低架桥桁架结构在地震作用下的动力稳定性分析

Nonlinear dynamic stability analysis on low bridge-truss under seismic loading for automated container terminals

低架桥空间桁架结构作为自动化码头运输环节中关键的一环,其在地震作用下的动力稳定性至关重要.考虑了材料非线性和几何非线性的双重非线性影响,使用基于B-R(Budianshky-Roth)运动准则的动态增量法分析了低架桥空间桁架结构在地震作用下的动力稳定性,得到了低架桥空间桁架结构动力失稳的临界载荷范围,并通过讨论指出,使用基于B-R运动准则的动态增量法在研究类似的具有稳定后屈曲路径结构的动力稳定性问题时,应当抛弃动力分叉的概念,而将重点放在把临界载荷确定在工程可以接受的范围内.

As a critical transport component of automated container terminals,the dynamic stability of 3-dimensional structure of low bridge-truss secures a crucial position under the seismic loading.By considering the material and geometric nonlinearities,the incremental dynamic analysis（IDA）method based on B-R kinematical criteria is frequently applied to resolve such problems as bucking path structure upon completion of stability.Therein,the notion of limiting the critical loading into an accepted engineering scope,rather than dynamic overlapping,should not be adopted.