DEVELOPMENT OF INTELLIGENT SENSING AND SMART MONITORING TECHNIQUE FOR SEISMIC SAFETY OF BRIDGE

为了实现桥梁结构的智能化，在结构内部安装光纤传感器和应变片的同时，布置了可以测量桥梁上位移和加速度的传感器，并证明可以通过无线遥控获取数据；基础隔震桥梁可以进行长周期的设计，抑制地震力的作用；如果桥梁的上部结构在大地震时超过结构和桥台之间的铺设间隙，就会与女儿墙相撞。当结构没有桥梁防坠落系统时，坠落是不可避免的。为了保证连续曲线桥梁的抗震安全，对桥端减震材料进行了检测，并结合实际桥梁设计，在连续曲线桥梁上布置了完美的双向减震支座LRB(含铅芯铅芯橡胶支座)，取得了良好的效果。为了验证GPS传感器对桥梁健康监测的有效性，在人行道悬索桥和连续梁桥上安装了GPS传感器，验证了障碍物等因素对测量精度的影响，研制了基于压电式致动器的桥梁结构缺陷检测系统。通过压电作动器可以引入结构的局部振动，测量结构的加速度响应。利用结构振动响应的变化可以检测出结构缺陷，并应用于结构健康监测，为利用移动终端的桥梁检测支撑系统开发了远程监控技术。

In order to make bridge structure intelligent, while having arranged the optical fiber sensor (FBG) and the strain gage inside structure, the sensor that can measure displacement and acceleration on a bridge has been arranged, and it was proved that data could be acquired by wireless remote control.A base-isolated bridge may carry out the design that forms a long cycle and suppresses action of seismic force.If superstructure movement of a bridge exceeds a laying gap between structure and abutment in case of a big earthquake, it will collide with a parapet wall. When structure does not have falling prevention system of bridge, falling is inevitable. In order to secure seismic safety, examination of the shock absorbing material in a bridge end and the real bridge design which has arranged perfect quake-absorbing LRB (the seismic isolation bearing containing a lead plug, Lead Rubber Bearing) for two directions on the continuous curvilinear bridge were done, and the good result was obtained.In order to prove the health monitoring of the bridge using a GPS sensor, the GPS sensor was installed on the sidewalk suspension bridge and the continuous girder bridge, and the influence of measurement accuracy by an obstacle etc. was verified.The defect detection system of bridge structure using a piezoelectric actuator was developed. Local vibration of the structure can be introduced by the piezoelectric actuator, the acceleration response can be measured. A structural defect can be detected from change of an oscillating response, and it can apply to the monitoring of structure health.The monitoring technology by remote control was developed for the bridge inspection support system which utilized the mobile terminal.