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.

在极限状态设计的实践方面的发展中，有很多关于荷载和结构阻力的问题需要解决。本研究重点研究（1）钢结构构件的极限状态评估，（2）地震和强风的动力响应，（3）荷载组合模型。借助现有的实验结果来评估局部屈曲和欧拉屈曲项，并将其重新整理成以长细比和宽厚比为主要参数的数据库形式。为了有效利用极限状态设计，应进一步继续这种努力。通过建立摇摆扭转振动的分析模型来进行机翼响应研究。具有指定相关性的模拟机翼载荷波动用于数值响应分析。地震响应研究由两部分组成，一是对记录的比例结构响应进行分析，以揭示钢结构的倒塌过程；二是对高层建筑的结构行为进行统计评估，以计算第二层的地震安全性。力矩可靠性。荷载组合模型是极限状态设计的重要组成部分之一。平交率方法是针对随时间变化的荷载组合而开发的，然后以数值方式获得荷载系数作为建议的模型。对对数正态随机变量的求和提供了一个简单的荷载组合示例。最后讨论了极限状态设计的定义，以增加进一步开发的合理性。还总结了未来的一些问题，重点是负荷概率模型的改进和目标可靠性的理论基础。