Seismic Performance of Outrigger-Braced System Based on Finite Element and Component-Mode Synthesis Methods
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RESEARCH PAPER
Seismic Performance of Outrigger‑Braced System Based on Finite Element and Component‑Mode Synthesis Methods Reihaneh Tavakoli1 · Reza Kamgar2 · Reza Rahgozar1 Received: 1 September 2018 / Accepted: 23 July 2019 © Shiraz University 2019
Abstract Determining the optimum location of outrigger-belt truss system is of the most important challenges in tall structures. In this paper, two numerical methods, finite element method (FEM) and component-mode synthesis (CMS), are evaluated to determine the seismic performance of two buildings with different heights: one with 20 stories and the other with 30 stories. To find the optimum location of the outrigger, seismic performance of 2D outrigger-braced buildings in terms of inter-story drift ratio, roof displacement, base shear, and base moment is investigated. It is concluded that CMS as a model reduction method is very effective and useful in reducing the required analysis time as well as having good concordance with FEM results. The seismic responses of the two buildings change significantly as the outrigger location changes from the first to the last story. The accuracy of the results is verified through the OpenSees program. Results show that the component-mode synthesis method is able to reduce the analysis time significantly, and also the efficiency and impotence of this method are more obvious as degrees of freedom are increased. In addition, placing the outrigger system at 0.6H to 0.8H of the total height of the building improves the seismic performance of the structure. Keywords Finite element method · Component-mode synthesis · Tall building · Outrigger-braced frame
1 Introduction Earthquake or wind may cause lateral forces, which, in turn, seem to be very significant in designing high-rise and medium–high-rise structures; therefore, to prevent structural and nonstructural damage, controlling and minimizing lateral deflection is crucial. To do so, an effective technique is to use a central core and horizontal outriggers which connect the central core to the exterior columns. Adding belt truss to this system assists in restraining the outriggers and bending of the shear core by engaging the exterior columns and, consequently, decreases the lateral displacement and * Reza Rahgozar [email protected] Reihaneh Tavakoli [email protected] Reza Kamgar [email protected] 1
Department of Civil Engineering, Shahid Bahonar University of Kerman, Kerman, Iran
Department of Civil Engineering, Shahrekord University, Shahrekord, Iran
2
bending moment at the base of the structure (Brunesi et al. 2016; Hoenderkamp and Bakker 2003; Kamgar and Rahgozar 2013; Kamgar and Saadatpour 2012). Finding the best location of an outrigger and belt truss system is one of the most important challenges in tall structures, with the objective to decrease lateral displacement at the top of the building and bending moment at the base of the structure (Tavakoli et al. 2018; Tavakoli et al. 2019). Smith and Salim (1983) applied multiple regression analysis to the results o
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