多联连续梁桥横桥向多模态推倒分析方法

Modal Pushover Analysis Method in Transverse Direction of Multi span Continuous Bridges

摘要:

研究多联连续梁桥横桥向的多模态推倒分析（MPA）方法，用于初步设计阶段的抗震性能评估,并进一步对比分析了Luca折线简化方法与FEMA356中折线简化方法应用于多模态推倒分析方法中的效果.以某三联主线桥为研究对象，进行多模态推倒分析和非线性动力时程分析.结果表明：多模态推倒分析方法可以对多联连续梁桥的抗震性能做出有效评估，Luca折线简化方法与FEMA356中的折线简化方法相比优越性不明显.

Abstract:

Modal pushover analysis method in transverse direction of multi span continuous bridges is studied for seismic performance evaluation of bridges in preliminary design stage. Moreover, effects of near optimal piecewise linear fits and FEMA356 fits in modal pushover analyses are compared. Modal pushover analyses with the two fits and nonlinear time history analysis of 3 continuous units of a constructing bridge are conducted. The conclusions are drawn that the modal pushover analysis method reasonably predicts the seismic performance of multi span continuous bridges; no obvious advantages of near optimal piecewise linear fits are shown in comparison with FEMA356 fits.