节点区柱钢管不贯通式钢管混凝土柱-梁节点传力机理研究

Force transference mechanism of concrete filled steel tubular column-beam joints with discontinuous column tubes

为研究节点区柱钢管不贯通式钢管混凝土柱-梁节点的传力机理,文章采用基于纤维模型的有限元软件SeismoStruct开展数值模拟分析,建立了该种新型钢管混凝土柱-梁节点的三维简化模型,模拟节点低周反复荷载作用下滞回曲线并与试验结果进行对比,结果表明,数值模拟分析结果与节点低周反复荷载试验结果拟合良好.在验证简化节点模型正确性的基础上,对框架梁的弯矩分布、环梁的扭矩与弯矩分布进行研究,总结了节点区钢管不贯通式环梁节点的弯矩传导机理.研究表明,该新型节点的弯矩传导主要集中在框架梁轴方向,传力机制较节点区钢管贯通的节点型式直接、有效.

In order to study the force transference mechanism of concrete filled steel tubular column-beam joint with discontinuous column tubes,the fiber-model based finite element program SeismoStruct is used to conduct numerical simulation analysis.A three-dimensional simplified model of the new-type concrete filled steel tubular column-beam joint is proposed and simulation analysis is compared with tests under cyclic loading.Numerical results are in good agreement with experimental results.Base on the verification of the simplified model,further studies on the moment distribution of the frame beam,torque and moment distribution of the ring beam is carried out,then moment transmission mechanism of the new-type concrete filled steel tubular column-beam joint is summarized.Results show that moment of frame beam is mainly transferred along the direction of frame beam,and the force transference is more directly and effectively compared with that of normal CFST column-beam joints.