Numerical and experimental study on seismic behavior of concrete-filled T-section steel tubular columns and steel beam planar frames

Abstract

The seismic behavior of planar frames with concrete-filled T-section columns to steel beam was experimentally and numerically studied. A finite element analysis (FEA) model was developed to investigate the engineering properties of the planar frames. Two 1:2.5 reduced-scale specimens of T-section concrete-filled steel tubular column and steel beam of single-story and single-bay plane frames were designed and fabricated based on the design principles of strong-column, weak-beam and stronger-joint. One three-dimensional entity model of the investigated frame structure was built using a large-scale nonlinear finite-element analysis software ABAQUS. Experimental results show that the axial compression ratio has no effect on the failure mode of the structure, while with the increase of axial compression ratio and the dissipated energy ability increasing, the structural ductility decreased. The results from both experiments and simulations agree with each other, which verifies the validity and accuracy of the developed finite element model. Furthermore, the developed finite element model helps to reflect the detailed stress status of the investigated frame at different time and different positions.

摘要

通过试验和数值模拟研究了T 形钢管混凝土柱–钢梁平面框架的抗震性能, 并开发了一种有限 元分析模型用于研究平面框架的工程特性。基于强柱弱梁和强节点的设计原则, 设计并制作了两榀 1:2.5 缩尺比例的T 形钢管混凝土柱–钢梁平面框架, 利用大型非线性有限元分析软件ABAQUS 建立 了所研究框架结构的三维实体模型。试验结果表明, 轴压比对结构的破坏模式没有影响, 随着轴压比 的增大和耗能能力的提高, 结构延性下降。试验结果与数值模拟结果一致, 验证了开发的有限元模型 的有效性与准确性。此外, 开发的有限元模型有助于反映该平面框架在不同时间、不同位置的详细应 力状态。