基于能量平衡的桥梁结构抗震性能分析

基于能量平衡的静力弹塑性方法是将能量平衡的概念引入到Pushover方法中,对结构进行抗震性能评价的新方法。该方法在建筑领域已有一定的应用,但是在桥梁领域相关的研究仍比较缺乏。利用该方法对三条典型地震动作用下桥梁的桥墩进行基于能量平衡的推覆分析,并将计算结果同倒三角分布模式、均匀分布模式下的传统Pushover方法以及时程分析的结果进行比较。最后,利用量化性能水准对基于能量平衡的Pushover方法的结果和时程分析的结果进行抗震性能评估。结果表明,基于能量平衡的Pushover方法和非线性时程分析方法所得到的结果更加接近,这两种方法对桥墩破坏程度的评估结果相同,因此,基于能量平衡的Pushover方法能够对桥梁结构进行更有效地抗震性能评估。

Seismic Performance Analysis of Bridge Structure Based on Energy Balance

The static elastic-plastic method based on energy balance is a new method of seismic performance evaluation which introduces the concept of energy balance to the Pushover method .This method has already been used in the con-struction field ,but it is still lack of research in the field of bridge .In this paper ,first the bridge piers are pushed by three typical ground motions .Second ,the results of calculation are compared to two traditional Pushover methods using linear distribution ,the uniform distribution and nonlinear dynamic response analysis .Last ,quantified performance levels are used to evaluate the seismic response of bridge structure .It shows that the results obtained from this method are more similar to the results from the nonlinear dynamic response analysis .The results of damage state estimation of two methods are uniform .Therefore ,Pushover method based on energy balance can be used effectively to estimate the seismic re-sponse of bridge structure .