“Effect of Vertical Geometric Irregularity on Flat slab system with Response spectrum Analysis”

Abstract

Steel structures today are edging towards the end of their design life. The increase of the urban population desires to construct big prestigious buildings for residence and business cause. The development of multi-storey building and big span structures is becoming a vital a part of our living style. Seismic evaluation is a subset of structural evaluation and is the calculation of the reaction of a structure to earthquakes. The prevailing goal of this work is to examine the numerous parameters like base shear, story displacement and story drift & stresses performing on flat slab system. Analysis of the large systems built the usage of flat slab in rectangular shape layout will be carried out with the help of Staad pro 2007 software via using is 456-2000Code. The main objective of the analysis is to study the behaviour of flat slab system in geometric vertical irregular multi-storied steel building against different forces acting on it during earthquake. The analysis is carried out using STAAD Pro2007 software. Steel structure frame with R.C.C flat slab without drop, steel column with I section & steel cantilever Beam with T section for vertical irregularity are modeled and analyzed for the dynamic loading. The analysis is made between Steel frame flat slab structure of G+10 story 150 %, 200%, 300% & 600% vertical irregular building with center, right & left edge positions. Response spectrum analysis results provide a more realistic behaviour of structure response and hence it can be seen that the displacement values in X directions are least in model with vertical irregularity in center when compared to all other models. Analysis of 150% 200%, 300% & 600% irregular building from center, left edge & right edge position with flat slab system in steel frame and results are carried out. It’s concluded that the flat slab vertical geometric irregular Structure at the center position with mass irregularity 200% is more sustainable for the effect of dynamic load on the performance of building as compare to other cases of irregularity in present study. Comparison in made between principal stresses, von mis stresses, tresca stresses & shear stresses in flat slab system, bending moment, node displacement, peak storey shear, Story drift & the result are brought out.