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植筋梁中植筋端头加设箍筋对梁受力性能的影响
阎西康1,2, 梁琛1, 梁琳霄1, 庞玉松1
1.河北工业大学 土木与交通学院, 天津 300401;2.河北工业大学 河北省土木工程技术研究中心, 天津 300401
摘要:
为研究植筋梁中植筋端头加设箍筋对梁受力性能的影响,对3根植筋深度为20D、25D、30DD为植筋的直径)的植筋端头未加设箍筋的植筋梁进行静载试验,对3根植筋深度为20D、25D、30D的未加设箍筋的植筋梁和3根植筋深度为20D、25D、30D的加设箍筋的植筋梁进行循环荷载试验,并用ANSYS模拟植筋深度为20D、25D、30D的植筋梁进行静力受弯力学性能的模拟分析,绘制跨中荷载挠度曲线,研究植筋随荷载的应力变化,进而反映有无加设箍筋对梁受力性能的影响,并整理了植筋端头加设箍筋的端头应变和未加设箍筋植筋端头应变的关系。循环荷载试验及有限元分析表明:在植筋端头加设箍筋可以缓解植筋端头应力集中现象,并提高植筋梁的延性、开裂荷载、极限荷载,降低了植筋应变、残余变形。
关键词:  箍筋  有限元分析  混凝土梁  受力性能
DOI:10.11835/j.issn.1674-4764.2018.06.016
分类号:TU375.1
基金项目:河北省住房和城乡建设厅项目(2014-124)
Effect of reinforcing stirrups on the mechanical performances of reinforcing bar at ends
Yan Xikang1,2, Liang Chen1, Liang Linxiao1, Pang Yusong1
1.School of Civil and Transportation Engineering, Hebei University of Technology, Tianjin 300401, P. R. China;2.Development Research Center of Civil Engineering of Hebei Province, Hebei University of Technology, Tianjin 300401, P. R. China
Abstract:
In order to study the beam end anchorage bar with effect of stirrups on the structural behavior of beams, static loading tests were carried out for three root anchorage depths of 20D, 25D, 30D, respectively from the anchorage end without a stirrup anchorage beam. ANSYS finite element simulations for anchorage depths of 20D, 25D, 30D of the anchorage beam were also conducted to investigate the flexural mechanical properties, the drawing span load deflection curves, the bar with load stress changes. It is found that the reaction has no additional effect on the beam stirrups. The cyclic loading tests and FE simulations show the addition of stirrups at the end of the anchorage can alleviate the concentration and improve the general ductility, anchorage beam cracking load, ultimate load stress of anchorage end, and reduce the reinforcement strain, as well as the residual deformation.
Key words:  stirrup  finite element analysis  concrete beam  mechanical behavior
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