摘要
为研究钢筋混凝土柱在地震作用下的纵筋屈曲及影响因素,该文基于最小能量原理,提出了考虑钢筋非线性的纵筋屈曲长度简化计算模型。采用不同配筋形式的73个矩形钢筋混凝土柱,验证简化屈曲模型的可靠性,并与Dhakal和Maekawa提出的简化计算模型(D&M模型)进行对比分析。结果表明:屈曲时纵筋进入非线性,通过误差分析,纵筋等效弹性模量取0.025倍钢筋初始弹性模量;箍筋对纵筋的侧向约束可简化为线性弹簧,弹簧刚度与箍筋截面面积及配箍形式有关;简化计算模型可以较好地预测纵筋屈曲长度,预测结果明显优于D&M模型。
To investigate reinforcement buckling and influential factors of reinforced concrete （RC） columns under seismic loading, a simplified calculation model of longitudinal bar buckling length considering the nonlinearity of reinforcing bar is proposed based on minimal energy principle. Seventy three rectangular RC columns with different reinforcement layouts are adopted to verify the reliability of simplified buckling model. The simplified calculation model is compared with the model proposed by Dhakal and Maekawa （D＆M model）. The results indicate that, the longitudinal bar will be in nonlinear period during buckling, and the equivalent elastic modulus of longitudinal bar is 0.025 times the initial elastic modulus of steel through error analysis. The lateral confinement of stirrups on longitudinal bars can be simplified as linear springs, stiffness of which is related with the cross section area and stirrups layouts. Simplified calculation model can predict the buckling length of longitudinal bars with good precision, which is better than D＆M model.
出处
《工程力学》
EI
CSCD
北大核心
2017年第2期162-170,共9页
Engineering Mechanics
基金
贵州省"十二五"重大科技专项项目([2011]6014)
国家"九七三"重点基础研究发展计划项目(2013CB036305)
国家自然科学基金项目(51438010
51278373
51408195)
关键词
钢筋混凝土柱
屈曲长度
简化计算模型
抗震性能
钢筋屈曲
reinforced concrete columns
buckling length
simplified calculation model
seismic performance
reinforcement buckling
