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<p>The catastrophic soft-story collapse of a 33-story reinforced concrete (RC) structure in Bangkok on March 28, 2025, following the Myanmar earthquake, exemplifies the critical vulnerability of conventional building systems to seismic events. This study investigates Galvanized Steel Welded Wire Mesh (GW Mesh) confinement as a mitigation strategy through experimental testing and numerical modeling. Results demonstrated that GW Mesh-confined specimens achieved a 14.29% increase in strain capacity and 9.5% enhancement in post-yield strength, with moment-curvature analysis revealing 6.52% improvement in yielding curvature and 10.23% increase in ultimate curvature. Pushover analysis showed GW Mesh-confined RC frames withstanding 23.5% higher base shear capacity (3206 kips versus 2451 kips) with failure occurring at the 13th push step compared to the 9th step in unconfined models. Hysteresis behavior confirmed enhanced energy dissipation and reduced stiffness degradation, while backbone curves demonstrated a 1.2-inch increase in displacement capacity. This research provides viable solutions for retrofitting soft-story buildings in seismically active regions, addressing the specific failure mechanisms observed in the Bangkok collapse through enhanced ductility and progressive collapse resistance.</p>

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Experimental and Numerical Investigation on Galvanized Steel Welded Wire Mesh Confinement for Seismic Resilience and Prevention of Soft-Storey Failures

  • 期刊论文

  • 发表日期：

    2025年7月31日

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  • Atif Mehmood Khan,
  • Hilal Khan,
  • Arslan Mushtaq,
  • Zamil Bin Zahid,
  • Muhammad Farhan Saleem

摘要

The catastrophic soft-story collapse of a 33-story reinforced concrete (RC) structure in Bangkok on March 28, 2025, following the Myanmar earthquake, exemplifies the critical vulnerability of conventional building systems to seismic events. This study investigates Galvanized Steel Welded Wire Mesh (GW Mesh) confinement as a mitigation strategy through experimental testing and numerical modeling. Results demonstrated that GW Mesh-confined specimens achieved a 14.29% increase in strain capacity and 9.5% enhancement in post-yield strength, with moment-curvature analysis revealing 6.52% improvement in yielding curvature and 10.23% increase in ultimate curvature. Pushover analysis showed GW Mesh-confined RC frames withstanding 23.5% higher base shear capacity (3206 kips versus 2451 kips) with failure occurring at the 13th push step compared to the 9th step in unconfined models. Hysteresis behavior confirmed enhanced energy dissipation and reduced stiffness degradation, while backbone curves demonstrated a 1.2-inch increase in displacement capacity. This research provides viable solutions for retrofitting soft-story buildings in seismically active regions, addressing the specific failure mechanisms observed in the Bangkok collapse through enhanced ductility and progressive collapse resistance.