STABILITY ANALYSIS OF STEEL FRAME STRUCTURES: P-DELTA ANALYSIS (original) (raw)

Abstract

The high rise buildings require high frame structure stability for safety and design purposes. This research focused on P-delta analysis to be compared with linear static analysis. In this study, a 18 storey steel frame structure with 68.9 m has been selected to be idealized as multi storey steel building model. The model is analyzed by using STAAD.Pro 2007 structural analysis software with the consideration of P-delta effect. At the same time the influence of different bracing patterns has been investigated. For this reason five types of bracing systems including X, V, Single Diagonal, Double X, K bracing with unbraced model of same configuration are modeled and analyzed. The framed structure is analyzed for Wind load as per IS 875 (part 3)-1987. After analysis, the comparative study is presented with respective to Maximum storey displacement and Axial Force. The present work showed that the 'X'bracing in continuous bracing pattern is proved to be more effective with respect to both Static and P-delta analysis.

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What impact does the X type bracing system have on lateral displacements?add

The study concludes that X type bracing significantly reduces lateral displacements compared to alternative bracing systems, enhancing stability in tall buildings.

How does P-Delta analysis contribute to stability assessments in tall structures?add

P-Delta analysis is crucial as it evaluates the influence of lateral loads on tall structures, especially under wind pressures.

What role do bracing systems play in enhancing the structural performance of buildings?add

Bracing systems improve lateral stiffness and reduce flexural and shear demands, addressing stability challenges in multi-storey constructions.

When were the guidelines for seismic performance of buildings established in this context?add

The seismic performance guidelines were based on Indian standards IS 1893: 2002, specifically for seismic zone 4.

What limitations does the study mention regarding soil-structure interaction in its models?add

The models assumed firm bottom fixity and neglected soil-structure interaction, which may affect the accuracy of stability assessments.

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References (5)

  1. structure", Part 2, Imposed loads. BIS, ManakBhawan, New Delhi, India.
  2. BIS Code, IS 875 (Part 3)-1987, "Code of Practice for design loads (other than earthquake) for building and structure", Part 3, Wind Loads, BIS, ManakBhawan, New Delhi, India.
  3. IS 802 (Part 1/Sec 1):1995 and IS 802 (Part 1/Sec):1992, "Use of Structural Steel in Overhead Transmission Line Tower -code of Practice.
  4. "Design of Steel Structures" by Prof. S.R. Satish Kumar and Prof. A.R. Santha Kumar. BIOGRAPHIE
  5. Mallikarjuna B N, M.tech in Structural Engineering AIT Chickmaglur, Contact No-9844040692.