既有框架结构隔震改造后体系稳定性与动力响应分析
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吴巧智,硕士研究生,主要研究方向为结构减震控制。E-mail:402806041@qq.com

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宁夏重点研发计划项目(2021BEG03022);宁夏青年科技人才托举工程(TJGC2019001,TJGC2019007);中国科学院“西部之光”人才培养计划项目(XAB2021YW14);宁夏建设科技计划项目(JSKJ2021-16)


Stability and dynamic response of the series isolation system for existing frame structures after isolation retrofitting
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    摘要:

    针对隔震改造后叠层橡胶隔震支座与地下室下支柱组成的串联隔震体系的地震稳定性问题,采用理论推导与数值模拟方法开展系统研究。将叠层橡胶支座简化为一种具有水平刚度和抗弯刚度的特殊铰支座,RC柱简化为弯曲型竖杆,建立橡胶支座和RC柱串联隔震体系的理论模型,推导地下室下支柱的临界承载力方程;通过实际案例求解出该串联隔震体系的临界承载力具体表达式,并对典型参数的影响进行分析;采用数值模拟方法建立下支柱截面尺寸不同的6种柱顶隔震模型,对下支柱柱顶、隔震支座、下支柱与隔震支座串联后整体位移响应以及上部结构层间位移角响应进行对比分析。结果表明:所推导的临界承载力表达式变化规律与柱顶隔震设计模型数值模拟相一致;下支柱截面增大对上部结构和隔震支座的动力响应影响并不明显,但是可以明显减小下支柱的位移;在既有建筑隔震改造实际工程中,增加下支柱的截面尺寸是保证下部结构的抗震能力高于上部结构既简单且行之有效的方法,但实际工程中截面增量普遍较大且偏于保守,造成了一定的浪费。

    Abstract:

    Based on theoretical derivation and numerical simulation methods, a systematic study was carried out on the seismic stability of a series isolation system after isolation retrofitting, which is composed of laminated rubber isolation bearings and the lower pillar of the basement. The laminated rubber bearing was simplified to a special hinge bearing with horizontal stiffness and flexural rigidity, while the RC column was simplified to a curved vertical rod. Then a theoretical model of the series isolation system was established, and the equation for the critical bearing capacity of the lower pillar of the basement was derived. The concrete expression of the critical bearing capacity was solved based on practical cases, and the influences of typical parameters were analyzed. Six kinds of column top isolation models with different lower pillar section dimensions were established by the numerical simulation method. Then the overall displacement response of the system and the response of the story drift ratio in the superstructure were compared and analyzed. Results show that the variation of deduced expression for the critical bearing capacity was consistent with the numerical simulation results of the column top isolation model. The increase in the cross section of the lower pillar has no obvious effect on the dynamic response of the superstructure and the isolation bearing, but it could remarkably reduce the displacement of the lower pillar. In the actual seismic isolation reconstruction project for existing buildings, increasing the lower pillar section size is a simple and effective method for ensuring that the seismic capacity of the lower structure is higher than that of the upper structure. However, in practical projects, the section increment is generally large and conservative, resulting in some waste.

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吴巧智,包超,马肖彤,曹纪兴,谭伏波,高宁泉.既有框架结构隔震改造后体系稳定性与动力响应分析[J].地震工程学报,2023,(1):103-111. WU Qiaozhi, BAO Chao, MA Xiaotong, CAO Jixing, TAN Fubo, GAO Ningquan. Stability and dynamic response of the series isolation system for existing frame structures after isolation retrofitting[J]. China Earthquake Engineering Journal,2023,(1):103-111.

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  • 在线发布日期: 2023-01-21