic Intensity Area Linjie Chen1,2, a, Bo Liang2,b 1Key Laboratory of Bridge-Structure Engineering Ministry of Communications, Chongqing Jiaotong University, Chongqing, 400074, China 2School of Civil Engineering and Architecture, Chongqing Jiaotong University, Chongqing, 400074, China aclj625@126.com, bliang_laoshi@126.com Keywords: High seismic intensity area, Tunnel portal, Anti-seismic fortified length, Viscous-spring Boundary, Time history analysis.
Calculation Model and Parameters Engineering Specifications.
[2] X.Q.Wang, L.D.Yang, W.H.Gao: Chinese Journal of Rock Mechanics and Engineering.
[5] I YSMER J, KULEMEYER R L: Journal of Engineering Mechanics Division.
Du: Chinese Journal of Geotechnical Engineering Vol. 28 (2006), p. 1070–1075, In Chinese

Constitutive Model of Strain Softening for Soft Rock Li Song1,a, Hongjian Liao1,b, Hangzhou Li1,2,c* 1 Department of Civil Engineering, Xi’an Jiaotong University, Xi’an 710049, China 2State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, China asongli@mai.xjtu.edu.cn, b hjliao@mail.xjtu.edu.cn, *c Corresponding author: lihangzhou77@163.com Key words: soft rock, constitutive model, unified strength theory Abstract.
A modified equation of unified strength theory is proposed that is convenient to be applied in geotechnical engineering where compression is customarily taken as positive.
Such assumptions decrease the accuracy of these models, and hence may not be applicable in geotechnical engineering.
Z011007), and Key Laboratory of Western Mineral Resources and Geological Engineering (Chang’an university) of Chinese ministry of education(CHD2010JC143).
Engineering Geology Vol. 75( 1) (2004) p.89-106

Tension-type anchor numerical calculation by energy method Sisi Liu1, a, Xueliang Jiang1,b 1 College of Civil Engineering and Mechanics, Central South University of Forestry and Technology, Changsha, Hunan, 410004, China a30849650@qq.com, b284893100@qq.com Keywords: Tension-Type Anchor; Energy Principle; Numerical Calculation; Load-Displacement Curve; Ultimate Anchorage Length Abstract.
The analysis results can provide the reference for engineering design.
In engineering practice, there is a threshold value of anchorage body length.
The results of the calculation program can provide a reference to engineering practice.
References [1] Zhongxin Jiang: Chinese Journal of Geotechnical Engineering, VOL. 6 (2001), p659 (in Chinese) [2] Guojin Cao, Hongdao Jiang, Hongmei Xiong: Chinese Journal of Geotechnical Engineering, VOL. 7 (2003), p1141 (in Chinese) [3] Quanming Zheng: West-China Exploration Engineering, VOL. 2 (2000), p27 (in Chinese) [4] Ying Xu, Biyong Zheng: Journal of Nanjing Engineering Institure, VOL. 3 (1994), p24 (in Chinese) [5] Chunyan Ji, Haijuan Zhu: Journal of Nanjing Engineering Institure, VOL. 1 (1995), p71 (in Chinese) [6] Dejun Gao, Weiya Xu: J.

Internal Force Calculation and Analysis of Precast Reinforced Concrete Composite Thermal Insulation of External Wall Ying Wang College of Civil Engineering of Changchun Institute of Technology Changchun,China ccwy121@sina.com Keywords: compound insulation external wall panels, whole board with openings, finite, maximum bending moment.
Identification the internal force calculation formula of whole precast reinforced concrete composite insulation external wall with openings.In engineering on wall panels provide a basis for safe use..
Using the program Matlab to do regression fitting, regard the three combined factors a/b,lx/L,ly/H as three independent variables X1,X2,X3; regard the combined factor Mymax/Mxmax as independent variable Y. so the regression model is (5) Using the program Matlab to regress the function , after fitting ,checking and calling function, finally get the coefficients of the formula: α=0.1869, β=1.7077,γ=-1.5021,so the formula is （6） Conclusion Checking the accuracy of the formula(3) and formula(6) ,take the known variables into the formula ,calculate the inner force bending moment again , the corresponding bending moment and deviation,The table 3 and table 4 provides a part of bending moment and deviation, the deviations of the results are all less than 5% and less than 7%,The higher accuracy of the formula can meet the engineering
References [1] Zurong Dou , Renfan Sun Calculation and Analysis of the Frame structure of Precast Reinforced Concrete Composite of External Wall Earthquake Resistant Engineering and Retrofitting, August(2010)(In Chinese)