项目名称： RC框架-阶梯墙新型抗震结构关键问题研究

项目编号： No.51508295

项目类型： 青年科学基金项目

立项/批准年度： 2016

项目学科： 建筑环境与结构工程学科

项目作者： 许卫晓

作者单位： 青岛理工大学

项目金额： 20万元

中文摘要： 多层钢筋混凝土（RC）框架结构占我国建筑总量的30%以上。传统意义上普遍认为其具有较好的抗震性能，但近年发生的破坏性地震中大量RC框架结构发生倒塌，且呈现典型的层屈服机制，并以底部坍塌最为普遍。为此，本项目提出一种RC框架-阶梯墙新型抗震结构体系，其由在各楼层中具有不同抗侧刚度的阶梯型抗震墙与主体框架组合而成，来实现层间刚度与层间剪力在各楼层的一致性分布，形成各层层间变形均匀分布的整体损伤机制。体系中的阶梯墙将分担大部分水平剪力从而保护框架柱，框架柱主要起承重作用，促进了结构抗侧力与承重构件的功能分区。该体系既可用于新建建筑，也可用于既有结构的抗震加固，经济实用，可在普通多层RC框架结构中广泛应用。本项目综合采用理论分析、试验研究与数值分析手段，考察该新型结构体系的动力反应特征、损伤特性、失效模式、抗倒塌能力等方面的抗震性能，并建立相关设计方法，促进该结构体系在实际工程中的应用。

中文关键词： 钢筋混凝土框架；抗地震倒塌；损伤机制；阶梯墙

英文摘要： Multi-story reinforced concrete (RC) frame structures take up more than 30% of the total buildings in China. And it is traditionally supposed to have satisfactory seismic performance. However, a large amount of RC frames collapsed in the past mega-earthquakes, and weak story yield mechanism widely happened, in which the collapse of bottom stories was most commonly observed. This research project proposes a novel seismic stepped wall-frame structure, which is composed of the main frame and stepped structural wall with varying stiffness in the different stories to form the consistent distribution between the story stiffness and shear force. And the overall damage mechanism with uniformly distributed inter-story drift could be achieved. The proposed stepped wall could shear most lateral seismic shear force, thus the columns are protected. The main function of columns is bearing the gravity of the structure. The structural resistance systems for lateral force and gravity are constituted by different structural members. The proposed system can be applied in both new buildings and seismic retrofit of existing buildings and is adaptive in the common multi-story RC frames for its economical and practical characteristics. The seismic performance of the proposed structural system regarding its dynamic response characteristic, damage mechanism, failure mode and collapse resistant capacity are examined by theoretical, experimental and numerical investigations. Relevant design method is also established to promote the application of the proposed structural system.

英文关键词： reinforced concrete frame;seismic collapse resistance;damage mechanism;stepped wall