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随着国内LNG需求量的逐渐增大,对LNG混凝土储罐的高容积和安全性提出了更高的要求。借助于ANSYS有限元软件,对泄放阀火灾作用下LNG混凝土储罐罐顶端部分的高温力学性能进行了分析研究。分析中除了考虑由温度引起的材料力学性能劣化效应,还在考虑了瞬态热应变的影响。以16万m3混凝土储罐为例,给出了泄放阀火灾作用下LNG混凝土储罐罐顶和钢质穹顶的温度场和温度应变的分布情况。结果表明:泄放阀火灾作用仅在罐顶和罐壁顶端产生影响;通过温度和温度应力的分布情况,可校核火焰的位置和高度;在计算分析中确定的最高温度处应预埋热电偶,以便于实时监测混凝土的最高温度。分析结果对于提高我国大型LNG预应力混凝土储罐的设计水平具有一定的参考价值。
With the gradual increase of domestic LNG demand, higher requirements for the high volume and safety of LNG concrete storage tanks are put forward. With the aid of ANSYS finite element software, the high temperature mechanical properties of the top part of LNG concrete storage tank under the action of the discharge valve fire were analyzed. In addition to considering the material temperature by the mechanical properties of the degradation effect, but also consider the impact of transient thermal strain. Taking the 160,000 m3 concrete storage tank as an example, the distribution of temperature field and temperature strain of LNG concrete tank roof and steel dome under the action of relief valve is given. The results show that the fire effect of the relief valve only affects the top of the tank and the top of the tank wall. The distribution of temperature and temperature stress can check the position and height of the flame. At the highest temperature determined in the calculation and analysis, Even, in order to real-time monitoring of concrete maximum temperature. The results of the analysis have certain reference value for improving the design level of China’s large LNG prestressed concrete storage tank.