STUDY OF STRUCTURAL IRREGULARITES IN HIGH RISE BUILDINGS WITH P? EFFECT

V.Guruprasad, Arunkumar.B.N

Abstract: In this thesis a detailed study on the behavior of structural irregularities in high rise building with and without the influence of P? effect has been carried out using E-TABS 2015 software package. in order to study the behavior of both plan irregularity (i.e. C, L, H, T shapes plans), vertical irregularity ( i.e. stiffness, geometric and mass irregularity) and also conventional rectangular shape, models with 5different storey heights (i.e. G+9, G+14, G19, G 24, and G+29) are modeled in E-TABS satisfying the irregularity criteria as per codes. And was analyzed by static method (Cp-coefficient method) for a basic wind speed of 50m/s, on the other side dynamic wind analysis by Gust factor method was done by calculating Gust values for each model and K2 coefficient for each floor heights to study the effect of Fz i.e. along wind load and cross wind forces on the structural irregularity models, and also in order to observe with and without effects of P? on high rise building, P? analysis was done for both static and dynamic analysis. As a result based on the storey displacement, moments and storey drift it was observed that the structures with irregularity configurations are 40% more prone to destabilizing stresses i.e. 1.4 times more when compared to conventional rectangular non-irregularity structure and also was observed that dynamic stresses is 1.7 times more than the linear static method of wind analysis

Keywords: P-?, Structure Irregularity, E-TABS, Cp-Coefficient Method, Gust Factor

DOI: https://doi.org/10.15623/ijret.2016.0509038