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Ultra-high-performance concrete (UHPC) is known to exhibit superior performance compared to conventional concrete. The applications of UHPC within structural engineering have been largely focused on its behavior under conventional loads. While the behavior of UHPC structural members has been thoroughly investigated under conventional loads, a literature gap exists regarding its application as a protective system against windborne debris impact. It is important to note that windborne debris stands as a primary cause of damage to building envelopes during severe wind events like tornadoes and hurricanes. In this study, the performance of UHPC wall panels was investigated under direct impact loads due to the representative debris projectiles as prescribed by various building codes. Full-scale finite element (FE) models were developed within the framework of LS-Dyna. Further FE studies into the performance of various UHPC walls panels under windborne debris impact were conducted using rigorously calibrated FE models. In this study, four UHPC walls of thicknesses 76.2, 101.4, 152.6, and 203.2 mm were studied against the windborne debris impact of both lumber and pipe projects. To study the effect of impact velocities, several impact scenarios with velocities ranging from 10 to 70 m/s were developed. This holistic matrix of simulations helped characterize various response measures, such as the type and extent of damage, in the UHPC wall panels individually and in comparison, with their normal-strength concrete (NSC) counterparts. This comprehensive array of simulations assisted in characterizing various response metrics, including the nature and extent of damage in UHPC walls. Based on the outcome of the simulations, the thicknesses required for the UHPC and NSC wall panels to stop the missile from perforation were determined. Further, embodied carbon contributions of the UHPC and NSC walls that could stop the windborne debris missile were estimated. A comparison of embodied carbon contribution and potential amount of concrete saved from this study provided additional insights for analysis and design purposes.

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Optimal Use of UHPC in Wall Systems to Mitigate Windborne Debris Hazard

  • 会议论文

  • 出版模式：

    开放获取

  • 发表日期：

    2025年

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  • Abhijit Kulkarni,
  • Behrouz Shafei

摘要

Ultra-high-performance concrete (UHPC) is known to exhibit superior performance compared to conventional concrete. The applications of UHPC within structural engineering have been largely focused on its behavior under conventional loads. While the behavior of UHPC structural members has been thoroughly investigated under conventional loads, a literature gap exists regarding its application as a protective system against windborne debris impact. It is important to note that windborne debris stands as a primary cause of damage to building envelopes during severe wind events like tornadoes and hurricanes. In this study, the performance of UHPC wall panels was investigated under direct impact loads due to the representative debris projectiles as prescribed by various building codes. Full-scale finite element (FE) models were developed within the framework of LS-Dyna. Further FE studies into the performance of various UHPC walls panels under windborne debris impact were conducted using rigorously calibrated FE models. In this study, four UHPC walls of thicknesses 76.2, 101.4, 152.6, and 203.2 mm were studied against the windborne debris impact of both lumber and pipe projects. To study the effect of impact velocities, several impact scenarios with velocities ranging from 10 to 70 m/s were developed. This holistic matrix of simulations helped characterize various response measures, such as the type and extent of damage, in the UHPC wall panels individually and in comparison, with their normal-strength concrete (NSC) counterparts. This comprehensive array of simulations assisted in characterizing various response metrics, including the nature and extent of damage in UHPC walls. Based on the outcome of the simulations, the thicknesses required for the UHPC and NSC wall panels to stop the missile from perforation were determined. Further, embodied carbon contributions of the UHPC and NSC walls that could stop the windborne debris missile were estimated. A comparison of embodied carbon contribution and potential amount of concrete saved from this study provided additional insights for analysis and design purposes.