隔震技术在高烈度区公路监控大厅中的应用

Application of Seismic Isolation Technology in Highway Monitoring Hall in High Intensity Seismic Zone

作为重点设防建筑,位于抗震设防高烈度区的公路监控大厅在灾后修复重建工作中经常承担防灾指挥中心的功能,能够通过其内部的监控设备为震后迅速掌握灾情提供可靠依据。采用隔震技术可有效降低地震对公路监控大厅结构及内部重要设备的破坏,从而保障公路监控系统在震害中正常运行并承担应急救援的重要功能。以实际工程为背景,使用SAP2000软件分别建立了上部结构相同的基础隔震结构与非隔震结构模型,选取3条地震波对结构进行动力特性分析。根据层间剪力比确定水平向减震系数,从而选取相应抗震措施,并根据边跨铅芯橡胶支座的滞回曲线饱满程度判断支座耗能。结果表明:通过对隔震前、后上部结构工程量分别进行统计与对比,从全生命周期的角度分析,隔震结构可节约建设及维护成本;对于抗震设防高烈度区的公路监控建筑采取隔震设计可提高生命线工程的结构安全可靠性,并有效保障公路监控、监测设备在震害中可继续使用,承担灾后救援功能。

The highway monitoring hall located in the high intensity seismic defense zone is a key defense building,which often assumes the function of disaster prevention and command center in post-disaster restoration and reconstruction work.The highway monitoring hall can provide the reliable basis for quickly grasping the disaster situation after earthquake through the internal monitoring equipment.The seismic isolation technology can effectively reduce the damage to structure and internal important equipment of highway monitoring hall.Therefore,the highway monitoring system can ensure the normal operation in earthquake disaster and assume the important function of emergency rescue.With the background of actual project,the base-isolated structure and non-isolated structure models with same superstructure were established by using SAP2000 software.Three seismic waves were selected for analyzing the dynamic characteristics of structure.The horizontal damping coefficient was determined according to the interstory shear ratio,so as to select the corresponding seismic measures.The energy consumption of bearings was determined according to the fullness of hysteresis curve of lead-core rubber bearing located at side span.The result indicates that through the statistics and comparison of superstructure engineering quantity before and after seismic isolation,the full life cycle analysis is made,and the isolation structure can save construction and maintenance costs.Therefore,adopting seismic isolation design for highway monitoring buildings in high intensity seismic zone can improve the structural safety and reliability of lifeline projects.It effectively guarantees that the highway monitoring and monitoring equipment would continue to be used in the earthquake disaster,and undertake the function of disaster relief.