大跨度桥梁强震动数字监测系统的研制

Development of Digital Monitoring System of Strong Motion for Long-Span Bridges

对桥梁进行强震动观测,实时监测桥梁结构的受震动情况,可以达到减轻地震灾害的最终目标.文中基于悬索桥的地震响应分析,探讨了特大桥梁强震动数字监测系统的方案,包括监测断面选择、系统主要技术指标、桥梁强震动预警系统、强震动观测数据处理和报告提交等.该系统可为震后的抗震救灾及各类建筑结构的抗震设计规范等提供准确、定量的地面加速度数据,从而为桥梁的地震灾害预防、工作状态诊断和病害处治提供有效途径.

Both the observation of strong motion of bridges and the vibration monitoring of bridge structures help to reach the final goal of reducing the earthquake disaster. In this paper, based on the earthquake response analyses of cable bridges, the scheme of a digital strong-motion monitoring system for long-span bridges is investigated in terms of the choice of monitoring sections, the main technical indexes, the early-warning system of strong motion, the data processing of observed strong-motion data and the submission of reports, etc. The proposed system not only offers accurate and quantitative ground acceleration data for post-earthquake relief and structural seismic design codes but also provides an effective means for avoiding the earthquake disaster, revealing the working state and removing the hidden danger of bridges.