梯度机制剪力墙结构与功能指向的抗震设计方法

随着我国高层、超高层建筑结构的不断涌现，研发具有多功能、高性能的新型剪力墙结构仍然是工程抗震领域的研究热点。本项目将提出一种具有梯度机制的新型剪力墙结构，该结构将具有传统剪力墙结构和摇摆墙结构的双重机制，并可通过合理设计使不同功能按既定梯度次序出现，从而使结构满足在不同地震风险下的性能要求。项目研究中，将首先系统开展梯度机制剪力墙构件及整体结构的设计及试验研究，深入分析其抗震性能，同时揭示机制转变过程中出现的高频共振和边界非线性等现象及其产生机理。此外，提出同时解决材料、几何和边界非线性的高效动力分析方法，实现此类结构的精细化地震损伤分析。以此为基础，研究匹配于所提梯度机制剪力墙结构的性能评估理论和倒塌评价标准。最终，通过明确结构在不同地震风险下的功能目标，建立梯度机制剪力墙结构基于功能指向的多层次抗震设计理论。

With the emergence of numerous large and high-rise buildings, developing new shear wall structural system with multi-function and high performance is still necessary and have attracted many researchers for investigation. In this project, an innovative shear wall structure with gradient phases which have the deformation mechanism of both traditional shear wall structure and rocking wall structure and can exhibit various functional characteristics under different seismic hazard level is developed. Firstly, the basic concept and components of the proposed shear wall member is introduced. The nonlinear behavior of the wall and the seismic performance of the global structure are investigated comprehensively by a large number of experimental studies and numerical analyses. Moreover, the generation mechanism of high frequency response and the phenomenon of boundary nonlinearity during the process of function shift of shear wall are also studied and revealed. Then, an efficient nonlinear analysis method which is capable of solving material, geometric and boundary nonlinearity problems simultaneously is developed so that the refined seismic damage evaluation of the proposed shear wall structure can be achieved. Based on this method, the seismic performance evaluation method of the proposed shear wall structure is established and its collapse capacity is investigated. Finally, by designating various seismic performance objectives for different hazard level, a functional orientation seismic design theory is developed for the proposed structural system.