【摘要】 为研究钢管混凝土框架抗震性能,进行了钢管混凝土柱-钢梁平面框架往复加载时荷载-位移滞回关系的计算。考虑了材料和几何非线性,基于非线性纤维梁-柱单元理论,在OpenSees求解平台上,建立了数值计算模型。核心混凝土的应力-应变关系考虑了钢管约束效应;钢材的应力-应变关系采用双线性强化模型。结果表明:在钢材强度为235~420MPa、混凝土强度为30~90MPa范围内,理论计算结果和试验结果吻合较好。更多还原

【Abstract】 The hysteresis relationship in concrete-filled steel tubular(CFST) frames during seismic loads was analyzed for composite frames having CFST columns and H-shape steel beams.The model was based on fiber nonlinear beam-column element theory and the OpenSees Software,nonlinear material and geometric conditions to simulate the hysteresis to the reverse lateral loading versus the lateral displacement.The stress-strain relationship of the confined core concrete was considered,with a bilinear stress-strain model with strain hardening for the steel.The numerical results agree well with experimental results with steel yield strength of 235-420 MPa and concrete cube compression strength of 30-90 MPa.更多还原