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为研究大跨径连续刚构桥箱梁零号块高强混凝土水化热温度场变化规律,以及采用现有方法计算所得理论值与实测值的对比。以鄂尔多斯市东康路连续刚构桥主桥为依托工程,对布置温度测点的零号块水化热数据进行采集,并根据《大体积混凝土施工规范》(GB50496-2009)建立MIDAS/FEA有限元数值模型。根据所采数据进行分析,得到该零号块水化热温度场效应规律,并与计算结果进行对比分析。由本实例实测数据与理论数据对比可得,测点最高温度与实测值相差可达26℃,达到最高温度所用时间相差可达25 h。因此,桥梁所用高强混凝土与承台、大坝等所用普通混凝土的热力学性能差别较大,连续刚构桥箱梁零号块不能完全参照《大体积混凝土施工规范》(GB50496-2009)来处理。
In order to study the variation law of temperature field of hydration heat of No. 0 block high-strength concrete box girder of long-span continuous rigid frame bridge, and the comparison between the theoretical and measured values calculated by the existing methods. Based on the project of Dongkang Road continuous rigid frame bridge main bridge in Erdos City, No. 0 block heat hydration data with temperature measuring point was collected and MIDAS / FEA was set up according to “Mass Concrete Construction Code” (GB50496-2009) Finite element numerical model. Based on the collected data, the temperature field effect law of hydration heat of the zero block was obtained and compared with the calculated results. By comparing the measured data with the theoretical data in this example, the difference between the measured maximum temperature and the measured value can reach 26 ° C, and the difference between the time required to reach the maximum temperature can reach 25 hours. Therefore, the difference between the thermodynamic properties of the ordinary concrete used in the bridge and the ordinary concrete used in the caps, dams and so on is quite large. The zero block of the box girder of continuous rigid frame bridge can not be treated completely with reference to the “Code for Construction of Mass Concrete” (GB50496-2009).