International Journal of Advanced Innovative Technology in Engineering (IJAITE)

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Seismic Behaviour of Multistory Building with And Without Soft Story Effect Using Masonary Strut in ETABS Software

Minal U. Pawar, Prof. M. R. Nikhar, Prof. M. M. Lohe

Abstract :

Many low-rise and medium-rise framed buildings have been constructed in the recent past, without proper attention paid in their design for wind or earthquake loads. This serious shortcoming in structural design and detailing has been exposed by failure that has occurred in the recent earthquakes in various parts of the country. Nowadays reinforced cement concrete frames are most common in building construction practices around the globe. The vertical gaps in reinforced cement concrete frames that are created by column & beam are generally filed by brick masonry. If these gaps are not filled by brick masonry, then the structure is known as a bare frame structure. Due to gaps, the bare frame has a very low resistance to lateral forces, which fail structure. Openings are provided in structure for doors, windows, etc. In this work, to provide stiffness to the structure, we provide an infill wall strut of 230 mm thick brick masonry & effective depth under compression calculated by equivalent diagonal strut method. Infill wall act as compression strut between column & beam & forces is transferred from one node to another. Such as a building in which the upper story has a brick-infill wall panel and an open ground story is called a stilt building and an open story is called a stilt floor or soft story. A soft story is also known as the weak story it is the story in which that has less substantial resistance than the above story or below. The G+6 storied residential building with different models is considered. In each case, we provide a bare frame and infill wall at different positions with different types of struts & then studied the behavior of the structure under seismic forces. Based on that, parametric studies on story displacement, story drift, time period shear force, and moments have been carried out using equivalent static analysis & response spectrum analysis to investigate the influence of this parameter on the behavior of buildings with soft story

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