International Research Journal of Engineering and Technology (IRJET)
e-ISSN: 2395-0056
Volume: 09 Issue: 05 | May 2022
p-ISSN: 2395-0072
www.irjet.net
Performance Based Approach for Seismic Design of Tall Building Diaphragms Shubham Dattatraya Khamkar1, Dr. Atul Bhimrao Pujari2 1PG
Student, Department of Civil Engineering, K J College of Engineering and Management Research, Pune, Maharashtra, India 2Associate Professor, Department of Civil Engineering, K J College of Engineering and Management Research, Pune, Maharashtra, India ---------------------------------------------------------------------***--------------------------------------------------------------------requirements in different parts of the building in the case of Abstract - The construction industry is always trying to inelastic behavior during significant seismic occurrences.
find out innovative and better technology in the field design sector. The performance-based design technique for seismic design has the ability to signify higher levels of performance for a structure at various intensities of a seismic event.
An approach known as performance-based seismic design uses certain ground motion and reliability parameters to create a structural system that is not damaged beyond a predetermined point during an earthquake. Under the particular ground motion, a performance level depicts a damage situation that is regarded as suitable for a certain structure. It has led to a new perception of the tall building’s seismic design, founding a smart take off in analysis & evaluation techniques from the prescriptive force-based design methods on the basis of linear elastic analysis under the action of decreased seismic loads and the principles of capacity design, to the non-prescriptive displacement-based design approaches on the basis of nonlinear analysis and performance assessments w.r.t. the demand parameters which are expected. Buildings may be constructed not just to protect people but also to allow for ongoing occupancy and operation after an earthquake. This method permits a building operator/owner of the building to choose an acceptable degree of building damage for certain earthquake ground shaking intensity which may then be used as a target or goal for the seismic design effort.
In the present work, the performance of the tall building has been checked against the Service Level Earthquake (SLE) and the Maximum Considered Earthquake (MCE) Level by performing the linear and nonlinear procedures with and without the assignment of Rigid and Semi-Rigid Diaphragms by using ETABS software. The performance of the tall building has been checked against the common P-delta effect using a formula-based excel sheet. Due to the incorporation of the shear wall into the tall building, the value of Base Shear was found to be increased by 2.5 % with the help of Nonlinear THA (Time History Analysis) compared to Linear RSA (Response Spectrum Analysis). There was an increase in time by 4 % with the help of Nonlinear THA compared to Linear RSA. The Story Drift has been increased by 75 % with the help of Nonlinear THA contrasted to the Linear RSA. There is a rise in Shear Force by 23 % using the Nonlinear THA compared to the Linear RSA. The Bending Moment was found to be increased by 25 % using the Nonlinear THA compared to the Linear RSA.
Seismic Performance Objectives: Table 1 shows the precise performance criteria for the design of buildings at two stages of seismic risks.
Key Words: Performance based approach, Seismic design, Diaphragms, SLE Level, MCE Level.
Table 1 Objectives for Seismic Performance
1. INTRODUCTION Performance-based design is an advanced technique for seismic-resistant structures that was widely employed in the assessment of existing buildings and the seismic design of several new tall buildings. The structural over-strength factor is increased by seismic forces to predict the greatest forces in elastic parts, such as diaphragms, in the design. The purpose of these elements is to make simple the process of structural design with the help of using elastic analysis methodologies. These approaches do not take into account structural performance at the ground motion characteristics, component level, and the seismic redistribution
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Impact Factor value: 7.529
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Earthquake Level
Objectives Performance
Frequent/Service: 50% likelihood of exceeding in 30years (43year return time), 2.5percent structural damping.
Serviceability: The structure's ability to endure future disasters must not be impacted by minor structural damage. Earthquake shaking is deemed to be the highest, even if it is not rectified.
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Seismic
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