某煤矿箱型钢筋混凝土井塔动力特性测试与分析

Test and Analysis of Dynamic Characteristics of Box-reinforced Reinforced Concrete Shaft Tower in Coal Mine

结构动力特性是既有建筑结构安全性与抗震性能评估的重要参数,通过环境激励法对拟改造箱型钢筋混凝土煤矿井塔的结构动力特性进行现场检测,同时采用有限元方法进行计算分析。结果表明:通过对既有煤矿井塔结构的动力特性进行实测,结构现有刚度能够满足原设计要求,结构自服役以来刚度未发生明显退化,实测结构平动振型与计算结果基本吻合,且未发现明显异常;检测结果可以验证计算方法和计算结果的准确性,为既有工程结构安全性评估和抗震验算提供依据,为后期扩能改造提供技术支撑。

Structural dynamic characteristics are important parameters for evaluating the safety and seismic performance of existing building structures.The on-site evaluation of the structural dynamic characteristics of the box-reinforced concrete coal mine shaft tower by ambient excitation method was conducted.In the meantime,the finite element method for calculation and analysis was also carried out.The results show that the accuracy of theoretical calculation results can be verified by measuring the dynamic characteristics of existing coal mine shaft towers,the actual stiffness of the structure can meet the design requirements,and the stiffness degradation effect of the structure is relatively weak since its service.The measured translational vibration patterns are in good agreement with the calculated results and no obvious anomalies are found.The test results can verify the accuracy of the calculation method and results,provide a basis for the safety assessment and seismic checking calculation of existing engineering structures and provide technical support for the later capacity expansion transformation.