基于梁塑性转需求的钢框架抗震分析
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摘要
为实现建筑结构抗震性能化设计,本文使用简化的方法研究了梁的塑性变形需求。首先,介绍了框架侧移的组成。接着,在"强柱弱梁"和"强节点弱构件"的假定下,建立了框架梁的塑性变形需求的计算公式,所建立的公式考虑了弯矩重分配、塑性铰机制和钢材应变硬化效应等问题。最后,对一榀6层无侧向支撑的钢框架算例进行分析,通过简化方法得到的计算结果与用SAP2000非线性静力分析得到的结果进行对比,两者具有良好的一致性。
In the present study,a simple method of estimating the plastic rotation of beams was studied to realize performance-based design of buildings. Firstly,the composition of steel-frame story drift was introduced. Secondly,the expressions to estimate the plastic rotation of beams,addressing moment redistribution,plastic mechanism and strain-hardening effect of steel,were developed on the basis of strong column-weak beam and strong connectionweak connected member. Finally,a case study of 6-story plane steel-frame was carried out,which shows good agreement between nonlinear static analytic results by SAP2000 and the results obtained by the proposed method.
In the present study,a simple method of estimating the plastic rotation of beams was studied to realize performance-based design of buildings. Firstly,the composition of steel-frame story drift was introduced. Secondly,the expressions to estimate the plastic rotation of beams,addressing moment redistribution,plastic mechanism and strain-hardening effect of steel,were developed on the basis of strong column-weak beam and strong connectionweak connected member. Finally,a case study of 6-story plane steel-frame was carried out,which shows good agreement between nonlinear static analytic results by SAP2000 and the results obtained by the proposed method.
引文
[1]蒋欢军,吕西林.钢筋混凝土框架结构层间位移角与构件变形关系研究[J].地震工程与工程振动,2009,29(2):66-72.JIANG Huanjun,LU Xilin.Study on the relationship between story drift and element deformation for reinforced concrete frames[J].Journal of Earthquake Engineering and Engineering Vibration,2009,29(2):66-72.(in Chinese)
[2]T.鲍雷,M.J.N.普利斯特利.钢筋混凝土和砌体结构的抗震设计[M].北京:中国建筑工业出版社,1999:106-114.T.Paulay,M.J.N.Priestey.Seismic Design of Reinforced Concrete and Masonry Buildings[M].S].Beijing:Building Industry Press of China,1999:106-114.(in Chinese)
[3]吕西林,郭子雄,王亚勇.RC框架梁柱组合件抗震性能试验研究[J].建筑结构学报,2001,22(1):2-7.LXilin,GUO Zixiong,WANG Yayong.Experimental research of aseismic performance of RC sub-assemblages[J].Building Structures,2001,22(1):2-7.(in Chinese)
[4]罗文斌,钱稼茹.RC框架弹塑性位移的解构规则与构件的目标侧移角[J].工程力学,2003,20(5):32-36.LUO Wenbin,QIAN Jiaru.Rules of elastoplastic drift decomposition of RC framess and the target drift of members[J].Engineering Mechanics,2003,20(5):32-36.(in Chinese)
[2]T.鲍雷,M.J.N.普利斯特利.钢筋混凝土和砌体结构的抗震设计[M].北京:中国建筑工业出版社,1999:106-114.T.Paulay,M.J.N.Priestey.Seismic Design of Reinforced Concrete and Masonry Buildings[M].S].Beijing:Building Industry Press of China,1999:106-114.(in Chinese)
[3]吕西林,郭子雄,王亚勇.RC框架梁柱组合件抗震性能试验研究[J].建筑结构学报,2001,22(1):2-7.LXilin,GUO Zixiong,WANG Yayong.Experimental research of aseismic performance of RC sub-assemblages[J].Building Structures,2001,22(1):2-7.(in Chinese)
[4]罗文斌,钱稼茹.RC框架弹塑性位移的解构规则与构件的目标侧移角[J].工程力学,2003,20(5):32-36.LUO Wenbin,QIAN Jiaru.Rules of elastoplastic drift decomposition of RC framess and the target drift of members[J].Engineering Mechanics,2003,20(5):32-36.(in Chinese)
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