[Zhou, Xianyan] School of Civil, Architectural and Mechanics, Central South University of Forestry and Technology, Changsha, 410004, China;[He, Ran; Cao, Guohui; Liu, Xiangrong] School of Civil Engineering, Hunan City University, Yiyang, 413000, China
9th International Conference of Chinese Transportation Professionals, ICCTP 2009: Critical Issues in Transportation System Planning, Development, and Management
August 5, 2009 - August 9, 2009
(1) School of Civil, Architectural and Mechanics, Central South University of Forestry and Technology, Changsha, 410004, China; (2) School of Civil Engineering, Hunan City University, Yiyang, 413000, China
Jianzhu Jiegou Xuebao/Journal of Building Structures,2007年28(SUPPL.):41-50 ISSN：1000-6869
[Wang, Haibo; Cao, Guohui; Chen, Bowang] Civil Engineering College, Hunan City University, Yiyang 413000, China
The pseudo-dynamic test of the model CFST tube structure has been conducted. The CFST tube structure model with 13 floors and a scale of 1:10 consists of an outer-tube and an inner-tube. The former is a framed tube supported on CFST frames and the latter is an RC tube. A series of pseudo-dynamic tests on acceleration earthquake waves in four cases (0.22g, 0.4g, 0.62g and 1.0g) have been fulfilled by taking the model as two degrees of freedom system. The energy dissipation, failure mechanism and elasto-plastic behavior of model are studied under earthquake by testing the factors, such as displacement time-history cure, force time-history cure, strain state and cracking state. The experiment shows that the core-tube bears a greater part of the shear force and cracks earlier than other elements, but the failure of the 2nd floor is more serious than the ground floor. Because of concentrate force and obvious failure, great attention has to be paid to the design of connecting beam's ductility. As for higher strength and superior deformation property, CFST columns bear the main axial force of outer framed-tube and protect other RC columns of flag frame. The ring joint of CFST column and RC beam is rather reliable by bearing flex force in node zone. The experiment has illustrated that the CFST tube structure is an outstanding structural style with excellent seismic behavior.
[Cao Guo-hui] Hunan City Univ, Coll Civil Engn, Yiyang 413000, Peoples R China.
PC box girders;long-term load experiment;flexural behaviors;cracks;static performance
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.
[Liu, Xiao-Fang; Cao, Guo-Hui; Liu, Xiang-Rong; He, Ran] Hunan City Univ, Sch Civil Engn, Yiyang 413000, Peoples R China.
4th International Symposium on Lifetime Engineering of Civil Infrastructure
OCT 26-28, 2009
Changsha, PEOPLES R CHINA
[Cao, Guo-Hui;He, Ran;Liu, Xiao-Fang;Liu, Xiang-Rong] Hunan City Univ, Sch Civil Engn, Yiyang 413000, Peoples R China.
Concrete columns;creep;ultimate strength
Long-term mechanical properties test for 864 days were completed on three types column, including plain concrete(PC), reinforced concrete(RC) and concrete-filled steel tube(CFST) columns, the creep performance and ultimate strength were tested and analyzed. Creep test results show that reinforcement can significantly reduce the creep deformation of concrete columns. The creep coefficient of steel pipe surface is larger than that of inner concrete for CFST columns, it would last a long time for the creep of inner concrete to achieve stability. The ultimate strength test results show that loading age and reinforcement have great effect on extreme compression strain and ultimate strength of PC columns and RC columns. Whether it has loading course would influence the stress redistribution of CFST columns, the stress redistribution effect is relatively small for columns having loading course. However, whether it has loading course, the creep effect on the ultimate strength of CFST columns is very small.
[Heran; Song Jianyi; Cao Guohui] Hunan City Univ, Yiyang 413000, Peoples R China.;[Xie Zhenyu] Changsha Urban Res Inst Construct Sci, Changsh 410011, Peoples R China.
4th International Conference on Technology of Architecture and Structure, ICTAS 2011
September 22, 2011 - September 24, 2011
(1) Hunan City University, Yiyang 413000, China; (2) Changsha Urban Research Institute of Construction Science, Changsha 410011, China
Advanced Materials Research
T shape steel beam bridge;load transverse distribution;experimental study
Diaphragm beam has grate influence to load transverse distribution factors of T-beam bridge. Two steel T-beam bridge models were made in this article, one have diaphragm beam and the other one have not. Concentrated load was applied to both of them, and mechanical analysis of the T-beam bridge model was carried out by finite element software. Compared with experiment data and theoretical data, it shows that: when the concentrated load was applied to mid-span of 1#,2# and 3# beam of the two kind bridges, the 1#,2# and 3# beam load transverse distribution factors of T-beam bridge without diaphragm beam is larger than that of T-beam bridge with diaphragm beam by 19.3%similar to 23.2%, 25.3%similar to 30.6% and 48.1%similar to 50.1% respectively.