Drift Response of Reinforced Concrete Flat-Plate Structures During Loma Prieta Earthquake

这是1989年10月洛马普列塔地震后的一个调查项目，旨在从这次破坏性事件中吸取教训。本课题的目的是利用强震记录来验证和改进目前预测平板建筑漂移响应的分析方法。分析结果表明，平板结构的解析预测响应与实际响应存在差异。由于其固有的灵活性，平板建筑的生存能力在很大程度上取决于控制漂移。因此，对横向漂移的实际估计对于安全设计至关重要。许多平板和平板建筑，高度从6层到20层不等，已经产生了超过20秒的强震数据。将收集这些建筑物中选定数量的记录，以评估漂移响应。将使用规范定义的侧向力和目前接受的分析模型对每个建筑物进行横向漂移分析。然后将使用建筑物底部记录的地面运动来重复分析时间历史反应。通过对预测响应和实测响应的比较，并采用系统识别技术，可以提高现有模型在地震荷载作用下预测平板建筑漂移响应的可靠性。

This is a post Loma Prieta earthquake (Oct. 1989) investigation project in learning from this damaging event. The objective of this project is to utilize the strong- motion records to validate and improve the current analytical methods for predicting the drift response of flat-plate buildings. It has been demonstrated repeatedly that discrepancies exist between the analytically predicted response and the actual response of flat-plate buildings. Because of their inherent flexibility, the survivability of flat- plate buildings very much depends upon controlled drift. A realistic estimate of lateral drift is therefore essential for a safe design. A number of flat-plate and flat-slab buildings, ranging in height from six to twenty stories, have yielded over twenty seconds of strong-motion data. Records from a selected number of these buildings will be collected for evaluation of drift response. Each building will be analyzed for lateral drift using the code defined lateral forces and the currently accepted analytical models. The analyses will then be repeated for time-history response using the ground motion recorded at the base of the buildings. By comparing the predicted and the measured response and using the system identification techniques, the reliability of the existing models for predicting the drift response of flat-plate buildings for an earthquake type of loading could be improved.