双段消能摇摆钢框架结构抗震性能影响因素与设计方法

Influencing Factors and Seismic Design Procedure of Steel Frame Coupled with Dual-rocking Structure

摘要:

对双段消能摇摆钢框架结构抗震性能的影响因素进行了系统的参数分析，基于我国建筑抗震设计规范给出了设计要求。首先，提出了双段消能摇摆钢框架结构的简化分析模型，结合弹塑性地震反应分析结果，验证了简化分析模型的有效性；然后，归纳了影响双段消能摇摆钢框架结构地震反应的量纲一参数，对简化分析模型进行参数分析，基于各参数的影响规律得到了量纲一参数的设计建议范围；最后，提出了双段消能摇摆钢框架结构的设计方法，并结合算例加以验证。结果表明，罕遇地震作用下双段消能摇摆钢框架结构的抗震性能良好，合理设计的双段摇摆钢桁架在地震作用下的构件内力较单段摇摆钢桁架显著降低，与阻尼器配合能够抑制薄弱层的产生，并减小结构地震反应，具有工程可实施性。

Abstract:

In this paper， a systematic parametric study is conducted to investigate factors affecting the seismic performance of steel frame coupled with dual-rocking structure （DRF）. Design requirements are proposed based on the Chinese code for the seismic design of buildings. Firstly， a simplified analytical model for DRF is introduced and validated through elastic-plastic seismic response analysis. Subsequently， dimensionless parameters affecting the seismic response of DRF are identified and optimal value range is determined through parametric studies of the simplified analytical model. Finally， a seismic design procedure for DRF is proposed and validated through numerical examples. It is shown that the seismic performance of DRF under maximum considered earthquake is satisfactory. Rationally designed dual-rocking steel frames exhibit significantly reduced internal forces within structural components compared to single-rocking steel frames. When coupled with dampers， dual-rocking steel frames can suppress weak stories and mitigate seismic responses， demonstrating practical engineering feasibility.