基础隔震结构位移的扭转放大效应研究

发布时间：2018-04-17 21:46

本文选题：基础隔震 + 扭转效应　；参考：《南京航空航天大学》2015年硕士论文

【摘要】：隔震技术在高烈度地震区得到大力推广,建筑物基础隔震结构将越来越多。当前需要注意隔震结构受大震检验的实例仍然极少,大震下隔震层的安全性与稳定性仍然存疑。考虑到隔震层尺寸大、控制结构扭转对隔震体系的安全性和稳定性极为重要,因此在大震条件下,开展隔震结构扭转位移反应影响因素和控制指标的研究重要而迫切。论文在对结构扭转评估理论分析的基础上,依托实际隔震工程,对影响隔震结构扭转各参数进行了统计,获得了当前设计规范下隔震支座位移扭转放大系数等关键指标。具体成果如下:(1)隔震工程的等效扭转平动周期比在0.7~0.9之间;平动等效阻尼比在0.08~0.16之间,平均值为0.11;扭转等效阻尼比一般小于0.25;偏心率范围在0.01~0.05之间,平均值为0.03;隔震层边支座到刚心处的距离与等效回转半径之比在1.3~1.9之间;(2)在平动等效阻尼比0.10、扭转等效阻尼比0.25、周期比为0.9、偏心率在0.01~0.05之间时,隔震层边支座位移放大系数在1.030~1.207之间。由此可见,抗震规范规定扭转影响系数不宜小于1.2是符合实际情况的;(3)对隔震参数扭转影响的敏感性分析表明,在前述实际工程参数范围内(扭转等效阻尼比在0.05~0.30之间),偏心率对扭转效应的影响最显著,其次分别为等效周期比、扭转等效阻尼比、平动等效阻尼比。
[Abstract]:The isolation technology has been popularized in the area with high seismic intensity, will be more and more base isolation buildings. The need to pay attention to earthquake test examples by isolation structure are still very few, under major earthquake safety and stability of the isolation layer is still in doubt. Considering the size of the isolation layer, the control structure of torsion on the safety and isolation system the stability is very important, so in the earthquake conditions, carry out isolation torsional displacement response research on influencing factors and control index is important and urgent. Based on the assessment of torsion structure on the basis of theoretical analysis, based on the actual engineering effect on the isolation, statistical parameters of reverse isolation structure, the current design specification under isolation displacement amplification coefficient of torsion and other key indicators. The results are as follows: (1) the equivalent aseismic engineering torsional translational cycle than in the 0.7~0.9 between the translational equivalent damping ratio in 0.; Between 08~0.16, the average value is 0.11; the torsional equivalent damping ratio is less than 0.25; the eccentric rate is in the range of 0.01~0.05, the average value is 0.03; layer side supports to the distance from the equivalent radius of gyration just at the heart than in 1.3~1.9 between isolation; (2) the translational equivalent damping ratio of 0.10, reversing the equivalent damping ratio of 0.25. Cycle ratio is 0.9, the eccentric rate is between 0.01~0.05, the isolation layer side support displacement amplification coefficient between 1.030~1.207. Thus, the regulations change coefficient of not less than 1.2 is consistent with the actual situation; (3) showed that the sensitivity analysis of the parameters of torsion effect of isolation, in the range of the actual engineering parameters (equivalent torsion the damping ratio between 0.05~0.30). The effect of eccentricity on the torsion effect was most significant, followed by the equivalent torsional period ratio, equivalent damping ratio, translational equivalent damping ratio.

【学位授予单位】：南京航空航天大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU352.12

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