考虑楼板效应的钢结构地震反应对比分析
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摘要
以10层钢结构为研究对象,在罕遇地震作用下,通过ANSYS有限元数值方法,对纯框架结构及偏心耗能支撑结构在考虑楼板作用与不考虑楼板作用情况下结构的地震响应进行了比较分析,结果表明:在考虑楼板作用下纯框架结构顶层位移X、Y方向分别减小了31.3%和33.9%;结构顶层加速度X、Y方向分别增大了39.7%和45.2%.由于楼板的约束效应,结构的整体刚度增加,自振周期减小.考虑比不考虑楼板作用同样的耗能结构耗能能力减小了,在分析耗能结构时不能忽略楼板作用.分析结果为钢结构抗震设计提供了参考.
A 10-layer steel structure is studied as the object under a rare earthquake action,the earthquake responses of a pure frame structure and an eccentrically energy dissipating brace structure are analyzed using ANSYS finite element numerical method.The result shows that the top floor displacements in X and Y directions of the pure frame structure,when considering slab action were reduced by 31.3% and 33.9% respectively in contrast with those without considering slab action.The top floor accelerations in X and Y directions of pure frame structure when considering slab action were increased by 39.7% and 45.2% respectively in contrast with those without considering slab action.Because of the constraint effect of floor effect,the natural cycle was decreased.The energy dissipated of the same energy-dissipating structure when considering slab action was reduced than that without considering slab action.The slab action should not be neglected when we analyze the energy-dissipating structure.The results have a definite value for reference in the seismic design of steel structures.
A 10-layer steel structure is studied as the object under a rare earthquake action,the earthquake responses of a pure frame structure and an eccentrically energy dissipating brace structure are analyzed using ANSYS finite element numerical method.The result shows that the top floor displacements in X and Y directions of the pure frame structure,when considering slab action were reduced by 31.3% and 33.9% respectively in contrast with those without considering slab action.The top floor accelerations in X and Y directions of pure frame structure when considering slab action were increased by 39.7% and 45.2% respectively in contrast with those without considering slab action.Because of the constraint effect of floor effect,the natural cycle was decreased.The energy dissipated of the same energy-dissipating structure when considering slab action was reduced than that without considering slab action.The slab action should not be neglected when we analyze the energy-dissipating structure.The results have a definite value for reference in the seismic design of steel structures.
引文
[1]王元清,王斌斌,石永久,等.偏心支撑体系在多层钢框架中的应用研究[J].华中科技大学学报,2007,24(2):1-4.
[2]孙玉萍,王敏.粘弹性阻尼器钢框架减震性能分析[J].甘肃科学学报,2008,20(3):126-129.
[3]张琴,楼文娟,陈勇.粘弹性阻尼器优化目标函数及实现方法[J].工业建筑,2003,33(6):10-13.
[4]王洪涛,谢礼力.考虑楼板作用的钢筋混凝土框架有限元模型及并行计算效率[J].地震工程与工程振动,2009,29(1):63-69.
[5]孙玉萍,王敏,王云.钢框架中粘弹性阻尼器的空间布置优化分析[J].工程抗震与加固改造,2008,30(5):29-32.
[6]孙玉萍,王敏,柳明亮,等.设置阻尼器后门式刚架的减震分析[J].甘肃科学学报,2009,21(1):129-131.
[7]石永久,苏迪,王元清.高层钢框架新型梁柱节点抗震性能影响的试验研究[J].土木工程学报,2006,39(9):26-31.
[8]周云.粘弹性阻尼器减震结构设计[M].武汉:武汉理工大学出版社,2006.
[2]孙玉萍,王敏.粘弹性阻尼器钢框架减震性能分析[J].甘肃科学学报,2008,20(3):126-129.
[3]张琴,楼文娟,陈勇.粘弹性阻尼器优化目标函数及实现方法[J].工业建筑,2003,33(6):10-13.
[4]王洪涛,谢礼力.考虑楼板作用的钢筋混凝土框架有限元模型及并行计算效率[J].地震工程与工程振动,2009,29(1):63-69.
[5]孙玉萍,王敏,王云.钢框架中粘弹性阻尼器的空间布置优化分析[J].工程抗震与加固改造,2008,30(5):29-32.
[6]孙玉萍,王敏,柳明亮,等.设置阻尼器后门式刚架的减震分析[J].甘肃科学学报,2009,21(1):129-131.
[7]石永久,苏迪,王元清.高层钢框架新型梁柱节点抗震性能影响的试验研究[J].土木工程学报,2006,39(9):26-31.
[8]周云.粘弹性阻尼器减震结构设计[M].武汉:武汉理工大学出版社,2006.
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