桥墩大体积混凝土水化热试验研究及数值模拟

Experimental Research and Numerical Simulation on Hydration Heat of Bridge Mass Concrete

以广州某大桥节段模型试验为背景,在其桥墩浇筑过程中实测了内部水化热温度场的变化规律,并采用Midas软件对该桥墩混凝土浇筑过程中的水化热温度场进行了有限元仿真,通过仿真结果与实测结果的对比验证了有限元模型的正确性。通过有限元模拟研究了早强混凝土和普通混凝土的水化热温度场差异性以及普通混凝土相比于早强混凝土到达温度峰值时间滞后性的一般规律;并研究了设置冷管循环对大体积混凝土温度场的影响,结果表明,在早强混凝土中设置冷管循环能有效降低大体积混凝土的水化热温度。

Based on the segmental model test of a long span bridge in Guangzhou, the change law of the internal hydration heat temperature field was measured during the casting of the bridge piers, the hydration heat of the concrete construction of the pier was also simulated by using the Midas software, and the comparison between the finite element results and the measured results verified the correctness of the finite element model. Further numerical simulations were conducted to study the differences in the temperature field of hydration heat of early-strength concrete and ordinary concrete, and the general law of the time lag effect corresponding the peak temperature of the ordinary concrete and the early-strength concrete. Additionally, the effect of pipe cooling circulation system on the hydration heat temperature field of the mass concrete was also studied. The results show that setting pipe cooling circulation system in early-strength concrete can effectively reduce the hydration temperature of the mass concrete.