期刊：
International Journal of Microstructure and Materials Properties,2018年13(3-4):135-146 ISSN：1741-8410
通讯作者：
Yu, F.
作者机构：
1. Department of Railway Engineering and Civil Engineering, Shandong Polytechnic, Jinan 250104, China;2. Jinan Rail Transit Group Co., Ltd., Jinan, China, 250101, China;3. Jinan Rail Transit Group Co., Ltd., Jinan, China, 250101, China;4. College of Civil Engineering, Hunan City University, Yiyang Hunan, 413000 China
通讯机构：
College of Civil Engineering, Hunan City University, Yiyang Hunan, China
关键词：
continuous temperature variation;early age concrete;splitting tensile strength;strain;fatigue;strength
摘要：
The stiffness of concrete members and the free energy of material degenerate under the continuous temperature change, and the strain error exists. In order to solve the above mentioned problems, Early-age concrete strain error detecting method under continuous temperature change is proposed. Through accurate measurement of concrete strain error, the nonlinear creep model of early age concrete structure under continuous temperature change is deduced. The coupling relationship between material stress and creep is quantitatively analysed to improve the strength of concrete. A method for detecting early age concrete strain error under continuous temperature change based on concrete splitting tensile strength microscopic analysis and low cycle fatigue test is proposed. The nonlinear relationship model of concrete strain amplitude and the number of fatigue cycles under continuous temperature is established. Considering constraint parameters of concrete such as buckling, fatigue and strength, concrete constitutive model is constructed. Test results show that the method used to detect early age concrete strain error under continuous temperature change has better reliability and strain error test results and experimental results are in good consistency.
作者机构：
[蒋建清; 唐葭; 刘霁] School of Civil Engineering, Hunan City University, Yiyang 413000, China;[刘霁] School of Resources and Safety Engineering, Central South University, Changsha 410075, China
通讯机构：
School of Civil Engineering, Hunan City University, China
作者机构：
[王宏伟; 刘霁; 何美丽] College of Civil Engineering, Hunan City University, Yiyang 413000, China;[刘浪; 刘霁] School of Resources and Safety Engineering, Central South University, Changsha 410083, China;[刘浪] School of Geology Engineering and Geomatics, Chang'an University, Xi'an 710054, China
通讯机构：
College of Civil Engineering, Hunan City University, China
摘要：
The response surface method (RSM) is one of the main approaches for analyzing reliability problems with implicit performance functions. An improved adaptive RSM based on uniform design (UD) and double weighted regression (DWR) was presented. In the proposed method, the basic principle of the iteratively adaptive response surface method is applied. Uniform design is used to sample the fitting points. And a double weighted regression system considering the distances from the fitting points to the limit state surface and to the estimated design points is set to determine the coefficients of the response surface model. Compared with the conventional approaches, the fitting points selected by UD are more representative, and a better approximation in the key region is also observed with DWR. Numerical examples show that the proposed method has good convergent capability and computational accuracy.
作者机构：
[刘霁; 何美丽] College of Civil Engineering, Hunan City University, Yiyang 413000, China;[周健; 刘浪; 刘霁] School of Resources and Safety Engineering, Central South University, Changsha 410083, China
通讯机构：
College of Civil Engineering, Hunan City University, China
期刊：
Proceedings of the 12th International Conference on Engineering, Science, Construction, and Operations in Challenging Environments - Earth and Space 2010,2010年:2821-2828
通讯作者：
Du, T.(tingdu@126.com)
作者机构：
[Du, T.] School of Civil Engineering and Mechanics, Huazhong University of Science and Technology, 430074, Wuhan, China;[Liu, J.] Department of Civil and Environmental Engineering, Wuhan Engineering Institute, 430080, Wuhan, China;[Liu, Z.X.; Lin, H.L.] Commercial Concrete Company of No. 3 Construction Bureau of China, 430070, Wuhan, China;[Wang, W.H.; Du, T.] School of Civil Engineering, Hunan City College, 413000, Yiyang, China
作者机构：
[刘霁] School of Civil Engineering and Mechanics, Central South University of Forestry and Technology, Changsha 410004, China;[周智勇; 陈建宏] School of Resource and Safety Engineering, Central South University, Changsha 410083, China;[李云; 刘霁] College of Civil Engineering, Hunan City University, Yiyang 413000, China
通讯机构：
School of Civil Engineering and Mechanics, Central South University of Forestry and Technology, China
作者机构：
[周智勇; 陈建宏; 刘霁] School of Resources and Safety Engineering, Central South University, Changsha 410083, China;[李云; 刘霁] College of Civil Engineering, Hunan City University, Yiyang 413000, China
通讯机构：
School of Resources and Safety Engineering, Central South University, China
作者：
Li Wenbin*;Pan Qinglin;Zou Liang;Liang Wenjie;He Yunbin;...
期刊：
稀有金属(英文版),2009年28(1):102-106 ISSN：1001-0521
通讯作者：
Li Wenbin
作者机构：
[Pan Qinglin; Li Wenbin; Liang Wenjie; Zou Liang; He Yunbin; Liu Junsheng] Cent S Univ, Sch Mat Sci & Engn, Changsha 410083, Hunan, Peoples R China.;[Li Wenbin] Hunan City Univ, Dept Civil Engn, Yiyang 413000, Peoples R China.
通讯机构：
[Li Wenbin] C;Cent S Univ, Sch Mat Sci & Engn, Changsha 410083, Hunan, Peoples R China.
摘要：
Five kinds of Al-Zn-Mg-Cu-Zr based alloys with different Sc additions were prepared by ingot metallurgy. The effects of minor Sc on the microstructure and mechanical properties of Al-Zn-Mg-Cu-Zr based alloys were investigated using tensile tests, optical microscopy (OM), and transmission electron microscopy (TEM). The results show that the ultimate tensile strength and yield strength are improved by 94 and 110 MPa, respectively, and the elongation to failure remains at a reasonable extent (11.1%) in the Al-Zn-Mg-Cu-Zr based alloy with 0.21 wt.% Sc addition after solution heat treatment at 475°C for 40 min and then aged at 120°C for 24 h. The addition of minor Sc induces the formation of Al3(Sc,Zr) particles, which are highly effective in refining the cast microstructures, retarding recrystallization, and pinning dislocations. The increment of strength is attributed mainly to fine grain strengthening, precipitation strengthening of Al3(Sc,Zr) particles, and substructure strengthening.
