International Research Journal of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 11 Issue: 07 | July 2024
www.irjet.net
p-ISSN: 2395-0072
ALTERATION IN IRREGULAR STRUCTURAL BEHAVIOR DUE TO PARAMETRIC VARIATIONS UNDER PUSHOVER ANALYSIS Rahul Prajapati1, Mili Sankhla2, Aakash suthar3 1M.Tech Student, L.J. University, Ahmedabad
2Kishan Jayswal, Assistance Professor, Civil Engineering Department, L.J. University, Ahmedabad, India.
---------------------------------------------------------------------***--------------------------------------------------------------------1. Plan irregularities Abstract – Earthquake is the one of the most dangerous natural hazards to damage structure in the world. Now a day construction space is very less, So tall structures are more introduce on field. Irregular structure cannot analysis by seismic method (linear static method) for this analysis we use nonlinear static method. For the analysis E-tabs software is Using for Pushover analysis we can understand that at which joint beam or column is first damage when earthquake occur. Pushover analysis method we cannot design structure but ductile detailing make structure safer. This study help to improve structure performance in earthquake. Key Words: Irregular Structure, pushover analysis, Etabs.
1.INTRODUCTION
FIGURE 1- Plan irregularities
In the event of an earthquake, structure damage typically begins at the weakest point within a building. A structure is classified as regular when its design displays nearly symmetrical configuration around the axis, while irregularity emerges from the absence of symmetry and disruption in geometry, mass distribution or load bearing components. In urban setting with limited construction space, irregularities manifest more frequently, necessitating structural engineers to possess comprehensive knowledge of irregular structure response to seismic activity.
2.
Vertical irregularities
Irregularities within building structure often stem from uneven mass, strength, and stiffness distribution along their height. Constructing such building in high seismic zones complicates analysis and design. Two primary irregularity type are recognized.
FIGURE 2- Plan irregularities Plan or vertical irregularities render structures susceptible to seismic forces. Torsional irregularity and sudden increases in overturning moment are consequences of structural irregularities. Therefore, addressing irregularity becomes a critical aspect in the design phase, especially when considering stiffness irregularity resulting from abrupt stiffness changes between adjacent floors, like setback in a building’s elevation.
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