大面积混凝土板跳仓法温度场模拟研究  

Simulation study of temperature field of large area concrete slab by alternate segment concrete pouring

作　　者：王雅文 WANG Yawen(China Northeast Architecture Design Institute of Xiamen Co.,Ltd.Xiamen 361000)

机构地区：[1]厦门中建东北设计院有限公司,福建厦门361000

出　　处：《福建建筑》2024年第3期42-47,共6页Fujian Architecture & Construction

摘　　要：目前,对跳仓法温度场的数值模拟大多考虑水泥水化热影响,忽略了不均匀温度场和养护条件对温度场的影响,而对仓段尺寸的划分主要采用经验法。为进一步研究,采用ABAQUS中的HETVAL和FILM子程序,对跳仓法下混凝土板的温度场进行模拟,同时考虑混凝土早龄期水化放热特性、施工环境温度、施工顺序和施工时间间隔等方面影响。结果显示,编制的温度场计算程序具有较好的适用性;板厚、环境温度对温度梯度的影响较大,浇筑顺序和浇筑时间间隔对早龄期温度有一定的影响,为此对跳仓法提出了相应设计施工建议。基于混凝土板内最大温度变化值,构建了跳仓法施工下最大一次浇筑长度计算公式,以混凝土开始出现裂缝时的拉伸应变作为判断依据,得到了不同工况下跳仓法单次浇筑最大长度。At present,most of the numerical simulations of the temperature field of alternate segment concrete pouring method consider the effect of heat of hydration of cement,ignoring the effect of inhomogeneous temperature field and curing conditions on the temperature field.The empirical method is mainly used for the division of the pour size.HETVAL and FILM subroutines in ABAQUS were used to simulate the temperature field of concrete slabs under the alternate segment concrete pouring,taking into account the effects of hydration and exothermic properties of concrete at early ages,construction ambient temperature,construction sequence and construction time interval,etc.The results show that the prepared temperature field calculation program has good applicability.The slab thickness and ambient temperature have great influence on the temperature gradient,and the pouring sequence and pouring time interval have influence on the early age temperature.The corresponding design and construction opinions are put forward for alternate segment concrete pouring method.The formula for calculating the maximum length of a single pour under the alternate segment concrete pouring method was constructed,which based on the maximum temperature change in the concrete slab and the tensile strain at the beginning of concrete cracks.The formula was used for obtaining the maximum length of a single pour under the alternate segment concrete pouring method.

关 键 词：跳仓法 数值模拟 ABAQUS 温度场 单次浇筑最大长度 

分 类 号：TU3[建筑科学—结构工程]