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大型液化天然气(LNG)储罐外罐负责抵抗内罐可能受到的外部冲击,并收集由于偶然原因从内罐渗漏的LNG,为了确保预应力混凝土外罐具有良好的气密性、液密性和强度,得到合理的预应力筋张拉方案,降低预应力筋张拉失败的风险,以某16×104m3LNG储罐为例,利用ANSYS软件建立外罐混凝土和预应力筋模型,分析4种不同预应力筋张拉方案混凝土外罐的应力及变形规律。数值模拟结果表明:当预应力筋张拉结束时,混凝土外罐在4种张拉方案下的最大变形量基本相同,最大变形出现在水平预应力筋张拉结束时,且以径向变形为主,方案三变形发展相对缓慢,在现场张拉施工作业中,为了避免引起外罐产生附加内力,建议先张拉竖向预应力筋再张拉水平预应力筋。
Large liquefied natural gas (LNG) tank outer tank is responsible for the external tank may be subjected to external shocks, and collected due to accidental leakage of LNG from the inner tank, in order to ensure prestressed concrete outer tank has a good air tightness, liquid tightness And the strength of the prestressing tendons, a reasonable prestressing tendon tensioning scheme is obtained to reduce the risk of prestressing tendon failure. Taking a 16 × 104m3 LNG storage tank as an example, ANSYS software is used to build the concrete cantilever and prestressing tendon model, Stress and Deformation Law of Prestressed Concrete Tensioning Concrete Casing. The numerical simulation results show that when the prestressing tendon tensioning is completed, the maximum deformation of the concrete outer can under the four tensioning schemes is basically the same, and the maximum deformation appears at the end of the horizontal prestressing tendon tensioning and the radial deformation is In the construction of the site, in order to avoid causing additional internal forces in the external tank, it is suggested that the vertical prestressing tendons be pretensioned and the horizontal prestressing tendons should be tensioned again.