摘要
采用纤维模型梁柱单元和与之串联的零长度单元,模拟柱的弯曲机制和剪切机制。利用OpenSees提供的Limit State Material和Shear Limit Curve材料模型,定义钢筋混凝土柱的非线性剪切效应及其与弯曲效应的耦合。通过与不同学者的试验结果比较,验证了该方法的可靠性。最后,对笔者完成的原位推覆试验的一榀平面框架进行了Pushover分析。结果表明,考虑非线性剪切效应的模型化方法能较好地模拟钢筋混凝土柱抗剪承载力和刚度的退化现象,传统的纤维模型梁柱单元难以反映配箍不足的钢筋混凝土柱的弯剪破坏机制。该方法可用于存在抗剪能力缺陷的框架结构的非线性分析。
A fiber beam-column element in conjunction with zero-length elements attached to its ends was proposed to simulate the flexural and shear mechanism respectively.Based on the Limit State Material model and the Shear Limit Curve model provided by OpenSees,the nonlinear shear effect of reinforced concrete column and its coupling with the flexural effect were defined.The reliability of the proposed model was validated by means of comparisons with existing test results.Finally,a plane frame from in-situ pushover test was simulated.It is shown that the proposed method,by taking the nonlinear shear effect into account,produces satisfactory results for frame columns with shear strength and stiffness degradation,while the conventional fiber beam-column element can hardly simulate actual flexure-shear failure mechanism for columns characterized by insufficient transverse reinforcement.The proposed method is applicable for nonlinear analysis of reinforced concrete frame structures with shear deficiencies.
出处
《土木建筑与环境工程》
CSCD
北大核心
2013年第4期13-19,共7页
Journal of Civil,Architectural & Environment Engineering
基金
国家自然科学基金(51078037)
教育部高校博士点基金(20100205110010)
中国博士后科学基金(2012M511957)
关键词
钢筋混凝土
柱
非线性
弯剪破坏
reinforced concrete
column
nonlinear
flexure-shear failure
