Analysis On The External Walls Of The Prestressed Concrete LNG Storage Tank Under Seismic Response

With liquefied natural gas (hereinafter referred to as LNG), as well as the rapid growth of demand for energy, the strategic reserve requirements, reserves for LNG demand increasing number of containers, is currently the most widely used in LNG storage tanks are prestressed structure. Reasonable calculation of prestressed LNG storage tank at a variety of load bearing internal force and deformation has become an urgent requirement for designers.China's LNG storage tank for the cylindrical prestressed applications are becoming increasingly widespread, and its current lack of domestic detail and systematic theoretical analysis and research, especially against the power of its analysis of domestic research at little.In this paper, LNG storage tank 50000m3 prestressed concrete external walls of power analysis simulation of seismic response, the main job is as follows:1. The use of ANSYS finite element software, set up the classic shell theory applied to the cylindrical wall of prestressed concrete LNG storage tank of finite element model. Select a reasonable simulation of tank units and the concrete entities tendons stroke unit. Through two units of mutual coupling, using integrated method to simulate the cooling unit in the physical effects of prestressing tendon. Prestressed LNG through the cylindrical tank wall model calculation and analysis of internal forces, access to the internal force distribution of the tank wall and the maximum internal force of the location and size. Preliminary understanding of prestressed cylindrical LNG storage tank at hydrostatic pressure force characteristics, in order to prepare to do power analysis.2. In the LNG storage tank cylindrical prestressed modal analysis of concrete walls, using the dynamic liquid pressure equivalent to the external walls and the tank with the same acceleration of the added mass to obtain the external walls of the tank natural frequency. Calculated analysis of the tank filled with liquid natural frequency than the empty self-vibration frequency is low; prestressed tank wall effect on the impact of natural frequencies.3. Taft used artificial wave in two waves and seismic waves of prestressed cylindrical LNG storage tank for seismic response analysis. Dynamic fluid pressure by the analytical solution with the seismic loads imposed on the structure, implementation of the cylindrical wall of prestressed concrete LNG storage tank at Taft artificial wave-wave and the role of two types of seismic waves under the time-history analysis. Calculation of waveform analysis of seismic waves generated by different dynamic fluid pressure, as well as the structure of the two waveforms on the impact of internal forces. For the actual project and provide a theoretical basis and numerical analysis.