Piles-induced filtering effect on the Foundation Input Motion |
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| Institution: | 1. Department of Civil Engineering, Second University of Napoli, Aversa (CE), Italy;2. Department of Technologies, University of Napoli Parthenope, Napoli, Italy;1. School of Civil Engineering and Mechanics, Huazhong University of Science and Technology, Wuhan, Hubei 430074, PR China;2. Department of Civil and Environmental Engineering, National University of Singapore, Singapore;1. College of Environmental Science and Technology, Ocean University of China, Qingdao 266100, China;2. Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering, Hohai University, Nanjing 210098, China;3. Priority Research Centre for Geotechnical Science and Engineering, College of Engineering, Science and Environment, The University of Newcastle, Callaghan, NSW 2308, Australia;4. Key Laboratory of New Technology for Construction of Cities in Mountain Area, College of Civil Engineering, Chongqing University, Chongqing 400045, China;5. College of Science and Engineering, Flinders University, Adelaide 5042, Australia;6. Fujian Provincial Key Laboratory of Advanced Technology and Informatization in Civil Engineering, School of Civil Engineering, Fujian University of Technology, Fuzhou 350118, China;1. KU Leuven, Department of Civil Engineering, Kasteelpark Arenberg 40, 3001 Leuven, Belgium;2. KU Leuven, Department of Computer Science, Celestijnenlaan 200A, B-3001 Leuven, Belgium;1. Université de Bordeaux, I2M/dépt. GCE, UMR CNRS 5295, bat. B18, Av des Facultés, 33405 Talence, France;2. LM2SC, Université des Sciences et de la Technologie d’Oran, BP 1505, El M’naouar, 31000 Oran, Algeria |
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| Abstract: | The inertial interaction analysis of a structure founded on piles is conventionally performed by imposing that the Foundation Input Motion is merely that of the free field, thus neglecting the kinematic interaction between piles and soil generated by the passage of seismic waves. This would lead to unnecessary overconservatism in the design, as there is evidence that the free-field motion may be thoroughly filtered out by piles (generally reduced), especially in the case of soft soils, where piles are recurrently required to carry out the total load transmitted by the superstructure and/or to reduce foundation settlements. Results provided from analytical and numerical tools elucidate the crucial aspects controlling the mechanism of filtering effect. Reduced design spectra are also suggested to account for the beneficial effect coming from the piles when the inertial interaction analysis of the superstructure is being performed. |
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