考虑压拱和悬链线效应的RC框架结构反应修正系数研究

项目名称： 考虑压拱和悬链线效应的RC框架结构反应修正系数研究

项目编号： No.51508099

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： 崔双双

作者单位： 福建工程学院

项目金额： 20万元

中文摘要： 我国抗震设计规范隐含取一个统一的反应修正系数值折减设防烈度下结构产生的弹性力来确定设计地震作用，而没有区分不同结构体系非弹性变形能力的差别，且反应修正系数的子项冗余度系数也未考虑压拱和悬链线效应。本项目以钢筋混凝土框架结构为研究对象，建立考虑性能退化的结构精细化非线性有限元模型，利用结构拟静力试验对有限元模型进行验证和参数校准，采用试验研究和数值模拟相结合的方法揭示梁的压拱和悬链线机理，进而提出考虑压拱和悬链线效应的冗余度系数的确定性和概率计算方法，进一步研究结构反应修正系数的合理取值及概率评定方法。提出适合钢筋混凝土框架结构的设计反应谱，为我国抗震规范中多遇地震影响系数曲线的修正提供理论支持。

中文关键词： 钢筋混凝土框架结构；；结构反应修正系数；确定性与概率评定；结构冗余度系数；压拱和悬链线效应

英文摘要： The design seismic force is determined by a single structural response modification factor to reduce the elastic responses under the design intensity in our currently Code, without considering the influences of different inelastic energy dissipation capacities of different structures. What’s more, compressive arch and catenary action aren’t taken into account in calculation theory of redundancy coefficient which is partial factor of response modification factor. Reinforced concrete frames are the research object of this project, the fined numerical simulations of RC frame structures which can better simulate the deterioration of structural components are carried out. The modeling approach and analysis results are verified and validated by pseudo-static test data for RC frame structure. Experimental study and numerical simulation are combined to reveal compressive arch and catenary mechanism. Then deterministic and probabilistic formula of redundancy coefficient considering the effects of compressive arch and catenary action are evaluated. Furthermore, the quantification and probabilistic assessment of structural response modification factors are studied. Seismic design response spectrum for reinforced concrete frames is suggested. The results from above research can provide the theoretical supports for the improvement of the seismic influence coefficient curves under minor earthquakes in the current Chinese seismic code.

英文关键词： Reinforced concrete frames;Structural response modification factor;Deterministic and reliability-based evaluation;Structural redundancy coefficient;Compressive arch and catenary action