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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235～420 MPa、混凝土强度为30～90 MPa范围内,理论计算结果和试验结果吻合较好。
To study the seismic behavior of CFST frame, the load-displacement hysteretic relationship of CFST column-steel beam plane frame is calculated. Taking into account the material and geometric nonlinearity, a numerical calculation model is established on the OpenSees solution platform based on the nonlinear fiber beam-column element theory. The stress-strain relationship of the core concrete takes the constraint effect of the steel pipe into consideration; the stress-strain relationship of the steel adopts the bilinear strengthening model. The results show that the calculated results agree well with the experimental results when the strength of steel is 235 ~ 420 MPa and the strength of concrete is 30 ~ 90 MPa.