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以一局部平面不规则的RC框架结构为研究对象,基于OpenSees有限元分析软件,采用均匀加载、倒三角加载、抛物线加载和按第一振型分布加载4种侧向加载模式,对结构沿横向进行静力弹塑性推覆分析,依次求解结构在这4种侧向加载模式下从多遇、设防到罕遇地震下的性能点顶点位移和基底剪力。然后研究了两榀框架二维Pushover分析与整体结构的三维Pushover分析结果的异同,并就各性能点处的楼层位移和层间位移角进行对比和分析。结果表明:均匀分布模式结果偏差较大,不适用,倒三角分布加载模式在三维模型Pushover分析中具有较好的适用性。二维模型分析的性能点顶点位移偏小,与三维模型分析结果的差值随着地震强度提高而增大,三维模型能更好体现结构薄弱层所处位置,简化的平面分析结果偏于危险。
Based on the finite-element analysis software OpenSees, four kinds of lateral loading modes with uniform loading, inverted triangular loading, parabola loading and first-vibration mode loading were used to study the structure of RC frame with partially local irregularities. The static elasto-plastic nappe analysis is carried out, and the displacement and the base shear of the performance point under the four kinds of lateral loading modes from multiple encountering, fortification to rare earthquakes are sequentially solved. Then the similarities and differences between two-dimensional Pushover analysis of two-frame and three-dimensional Pushover analysis of the whole structure are studied, and the comparison between floor displacement and layer displacement angle at each performance point is carried out. The results show that the results of uniform distribution have great deviation and are not suitable. The inverted triangular distribution loading mode has good applicability in Pushover analysis of three-dimensional model. The displacement of the two-dimensional model of the performance point is small, and the difference with the three-dimensional model analysis results increases with the increase of the earthquake intensity. The three-dimensional model can better reflect the position of the structural weak layer, simplifying the plane analysis results to the danger .