To resist the groundwater uplift pressure, the bottom slab of an LNG in- ground storage tank is a thick reinforced concrete slab with a depth of 7 to 10 m. This paper describes the effect of size on the shear…
To resist the groundwater uplift pressure, the bottom slab of an LNG in- ground storage tank is a thick reinforced concrete slab with a depth of 7 to 10 m. This paper describes the effect of size on the shear strength of circular slabs. To verify the effect of size on the shear strength of a thick reinforced concrete slab, experimental studies are conducted on large reinforced concrete circular slabs subjected to distributed loads. The shear strength of a reinforced concrete circular slab without shear reinforcement gradually decreases as the effective depth "d" of the slab increases. From the results of experiments on large slabs, the size effect on the shear strength of a circular slab is inversely proportional to the fourth root of the effective depth. Bottom slabs with depths of 7.4 m and 9.8 m were subjected to full and 85% design pressure. The result showed the validity of the design method.