考虑箍筋约束效应的RC柱性能评价方法研究
Study on performance evaluation method of RC columns considering restraint effect of transverse reinforcement
乔保娟 1肖从真 1杨志勇 1肖岩松1
作者信息
- 1. 中国建筑科学研究院有限公司,北京 100013
- 折叠
摘要
箍筋可以显著提高被约束混凝土的强度和延性,然而目前已有的基于构件变形或基于材料性能的构件性能评价方法均未对箍筋约束效应的影响进行针对性的研究.本文采用基于材料非线性本构的纤维模型,提出了可准确反映箍筋约束效应的基于强度退化系数的混凝土性能评价方法,结合钢筋基于应变的性能评价方法,给出了可考虑箍筋约束效应的钢筋混凝土(RC)柱性能评价方法.通过对不同配箍率、轴压比的RC柱推覆分析,研究了配箍率对RC柱承载力和延性的影响,对比了基于材料性能与基于截面弯矩-曲率关系的RC柱性能评价结果的差异,验证了本文RC柱性能评价方法的合理性,研究成果可为不同配箍率的RC柱抗震性能评价提供参考.
Abstract
Transverse reinforcement can significantly improve the strength and ductility of concrete.However,the existing component performance evaluation methods based on component deformation or material performance have not accurately considered the constraint effect of transverse reinforcement.In this paper,a fiber model based on nonlinear constitutive model of materials is adopted,and a concrete performance evaluation method based on strength degradation coefficient is proposed,which can accurately reflect the constraint effect of transverse reinforcement.Combined with the performance evaluation method of rebar based on strain,an evaluation method of component performance considering restraint effect of transverse reinforcement is given.Through pushover analysis of RC columns with different transverse reinforcement ratios and different axial load ratios,the influence of transverse reinforcement ratios on the bearing capacity and ductility of RC columns is studied.The results of component performance evaluation based on material performance and section moment-curvature relationship are compared,and the rationality of the proposed component performance evaluation method is verified.The research results can provide reference for seismic performance evaluation of RC columns with different transverse reinforcement ratios.
关键词
构件性能评价/箍筋约束效应/混凝土强度退化系数/非线性有限元分析Key words
component performance evaluation/restraint effect of transverse reinforcement/strength degradation coefficient of concrete/nonlinear finite element analysis引用本文复制引用
基金项目
中国建筑科学研究院有限公司青年科研基金(20210122331030008)
北京市自然科学基金资助项目(8212019)
中国建筑科学研究院有限公司"建筑领域数字化技术应用与示范"专项(20220118330730013)
出版年
2024
NETL
NSTL
万方数据