Evaluation of Shear Lag Index in High-Rise RC Buildings Having Exo-skeleton Structural System
- PDF / 7,818,850 Bytes
- 24 Pages / 595.276 x 790.866 pts Page_size
- 27 Downloads / 181 Views
RESEARCH PAPER
Evaluation of Shear Lag Index in High‑Rise RC Buildings Having Exo‑skeleton Structural System Sima Aramesh1 · Ali Kheyroddin2 Received: 27 February 2020 / Accepted: 19 September 2020 © Shiraz University 2020
Abstract Although framed tube system has been found to be the most efficient system for high-rise buildings, they could experience the shear lag effects which will result in nonlinear distribution of axial stress along the flange and the web of the cross-section of the tall building plan. Exoskeleton structure is generally found to be a self-supporting structural system set outside and suitably connected to a primary inner structure, the latter being enhanced or protected. In this article, by studying three types of concrete structures having 20, 30, and 40 stories with elevations of 80, 120, and 160 m, respectively, the effects of change in the location of openings on Exo-Skeleton structures on the shear lag phenomenon are investigated. The shear lag of the compression wing of the structural models, which are perpendicular to the lateral force application, was studied. Among the index related to the shear lag, two indexes of the shear lag index including the axial stress ratio of each element in the axis to the axial stress of the middle element and the axial stress ratio of the corner element to the tensile stress of the middle element derived from the structural analysis under load side effects were studied. It could be concluded that the most effective opening configuration with the greatest reduction in shear lag is proposed for structures with different aspect ratios. Keywords Tall building · Shear lag · Exo-skeleton · Structural system · Stress distribution
1 Introduction In Exo-skeleton structural system, an external skeleton is utilized for providing the building with a load-resisting structure. The term exoskeleton is taken from biology, where some creatures have an external skeleton that protects the animals body as against humans having internal skeletons. Generally, exoskeleton structure is used to indicate a selfsupporting structural system set outside and suitably connected to a primary inner structure, the latter being enhanced or protected, in a general sense, by virtue of this connection. Attention has been recently drawn to the potential asset of exoskeleton structures for an integrated retrofitting approach of existing buildings, in which structural safety as well as energy efficiency, environmental sustainability, and * Sima Aramesh [email protected] 1
Department of Civil Engineering, Faculty of Semnan, Semnan Branch, Technical and Vocational University (TVU), Semnan, Iran
Faculty of Civil Engineering, Semnan University, Semnan, Iran
2
architectural quality are improved in a combined and coordinated way (Marini et al. 2014; Belleri and Marini 2016; Caverzan et al. 2016; Zheng et al. 2019a, 2019b). Interaction of flexure and compression in steel beamcolumns with fixed-roller boundary conditions was studied by Foraboschi (2019). His works indicated that the eff
Data Loading...
