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基于已有试验研究,采用有限元软件Open Sees,模拟了低周反复荷载作用下L形钢管混凝土柱-钢梁框架的荷载-位移曲线,并对其受力特性的影响参数进行了分析。结果表明:柱截面宽厚比D/t主要影响结构的刚度,D/t在30~70范围内时,D/t越大,加载初期结构刚度越大,后期刚度退化也越快,而柱截面长宽比D/B对结构的影响与之相反;核心混凝土抗压强度和钢材屈服强度越低,峰值荷载后,曲线下降段越平缓,结构表现出更好的延性;轴压比n对结构荷载-位移曲线有较大影响,轴压比越大,曲线上升和下降段越陡,而梁柱线刚度比对荷载-位移曲线上升段影响明显;水平荷载作用方向对荷载-位移曲线形状影响不明显。
Based on the existing experimental research, the finite element software Open Sees was used to simulate the load-displacement curve of L-shaped CFST-steel beam frame with low-cycle repeated loading. The influence parameters of the L-shaped CFST-steel beam were analyzed. The results show that the stiffness ratio of D / t mainly affects the stiffness of the structure. When the D / t is in the range of 30-70, the greater the D / t is, the greater the initial structural stiffness is and the later the stiffness degradation is faster. The aspect ratio D / B has the opposite effect on the structure. The lower the compressive strength of core concrete and the yield strength of steel, the more gentle the descending section of the curve after peak load, the better the ductility of the structure; Load-displacement curve has a greater impact, the greater the axial compression ratio, the steeper the curve rise and descent, while the beam-column stiffness ratio significantly affected the load-displacement curve of the rising section; horizontal load direction of load-displacement curve shape Not obvious.