DYNAMIC STABILITY ANALYSIS OF BEAM STRING STRUCTURES UNDER EARTHQUAKE LOADS
DYNAMIC STABILITY ANALYSIS OF BEAM STRING STRUCTURES UNDER EARTHQUAKE LOADS
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DOI：
10.18057/ijasc.2007.3.3.4
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发表时间：
2007
期刊：
影响因子：
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通讯作者：
Q. Han;Chen-Te Ma;Jingyu Zhang
中科院分区：
文献类型：
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作者：
Q. Han;Chen-Te Ma;Jingyu Zhang
摘要：张弦梁结构是由上部构件、下部弦杆和压杆组成的一种新型大跨度混合结构。关于静态行为的研究是广泛的。然而，在动力学领域，特别是动力稳定性方面，还存在一定程度的空白。由于现有的动力稳定性判断标准大多是基于李雅普诺夫动力稳定性理论，而张弦梁结构的地震反应是高度非线性的，因此本文采用非线性有限元分析和时程分析相结合的方法。THD对高非线性结构是有效的。根据位移时程曲线和结构变形，得到了结构动力稳定的临界荷载。从杆数、高跨比、矢跨比、转动惯量、张弦预应力和支座约束方式等方面分析了平面张弦结构在地震作用下的动力稳定性。并与静力稳定性分析结果进行了比较。对工程设计中如何选择合适的结构模型和分析方法提出了建议。
ABSTRACT: Beam String Structure (BSS) is composed of an upper structural member, lower strings and struts, which is a new type of long-span hybrid structure. The study on the static behavior is extensive. However, there is still a certain extent of blank in the field of dynamics, especially the dynamic stability. Owing to the limitation of the existing dynamic stability judgment criterion, most of which are based on Lyapunov dynamic stability theory and the highly nonlinear earthquake response of BSS, the nonlinear finite element analysis and time history method (THD) are adopted. THD is effective to the highly nonlinear structures. Based on the displacement time history curves and structural deformation, the critical load of dynamic stability was obtained. The dynamic stability of the plane BSS is analyzed under earthquake loads in respect of the number of struts, height-span ratio, sag-span ratio, moment of inertia, prestressing force of string and restraint type of supports. The results are compared with those of static stability. Some suggestions are put forward to selecting a proper structural model and analysis in project design.