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Steel and Composite Structures
  Volume 19, Number 2, August 2015 , pages 263-275

Layout evaluation of building outrigger truss by using material topology optimization
Dongkyu Lee, Soomi Shin, Jaehong Lee and Kihak Lee

    This study presents conceptual information of newly optimized shapes and connectivity of the so-called outrigger truss system for modern tall buildings that resists lateral loads induced by wind and earthquake forces. In practice, the outrigger truss consists of triangular or Vierendeel types to stiffen tall buildings, and the decision of outrigger design has been qualitatively achieved by only engineers\' experience and intuition, including information of structural behaviors, although outrigger shapes and the member\'s connectivity absolutely affect building stiffness, the input of material, construction ability and so on. Therefore the design of outrigger trusses needs to be measured and determined according to scientific proofs like reliable optimal design tools. In this study, at first the shape and connectivity of an outrigger truss system are visually evaluated by using a conceptual design tool of the classical topology optimization method, and then are quantitatively investigated with respect to a structural safety as stiffness, an economical aspect as material quantity, and construction characteristics as the number of member connection. Numerical applications are studied to verify the effectiveness of the proposed design process to generate a new shape and connectivity of the outrigger for both static and dynamic responses.
Key Words
    conceptual design information; topology optimization; shape; topology; structural layout; outrigger
(1) Dongkyu Lee, Jaehong Lee, Kihak Lee:
Department of Architectural Engineering, Sejong University, Seoul, 143-747, Korea;
(2) Soomi Shin:
Research Institute of Industrial Technology, Pusan National University, Busan, 609-735, Korea.

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