International Research Journal of Engineering and Technology (IRJET)
e-ISSN: 2395-0056
Volume: 10 Issue: 06 | Jun 2023
p-ISSN: 2395-0072
www.irjet.net
Analysis And Design of High Rise Buildings With Vertical Irregularities Located at Seismic Zone-III. Sahil M Kathiriya1, Mili Sankhla2 1 Student Structure Engineering Department, L.J.I.E.T. Ahmadabad, Gujarat, India 2 Professor Civil Engineering Department, L.J.I.E.T. Ahmadabad, Gujarat, India
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Abstract - The primary subjects of this study are the
necessarily at the same rate). In terms of their dynamic properties, these structures' height-wise stiffness and mass fluctuations differ from those of a "typical" building. The stepped building shape has not received much attention from the design codes. This could be as a result of the literature's dearth of published studies on stepped structures.
analysis and design of high rise buildings with vertical irregularities. India is a developing country at the moment with a sizable population, and as a result of this large population, there is a lack of available land there. Due to a paucity of land, India has little opportunity to stretch a construction out horizontally. That structure began to spread vertically throughout India. Make the shape of the structure asymmetrical for aesthetic purposes. Consequently, it is crucial to evaluate and create irregular structures. For this purpose, this study analyses and designs an irregular structure. and the goal of this effort is to enhance the understanding and design of vertically uneven structures.
Seismic disturbances can cause damage to existing structures. The design of structures for seismic susceptibility is of paramount importance since it causes economic loss. Building seismic performance is substantially different from wind loading patterns that cause elastic deformations in structures. It is believed that perfect uniformity in building is an ideal that seldom comes true. They really combine the two, though. Plan and elevation irregularities are two separate opinions, according to important national and international rules. A paradigm shift has already occurred in the comparison of irregular and regular structures. Plan irregularity indicates that this sort of asymmetric behaviour is caused by a non-uniform mass, stiffness, and strength distribution over the structure, leading to significant floor rotations and displacements, as shown by previous earthquakes. Numerous improvements have been considered in recent decades.
Key Words: Irregular Structure, Storey Shear, Storey Shear Force, Storey Displacement, Storey Drift
1.INTRODUCTION Damage from earthquake ground motion frequently starts where there are structural vulnerabilities in the lateral load resisting frames in multi-storeyed framed constructions. Occasionally, differences in mass, stiffness, or strength between neighbouring floors may contribute to these issues. The frame geometry across the height frequently undergoes rapid alterations in conjunction with these storey shifts. Several structures have collapsed as a result of such vertical discontinuities during previous earthquakes. When a building's lateral dimension is decreased along its height, a common sort of vertical discontinuity is generated. In this instance, the "stepped" building type is significant. Due to its attractive and useful design, this specific building type is being employed more and more often in the construction of contemporary multi-story buildings. For instance, in an urban area with closely spaced tall buildings, a tiered design like this one gives the lowest levels ample sunlight and ventilation. Furthermore, this style of building design ensures adherence to "floor area ratio"-related building byelaw restrictions (common in India). New Delhi(fig.1), located in metropolitan India, is a well-known example of a stepped building. Stepped structures exhibit abrupt, staggered reductions in floor area along the building's height, as well as equivalent reductions in mass, strength, and stiffness (albeit not
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Fig-1: A typical stepped building located in New Delhi, India.[1]
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