A Study on Simulation Models of Seismic Energy Absorbing Steel Pipes

Utomo, Junaedi and Moestopo, Muslinang and Surahman, Adang and Kusumastuti, Dyah (2014) A Study on Simulation Models of Seismic Energy Absorbing Steel Pipes. In: Conference for Civil Engineering Research Network 2014, 4-5 November 2014, Bandung.

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The aim of this study is to develop simulation models of steel pipe as hysteretic dampers for seismic resistant steel structures. Steel pipe dampers are chosen as energy dissipating device because they are easy to install, maintain and inexpensive. Steel pipes in various positions are able to dissipate seismic input energy in a structure through hysteresis of the metal. Numerical simulation is carried out using nonlinear structural analysis program ABAQUS. Cyclic shear loading is applied to: a) vertical steel pipe dampers positioned in the plane of the frame of the structure; and b) horizontal steel pipe dampers positioned perpendicular to the plane of the frame of the structure. Cyclic axial loading is applied to the horizontal steel pipes positioned in the plane of the frame of the structure; in this case the steel pipes are intended to function as stoppers to backup the main damper in absorbing excessive seismic input energy. The following requirements for steel pipe dampers are taken into account: a) dampers provide stiffness and supplement damping to the structure; b) most part of the dampers yield simultaneously; c) dampers have satisfactory ultra low-cycle fatigue (ULCF) capacity. Steel pipes with diameter greater than 100 mm (considered to be useable as dampers) have diameter to thickness ratio more than 20 which is too slender; meaning, steel pipes have less than necessary amount of material to fulfill the above requirements. Various strengthening strategies to bare steel pipes are explored in the simulation models. Ductile fracture in steel that initiates in fewer than twenty constant amplitude loading cycles has been term Ultra Low Fatigue Cycle. Under ULCFs load dampers experienced extensive plasticity and limited cyclicity. ULCF has been treated more as a fracture problem than a fatigue problem in micromechanics-based models, which provide accurate criteria for predicting ductile fracture, proposed by Kanvinde and Deierlein (2007). Ductile fracture controls the ultimate strength and ductility of structural components, therefore accurate preliminary prediction of ductile fracture is critical to the performance of steel pipe dampers. The finite element simulation models can be utilized to preliminary predict ductile fracture in steel pipes using the criteria from the micromechanics-based models. Several results from studying the behavior and preliminary ductile fracture prediction of the models, which show the potential to be developed further into operational hysteretic steel pipe dampers, will be presented

Item Type: Conference or Workshop Item (Paper)
Uncontrolled Keywords: —ductile fracture, micromechanics-based model, steel pipe as hysteretic damper, supplemental damping
Subjects: Sipil > Struktur
Sipil > Struktur
Divisions: Fakultas Teknik > Program Studi Teknik Sipil
Depositing User: Editor UAJY
Date Deposited: 03 Mar 2020 02:43
Last Modified: 03 Mar 2020 02:43
URI: http://e-journal.uajy.ac.id/id/eprint/21509

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