International Research Journal of Engineering and Technology (IRJET) Volume: 09 Issue: 06 | Jun 2022
www.irjet.net
e-ISSN: 2395-0056 p-ISSN: 2395-0072
COMPARATIVE STUDY OF SEISMIC ANALYSIS OF REGULAR AND IRREGULAR STRUCTURE WITH AND WITHOUT POST-TENSIONED SLAB Rohan Kumar Choudhary, Nishigandha A. Khot Nishigandha A. Khot is currently pursuing master’s degree program in Structural Engineering in School of Civil Engineering, Sandip University, Nashik, Maharashtra, India 2Rohankumar Choudhary, Assistant Professor, Department of Structural Engineering, Sandip University, Nashik, Maharashtra, India ---------------------------------------------------------------------***--------------------------------------------------------------------1
Abstract - In this paper, seismic analysis is carried out on
2. To perform response spectra analysis and get the responses of story drift in each direction.
regular and irregular structures with and without posttensioned slabs. Post-tensioned slab has been increased due to its ease, economy and it has more advantages over conventional type. Its is a challenging task for any structural engineer when an irregular structure or building to be designed with post tensioned slab are in a seismic zone. This thesis is to compare the seismic performance of such structure. Modelling of G+10 story building using ETABS and performing response spectrum analysis using said software. It has been observed that the displacement is higher in regular structure in comparison to the same structure with the use of PT slab. It also shows how irregular structures are affected by torsion.
3. To analyze the torsional irregularity. 4. To differentiate the results under the same seismic parameters in irregular structures with and without posttensioned slabs.
2. LITERATURE REVIEW A state-of-the-art literature review is carried out as part of the present study. This chapter presents a brief summary of the literature review and all the studies about different types of structures and the parameters that will be used.
Key Words: Seismic, ETABS, Response spectrum analysis, and Torsion
2.1 Types of Structures:
1. INTRODUCTION
a) Regular structures: Regular structures are the ones that are in vertical configurations and have no significant discontinuities in the plan.
A sudden violent shaking of the ground, destroying the earth’s crust is known as an earthquake. Structure collapse, tsunamis, fires, rock falls, landslides, and other secondary hazards can all result in fatalities during earthquakes. Structures kind, quality, and vibration are the key determinants of structural collapse intensity. The amount of fatalities is influenced by structural reaction, structure type, time (and season) of the earthquake, as well as rescue and relief. Construction typologies can often be categorized into three major categories: (a) earthquake loads, (b) gravity loads, and (c) (c) non-engineering. A high percentage of developing nations, including India, fall under these groups (b) and (c). Such architectural typologies result in significant human casualties during violent shaking.[1]
b) Irregular Structures: Irregular structures are the ones that have certain physical discontinuities either in the plan or in elevation or both which affect the performance of the structure subjected to lateral load. c) The irregularity in building structures could be attributable to irregular mass, strength, and stiffness distributions along the building's height. The irregularity can be caused when a building is L shaped or T shaped, or when we have parking floors whose floor height is different from the others, or when we have amenities such as swimmimg pool on the middle floor or so as shown is fig 1. The study and design of such structures become more challenging when they are built in high seismic zones.
1.1 Aim and Objective The aim of design is the achievement of an acceptable probability that structures being designed will perform satisfactorily in the software mentioned with the following objectives:
Different types of irregularity in building are:[2]
1. To perform response spectra analysis and get the responses of displacement.
3] Geometric irregularity
© 2022, IRJET
|
Impact Factor value: 7.529
1] Mass irregularity irregularity 2] Stiffness irregularity 4] In-plane irregularity
|
ISO 9001:2008 Certified Journal
|
Page 3045