Numerical simulation and practical research on the entire process crack control plans of the bearing platform of Changtai Yangtze River Bridge
Numerical simulation of the entire process cracking risk of four anti cracking plans were conducted for the 5# and 6#main tower bearing platform of the Changtai Yangtze River Bridge.The results of plan 1 indicates that cooling water pipes and long-term external insulation measures can effectively control the temperature difference between inside and outside and the risk of cracking during construction,but the long-term cracking risk caused by seasonal temperature changes far exceeds the safety threshold.The results of plan 2 and plan 3 indicate that it is difficult to control the cracking risk of UHPC anti cracking waterproof layer poured on the surface of the bearing platform during the construction period,while the anti-cracking concrete waterproof layer cannot withstand long-term temperature changes.Plan 4 adds the use of anti cracking agents on the basis of plan 1,which can successfully control the risk of cracking throughout the entire process of the bearing platform by compensating for shrinkage.Based on this,plan 4 is selected as the anti cracking plan for the bearing platform and strictly implemented during construction.The temperature and strain monitoring data of the 200 d age of the bearing platform are in line with expectations,and the crack resistance effect is good.
concretebearingcracking riskanti-cracking agentcrack resistance layerannual temperature change
万方数据
维普
