预应力混凝土连续刚构桥梁施工监控技术分析与有限元模拟研究
Analysis of Construction Monitoring Technology and Finite Element Simulation of Prestressed Concrete Continuous Rigid Frame Bridge

为确保预应力混凝土连续刚构桥梁在施工阶段的结构安全性和合理性，本文首先对桥梁进行了长达两年的施工监控。随后，根据监控数据，对实测的桥梁线形和应力变化情况与有限元模拟值进行了详细对比分析，并分析了承台的沉降结果和温度观测数据。研究结果表明：在施工阶段，实测的桥梁线形与有限元模拟值高度一致，相关性系数达到0.99；实测的应力结果与有限元模拟值相符，最大偏差仅为1.96 MPa，并且未观察到拉应力的出现；承台在观测期间内表现出较小的沉降量，所有观测值均在10 mm以内，并且沉降量呈现逐渐减缓的趋势；混凝土温度表现出与气温类似的逐时周期变化，混凝土温度极值的出现时间略滞后于气温，通常在凌晨7时左右达到最低点，滞后时间约为1.5小时；虽然混凝土温度随气温波动，但其日变化幅度远小于气温的变化幅度，这主要归因于混凝土的热惰性特性。此外，本文对于预应力混凝土连续刚构桥梁的施工管理和监控提供了重要的实测与模拟数据，进一步验证了有限元模拟方法在工程实践中的有效性和准确性。
To ensure the structural safety and rationality of prestressed concrete continuous rigid frame bridges during the construction phase, this study first conducted a two-year construction monitoring of the bridge. Subsequently, based on monitoring data, a detailed comparative analysis was conducted between the measured bridge alignment and stress changes and the finite element simulation values, and the settlement results and temperature observation data of the bearing platform were analyzed. The research results indicate that during the construction phase, the measured bridge alignment is highly consistent with the finite element simulation values, with a correlation coefficient of 0.99. The measured stress results are consistent with the finite element simulation values, with a maximum deviation of only 1.96 MPa, and no tensile stress was observed. During the observation period, the abutment showed a small settlement, with all observed values within 10 mm, and the settlement showed a gradually decreasing trend. The temperature of concrete exhibits a periodic change similar to that of air temperature, with the appearance of the extreme temperature of concrete slightly lagging behind the temperature, usually reaching its lowest point around 7 a.m., with a lag time of about 1.5 hours. Although the temperature of concrete fluctuates with temperature, its daily variation is much smaller than that of temperature, which is mainly attributed to the thermal inertness characteristics of concrete. In addition, this article provides important measured and simulated data for the construction management and monitoring of prestressed concrete continuous rigid frame bridges, further verifying the effectiveness and accuracy of the finite element simulation method in engineering practice.