Iris Publishers- Peer Review Journal of Civil Engineering

Iris Publishers- Peer Review Journal of Civil Engineering


Quantifying the Influence of the Horizontal Slab Systems on the Building Resisting Performance against Earthquake

Floor systems play an integral part with the vertical components in resisting the lateral as well as the gravity loading. The purpose from this study is to identify the effect of the horizontal slab systems on the building resisting performance against ground motion excitations. Floors act as horizontal diaphragm with very large stiffness in the horizontal direction, and as apart from their traditional function to resist vertical load and help to distribute lateral loads into vertical structure elements such as walls and columns. Reinforced concrete floor system is classified into two categories; (a) One-way slab when the slab is supported on two sides only, the load will be transferred to these sides, while (b) Two-way slab when the slab supported on all four sides, and the load transferred in two orthogonal directions [1] .By definition, the types of slabs are, flat plates are the slabs that do not have beams, drop panel, column head between columns, and directly supported to columns. However, flat slabs are the slabs that do not have beams but are supported on drop cap or column capitals, in contrast for the two-way slab and beam. Flat slab systems one of the unique reinforced concrete structural systems forms that have poor structural efficiency, and insufficient lateral resistance performance under earthquake loading [2]. This becomes necessary to investigate and evaluate the vulnerability of this special slab system. The flat slab can easily construct, but unfortunately, it is poor resistance under earthquake experience which causes a vulnerable and failure [3]. Erberik & Elnashai [4] monitored the performance limit state for moment resisting frame system and flat-slab system using fragility curves. The developed fragility curves provide that the structural losses in the flat slab are in the same range with the moment resisting frame. Apostolska et al. [5] noted that the flat slab structural system under lateral load is flexible and more vulnerable against seismic loading. In order to improve its seismic behavior, certain modifications are needed to achieve in constructing the flat slab system. Hueste and Bai evaluated the structural response of RC-flat slab office building located in the U.S using nonlinear static analysis and nonlinear dynamic analysis, which do not meet the basic safety criteria of FEMA 356 [6,7]. Gowda & Tata [8] prepared two models to analyze the seismic behavior of the building using Response Spectrum method. In the first model is a commercial building consist of the flat slab with drop panel that generates the better seismic performance rather than the second model without drop panel.

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