Seismic Torsional Effects In Multistory Buildings

这项研究是一项联合合作研究， 学术研究与 单位和专业设计事务所， 研究地震扭转效应， 多层建筑 两个项目（BCS 9020394和BCS 9116089）合并为 联合合作研究 作为一项研究工作。 通过分析模型和 概率方法，这项研究 评估非弹性地震反应， 扭转不平衡结构， 发展更合理方法的观点 设计。 地震知识 响应，针对地震运动计算 由归一化的真实的和 合成加速度图，用于获得 身体的洞察力在广泛的检查 一系列基于弹性的手术， 用于扭转效应的现行规范 在抗震设计中。 这些的有效性 评估程序的方法是首先设计 结构模型根据 基于弹性的“静态”和模态 叠加规则，然后是一个显式的 这些非弹性响应的评价 模型 扭转不平衡结构 会被判定为设计合理 如果地震发生的概率 反应参数（层间位移或构件 延展性要求）不超过 对称（symmetric） 系统 建立标准将有助于 查明现行做法中不足之处， 将提供一种测试方法， 系统地修改不同的设计 规则，直到满意的概率 得到了 该项目的结果提供 关于扭转的重要数据 在多层建筑物中， 地震力

This research study is a joint collaborative research effort between an academic research unit and a professional design office to investigate seismic torsional effects in multistory buildings. Two projects (BCS 9020394 and BCS 9116089) are combined into a joint cooperative study of the referenced topic area as a single research effort. By means of analytical models and a probabilistic approach, this research study evaluates the inelastic seismic response of torsionally unbalanced structures, with a view towards developing more rational methods of design. Knowledge of the seismic response, calculated for seismic motions defined by ensembles of normalized real and synthetic accelerograms, are used to gain physical insight in the examination of a wide range of elastically-based procedures widely used in current codes for torsional effects in seismic design. The validity of these procedures are assessed by first designing the structural models according to the elastically-based "static" and modal superposition rules, followed by an explicit evaluation of the inelastic response of these models. A torsionally unbalanced structure will be judged to have been properly designed if the probability of exceedance of a seismic response parameter (story drift or component ductility demand) does not exceed that for the corresponding balanced (symmetric) system. Criterion established will help identify deficiencies in current practice and will provide a method for testing and modifying systematically different design rules until satisfactory probabilities are obtained. Results from this project provide critically important data on the torsional effects in multistory buildings induced by seismic forces.