梁式承台大体积混凝土水化热温度场工程实测与数值仿真  

Engineering measurement and numerical simulation of hydration heat temperature field of mass concrete for beam bearing platform

作　　者：王琼[1] 陈昌哲 胡志坚[2] 李扬 吴静萍[2] WANG Qiong;CHEN Changzhe;HU Zhijian;LI Yang;WU Jingping(CCCC Second Highway Consultants Co.,Ltd.,Wuhan 430052,China;School of Transportation,Wuhan University of Technology,Wuhan 430063,China)

机构地区：[1]中交第二公路勘察设计研究院有限公司,湖北武汉430052 [2]武汉理工大学交通学院,湖北武汉430063

出　　处：《混凝土》2020年第9期139-143,147,共6页Concrete

基　　金：国家重点研发专项资助项目(2017YFC0806000);江西省创新驱动“5511”项目(20165ABC28001);江西省交通科技项目(2017C0005)。

摘　　要：对于桥梁承台,会因水泥水化热产生较大的热应力,引起混凝土开裂,影响承台的耐久性。针对宝丰路高架桥25号梁式承台,考虑冷却水管的作用,详细介绍了承台水化热温度场中混凝土参数的取值与边界条件的确定方法,采用CFD方法,对承台混凝土浇筑后的温度场进行了数值仿真,并与工程实测进行了对比。研究表明:冷却水管的温控方案能有效控制混凝土水化热温度场的内部最高温度、内表温差、降温速率;承台中心处出现温度最大点,实际工程中应给予重视;采用CFD方法的数值仿真结果与工程实测结果吻合程度较好,可以适用于计算大体积混凝土的水化热温度场。For bridge beam bearing platform,the cement hydration heat will produce large thermal stress,which will cause concrete cracking and affect the durability of the bearing platform.Considering the effect of cooling water pipes,the method of determining the concrete parameters and boundary conditions in the hydration heat temperature field of the bearing platform is introduced in detail for the beam-type bearing platform of No.25 Baofeng Road viaduct.The CFD method is adopted to carry out numerical simulation on the temperature field of the bearing platform after concrete pouring,and the comparison is made with the actual engineering measurement.Research shows that the temperature control scheme of cooling water pipe can effectively control the internal maximum temperature,internal surface temperature difference and cooling rate of concrete hydration heat temperature field.The maximum temperature appears at the center of the pile cap,which should be paid attention to in practical engineering.The numerical simulation results by CFD method are in good agreement with the engineering measured results,and can be applied to calculate the hydration heat temperature field of mass concrete.

关 键 词：梁式承台 水化热 冷却水管 数值仿真 

分 类 号：TU528.01[建筑科学—建筑技术科学]