权益分类	功能权益	普通用户	{{item.name}}会员
{{category.name}}	{{benefitItem.name}}

EVALUATION OF LOADS AND STRUCTURAL RESISTANCES IN THE LIMIT STATE DESIGN

极限状态设计中载荷和结构阻力的评估

基本信息

批准号：
01302047
负责人：
KANDA Jun
金额：
$ 6.66万
依托单位：
Dept.of Architecture, Faculty of Engineering, The University of Tokyo
依托单位国家：
日本
项目类别：
Grant-in-Aid for Co-operative Research (A)
财政年份：
1989
资助国家：
日本
起止时间：
1989 至 1991
项目状态：
已结题

项目摘要

In the development of practical aspects of the limit state design, quite a few problems for the load and the structural resistance are to be solved. In this study, (1) the evaluation of limit state for members in steel structure, (2) the dynamic response for both the earthquake and the strong wind, (3) the load combination model are focused to be investigated.The limit state in terms of local buckling and Euler buckling is evaluated with aids of existing experimental results, which are also rearranged in a form of data base with slenderness ratio and width-thickness ratio as major parameters. Such efforts should be continued further for effective uses of the limit state design.Wing response studies are conducted by establishing an analytical model for the sway-torsional vibration. Simulated wing load fluctuations with a specified correlation are used for numerical response analyzes. Seismic response studies consist of two parts, one is the analysis of recorded responses of scaled structure to reveal the collapse process of steel structure and the other is the statistical evaluation of structural behavior for high rise buildings to compute the seismic safety in terms of the second moment reliability.The load combination model is one of important parts of the limit state design. Level crossing rate approaches are developed for combinations of time varying loads, then load factors are numerically obtained as a proposed model. The summation of log-normal random variables is treated to provide a simple load combination example.Finally the definition of limit state design is discussed to increase the rationality of further development. A few future problems are also summarized with an emphasis on the improvement of the probabilistic model of load and the theoretical basis for the target reliability.

在极限状态设计实用化方面的发展中，有相当多的荷载和结构抗力问题有待解决。本研究针对钢结构构件的极限状态评估、地震及强风作用下的动力反应、荷载组合模式等问题，结合已有的试验结果，对局部屈曲和欧拉屈曲极限状态进行了评估。并以细长比和宽厚比为主要参数，以数据库的形式重新排列。为了有效地利用极限状态设计，应继续进行这种努力。通过建立摇摆-扭转振动分析模型，进行了机翼响应研究。具有指定相关性的模拟机翼载荷波动用于数值响应分析。地震反应研究包括两个方面，一是对缩尺结构的地震反应进行分析，以揭示钢结构的倒塌过程;二是对高层建筑结构性能进行统计评估，以二阶矩可靠度计算结构的地震安全性，荷载组合模型是极限状态设计的重要组成部分。针对时变荷载组合，提出了水平交叉率法，并以数值计算的方法得到了荷载系数。对对数正态随机变量的求和进行了处理，给出了一个简单的荷载组合算例，最后对极限状态设计的定义进行了讨论，以增加进一步发展的合理性。最后对今后的研究方向进行了总结，重点是负荷概率模型的改进和目标可靠度的理论基础。