Abstract

The purpose of this study is to evaluate the effect of considering seismic forces in the design of frame-type supporting structures for elevated water tanks (EWTs), and to assess the influence of fluid–structure interaction (FSI) on the overall structural response. Firstly, the developed finite element model is validated in accordance with American Concrete Institute code. Secondly, push-over analysis (POA) is performed to evaluate the performance of EWTs for frame members that are designed based on governing seismic and/or gravity loads. From the POA, the formation of plastic hinges is observed in the frame members, and the lateral stiffness and ductility factor is evaluated for each structure. After that, incremental dynamic analysis is conducted by subjecting the EWTs to a suite of ground motions with different intensities and site–source distances to investigate the influence of including FSI in the EWT analysis. Based on the results, the seismic design of the staging contributes to improvements in terms of the stiffness and ductility of reinforced concrete staging. Additionally, the inclusion of FSI introduces a high nonlinearity to the EWT analysis and can drastically change the response of the structure based on the characteristics of the ground motion.

摘要

本研究的目的是评估在高架水箱 (EWT) 框架式支撑结构设计中考虑地震力的效果，并评估流固耦合 (FSI) 对整体结构响应的影响。首先，根据美国混凝土协会规范对开发的有限元模型进行验证。其次，执行推覆分析 (POA) 以评估基于控制地震和/或重力载荷设计的框架构件的 EWT 的性能。从 POA 中，可以观察到框架构件中塑性铰的形成，并评估每个结构的横向刚度和延展性系数。在那之后，通过使 EWT 经受一系列具有不同强度和站点源距离的地面运动来进行增量动态分析，以研究在 EWT 分析中包括 FSI 的影响。根据这些结果，分段的抗震设计有助于提高钢筋混凝土分段的刚度和延展性。此外，FSI 的包含为 EWT 分析引入了高度非线性，并且可以根据地面运动的特征显着改变结构的响应。