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STUDY OF EFFECT OF SSI ON SEISMIC RESPONSE OF AN IRREGULAR RC STRUCTURE ON SLOPING GROUND AND ITS RESPONSE CONTROL BY USING BRACINGS

Omkar Avinash Ratnaparkhe, S.N. Deshmukh

Abstract


Structures located on sloping terrain surface are more susceptible to earthquake because of uneven plan and elevation irregularities. Lately, high-rise buildings have been design with various plan and elevation irregularities to elevate their visual aesthetics. In the most of cases, the structural analysis under an earthquake load has been done without considering the effect of soil-structure interaction (SSI), thereby it may not reflect the actual seismic response of the structures. In the present study an attempt is made to examine the effects of flexible base i.e. considering SSI and fixed base i.e. without SSI on the seismic response of an irregular structure on sloping ground and to regulate its seismic response by using bracings. A RC framed of G+14 structures on sloping ground by considering medium soil are considered for the study having regular rectangular shape and other having irregular T-shape in plan. Response spectrum analysis (RSA) including SSI has been carried out in ETABS software to obtain the response of building. It is observed that inclusion of SSI into the analysis shows the effect on response of structures and its effect on parameters like modal mass participation, storey displacement, max storey drift, torsional displacement, modal time periods and base shear. It is also seen that by placing the bracing at suitable location in a rectangular as well as t- shape building with inclusion of SSI, the seismic response of structure is reduces effectively.


Keywords


Soil structure interaction, Sloping ground, Bracings, Response Spectrum analysis, Response of irregular RCC buildings, ETABS

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References


Rahul Ghosh and Rama Debbarma. Effect of slope angle variation on the structures resting on hilly region considering soil–structure interaction. Int J of Adv Struct Eng. 2019; 67-77p.

Rayudu Jarapala and Kishore Chandra Biswal. Dynamic behavior of vertically irregular Sloping ground buildings. Asian J of Civil Eng. Springer 2020.

M. Elmeliegy and Youssef F. Rashed. Efficient Preconditioned Soil–Foundation–Structure Interaction Approach to Compute Tall-Building Time Periods. American Society of Civil Engineers 2019; 24(3): 1-13p.

Navid Yeganeh, Jafar Bazaz and Ali Akhtarpour. Seismic analysis of the soil–structure interaction for a high rise building adjacent to deep excavation. Soil Dynamics and Earthquake Eng. 2015; 149–170p.

S.Tabatabaiefar, Behzad Fatahi and Bijan Samali. Seismic Behavior of Building Frames Considering Dynamic Soil-Structure Interaction. Int j geomech. ASCE 2013; 409-420p.

Pranab Das, Sekhar Dutta and Tushar Datta. Seismic Behavior of Plan and Vertically Irregular Structures: State of Art and Future Challenges. Nat hazards rev. ASCE 2020; 22(2): 1-17p.

Mitesh Surana, Yogendra Singh and Dominik H. Lang. Seismic Characterization and Vulnerability of Building Stock in Hilly Regions. Nat hazards rev. ASCE 2018; 19(1): 1-16p.

Zaid Mohammad, Abdul Baqi and Mohammed Arif. Seismic Response of RC Framed Buildings Resting on Hill Slopes. 11th Int Symposium on Plasticity and Impact Mech. Science Direct 2016; 1792 – 1799p.

Behzad Fatahi, Bohan Huang, Sergei Terzaghi, et al. Three-Dimensional Simulation of Seismic Slope–Foundation–Structure Interaction for Buildings Near Shallow Slopes. Int j geomech. ASCE 2020; 20(1): 1-20p.

Fariborz Alahi and Mohsen Vatandoost. Single diagonal precast prestressed concrete bracing for strengthening existing concrete frames. Int J of Adv Struct Eng. Springer 2018; 1-9p.

American Society of Civil Engineers, PRESTANDARD AND COMMENTARY FOR THE SEISMIC REHABILITATION OF BUILDINGS (2000) FEDERAL EMERGENCY MANAGEMENT AGENCY Washington, D.C, P: 4-19 – 4-20.

IS: 1893-2016 part-1. Indian standard criteria for Earthquake Resistant design of structures. Bureau of Indian Standards, New Delhi, India.

IS: 456-2000. Code of Practice for Plain and Reinforced Concrete. Bureau of Indian Standards, New Delhi, India, 2000.

IS875 (Part-1):1987 Code of Practice for design of loads of building & structures Part-I. Dead loads. Bureau of Indian Standards, New Delhi.

IS875 (Part-II):1987 Code of Practice for design of loads of building & structures Part-II. Live loads. Bureau of Indian Standards, New Delhi.


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