The Influence of Change in Basement Floors （地下室层变化的影响）.pdf

Current World Environment Vol. 10(Special Issue 1), 429-437 (2015) The Influence of Change in Basement Floors Stiffness on the Earthquake Force Distribution across the Height of Concrete Moment Frames AlI GHoDrAT 1, SAyyED MEHDI DEHGHAn BAnADAky 2, 1 1 rEzA rAHMAT kHAH and nASEr kHorSAnD 1Faculty of Engineering, Islamic Azad University of Shiraz, Shiraz, Iran. 2 Department of Civil and Environmental Engineering, Shiraz University of Technology, Shiraz, Iran. /10.12944/CWE.10.Special-Issue1.54 (Received: November, 2014; Accepted: April, 2015) ABSTrACT Today, a large number of residential and commercial buildings in the urban areas include one or several basement floors. The structural system and architecture of the basement floors are generally different, in a way that leads to a significant increase in the stiffness of the basement lateral load resistant system. to understand the impact of this change of stiffness on the seismic behavior of the structures, the two-dimensional concrete rigid frames with 4 and 8 stories and 3 openings are investigated. The performance of these frames was investigated both for no basement and 1, 2 and 3 basement floors conditions. In this study, SAP2000 is used for linear analysis of the models. In order to analyze the response history, 7 ground motions scaled based on static base shear of a frame with no basement were used. For modeling the change in concrete shear of the basement, a concrete shear wall wa