PSI - Issue 18

Available online at www.sciencedirect.com Structural Integrity Procedia 00 (2019) 000 – 000 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2019) 000 – 000 Available online at www.sciencedirect.com ScienceDirect

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Procedia Structural Integrity 18 (2019) 108–118

25th International Conference on Fracture and Structural Integrity Effect of near and far Field Earthquakes on performance of various base isolation systems Bilal L. Khan a , Muhammad Azeem a , Muhammad Usman a , Syed H. Farooq b , Asad Hanif * c , Muhammad Fawad a a School of Civil and Environmental Engineering, National University of Science and Technology, Sector H-12, Islamabad Pakistan b Civil Engineering Department, National University of Technology (NUTECH), Sector I-12, Islamabad, Pakistan c Institute of Applied Physics & Materials Engineering, University of Macau, Avenida da Universidade, Taipa, Macau S.A.R China Civil engineering infrastructures are prone to natural disasters like earthquakes, floods and strong winds. Base isolation is one of the effective structural controlling technique for protection of structure during earthquake events. The concept of Base isolation is to insert a flexible layer between foundation and superstructure thus decoupling the building from damaging action of ground motion. This modifies the dynamic characteristics of the system. This paper presents comparative study of near and far field earthquakes on the performance of three types of passive base isolators namely High Damping Rubber bearing (HDRB, Damping Ratio: 13%), Low Damping Rubber Bearing (LDRB; Damping Ratio: 3%) and Lead Core Rubber Bearing (LCRB, Damping Ratio: 25%). For this purpose, an 8-storey structure has been analyzed using state space approach in MATLAB. Parameters like peak global drift, inter-storey drift, transmissibility of acceleration are compared for various base isolation systems under near and far field earthquakes. It is concluded that the dynamic response of the structure depends on the source of excitation and designer must consider this effect for efficient design. Moreover, the damping of the base isolator should be so adjusted that both the deformation and transmissibility ratio are minimized or in some cases a combination of different dampers may be used. 25th International Conference on Fracture and Structural Integrity Effect of near and far Field Earthquakes on performance of various base isolation systems Bilal L. Khan a , Muhammad Azeem a , Muhammad Usman a , Syed H. Farooq b , Asad Hanif * c , Muhammad Fawad a a School of Civil and Environmental Engineering, National University of Science and Technology, Sector H-12, Islamabad Pakistan b Civil Engineering Department, Natio al Univers ty of Technology (NUTECH), Sector I-12, Islamabad, P kistan c Institute of Applied Physics & Materials Engineering, University of Macau, Avenida da Universidade, Taipa, Macau S.A.R China Abstract Civil engin ering infrastructures ar prone to natural disasters like earthquakes, floods and strong winds. Base isolation is one of the effective structural controlling technique for protection of structure uring earthquake events. The concept of Base isolati n is to insert a flexible layer between foundation and superstructure thus decoupling the building from damaging action of groun motion. This modifi s the dynamic characteristics of the system. This paper presents comparative study of near and f r field earthquakes on the performance of three types of passive base isolators namely High Damping Rubber b ri (HD , i ti : 13 ), Low Damping Rubber Bearing (LDRB; Damping Ratio: 3%) and Lead Core Rubber Bearing (LCRB, Damping Ratio: 25%). For this purpose, an 8-storey structure has be n analyzed using state space approach in MATLAB. Parameters like peak global drift, inter-storey drift, transmissibility of acceleration are compared for various base isolation systems under near and far field earthquakes. It is concluded that the dynamic r sponse of the structure depends on the source of excitation and designer must consider this effect for efficient design. Moreover, the damping of the base isolator should be so adjusted that both the deformation and transmissibility ratio are minimized or in some cases a combination of different dampers may be used. Abstract

© 2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Gruppo Italiano Frattura (IGF) ExCo. © 2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Gruppo Italiano Frattura (IGF) ExCo. © 2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Gruppo Italiano Frattura (IGF) ExCo. Keywords: Base Isolation systems, Earthquake, Near & Far Field Earthquake, Buildings Keywords: Base Isolation systems, Earthquake, Near & Far Field Earthquake, Buildings

* Corresponding author. E-mail address: ahanif@connect.ust.hk * Correspon ing author. E-mail address: ahanif@connect.ust.hk

2452-3216 © 2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Gruppo Italiano Frattura (IGF) ExCo. 2452-3216 © 2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Gruppo Italiano Frattura (IGF) ExCo.

2452-3216  2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Gruppo Italiano Frattura (IGF) ExCo. 10.1016/j.prostr.2019.08.145