高层建筑结构嵌固条件影响研究

STUDY ON THE EFFECT OF EMBEDDED CONDITIONS FOR HIGH-RISE BUILDINGS

该文对国内外考虑地下室及周边土体对高层建筑地震作用影响分析方面的研究进展进行了回顾,基于塔楼、地下室结构与周边土体的相互作用机理,建立可以考虑地基基础影响的力学模型。根据场地情况确定地下室周边土体弹簧及相应阻尼的计算参数。考察地下室顶板嵌固、地下室周边嵌固、底板嵌固以及土体-结构相互作用等4类嵌固条件在地震作用下计算结果的合理性,并研究塔楼单侧洞口长度对整体结构与结构构件受力性能的影响。分析结果表明:地下室顶板嵌固模型塔楼侧向刚度偏大,且无法考虑地下室与塔楼之间的相互影响。地下室周边嵌固模型无法反映地下室结构的变形与质量引起的惯性力,在地震作用下水平剪力沿地下室竖向减小过快,计算结果偏于不安全。底板嵌固模型忽略周边土体的作用,导致地下室在地震作用下水平剪力过大,计算结果过于保守。土体-结构相互作用模型可以较为真实地模拟地下室周边土体的刚度与阻尼,与其他计算模型相比,虽然塔楼性能变化较小,但地下室构件内力变化很大。单侧洞口对塔楼整体受力性能影响较小,但对框架柱和楼板的影响值得重视。

The research progress of the seismic effect analysis of basement surrounding soil on high-rise buildings home and abroad was reviewed.Based on the interaction between the tower and,basement and,surrounding soil,a high-rise building analytical model that could consider the influence of foundations was established.The calculation parameters of the soil spring around basement and corresponding damping were determined according to the site conditions.The rationality of the calculation results of four kinds of embedded conditions including basement roof embedded,basement surrounding embedded,foundation embedded and soil-structure interaction under earthquake was investigated,and the influence of the length of one side opening of the tower on the mechanical performance of the overall structure and of the structural members was studied.The analysis results show that the lateral stiffness of the basement roof embedded model is relatively large,and the interaction between basement and tower cannot be considered.The basement surrounding embedded model cannot reflect the structural deformation and the inertial force caused by the basement mass,and the horizontal shear force decreases too fast along the vertical direction of the basement under earthquakes.Therefore,the calculation results are unsafe.The foundation embedded model ignores the effect of the soil around the basement,resulting in an excessive horizontal shear force of basement under earthquakes,and the calculation results are too conservative.The soil-structure interaction model can realistically simulate the stiffness and damping of the soil around the basement,compared with the other calculation models,although the situation of the tower changes little,the internal force of the basement components changes greatly.The single side opening has little influence on the overall mechanical performance of the tower,but the influence on the frame column and slab should be paid attention to.