RC框架结构pushover方法顶点位移的敏感性分析

Sensitivity Analysis of the Top Displacement of the Pushover Analysis Method of Reinforced Concrete Frame Structure

以8层钢筋混凝土平面框架结构为例,采用一次二阶矩法、Tornado图形法和数理统计方法研究了pushover分析顶点位移对地震烈度、场地特征、侧向荷载加载模式、结构重量、混凝土强度和弹性模量、钢筋强度和弹性模量等不确定性因素的敏感性.研究表明,pushover分析方法中顶点位移对地震需求曲线的敏感性远远强于对能力曲线的敏感性,因此,在研究概率pushover分析方法时,仅考虑需求曲线的不确定性,忽略能力曲线的不确定性,可大大简化分析复杂程度,并且仍然可以保证分析结果的精度.

Based on a 8-story reinforced concrete plane frame structure, The FOSM method, the torna-do diagram method and the mathematical statistics method were used to discuss the sensitivity of the top displacement to uncertainties such as the seismic intensity, the site characterization, the lateral load load-ing mode, the structural weight, the strength and elastic modulus of concrete and the strength and elastic modulus of the rebar. The results show that the sensitivity of the top displacement to the demand curve is much stronger than the capacity curve. Accordingly, considering the uncertainty of the demand curve and ignoring the uncertainty of capacity curve when studying the pushover analysis method based on the proba-bility theory can not only greatly simplify the analysis procedure but also ensure the accuracy of the re-sults.