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LNG储罐外罐施工期间的温度应力及裂缝分布

202001-0513:25:47

大型LNG储罐由内罐和外罐组成,内罐采用9%镍钢建造,外罐采用预应力混凝土建造,中间采用膨胀珍珠岩作为隔热层口门。LNG储罐作为储存液化气的压力容器,对外罐混凝土的裂缝具有严格限制,目前国内有不少的LNG储罐外罐在施工期间因过大的温度应力而导致混凝土开裂。虽然早龄期混凝土裂缝在预应力钢绞线张拉后可能会全部或者部分闭合,但在某些工况下,闭合的裂缝有可能再次张开;由于大型LNG储罐一般建在沿海城市,裂缝会破坏钢筋的混凝土保护层,加快对钢筋的腐蚀,严重影响储罐的耐久性及使用寿命。因此,对LNG储罐混凝土外罐的温度应力及裂缝分析意义重大。裂缝产生的主要原因是:混凝土在硬化过程中,水泥水化热使混凝土产生温度变形,而其变形受到内外约束,产生热应力,随着混凝土刚度的不断增加,热应力可能超过混凝土的抗拉强度,导致混凝土开裂。

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