tailieunhanh - Optimum seismic design of short to mid rise steel moment resisting frames based on uniform deformation theory

In current work, an effective method is introduced for the optimal cross-section distribution in steel moment resisting frames under severe earthquakes by means of uniform deformation theory and adaptive method. The main goal is to distribute the construction material (weight) along the height of the structure in such a way that the lowest damage due to earthquakes is obtained. In adaptive method, materials gradually transfer from strong parts to weak parts by an iteration procedure during nonlinear time history analysis. | JSEE Vol. 19, No. 1, 2017 This is an extended version of the paper presented in SEE7 conference, peer-reviewed again and approved by the JSEE editorial board. Optimum Seismic Design of Short to Mid-Rise Steel Moment Resisting Frames Based on Uniform Deformation Theory Hassan Moghaddam1 and Seyed Mojtaba Hosseini Gelekolai 2* 1. Professor, Department of Civil Engineering, Sharif University of Technology, Tehran, Iran 2. . Candidate, Department of Civil Engineering, Sharif University of Technology, Tehran, Iran, *Corresponding Author; email: hosseini@ Received: 07/11/2015 Accepted: 20/07/2016 ABSTRACT Keywords: Seismic design; Optimization; Uniform deformation theory; Steel moment resisting frames; Nonlinear dynamic analysis In current work, an effective method is introduced for the optimal cross-section distribution in steel moment resisting frames under severe earthquakes by means of uniform deformation theory and adaptive method. The main goal is to distribute the construction material (weight) along the height of the structure in such a way that the lowest damage due to earthquakes is obtained. In adaptive method, materials gradually transfer from strong parts to weak parts by an iteration procedure during nonlinear time history analysis. In order to demonstrate the effectiveness of the proposed method, the optimal distribution of the cross-sections is obtained for 5 and 10 story steel moment resisting frames. In order to reduce the sensitivity of the optimal response to discrete cross-sections, continuous crosssections fitted between DIN-Standard cross-sections have been used in order to achieve its optimal state. The steel moment resisting frames are optimized under five natural earthquakes. Results indicate that the optimal frames designed by this method show not only a more uniform deformation under earthquakes, but also less weight in comparison to the original structure designed according to the ASCE07-10 code. The reduction in .