International Research Journal of Engineering and Technology (IRJET)
e-ISSN: 2395-0056
Volume: 11 Issue: 01 | Jan 2024
p-ISSN: 2395-0072
www.irjet.net
Seismic Analysis of Braced Frame with Different Base Condition Shivashankar Vadekar1, 2B. P. Annapurna 1Research Scholar, Department of Civil Engineering, UVCE, Bangalore University, Bangalore, Karnataka, India. 2Professor, Department of Civil Engineering, UVCE, Bangalore University, Bangalore, Karnataka India.
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Abstract: The use of base isolators helps the structure to mitigate the lateral forces like wind and seismic etc. by expanding the
vibration period of the structure. The lateral forces are also resisted by the use of special measure known as steel bracing. Steel bracing decrease the horizontal deformation by increasing the vertical stiffness and stability. In the current study, analysis of RC frames with different base conditions (Fixed, HDRB and LRB) along with different types of bracing (X type, Forward diagonal type and backward diagonal type) is carried out using response spectrum method. For this study, G+10 multi-storey building is assumed and is situated at seismic zone V. modelling and analysis of the building frame are carried out in Etabs software (2015 version). From the present study, it is observed that Lead Rubber Bearing Base isolators with completely X bracing (E type) is most suitable.
Key words:- HDRB, LRB, Forward diagonal type , Backward diagonal type and X type, base drift, storey shear, stiffness. 1. INTRODUCTION As India is developing country, the infrastructure of the country is modernizing rapidly and also increase in population of the country leads to growth to the population density. To meet the desire of the people of land for construction (housing, commercial building and other buildings) is fulfiled only with the vertical development i.e. multistory buildings. Along with the vertical development, it is responsibility of every engineer to mitigate the forces like seismic and wind etc. which are unfavorable for structure safety. As the height of the building increases, the deformation of the building also increases. So it is necessary to recommend special measures to reduce these kind of deformation and the base isolation technique is one of the special measures to take a run at mitigation of deformation of the building. Another measure to oppose lateral force is steel bracing, it resist horizontal forces by increasing its vertical stiffness. There are various types of bracing systems like Forward diagonal type, backward diagonal type, X type, V type, inverted V type, K type, diagonal type and so on. In the present study, the effect of base isolators i.e. HIGH DAMPING RUBBER BEARING and LEAD RUBBER BEARING along with different types of bracing i.e. Forward diagonal type, backward diagonal type and X type are located in different position of the frame member are studied. The behavior of building is studied under the following results i.e. storey drift, base shear, storey displacement and Fundamental time period of building and compared with building with fixed base without any bracing.
2. OBJECTIVE a) b) c) d) e)
Ten story building is analyzed in Etabs software without bracings and with different bracing systems. Compare the reaction of different braced and unbraced frame subjected to horizontal loads. Identify the effective base condition and bracing system to resist the lateral loads effectively. To identify the effective type of bracing. Types of bracing: Forward diagonal, backward diagonal and X types bracing systems are used.
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