摘要:
为研究大型液化天然气(Liquefied Natural Gas,简称LNG)混凝土全容储罐罐壁-环梁节点的受力与抗震性能,以某16万m3LNG混凝土全容储罐为原型进行罐壁-环梁节点模型试验,采用低周往复荷载作用的拟静力试验研究其承载力、破坏模式、刚度以及耗能能力。结果表明:16万m3LNG混凝土全容储罐罐壁-环梁节点在罐壁破坏时未发生破坏,符合大型混凝土结构"强节点"的设计原理,但结构耗能能力较差,破坏前耗能系数最大为0.685,破坏时残余割线刚度为0.878 kN/mm,刚度退化系数为0.17,残余刚度较小。
Abstract:
In order to research the stress and seismic performance of joints between the tank wall and ring beam of large-scale liquefied natural gas (LNG) concrete full-capacity storage tanks,a 160 000 m3LNG concretefull-capacity storage tank was used as a prototype to conduct model test.The bearing capacity, failure mode, stiffness and energy dissipation capacity were studied by quasi-static test.The results showed that the joint between the tank wall and ring beam of the 160 000 m3LNG concrete full-capacity storage tank was not damaged when the tank wall was damaged, which conformed to the design principle of "strong joint" for large-scale concrete structures. However,the energy dissipation capacity of the structure was poor, the maximum energy dissipation coefficient before failure was 0.685, the residual secant stiffness was 0.878 kN/mm, the stiffness degradation coefficient was 0.17, and the residual stiffness was small.