Parametric study for long-span roof truss subjected to vertical ground motion
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ORIGINAL PAPER
Parametric study for long‑span roof truss subjected to vertical ground motion Dhiraj D. Ahiwale1 · Rushikesh R. Khartode1 Received: 9 May 2020 / Accepted: 27 October 2020 © Springer Nature Switzerland AG 2020
Abstract Generally in the seismic resistant design of structures, effects of horizontal ground motions are mainly considered and effects of vertical ground motions (VGMs) are ignored. However, considering the field evidences of damage of structures due to vertical component of ground motion for near-fault earthquakes, the importance of inclusion of effect of vertical component of earthquake in seismic design has been recognized. Therefore in this paper, a parametric study has been carried out on 25 m long-span industrial steel roof truss with the help of 12 near-fault ground motions without pulse. The parameters related to roof truss as well as an earthquake data are studied to get the response of long-span roof truss under vertical ground motion (VGM) with nonlinear time history analysis using SAP2000V19.2.1 software. From the parametric study, it has been realized that for a chosen long-span industrial roof truss, the parameters such as vertical to horizontal peak ground acceleration ratio, axial force, vertical displacement and base bending moment are identified as critical. From the time history analysis results, it is also found that response of truss under vertical ground motion is critical for ground motions having V/H ratio more than 1 and therefore the long-span structure in near-fault zone should be considered separately in design rather than taken as 2/3 of horizontal acceleration as per given in IS1893:2016 (Part-1). Keywords Long-span roof truss frame · Nonlinear time history analysis · Vertical ground motion · SAP2000V19.2.1 · IS1893:2016 (part-1)
Introduction Steel as a structural material is known to have good ductility, strength and uniformity. Being light material and with its ease to use and many other physical properties, steel structures preferred in earthquake-prone regions. Tall and large span steel structures are more economical compared to the concrete structures. The construction of steel structures is very fast, and these can resist very high lateral loads if designed and detailed properly. As the production of steel is under better quality control, the physical properties of the material will be uniform, and the reliability of connections and safety is assured. In the design of earthquake resistant structures, horizontal earthquake forces are mainly considered, and effects of vertical ground motion (VGM) * Dhiraj D. Ahiwale [email protected] 1
Department of Civil Engineering, Vidya Pratishthan’s Kamalnayan Bajaj Institute of Engineering and Technology, Baramati, Pune 413133, India
have long been considered as secondary. However, there are some shreds of evidence which recommend that vertical ground motions have great destructive potential, particularly for near-fault earthquakes. Due to low energy content, vertical ground motions are not considered
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