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Study on Ultimate Behavior of Building with Imbalance Strength due to Yielding or Buckling Subjected to Severe Earthquake

强震作用下屈服屈曲不平衡强度建筑物的极限性能研究

基本信息

批准号：
17560505
负责人：
MORISAKO Kiyotaka
金额：
$ 2.39万
依托单位：
Kyoto Institute of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2005
资助国家：
日本
起止时间：
2005 至 2007
项目状态：
已结题

项目摘要

When a building reaches collapse with a severe earthquake, it is often that the building finally produces deformation accompanied with torsion. In a current structural design, the possibility of torsion behavior to be occurred by eccentricity of mass and stiffness is considered. On the other hand, torsion behavior may be induced by imbalance of strength caused by yielding or buckling. At first, dynamic behavior of spatial steel frame whose braces are buckled subjected to severe earthquake is numerically investigated in this study. Even if brace of a certain plane of structure buckled, that of other plane did sequentially and immediately, and therefore the torsion behavior was hardly observed.Next static and dynamic behaviors of spatial steel frame without brace are analyzed numerically. In static push-over analysis, it is shown that a formation of collapse mechanism in a certain plane of structure induce a twisting behavior of overall frame. However, if the stiffness of horizontal plane of floor is ensured sufficiently, such a difficult situation is not caused. In dynamic analysis, it is illustrated that the effect of inertia produces good results, unless spatial frame is originally imbalance.Therefore it is not necessary to be concerned that severe torsion behavior may be induced by imbalance of strength caused by yielding or buckling in the building structure with good balance of mass and stiffness originally.

当建筑物因强烈地震而倒塌时，往往最终会产生伴随扭转的变形。在当前的结构设计中，考虑了由于质量和刚度的偏心而发生扭转行为的可能性。另一方面，扭转行为可能是由屈服或屈曲引起的强度不平衡引起的。首先，本研究对支撑屈曲的空间钢框架在强烈地震作用下的动力行为进行了数值研究。即使结构的某个平面的支撑发生屈曲，其他平面的支撑也会相继发生、立即发生，因此很难观察到扭转行为。接下来对无支撑的空间钢框架的静态和动态行为进行了数值分析。静力推覆分析表明，结构某一平面内塌陷机制的形成会引起整体框架的扭转行为。然而，如果充分保证地板水平面的刚度，则不会造成这种困难的情况。在动力分析中，表明除非空间框架本身不平衡，否则惯性效应会产生良好的结果。因此，不必担心原本质量和刚度平衡良好的建筑结构因屈服或屈曲而导致强度不平衡而引起严重的扭转行为。