外包钢加固对框架结构地震响应的影响
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摘要
为研究外包钢加固对框架结构质量、刚度、周期的影响,结合具体的工程实例,采用有限元程序SAP2000,对加固后某5层钢筋混凝土框架结构进行弹塑性分析。研究结果表明,外包钢加固会引起构件内力的重分布,弹性状态下形成刚度软弱层,抗震设计时,应从构件截面和结构整体变形两个方面来评价加固后整体结构的抗震性能。
To study the effect on the mass、stiffness and period after strengthening concrete column with external steel-enclosed at bottom layer,a FEA software package SAP2000 was employed to one five-storey reinforced concrete frame structure to do the dynamic analysis on the seismic behavior.The results show that the internal force redistribution was occurred by strengthening local members with external steel-enclosed at bottom layer.Stiffness soft layer in the elastic state and strength weak layer in the plastic state were formed either.Furthermore,the double level of member section and structural deformation should be take into account in the aseismic strengthening design of the integral structure.
To study the effect on the mass、stiffness and period after strengthening concrete column with external steel-enclosed at bottom layer,a FEA software package SAP2000 was employed to one five-storey reinforced concrete frame structure to do the dynamic analysis on the seismic behavior.The results show that the internal force redistribution was occurred by strengthening local members with external steel-enclosed at bottom layer.Stiffness soft layer in the elastic state and strength weak layer in the plastic state were formed either.Furthermore,the double level of member section and structural deformation should be take into account in the aseismic strengthening design of the integral structure.
引文
[1]吕西林.建筑结构加固设计[M].北京:科学出版社,2001.
[2]梁坦.建筑物可靠性鉴定与加固改造的发展[J].四川建筑科学研究,1994,20(3),35-41.
[3]姚谦峰,苏三庆.地震工程[M].西安:陕西科学技术出版社,2000.
[2]梁坦.建筑物可靠性鉴定与加固改造的发展[J].四川建筑科学研究,1994,20(3),35-41.
[3]姚谦峰,苏三庆.地震工程[M].西安:陕西科学技术出版社,2000.
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