Considered comprehensively with the friction between structure and soil, study was carried out to simulate the interaction between bottom plate and foundation with contact element. New modelling method for stress calculation of large liquid-storage tank was established. For it, average settlement difference of the foundations was utilized as boundary condition, replacing the existing bedding value and elastic modulus, which are difficult to be measured in practical engineering. The peak stress over fillet weld area on the bottom plate, which was derived by the finite-element analysis modelling method based on settlement difference, agreed well with the measured values. It shows that other than accurately calculating the stress of bottom plate, this method can also carry out real-time monitoring and forecast the operational life span of large liquid-storage tank.
In the past 40 years, more than 7000 layered vessels using flat ribbon-wound cylindrical shells have been manufactured in China. Theoretical as well as experimental investigations show that there are distinct economical and engineering advantages in using such vessels. In this paper, based on the analysis of the heat transfer process in a flat steel ribbon-wound liquid hydrogen high-pressure vessel, a heat transfer model of the walls of the shell and head has been set up. The temperature difference among the interfaces, the heat transfer through the shell and head, and the evaporation rate of the vessel under a steady heat-flow condition has been calculated. The numerical calculations show that such a structure meets the design requirements.
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