某钢与混凝土混合结构超高层的抗震性能分析——弹塑性时程分析
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摘要
某框架-核心筒超高层结构,采用钢管混凝土柱、型钢混凝土梁框架及钢筋混凝土核心筒的混合结构形式。弹塑性时程分析表明结构满足规范的"大震不倒"要求,并给出了结构薄弱部位。同时,以此工程为例,通过大量的计算,重点分析了地震波选取、阻尼比取值、钢筋强度等级等因素对计算结果的影响及大震弹性计算与大震弹塑性计算的区别。结果表明,对于超高层结构,地震波持时对结果影响很大,阻尼比改变对结果影响较小,采用HRB500钢筋后结构刚度有所增大,大震弹性和大震弹塑性的位移结果接近。
The building discussed is a frame-tube tall building with circular concrete-filled steel tube column,steel reinforced concrete composite beam and concrete core tube shear wall.Performance in elastic-plastic time-history analysis shows that the goal of collapse prevention under expected rare earthquake is achieved,and the weak place of the building is given.Meanwhile,taking this project as an example,the influence of earthquake wave selections,damping ratio values and steel bar strength classes,also the difference between elastic response and elastic-plastic response under rare earthquakes were studied through a number of calculations.It is shown that for high rise buildings,duration of earthquake waves has a great influence on seismic performance while that of different damping ratios is little.It also can be seen that when using HRB500 steel bars the stiffness of the structure will increase and the displacement result of elastic analysis under rare earthquakes is close to that of elastic-plastic analysis.
The building discussed is a frame-tube tall building with circular concrete-filled steel tube column,steel reinforced concrete composite beam and concrete core tube shear wall.Performance in elastic-plastic time-history analysis shows that the goal of collapse prevention under expected rare earthquake is achieved,and the weak place of the building is given.Meanwhile,taking this project as an example,the influence of earthquake wave selections,damping ratio values and steel bar strength classes,also the difference between elastic response and elastic-plastic response under rare earthquakes were studied through a number of calculations.It is shown that for high rise buildings,duration of earthquake waves has a great influence on seismic performance while that of different damping ratios is little.It also can be seen that when using HRB500 steel bars the stiffness of the structure will increase and the displacement result of elastic analysis under rare earthquakes is close to that of elastic-plastic analysis.
引文
[1]GB 50011-2001建筑抗震设计规范[S].
[2]JGJ 3-2002高层建筑混凝土结构技术规程[S].
[3]GB 50011-2010建筑抗震设计规范[S].
[4]JGJ 3-2010高层建筑混凝土结构技术规程[S].
[5]EPDA.多层及高层建筑结构弹塑性静力、动力分析软件[M].
[6]白国良,楚留声,李晓文,等.高烈度区框-筒混合结构动力特性与地震反应研究[J].工业建筑,2007,27(增刊):208-212.
[7]陈麟,周云,张耀春.地震波输入维数和阻尼比对巨型钢框架结构时程分析的影响[J].工业建筑,2004,34(5):182-186.
[2]JGJ 3-2002高层建筑混凝土结构技术规程[S].
[3]GB 50011-2010建筑抗震设计规范[S].
[4]JGJ 3-2010高层建筑混凝土结构技术规程[S].
[5]EPDA.多层及高层建筑结构弹塑性静力、动力分析软件[M].
[6]白国良,楚留声,李晓文,等.高烈度区框-筒混合结构动力特性与地震反应研究[J].工业建筑,2007,27(增刊):208-212.
[7]陈麟,周云,张耀春.地震波输入维数和阻尼比对巨型钢框架结构时程分析的影响[J].工业建筑,2004,34(5):182-186.
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