Seismic Design and Parametric Response Evaluation of Unbonded Post-Tensioned Hybrid Coupled Walls

本项目所进行的研究与混合墙体系统有关。 需要在以下方面对混合墙系统进行进一步的研究：（1）开发新的和创新的混合墙连接和系统;（2）混合墙系统抗震性能的参数评估。 本研究的主要目的是分析研究一种新型的采用无粘结后张法连接墙体的混合联肢墙的抗震性能和设计。 与目前的工业实践和研究相比，无粘结后张法在混合联肢墙体系中的应用是一个重大的创新。 建议的系统包括钢筋混凝土墙和钢连梁。 采用无粘结后张法，可以简化连梁和墙体的构造。 此外，可以预期的是，通过使用无粘结后张拉，可以将连梁设计成在“设计”水平地面运动期间基本上保持“无损伤”，本文的主要研究内容包括：（1）建立无粘结柱连接的抗震性能分析模型;张力混合耦合墙;（2）进行参数地震反应评估这些墙;（3）制定初步的抗震设计建议和实际应用指南，这些墙。 将建立原型结构中联肢墙的分析模型，并对这些墙进行一系列的参数非线性静力和动力时程分析。 分析模型将使用在利哈伊大学获得的无粘结后张钢框架子组件的实验结果进行验证，该子组件的连接类似于拟议系统中使用的连梁-墙连接。 基于非线性动力时程分析的结果，本研究将评估无粘结后张预应力混合联肢墙的抗震性能，并制定实用的分析和设计程序以及实际应用指南。 该项目得到了NSF 97-154倡议第四年完成的支持。 研究的成功完成将提供一个分析基础，在此基础上可以建立未来的实验研究和编纂的设计规范可以制定。

The research conducted in this project is related to hybrid wall systems. Additional research is need on hybrid wall systems in the following areas: (1) development of new and innovative hybrid wall connections and systems; (2) parametric evaluation of the seismic behavior of hybrid wall systems. This project addresses these needs.The broad objective of this research is to analytically investigate the seismic behavior and design of a new type of hybrid coupled wall which uses unbonded post-tensioning to couple the walls. Compared with current industry practice and current research, the use of unbonded post tensioning, in a hybrid coupled wall system is significant innovation. The proposed system consists of reinforced concrete walls and steel coupling beams. It is expected t hat by using unbonded post-tensioning, the detailing of the coupling beams and the walls can be simplified. Furthermore, it is anticipated that by using unbonded post tensioning the coupling beams can be designed to remain essentially "damage-free" during a "design" level ground motion, with most of the damage occurring in certain selected components of the beam-to-wall connections which can be replaced after the ground motion.The research task include (1) developing and analytical models for the hysteric behavior of unbonded post-tension hybrid coupled walls; (2) performing a parametric seismic response evaluation of these walls; (3) developing preliminary seismic design recommendations and practical application guidelines for these walls. Analytical model of the coupled walls in the prototype structures will be developed and a series of parametric nonlinear static and nonlinear dynamic time history analyses of these walls will be conducted. The analytical models will be verified using experimental results obtained at Lehigh University on unbonded post tensioned steel frame subassemblages with connections similar to the coupling beam-to-wall connections used in the proposed system. Based on the results of the nonlinear dynamic time-history analyses, the research will assess the seismic behavior of unbonded post-tensioned hybrid coupled walls and develop practical analysis and design procedures and practical application guidelines. This project is supported under the 4th year completion of initiative NSF 97-154. Successful completion of the research will provide an analytical foundation on which future experimental research can be built and codified design specifications can be formulated.