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环境温度变化会引起超长基础隔震结构响应与动力特性发生改变。基于某超长复杂基础隔震结构健康监测系统实测的隔震层温度、隔震支座水平位移及上部结构加速度响应数据,分析了环境温度对隔震支座水平位移及结构动力特性的影响规律。首先,从理论上分析了温度对隔震支座水平位移的影响机理,并对隔震层温度与隔震支座水平位移进行了相关性分析。同时,对环境温度对基础隔震结构动力特性的影响机理进行了理论分析,并结合隔震支座温度相关性试验结果,对结构动力特性与环境温度的相关性分析结果进行了验证。结果表明,环境温度与隔震支座水平位移具有较强相关性;环境温度与隔震结构动力特性的相关性分析结果与隔震支座温度相关性试验所得到的结果具有较好的一致性;最后,通过参数回归分析,给出了超长复杂基础隔震结构隔震支座水平位移、模态频率的温度相关性模型,并给出了温度对超长复杂基础隔震结构模态频率的影响系数曲线,为准确、合理评估隔震结构的性能状态提供依据。
Changes in ambient temperature can cause changes in the response and dynamic characteristics of the long base isolated structure. Based on the measured data of the isolation layer temperature, the horizontal displacement of the isolated bearing and the acceleration response data of the superstructure, the influence of the ambient temperature on the horizontal displacement of the isolated bearing and the dynamic characteristics of the structure are analyzed. . First of all, the influence mechanism of temperature on the horizontal displacement of the isolation bearings is theoretically analyzed, and the correlation between the temperature of the isolation layer and the horizontal displacement of the isolation bearings is also analyzed. At the same time, the influence mechanism of the ambient temperature on the dynamic characteristics of the base isolation structure is theoretically analyzed, and the correlation analysis between the dynamic characteristics of the structure and the ambient temperature is verified with the temperature dependence test results of the isolation bearing. The results show that the ambient temperature has a strong correlation with the horizontal displacement of the isolation bearings. The correlation between the ambient temperature and the dynamic characteristics of the isolation structure has good consistency with the temperature dependence test of the isolation bearings Finally, the temperature dependence of the horizontal displacement and modal frequency of the isolated base of the extra-long complex base isolation structure is given through the regression analysis of the parameters. The temperature dependence of the modal frequency of the long base isolation structure The influence coefficient curve provides the basis for accurate and reasonable assessment of the performance status of isolated structures.