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中文摘要：
介绍大跨桥梁动态监测的意义，分析目前大桥监测的现状及各种监测方法的优缺点；叙述GPS动态监测的原理、系统组成、坐标转换及监测注意事项．对苏通大桥进行GPS动态监测试验，采集桥面沿轴线方向、横向及竖向位移数据，并对大桥在温度、风荷、车载等因素影响下的运营期大桥响应情况进行分析．表明大桥轴线方向位移与温度正相关，1／4跨处相关系数为0．851；竖向位移与温度负相关，1／4跨处相关系数-0．803．对数据进行频谱分析，结果表明：频谱没有明显变化；大桥各方向振幅在安全范围内，运营期的大桥十分健康；GPS动态系统监测结果可靠．
英文摘要：
This paper introduces the dynamic monitoring of long-span bridges, and studies the current status of bridge monitoring and the advantages and disadvantages of various monitoring methods; it also describes the principle of GPS dynamic monitoring, system composition, coordinate transformation and monitoring considerations. GPS dynamic monitoring tests are carried out on Sutong Bridge to collect displacement data of the bridge surface in axis direction, horizontal direction and vertical direction. And the bridge responses to the effect of temperature, wind, vehicle and other factors are examined. The study shows that the displacement of the bridge in axis direction is positively correlated with temperature, and the correlation coefficient is 0. 859 at one quarter of the span; however, the vertical displacement is negatively related to temperature, the correlation coefficient being-0. 859 at one quarter of the span. The data is analyzed by using frequency spectrum analysis, and the results indicate that frequency spectrum shows no marked changes; the amplitudes in all directions are within a safe range; the bridge over the term of operation is safe and sound; the monitoring results of GPS dynamic system is reliable.
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