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Probabilistic study on ultimate deformation limit of steel frames used in performance evaluation

性能评价中钢框架极限变形极限的概率研究

基本信息

批准号：
15360297
负责人：
ONO Tetsuo
金额：
$ 6.21万
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：
2003
资助国家：
日本
起止时间：
2003 至 2005
项目状态：
已结题

项目摘要

Up to now, Most parts of the structural design used technical terms only understood by structural experts. With the development of performance design, it is the responsibility of designers to clearly explain the performance of the designed structures. Therefore, it is important to express the performance directly using simple and clear physical quantities and quantitative express the uncertainties contained in structures and loads. In the present study, a ultimate limit state reproduction device for structural members is developed and investigated. The device can reproduce the ultimate limit state including fracture, local buckling, bending buckling and lateral buckling. A formulation of resistance and deformation capacity is proposed as a form of design formulation with the parameters of material properties, section shape and stiffness of stiffen materials. Furthermore, the resistance and deformation performance are probabilistically evaluated with consideration of the uncertainties contained in buckling and fracture of steel members and joints. The analysis is conducted using elastic plastic analysis program and the uncertainties in mechanical properties of materials are considered. The results of analysis have good agreements with those obtained from test. The resistance and deformation of the total structures are evaluated considering the affection by the member and joints. Finally, the structural reliability analysis corresponding ultimate limit states are conducted considering the limit deformation and randomness of joints, the relationship between the reliability index and the resistance and deformation capacity is clarified, and the deformation limit and plastic ratio is proposed as the criteria corresponding to the performance limit. The uncertainties corresponding to the deformation requirements and ultimate limit state are clarified in view point of assuring deformation capacity and a database of these uncertainties are constructed.

到目前为止，结构设计中的大部分内容都使用了只有结构专家才能理解的专业术语。随着性能设计的发展，设计者有责任清楚地解释所设计结构的性能。因此，用简单明了的物理量直接表达结构的性能，定量地表达结构和荷载中所包含的不确定性，是十分重要的。本研究开发并研究一种结构构件极限状态再现装置。该装置可以再现包括断裂、局部屈曲、弯曲屈曲和侧向屈曲在内的极限状态。提出了一种以材料性能、截面形状和刚度为参数的抗弯承载力和变形能力设计公式。此外，考虑钢构件和节点屈曲和断裂的不确定性，对节点的抗力和变形性能进行了概率评估。分析采用弹塑性分析程序，并考虑了材料力学性能的不确定性。分析结果与试验结果吻合较好。考虑构件和节点的影响，对结构的抗力和变形进行了评估。最后，考虑节点的极限变形和随机性，对极限状态下的结构可靠度进行了分析，明确了可靠度指标与抗力和变形能力之间的关系，提出了以变形极限和塑性比作为性能极限对应的准则。从保证变形能力的角度，明确了变形要求和极限状态所对应的不确定性，并建立了不确定性数据库。