三维复杂高层建筑抗震性能动力时程分析
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摘要
为了避免抗震设计规范中定性条文的不确定性限制而合理评价复杂型式高层结构整体抗震性能,通过建立大规模三维有限元数值模型和采用Newmark逐步积分方法求解考虑几何非线性大变形的动力平衡方程,并将时程分析法与振型分解反应谱法进行对比分析。计算分析表明:三组地震波输入计算所得的结构各自底部剪力、平均底部剪力与基底剪重比均满足规范限值要求;从变形和内力结果上看,结构两水平方向侧向刚度差异较明显;时程内两水平向层间位移角平均最大幅值亦满足规范限值要求,但结构型式空间布局变化较大,结构沿高度存在多处刚度转换层,层间位移角发生多处突变;另外,结构局部区域竖向构件侧向转角超出规范线性层间位移角限值,结构局部可能会存在应力集中现象,在工程设计中应予以考虑。
For the aim to avoid the limitation of the qualitative items of the Code for seismic design of buildings and reasonably evaluate the dynamic properties of high-rise buildings,dynamic equilibrium equations considering geometric nonlinearity and large deformation are solved by using Newmark step-by-step integration method based on three-dimensional finite element model,and comparative analysis with the results of spectrum response is conducted as well.Computational analysis reveals that the maximum values of respective base shear,mean base shear and mean shear-gravity ratios under the inputs of three seismic waves are within the allowed values of the Code demands;it is indicated from the results of internal forces and displacements that the difference between the two translational stiffness in two horizontal directions is obvious;furthermore,though computed mean maximum values of inter-story drifts in time domain meet the requirement of the Code,there are visible extreme points where sudden change of inter-story drifts occurs and the counterpart angels of rotation in local area of structure are excessive,which should be emphasized in engineering design.
For the aim to avoid the limitation of the qualitative items of the Code for seismic design of buildings and reasonably evaluate the dynamic properties of high-rise buildings,dynamic equilibrium equations considering geometric nonlinearity and large deformation are solved by using Newmark step-by-step integration method based on three-dimensional finite element model,and comparative analysis with the results of spectrum response is conducted as well.Computational analysis reveals that the maximum values of respective base shear,mean base shear and mean shear-gravity ratios under the inputs of three seismic waves are within the allowed values of the Code demands;it is indicated from the results of internal forces and displacements that the difference between the two translational stiffness in two horizontal directions is obvious;furthermore,though computed mean maximum values of inter-story drifts in time domain meet the requirement of the Code,there are visible extreme points where sudden change of inter-story drifts occurs and the counterpart angels of rotation in local area of structure are excessive,which should be emphasized in engineering design.
引文
[1]LU X L,ZHOU Q.Dynamic analysis method of acombined energy dissipation system and its experimental verification[J].Earthquake Engineering&Structural Dynamics,2002,31(6):1251-1265.
[2]沈朝勇,吴波,周福霖,等.高层错位转换结构的试验研究和理论分析[J].地震工程与工程振动,2006,26(2):33-44.
[3]邹昀,吕西林,朱杰江.基于性能的抗震设计方法在某复杂超高层结构中的应用研究[J].工程力学,2008,25(9):93-99.
[4]吕西林,陈跃,卢文胜,等.高位转换超限高层结构整体模型振动台试验研究[J].同济大学学报,2006,36(6):711-716.
[5]LEE H S,KO D W.Seismic response characteristics of high-rise RC wall buildings having different irregularities in lowerstories[J].Engineering Structures,2007,29(11):3149-3167.
[6]BISCH P,COIN A.Seismic behavior of slightly reinforced concrete walls:experiments and theoretical conclusions[J].Bulletin of Earthquake Engineering,2007,5(1):45-65.
[7]KO D W,LEE H S.Shaking table tests on a high-rise RC building model having torsional eccentricity in soft lowerstoreys[J].Earthquake Engineering and Structural Dynamics,2006,35(11):1425-51
[8]晏启祥,刘浩吾,何川.一种改进的W ilson-θ法及算法稳定性[J].土木工程学报,2003,36(10):76-79.
[9]郭泽英,李青宁.Newmark精细积分格式及其在地震反应分析中的应用[J].地震工程与工程振动,2007,27(4):30-34.
[10]吴斌,保海娥.实时子结构实验Chang算法的稳定性和精度[J].地震工程与工程振动,2006,26(2):41-48.
[11]缪建成,朱平,陈关龙,等.基于Newmark格式的多柔体系统子循环算法研究[J].固体力学学报,2008,29(2):193-199.
[2]沈朝勇,吴波,周福霖,等.高层错位转换结构的试验研究和理论分析[J].地震工程与工程振动,2006,26(2):33-44.
[3]邹昀,吕西林,朱杰江.基于性能的抗震设计方法在某复杂超高层结构中的应用研究[J].工程力学,2008,25(9):93-99.
[4]吕西林,陈跃,卢文胜,等.高位转换超限高层结构整体模型振动台试验研究[J].同济大学学报,2006,36(6):711-716.
[5]LEE H S,KO D W.Seismic response characteristics of high-rise RC wall buildings having different irregularities in lowerstories[J].Engineering Structures,2007,29(11):3149-3167.
[6]BISCH P,COIN A.Seismic behavior of slightly reinforced concrete walls:experiments and theoretical conclusions[J].Bulletin of Earthquake Engineering,2007,5(1):45-65.
[7]KO D W,LEE H S.Shaking table tests on a high-rise RC building model having torsional eccentricity in soft lowerstoreys[J].Earthquake Engineering and Structural Dynamics,2006,35(11):1425-51
[8]晏启祥,刘浩吾,何川.一种改进的W ilson-θ法及算法稳定性[J].土木工程学报,2003,36(10):76-79.
[9]郭泽英,李青宁.Newmark精细积分格式及其在地震反应分析中的应用[J].地震工程与工程振动,2007,27(4):30-34.
[10]吴斌,保海娥.实时子结构实验Chang算法的稳定性和精度[J].地震工程与工程振动,2006,26(2):41-48.
[11]缪建成,朱平,陈关龙,等.基于Newmark格式的多柔体系统子循环算法研究[J].固体力学学报,2008,29(2):193-199.
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