长周期地震作用下考虑碰撞效应的偏心隔震结构损伤性能评价

发布时间：2018-11-04 11:59

【摘要】：由于隔震层位移过大或隔震沟间距设置不当会造成偏心隔震建筑结构与周围挡土墙发生碰撞。合理评估扭转耦合效应及碰撞效应对偏心隔震结构损伤性能的影响具有十分重要的意义。建立了单层偏心隔震结构弹塑性侧扭耦合分析模型,并基于Park-Ang损伤指标定义了上部结构的损伤。以近断层地震和远源长周期地震动作为输入,采用弹塑性时程分析方法对单层单向偏心隔震系统进行损伤性能评价。对相关重要参数进行了地震影响分析。研究结果表明,与设计地震动相比,在长周期地震作用下考虑碰撞效应的结构损伤值较高,如果间距设置不当甚至会造成结构损伤失效。上部结构及隔震层偏心会对结构损伤产生不利响应。合理设计隔震沟间距可以保证隔震结构在罕遇地震下不出现失效现象。
[Abstract]:The eccentric isolated building structure will collide with the surrounding retaining wall due to the excessive displacement of the isolation layer or the improper setting of the spacing of the isolation ditch. It is very important to evaluate the effect of torsional coupling effect and collision effect on the damage performance of eccentrically isolated structures. The elastic-plastic lateral torsional coupling analysis model of single-layer eccentrically isolated structure is established and the damage of superstructure is defined based on Park-Ang damage index. Taking near-fault earthquake and long-period earthquake as input, the damage performance of single-layer unidirectional eccentric isolation system is evaluated by elastic-plastic time-history analysis method. Seismic impact analysis of some important parameters is carried out. The results show that compared with the design ground motion, the damage value of the structure considering the collision effect is higher under the action of long-period earthquake, and if the spacing is not set properly, it will even cause the damage failure of the structure. Eccentricity of superstructure and isolation layer will produce adverse response to structural damage. Reasonable design of isolation ditch spacing can ensure that isolation structure does not fail under rare earthquake.
【作者单位】：上海大学土木工程系;
【基金】：国家自然科学基金资助项目(51278291,51308331) 上海市自然科学基金资助项目(15ZR1416200)
【分类号】：TU352.12

【共引文献】