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Probabilistic Evaluation of Column Over-Design Factore for Fram Structures

框架结构柱超设计因素的概率评估

基本信息

批准号：
10555199
负责人：
ONO Tetsuro
金额：
$ 3.52万
依托单位：
Nagoya Institute of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B).
财政年份：
1998
资助国家：
日本
起止时间：
1998 至 2000
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-10555199/
关键词：
frame structures entire failure pattern stochastic limit analysis column over-design factor target COF reliability based design

项目摘要

In the earthquake resistance design of frame structures, the mode in entire failure pattern, which allows the yielding of all the beams in flexure prior to possible yielding of columns, is generally considered to be a preferable mode. Structures are therefore generally weak-beam-strong-column designed with a column over-design factor. In reality however, the designed weak-beam-strong-column structures may not collapse according to the preferable failure mode because of the large uncertainties in the external loads and the member strengths. These uncertainties may change the column over-design factor (COF) and the structure may collapse according to some unpreferable failure modes such as the weak story mechanisms. The object of this study is probabilistic evaluation of the target values of column over-design factors for which the occurrence probability of unpreferable failure modes can be limited to within a specific tolerance. A stochastic limit analysis procedure using the Linear Programing method and the First Order Reliability Method is developed, and the likely failure modes of weak-beam-strong-column designed structures are investigated using this procedure. The target value of column over-design factor is discussed in probabilistic terms. It is found that a much higher value of column over-design factor is required in the case of uncertain loads and member strengths than is expected in deterministic cases.

在框架结构抗震设计中，一般认为允许所有受弯梁在柱可能屈服之前屈服的整体破坏模式是较好的抗震设计模式。因此，结构通常采用弱梁-强柱设计，并考虑柱的过度设计因素。但在现实中，由于外荷载和构件强度存在较大的不确定性，所设计的弱梁强柱结构可能不会按照优选的破坏模式发生垮塌。这些不确定性会改变柱超设计系数（COF），使结构按弱层结构等不良破坏模式发生破坏。本研究的目的是对柱过度设计因素的目标值进行概率评估，其中不良破坏模式的发生概率可以限制在特定的公差范围内。采用线性规划法和一阶可靠度法建立了随机极限分析程序，并利用该程序研究了弱梁强柱设计结构的可能破坏模式。从概率的角度讨论了柱过设计系数的目标值。研究发现，在荷载和构件强度不确定的情况下，柱的超设计系数比确定情况下的预期值要高得多。