悬挂式储液罐抗震分析

Seismic Analysis of Hanged Storage Tank

针对悬挂式储液罐建立了2种有限元抗震分析模型。模型1为基于Housner模型和ASCE 4-98规则的质量-弹簧模型。该模型将液动压力对容器底部的弯矩等效为侧壁的压力,并通过提高侧壁压力的高度实现等效。模型2是对Housner模型的改进,是通过公式计算液动压力对容器底部的弯矩,并将弯矩直接施加在容器底部。对所建立的2种模型进行了模态求解和谱分析,并对结果进行对比。结果表明,模型1并不适用于悬挂式储液罐的抗震分析,它忽视了容器底部的弯矩在容器底部到支耳之间引起的应力,其应力结果不符合实际且不保守,而模型2的结果更可靠。

Two types of finite element models were established for the seismic analysis of hanged storage tank.The first one was mass-spring model based on Housner model and ASCE 4-98 codes,and the bending moment at the bottom of the container was equivalent to the pressure of the wall through increasing the height of the pressure.The second one was established by improving Housner model,and the bending moment at the bottom of the container was calculated by formula and applied to the bottom of the container.Modal solving and spectrum analysis were performed to obtain the vibration characteristic and stress distribution of tank,and the results were compared.The results show that the first model can not be applied to the hanged storage tank because of the loss of the stress causing by the moment at the bottom between the vessel bottom and the ear,and the stress results are not realistic and not conservative.The second model is more reliable.