摘要
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。
The responses （e.g. bearing initial displacement） and dynamic characteristics （e.g. modal frequency） of long irregular base-isolated structures （BIS） vary with environmental temperature variation. Based on monitoring data including the temperature of isolation layers, horizontal displacement of isolation bearings and acceleration response data of the superstructure of a long irregular BIS, the rule of horizontal displacement of isolation bearing and dynamic characteristics affected by environmental temperature variation are investigated.The mechanism of environmental temperature＇s effects on the horizontal displacement of isolation bearing and dynamic characteristics of BIS is analyzed theoretically. The dependency between the horizontal displacement of isolation bearing and environmental temperature is studied. Meanwhile, combining the conclusion of the dependency experiments of isolation bearing with temperature variation, the results of the dependency analysis of environmental temperature＇s effects on the dynamic characteristics of BIS are validated. The results show that the environmental temperature and the horizontal displacement of isolation bearing showed relatively strong dependency. The conclusion of dependency analysis using monitoring data is consistent with the dependency experiments of isolation bearings. Finally, the dependency models of the horizontal displacement of isolation bearings and modal frequency with environmental temperature variation and the curves of influence coefficients of environmental temperature affected on modal frequency are proposed. The basis of assessing the performance of BIS reasonably and accurately is laid.
出处
《工程力学》
EI
CSCD
北大核心
2017年第7期69-78,共10页
Engineering Mechanics
基金
国家自然科学基金项目(51578274
51178211
51568041)
关键词
基础隔震结构
结构健康监测
温度相关性
隔震支座水平位移
模态频率
base-isolated structure
structural health monitoring
temperature dependency
isolation bearing horizontal displacement
modal frequency
