Seismic Evaluation of Different Structural Systems in Stepped Building Frame
Yamuna S. R1, Aneena Babu2
1Yamuna S.R, Department of Civil Engineering, Mar Baselios College of Engineering & Technology, Trivandrum (Kerala), India.
2Aneena Babu, Department of Civil Engineering, Mar Baselios College of Engineering & Technology, Trivandrum (Kerala), India.
Manuscript received on 05 December 2018 | Revised Manuscript received on 19 December 2018 | Manuscript published on 30 December 2018 | PP: 53-58 | Volume-8 Issue-2C, December 2018 | Retrieval Number: 100.1/ijeat.ICID-2018_EE_121
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Abstract: High rise structures have fascinated mankind from the beginning of the civilization itself. In the last few decades the rate of growth in vertical structures has increased drastically. Seismic performance of a building is an important criteria to be considered in the design phase. Many building nowadays have irregular configuration both in plan and elevation. Usually, irregularities are unavoidable in the construction of buildings. This causes the structure to be more vulnerable to damages during earthquakes. Hence, it is necessary to assess the seismic performance of a structure in the design phase. In this work, a hybrid system which is a combination of conventional lateral load resisting system (bracings and shear wall) and a moment resisting frame is used, to improve the seismic performance of vertical irregular structures such as stepped building. Vertical discontinuity arises from reduction of the lateral dimension of the building along its height commonly known as stepped building. Different types of concentric bracing systems have been used. The regularity index provides a basis for assessing the degree of irregularities in a stepped building frame. Torsional effect of structures were also studied. The performance of the structure is assessed by means of modal analysis and nonlinear time history analysis in SAP 2000 (version 2014).Shear wall with concentric brace and shear wall with X brace turned out to be the best hybrid system in terms of seismic performance.
Keywords: Stepped Building Frame, Dual System, Hybrid System, Regularity Index.
Scope of the Article: Structural Engineering