多遇地震作用下错层框架的非线性分析
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摘要
通过静力非线性分析,对10层钢筋混凝土错层框架在不同烈度地震作用下的抗震性能进行了研究,数值分析中采用了基于纤维模型有限单元柔度法。分析结果表明,抗震设防烈度越高,弹性和非线性情况下的层间位移角误差越大,建议高设防烈度的结构或者重要及布置复杂的结构对多遇地震作用下的变形值进行修正。对于结构抗震设防烈度为7度时,从计算结果看,由于设计的刚度较大,余量充足,没有明显的薄弱部位,因此1/550的层间位移角限值即使为非线性计算结果也完全可以满足。
The seismic performance of 10-story staggered floor RC frame structure under frequently occurred earthquakes by nonlinear analysis was evaluated.The finite element flexibility method based on fiber model was adopted in simulation.The results showed that the seismic fortification intensity was higher,then error of inner-story drift angles between elastic analysis and plastic analysis was even greater.So it is suggested that the displacements of each story for important structures,complicated structures and high fortification intensity structures under frequently occurred earthquakes must be revised.When the seismic fortification intensity was 7,because the stiffness of design was great,the allowance was enough,the frame had not obvious weakness,1/550 as limit of inner-story drift angles was satisfied with results of nonlinear calculation.
The seismic performance of 10-story staggered floor RC frame structure under frequently occurred earthquakes by nonlinear analysis was evaluated.The finite element flexibility method based on fiber model was adopted in simulation.The results showed that the seismic fortification intensity was higher,then error of inner-story drift angles between elastic analysis and plastic analysis was even greater.So it is suggested that the displacements of each story for important structures,complicated structures and high fortification intensity structures under frequently occurred earthquakes must be revised.When the seismic fortification intensity was 7,because the stiffness of design was great,the allowance was enough,the frame had not obvious weakness,1/550 as limit of inner-story drift angles was satisfied with results of nonlinear calculation.
引文
[1]GB50011-2001,建筑抗震设计规范[S].
[2]周德源,邹翾,党向东.钢筋混凝土框架滞回过程的柔度分析法[J].石家庄铁道学院学报,2004,17(4):34—37.
[3]伍永飞,周德源.钢筋混凝土框架结构非线性全过程分析的一种新方法[J].地震工程与工程振动,2006,26(4):42—46.
[4]黄宗明,陈滔.基于有限单元柔度法和刚度法的非线性梁柱单元比较研究[J].工程力学,2003,20(5):24—31.
[5]吕西林,金国芳,吴晓涵.钢筋混凝土结构非线性有限元理论与应用[M].上海:同济大学出版社,1997.
[6]周志军,刘喜平.高震区框架结构的薄弱变形验算[J].陕西理工学院学报(自然科学版),2007,23(3):26—29.
[2]周德源,邹翾,党向东.钢筋混凝土框架滞回过程的柔度分析法[J].石家庄铁道学院学报,2004,17(4):34—37.
[3]伍永飞,周德源.钢筋混凝土框架结构非线性全过程分析的一种新方法[J].地震工程与工程振动,2006,26(4):42—46.
[4]黄宗明,陈滔.基于有限单元柔度法和刚度法的非线性梁柱单元比较研究[J].工程力学,2003,20(5):24—31.
[5]吕西林,金国芳,吴晓涵.钢筋混凝土结构非线性有限元理论与应用[M].上海:同济大学出版社,1997.
[6]周志军,刘喜平.高震区框架结构的薄弱变形验算[J].陕西理工学院学报(自然科学版),2007,23(3):26—29.
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