Bracing Cross Section Effect to Dissipation Energy by Numerical Analysis

Zola, Prima and Rahmat, Rahmat and Rifwan, Fitra (2017) Bracing Cross Section Effect to Dissipation Energy by Numerical Analysis. In: 4th International Conference on Technical and Vocation Education and Training (TVET): Technical and Vocational Education and Training for Sustainable Societies, 9-11 November 2017, Padang.

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Abstract

Indonesia is located in the earthquake-prone area. In the planning of earthquake-resisted structures, ductility, stiffness, and amount of structural dissipation energy are very important factors. Experts in the field of structural engineering try to find a structural system that can minimize structural damage due to earthquake loads. The structure system must be able to dissipate the energy due to earthquake load. Earthquake resistant buildings made of steel can have advantages in terms of strength, weight, and ductility compared to reinforced concrete buildings when properly planned. Known earthquake-resistant structures include two types of portal systems: a moment of resisting frame (MRF)and portals with stiffening elements or Braced Frame (BF). The portal system with the stiffening element or the Braced Frame (BF) is divided into two subsystems: Concentrically Braced Frame (CBF) and eccentrically bracedFrame(EBF) Among the three earthquake-resistant structural buildings on top, the structure of Concentrically Braced Frame (CBF) type X.has a higher rigidity. Because the diagonal shape will mechanically have a more rigid nature of the quadrilateral. The absorption of the energy of a concentric mined steel frame earthquake is done through melting and post bending of the stiffening element. This paper presents numeric study output on ductility, stiffness, and dissipation energy on Concentrically Braced Frames type X as consequence of different structural bracing cross-sectional installation position. The numeric study output by using MSC/Nastran software with conducted five modeling of single-story Concentrically Braced Frames type X (CBF-X) which measures 4m x 6m with the different installation position of the cross-section of bracing and gusset plate. Based on the results of numerical analysis of cyclic and push -over analysis, we get the load curve (P) vs displacement () which explains the energy dissipation behavior of the five structures and analyzing the behavior of the five structures studied in this numerical study due to the monotonic and cyclic loading so as to obtain a clear picture of the structure of CBF- X is best used. The different bracing cross-sectional installation position affects ductility, stiffness, and amount of dissipation energy on Concentrically Braced Frames type-X. It is closely related to a difference of the first yielding location occurring on structures. The bracing capability to perceive a large inelastic deformation is affected by bracing stability on buckling without the loss of strength and stiffness. Total gusset plates used in Concentrically Braced Frames type-X affects ductility and stiffness values. This numeric study output shows that CBF-X structure is the best for use as earthquakeresisted structures with the position of web bracing cross-sectional stay in one field with web column and beam position and make use a gusset plate where structural first yielding occurred in 2t area at a gusset plate.

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