Variable curvature friction pendulum bearings(VCFPB)effectively reduce the dynamic response of storage tanks induced by earthquakes.Shaking table testing is used to assess the seismic performance of VCFPB isolated sto...Variable curvature friction pendulum bearings(VCFPB)effectively reduce the dynamic response of storage tanks induced by earthquakes.Shaking table testing is used to assess the seismic performance of VCFPB isolated storage tanks.However,the vertical pressure and friction coefficient of the scaled VCFPB in the shaking table tests cannot match the equivalent values of these parameters in the prototype.To avoid this drawback,a real-time hybrid simulation(RTHS)test was developed.Using RTHS testing,a 1/8 scaled tank isolated by VCFPB was tested.The experimental results showed that the displacement dynamic magnification factor of VCFPB,peak reduction factors of the acceleration,shear force,and overturning moment at bottom of the tank,were negative exponential functions of the ratio of peak ground acceleration(PGA)and friction coefficient.The peak reduction factors of displacement,acceleration,force and overturning moment,which were obtained from the experimental results,are compared with those calculated by the Housner model.It can be concluded that the Housner model is applicable in estimation of the acceleration,shear force,and overturning moment of liquid storage tank,but not for the sliding displacement of VCFPBs.展开更多
为了研究桩土对16×104m3全容式LNG储罐基础隔震地震响应的影响,基于ADINA建立有限元模型,外罐体采用三维实体单元,内罐采用壳单元,流体采用势流体单元,桩土与隔震层采用弹簧阻尼单元,在0.34 g El Centro地震动激励下,应用时程分析...为了研究桩土对16×104m3全容式LNG储罐基础隔震地震响应的影响,基于ADINA建立有限元模型,外罐体采用三维实体单元,内罐采用壳单元,流体采用势流体单元,桩土与隔震层采用弹簧阻尼单元,在0.34 g El Centro地震动激励下,应用时程分析方法进行地震响应分析,并与理论解进行对比。结果表明:桩土作用下LNG储罐基础隔震地震响应减震效果明显,但晃动波高有所放大;基础隔震对于减小内罐的地震反应优于外罐;理论解和有限元解相比总基底剪力、总基底弯矩较为接近;从反映实际情况出发,有限元解是可行的。展开更多
基金Scientific Research Fund of Institute of Engineering Mechanics,China Earthquake Administration under Grant No.2018D03the National Natural Science Foundation of China under Grant Nos.51608016 and 51421005。
文摘Variable curvature friction pendulum bearings(VCFPB)effectively reduce the dynamic response of storage tanks induced by earthquakes.Shaking table testing is used to assess the seismic performance of VCFPB isolated storage tanks.However,the vertical pressure and friction coefficient of the scaled VCFPB in the shaking table tests cannot match the equivalent values of these parameters in the prototype.To avoid this drawback,a real-time hybrid simulation(RTHS)test was developed.Using RTHS testing,a 1/8 scaled tank isolated by VCFPB was tested.The experimental results showed that the displacement dynamic magnification factor of VCFPB,peak reduction factors of the acceleration,shear force,and overturning moment at bottom of the tank,were negative exponential functions of the ratio of peak ground acceleration(PGA)and friction coefficient.The peak reduction factors of displacement,acceleration,force and overturning moment,which were obtained from the experimental results,are compared with those calculated by the Housner model.It can be concluded that the Housner model is applicable in estimation of the acceleration,shear force,and overturning moment of liquid storage tank,but not for the sliding displacement of VCFPBs.
文摘为了研究桩土对16×104m3全容式LNG储罐基础隔震地震响应的影响,基于ADINA建立有限元模型,外罐体采用三维实体单元,内罐采用壳单元,流体采用势流体单元,桩土与隔震层采用弹簧阻尼单元,在0.34 g El Centro地震动激励下,应用时程分析方法进行地震响应分析,并与理论解进行对比。结果表明:桩土作用下LNG储罐基础隔震地震响应减震效果明显,但晃动波高有所放大;基础隔震对于减小内罐的地震反应优于外罐;理论解和有限元解相比总基底剪力、总基底弯矩较为接近;从反映实际情况出发,有限元解是可行的。
