ABSTRACT To ensure an accurate assessment of the stability of the steel roof during construction of ultra-large LNG storage tanks, real-time monitoring throughout the entire concrete roof pouring process of the world's largest 270,000 cubic meter LNG storage tank was implemented. A computational model for the stability of the steel roof during construction course was established, and the influence of time interval between pours, the holding pressure, and the volume of concrete poured on the stability of the steel roof were studied. The results show that the stability of the steel roof can be enhanced significantly by increasing the time interval between pours within the first eight days after each pouring. Increasing the holding pressure can improve the stability of the steel roof, with more significant effects observed when the time interval between pours is shorter. The volume of concrete poured plays a critical role in structural stability.
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