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<p>The dire consequences of progressive collapse in terms of both the economy and lives have led to increased interest in the robust design of buildings. These buildings are resilient and retain their structural integrity by preventing the spread of a local failure into a complete collapse. To achieve this, innovative structural mechanisms are being developed to strengthen local resistance and create alternate load paths. Simultaneously, advanced finite element tools and techniques are emerging to aid the design process, offering a cost-effective alternative to extensive experimental programs. This research has developed and elaborated a computationally efficient simplified finite element approach to study two specially designed robust moment-resisting frames, including the bond-slip behavior. These frames, i.e., intermediate moment frame and special moment frame, have been designed by NIST as external frames of a 10-story building and consist of two beams supported on three columns. The column loss scenario of the central column has been considered in the simplified finite element approach, simulating the experimental tests by NIST. The simplified modeling technique involves the use of limited beam elements for both the beams and columns, as well as zero-length beam elements and rigid links incorporating non-linear behavior for connections. Special attention has been paid towards the rebar and concrete bond-slip behavior near the beam supports. The results indicated that the elaborated simplified finite element approach can efficiently and accurately predict the progressive collapse behavior of the RC frame structure. Also, comparing results with previous experimental and finite element results indicated that including bond-slip behavior is critical to obtain accurate results, especially during the post-elastic phase when the arching action develops into catenary action under large displacements induced by column loss. The presented simplified finite element technique can be satisfactorily applied for the accurate and computationally inexpensive modeling and analysis of RC frame buildings under column-loss scenarios.</p>

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Numerical investigations on RC beam-column structures under collapse phenomenon—a simplified finite element approach

  • 期刊论文

  • 发表日期：

    2025年5月15日

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  • Aleem Ullah,
  • Abdul Qadir Bhatti,
  • Attiq Ur Rahman Dogar,
  • Girum Urgessa,
  • Muhammad Usman

摘要

The dire consequences of progressive collapse in terms of both the economy and lives have led to increased interest in the robust design of buildings. These buildings are resilient and retain their structural integrity by preventing the spread of a local failure into a complete collapse. To achieve this, innovative structural mechanisms are being developed to strengthen local resistance and create alternate load paths. Simultaneously, advanced finite element tools and techniques are emerging to aid the design process, offering a cost-effective alternative to extensive experimental programs. This research has developed and elaborated a computationally efficient simplified finite element approach to study two specially designed robust moment-resisting frames, including the bond-slip behavior. These frames, i.e., intermediate moment frame and special moment frame, have been designed by NIST as external frames of a 10-story building and consist of two beams supported on three columns. The column loss scenario of the central column has been considered in the simplified finite element approach, simulating the experimental tests by NIST. The simplified modeling technique involves the use of limited beam elements for both the beams and columns, as well as zero-length beam elements and rigid links incorporating non-linear behavior for connections. Special attention has been paid towards the rebar and concrete bond-slip behavior near the beam supports. The results indicated that the elaborated simplified finite element approach can efficiently and accurately predict the progressive collapse behavior of the RC frame structure. Also, comparing results with previous experimental and finite element results indicated that including bond-slip behavior is critical to obtain accurate results, especially during the post-elastic phase when the arching action develops into catenary action under large displacements induced by column loss. The presented simplified finite element technique can be satisfactorily applied for the accurate and computationally inexpensive modeling and analysis of RC frame buildings under column-loss scenarios.