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以16万立方米大型LNG储罐穹顶为例,应用ADINA有限元软件进行LNG储罐穹顶混凝土施工过程的温度场和应力场的耦合分析。从第一次至第四次浇筑温度曲线,梁部温度包络图以及混凝土、板温度包络图可以看出:板温度接近砼的温度,温度随水化热曲线先较快上升,后缓慢下降;节点温度最高值出现在混凝土浇筑后的2～3d内,最大值为57.2℃,最大的温度变化梯度发生在30-60h。环向应力分析证明:梁和板的环向应力受到温度的影响也呈先增大再缓慢减小的变化趋势;最大值出现在混凝土浇筑后30～60h,即出现在温度最高的时刻。
Taking LNG tank dome of 160,000 cubic meters as an example, the coupling analysis of temperature field and stress field of LNG storage tank dome concrete construction is carried out by using ADINA finite element software. From the first to the fourth pouring temperature curve, the envelope of the temperature of the beam and the temperature profile of the concrete and slab, it can be seen that the temperature of the slab approaches the temperature of concrete, the temperature rises rapidly with the heat of hydration curve, and then slowly The maximum value of node temperature appeared in 2 ~ 3d after pouring concrete, the maximum value was 57.2 ℃, the maximum temperature gradient occurred in 30-60h. The hoop stress analysis proves that the circumferential stress of beams and slab also increases first and then decreases slowly when influenced by temperature. The maximum appears in 30 ~ 60h after pouring of concrete, which occurs at the highest temperature.