Optimum Constitution of Ulitimate Limit State Function for Earthquake Resistant Design of Steel Frames Based on Response Test Data and Observation Record

研究了抗震结构极限状态函数的最优构成。作为研究的基础，建立了钢框架模型地震反应试验数据库，其中包含了约100个试验结果。利用数据库研究了双线性分析模型的响应预测误差。发现永久位移等响应结果对模态参数比较敏感，不宜将其作为构成抗震结构最优极限状态函数的因素。另一方面，可以从工程角度对结构的能量吸收和最大位移进行预测。进行了一项历史调查。结果表明，结构工程专家将抗力劣化作为判断钢框架损伤程度的最重要标准。在钢架试验中观察到的损坏程度根据抗力退化的程度分为4个等级：“不，早期，相当程度的退化。”和“彻底崩溃”。应变能与线弹性响应相同的假设在一定程度上提供了对损伤程度的实用预测。

The optimum constitution of limit state function of earthquake resistant structures is researched.1.As a foundation of the research, a database of earthquake response tests on steel frame models has been established, in which about 100 tests results are included.2.The errors of response prediction by the bi-linear analysis model were studied in terms of the database. It is found that some response result such as permanent displacement is sensitive to the modal parameters, so it will not be suitable to select such a response result as the factor to constitute the optimum limit state function of earthquake resistance structures. On the other hand, the energy absorption and the maximum displacement can be predicted in view of engineering.3.An anquete investigation was carried out. The results show that the experts in structural engineering take the resistance deterioration as the most important criteria to judge the damage degree of steel frames.4.The damage degrees observed in tests on steel frames are classified into 4 degrees according to the amount of the resistance deterioration : 'No, Early, Considerable Deterioration.' and 'Complete Collapse.' The hypothesis of identical strain energy with linear-elastic response provides a practical prediction of damage degree to some extent.