Abstract
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 configurations, they are different 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 asbestine-based, were tested quasi-statically with infilled 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 defined 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 flexible pipelines simulated by a mechanical model calibrated from the experimental data. A probabilistic seismic demand model and the fragility function of the flexible pipelines were then developed to evaluate the seismic performance.
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Acknowledgement
This research was funded by Scientific Research Fund of Institute of Engineering Mechanics, CEA (2016A05 and 2016A06), the International Science and Technology Cooperation Program of China (2014DFA70950), the National Natural Science Foundation of China (51378478), and the Program for Innovative Research Team in China Earthquake Administration. Any opinions, findings and conclusions or recommendations expressed herein are those of the authors and do not necessarily reflect the views of the sponsors.
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Supported by: Scientific Research Fund of Institute of Engineering Mechanics, CEA under Grant Nos. 2016A05 and 2016A06, the International Science and Technology Cooperation Program of China under Grant No. 2014DFA70950, the National Natural Science Foundation of China under Grant No. 51378478
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Shang, Q., Wang, T. & Li, J. Seismic fragility of flexible pipeline connections in a base isolated medical building. Earthq. Eng. Eng. Vib. 18, 903–916 (2019). https://doi.org/10.1007/s11803-019-0542-5
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DOI: https://doi.org/10.1007/s11803-019-0542-5