【摘要】 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。更多还原

【Abstract】 In order to study the temperature field in high-strength concrete box girder of a long span continuous rigid frame bridge and to compare the measured value with the theoretical value calculated by the present method,based on Dong Kang Lu continuous rigid frame bridge in Ordos City,the hydration heat data from the temperature measuring points of the zero block were collected,and a finite element model was established with MIDAS / FEA according to the Large Volume Concrete Construction Codes( GB50496- 2009). Based on the collected data,the temperature field under the hydration heat of the block was obtained,and the results were compared with the calculated results. After comparing the measured data with the theoretical data,the difference in the maximum temperature was found to be 26 degrees centigrade,and the difference in the time to reach the maximum temperature was 25 hours. Analysis results show that large thermodynamics difference between the high strength concrete used in bridge and the ordinary concrete used in pile caps and dam presents,therefore the zero block of continuous box girder bridge cannot be strictly dealt with inaccordance with the Large Volume Concrete Construction Codes( GB50496-2009).更多还原