期刊：
Geotechnical and Geological Engineering,2017年35(4):1439-1451 ISSN：0960-3182
通讯作者：
Guo, Youlin(guoyoulin82@163.com)
作者机构：
[Guo, Youlin; Zhao, Minghua] Geotechnical Engineering Institute, Hunan University, Changsha;410082, China;[Fu, Guihai; Li, Yongsuo] College of Civil Engineering, Hunan City University, Yiyang;413000, China;[Yu, Pengfei] Yiyang City Highway Administration Bureau of Hunan Province, Yiyang
通讯机构：
[Youlin Guo] G;Geotechnical Engineering Institute, Hunan University, Changsha, China<&wdkj&>College of Civil Engineering, Hunan City University, Yiyang, China
期刊：
Journal of Discrete Mathematical Sciences and Cryptography,2017年20(6-7):1363-1367 ISSN：0972-0529
通讯作者：
Yu, Fang(502121924@qq.com)
作者机构：
[Fang Yu] College of Civil Engineering, Hunan City University, Yiyang, 413000, China;[Fang Yu] Hunan Hetian Real Estate Development Co. Ltd., Yiyang, 413000, China
通讯机构：
[Fang Yu] C;College of Civil Engineering, Hunan City University, Yiyang413000, China<&wdkj&>Hunan Hetian Real Estate Development Co. Ltd., Yiyang413000, China
关键词：
MSC2010;90B99;Recycled concrete;Large building;Compressive strength;Mathematical Model
作者机构：
[彭细荣] School of Civil Engineering, Hunan City University, Yiyang;Hunan;413000, China;[隋允康] Numerical Simulation Center for Engineering, Beijing University of Technology, Beijing;100022, China
通讯机构：
[Sui, Y.-K.] N;Numerical Simulation Center for Engineering, Beijing University of Technology, Beijing, China
作者机构：
[黄戡; 曹峰; 张胜; 凌同华] School of Civil Engineering and Architecture, Changsha University of Science &, Technology, Changsha, Hunan, 410114, China;[张胜] College of Civil Engineering, Hunan City University, Yiyang, Hunan, 413000, China
通讯机构：
[Ling, T.] S;School of Civil Engineering and Architecture, Changsha University of Science & Technology, Changsha, Hunan, China
期刊：
Journal of Engineering Science and Technology Review,2017年10(1):55-60 ISSN：1791-9320
通讯作者：
Xinzhong, Wang(wxz0419314@163.com)
作者机构：
[Chuanxi, Li; Xinzhong, Wang] School of Civil Engineering and Architecture, Changsha University of Science and Technology, Changsha, 410114, China;[Wei, Zhou; Xinzhong, Wang; Heliang, Xie] School of civil engineering, Hunan City University, Yiyang, 413000, China
通讯机构：
School of Civil Engineering and Architecture, Changsha University of Science and Technology, Changsha, China
作者机构：
[彭细荣; 张锴; 曹国辉] College of Civil Engineering, Hunan City University, Yiyang, 413000, China;[阳亮] College of Civil Engineering, Hunan University, Changsha, 410082, China
通讯机构：
College of Civil Engineering, Hunan City University, Yiyang, China
作者机构：
[刘新喜] School of Civil Engineering and Architecture, Changsha University of Science and Technology, Changsha, 410114, China;[高乾丰] College of Civil Engineering and Mechanics, Xiangtan University, Xiangtan, 411105, China;[邓宗伟] School of Civil Engineering, Hunan City University, Yiyang, 413000, China
通讯机构：
School of Civil Engineering, Hunan City University, Yiyang, China
作者机构：
[徐赞; 曹文贵; 张超] Geotechnical Engineering Institute, Hunan University, Changsha, 410082, China;[徐赞] College of Civil Engineering, Hunan City University, Yiyang, 413000, China
通讯机构：
Geotechnical Engineering Institute, Hunan University, Changsha, China
作者机构：
[张再华; 刘泽龙; 贺冉; 舒兴平] Steel Structural Institute of Civil Engineering College, Hunan University, Changsha, 410082, China;[肖时杰] College of Resources and Planning Sciences, Jishou University, Zhangjiajie, 427000, China;[张再华; 贺冉] College of Civil Engineering, Hunan City University, Yiyang, 413000, China
作者机构：
[刘泽龙; 张再华; 贺冉; 舒兴平] Steel Structural Institute of Civil Engineering College, Hunan University, Changsha, 410082, China;[肖时杰] College of Resources and Planning Sciences, Jishou University, Zhangjiajie, 427000, China;[张再华; 贺冉] College of Civil Engineering, Hunan City University, Yiyang, 413000, China
作者机构：
[隋允康] Numerical Simulation Center for Engineering, Beijing University of Technology, Beijing, 100022, China;[彭细荣] School of Civil Engineering, Hunan City University, Yiyang, Hunan, 413000, China
作者机构：
[魏丽敏; 付贵海] School of Civil Engineering, Central South University, Changsha, 410075, China;[付贵海; 邓宗伟; 蒋建清] School of Civil Engineering, Hunan City University, Yiyang, 413000, China
通讯机构：
School of Civil Engineering, Central South University, Changsha, China
通讯机构：
[Cao Guo-hui] H;Hunan City Univ, Coll Civil Engn, Yiyang 413000, Peoples R China.
关键词：
PC box girders;long-term load experiment;flexural behaviors;cracks;static performance
摘要：
Long-term load and flexural failure experiments are carried out on two prestressed concrete (PC) simply supported box girders. In the long-term load experiment, girder-1 (G1) is in an elastic state, while girder-2 (G2) is in a cracking state. To investigate the influence of cracking on the flexural behaviors of PC simply supported box beams, the experiment results are analyzed from many aspects, such as load–deflection, load–strain, and failure mode. Experiment results show the following: 1) the shrinkage and creep of concrete have considerable influences on the long-term deflection and strain of the two girders; 2) in the flexural failure experiment, the cracks and ultimate loads of the two girders are close. The rigidity degeneration of G2 is significantly faster than that of G1, and thus G2 shows nonlinear characteristics earlier; 3) to prove the validity and rationality of the current code, the cracking load and ultimate load of the two girders are calculated according to the current code.
作者机构：
[蒋建清] School of Civil Engineering, Hunan City University, Yiyang, Hunan, China;[杨果林] School of Civil Engineering, Central South University, Changsha, Hunan, China
作者机构：
[Cao Guo-hui; Zhang Kai] Hunan City Univ, Coll Civil Engn, Yiyang 413000, Peoples R China.;[Hu Jia-xing] Hunan Univ, Coll Civil Engn, Changsha 410082, Peoples R China.
通讯机构：
[Cao Guo-hui] H;Hunan City Univ, Coll Civil Engn, Yiyang 413000, Peoples R China.
关键词：
prestress;relaxation loss;shrinkage and creep;theoretical analysis;calculation model
摘要：
The calculation model for the relaxation loss of concrete mentioned in the Code for Design of Highway Reinforced Concrete and Prestressed Concrete Bridges and Culverts (JTG D62—2004) was modified according to experimental data. Time-varying relaxation loss was considered in the new model. Moreover, prestressed reinforcement with varying lengths (caused by the shrinkage and creep of concrete) might influence the final values and the time-varying function of the forecast relaxation loss. Hence, the effects of concrete shrinkage and creep were considered when calculating prestress loss, which reflected the coupling relation between these effects and relaxation loss in concrete. Hence, the forecast relaxation loss of prestressed reinforcement under the effects of different initial stress levels at any time point can be calculated using the modified model. To simplify the calculation, the integral expression of the model can be changed into an algebraic equation. The accuracy of the result is related to the division of the periods within the ending time of deriving the final value of the relaxation loss of prestressed reinforcement. When the time division is reasonable, result accuracy is high. The modified model works excellently according to the comparison of the test results. The calculation result of the modified model mainly reflects the prestress loss values of prestressed reinforcement at each time point, which confirms that adopting the finding in practical applications is reasonable.
作者机构：
[张锴; 曹国辉] School of Civil Engineering, Hunan City University, Yiyang, China;[胡佳星] School of Civil Engineering, Hunan University, Changsha, China;[张胜; 张旺] School of Civil Engineering and Architecture, Changsha University of Science &, Technology, Changsha, China
通讯机构：
School of Civil Engineering, Hunan City University, Yiyang, China
期刊：
Journal of Engineering Science and Technology Review,2016年9(5):158-163 ISSN：1791-9320
通讯作者：
Xinzhong, Wang(wxz0419314@163.com)
作者机构：
[Chuanxi, Li; Xinzhong, Wang] School of Civil Engineering and Architecture, Changsha University of Science and Technology, Changsha, 410114, China;[Wei, Zhou; Xinzhong, Wang] School of civil engineering, Hunan City University, Yiyang, 413000, China
通讯机构：
School of Civil Engineering and Architecture, Changsha University of Science and Technology, Changsha, China
