PROGRESSIVE COLLAPSE RESISTANCE OF FLAT SLAB BUILDING



PROGRESSIVE COLLAPSE RESISTANCE OF FLAT SLAB BUILDING

Kavya.G.R1 , Shivaraju.G.D2, Dr. T V Mallesh3, S R Ramesh4
1 M.Tech student, Department of Civil Engineering, SSIT, Tumkur-Karnataka, India
2Assistant Professor, Department of Civil Engineering, SSIT, Tumkur-Karnataka, India
3Professor and head, Department of Civil Engineering, SSIT, Tumkur-Karnataka, India
4 Professor, Department of Civil Engineering, SSIT, Tumkur-Karnataka, India

Abstract— When an initial local failure causes the loss of gravity load capacity of building structures, it may lead to the eventual collapse of the entire building or a large part of it. This type of collapse is defined as progressive collapse or disproportionate collapse. Previous researches on progressive collapse of building structures mainly focuses on concrete and steel frame structures. But, here investigation carried out on Flat slab RC Structure to study the effect of column elimination in different storeys of building on progressive collapse and also influence of column eliminated at corner position, exterior middle position and interior middle position of the building is quantified. For this investigation; 5 storey building is modelled and linear static analyses are carried out and conclusions are drawn. The collapse ratio of the building increases because as observed the percentage of axial force increases as there is elimination of column in the interior middle position. As observed elimination of column in the interior middle there is large increase in axial force and moments.

Key Words: progressive collapse, RC slab, punching-shear, flat slab, ETABS software, demand capacity ratio. etc

Introduction : When an initial local failure causes the loss of gravity load capacity of building structures, it may lead to the eventual collapse of the entire building, or a large part of it. This type of collapse is defined as progressive collapse or disproportionate collapse. There is significant interest in developing methods to avoid such instances. Extensive research has examined the behaviour of structures following the loss of column. It is a dynamic process, usually accompanied by large deformations, in which the collapsing system continually seeks alternative load paths in order to survive. One of the important characteristics of progressive collapse is that the final damage is not proportional to the initial damage. RC slabs with long spans extended over several bays and only supported by columns, without beams known as flat slab. Flat-slab structures are much more vulnerable to disproportionate collapse than moment-frame structures as there are no beams to redistribute the loads initially resisted by the lost column. Moreover, the propagation of punching-shear failure at slab–column connections due to load redistribution may result in the collapse of the entire slab. Thus, increased attentions should be paid toward assessing the disproportionate collapse performance of flat-slab structures. Flat slabs analysis and design of flat slabs are still the active areas of research and there is still no general agreement on the best design procedure.

PROGRESSIVE COLLAPSE RESISTANCE OF FLAT SLAB BUILDING
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