论文部分内容阅读
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。
In order to study longitudinal buckling of reinforced concrete columns under earthquake and its influencing factors, a simplified calculation model of longitudinal buckling length considering the nonlinearity of reinforcing bars is proposed based on the principle of minimum energy. The reliability of the simplified buckling model was verified by 73 rectangular RC columns with different reinforcing forms and compared with the simplified calculation model (D & M model) proposed by Dhakal and Maekawa. The results show that the longitudinal reinforcement enters non-linearity when buckling, and the error of analysis shows that the initial elastic modulus of longitudinal reinforcement is 0.025 times of that of the longitudinal reinforcement. The lateral restraint of the longitudinal reinforcement by the stirrup can be simplified as the linear spring, The section area of the reinforcement and the form of the bail. The simplified calculation model can predict the longitudinal buckling length better and the prediction result is obviously better than the D & M model.