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Numerical simulation of aqueducts thermal stress during different temperature drop rate and insulation layer thickness design

WANG Hongji;YAN Shilin;YANG Xiaoxiang;LI Yongjing;HE Xu;College of Science,Wuhan University of Technology;Hubei Key Laboratory of Theory and Application of Advanced Materials Mechanics;  
Aiming at a large aqueduct,we use finite element analysis to research the aqueduct thermal stress under different temperature drop rates in winter. In order to study the thermal insulation performance of the layer of vitrified micro bubbles,the transient principal thermal stress of the large aqueduct with different thickness insulation paint are simulated and calculated.Based on the result,we compare the surface thermal stress of the aqueduct with and without insulation layer. The results show that notable thermal stress will occur on the aqueduct surface when the temperature drop rate is larger than 10 degree. By considering the insulation effect and economy,the rational layer thickness should be in 0. 5 ~ 1. 0 cm,which could effectively control the thermal crack of the aqueduct.
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