Flexible pipelines are often used to connect hard pipes from a foundation to a superstructure to accommodate large deformation in the base isolation layer during an earthquake.Although Chinese seismic design guideline...Flexible pipelines are often used to connect hard pipes from a foundation to a superstructure to accommodate large deformation in the base isolation layer during an earthquake.Although Chinese seismic design guidelines suggest several confi gurations,they are diff erent from the designs that have been proven in practice,e.g.,Japanese styles,and extensive experimental investigation into their seismic performance is required.Three types of seals,rubber-,metal-and asbestinebased,were tested quasi-statically with infi lled pressurized water at 2.5 MPa.The asbestine-based seal leaked at a smaller deformation than the other two types of seals.Based on the test results,three damage states were defi ned and the deformation capacity was estimated.To evaluate their performance,a three-dimensional model of a base-isolated medical building was developed using OpenSees,with the fl exible pipelines simulated by a mechanical model calibrated from the experimental data.A probabilistic seismic demand model and the fragility function of the fl exible pipelines were then developed to evaluate the seismic performance.展开更多
基金Scientific Research Fund of Institute of Engineering Mechanics,CEA under Grant Nos.2016A05 and 2016A06the International Science and Technology Cooperation Program of China under Grant No.2014DFA70950the National Natural Science Foundation of China under Grant No.51378478
文摘Flexible pipelines are often used to connect hard pipes from a foundation to a superstructure to accommodate large deformation in the base isolation layer during an earthquake.Although Chinese seismic design guidelines suggest several confi gurations,they are diff erent from the designs that have been proven in practice,e.g.,Japanese styles,and extensive experimental investigation into their seismic performance is required.Three types of seals,rubber-,metal-and asbestinebased,were tested quasi-statically with infi lled pressurized water at 2.5 MPa.The asbestine-based seal leaked at a smaller deformation than the other two types of seals.Based on the test results,three damage states were defi ned and the deformation capacity was estimated.To evaluate their performance,a three-dimensional model of a base-isolated medical building was developed using OpenSees,with the fl exible pipelines simulated by a mechanical model calibrated from the experimental data.A probabilistic seismic demand model and the fragility function of the fl exible pipelines were then developed to evaluate the seismic performance.
