1 Ductile Fire-resistive Material for Enhanced Fire Safety Under Multi-hazards – A Feasibility Study Qian Zhang 1 , Victor C. Li 2 1 Department of Civil and Environmental Engineering, University of Michigan, 1328 G.G. Brown Building, 2350 Hayward St., Ann Arbor, MI, 48109; PH (734)763-1315; email: maplezq@umich.edu 2 Department of Civil and Environmental Engineering, University of Michigan, 2326 G.G. Brown Building, 2350 Hayward St., Ann Arbor, MI, 48109; PH (734) 764-3688; email: vcli@umich.edu ABSTRACT Multi-hazards, such as earthquake and/or impact followed by fire, represent a major challenge on fire protection of steel structures. Spray-applied fire-resistive material (SFRM) is one of the most widely used passive fire protection material in North America. However, SFRM is inherently brittle and tends to dislodge or delaminate under extreme loading conditions (earthquakes or impacts) and even under normal service conditions such as wind induced building movement. Such loss of fire protection material puts the steel structure in great danger under fire loading. As an alternative to conventional brittle cementitious material, engineered cementitious composites (ECC) is a family of high performance fiber reinforced cementitious composites. ECC typically exhibits strain hardening behavior with very high tensile ductility (3-5%) under static and high rate loading. In this paper, a new type of fire-resistive material that combines the desirable thermal insulation property of SFRM and the enhanced ductility of ECC is proposed as an alternative material to current SFRM. Two preliminary mixture designs are presented. The thermal conductivity of the new fire-resistive ECC are measured in accordance with ASTM E2584 and are shown to be similar or lower than a conventional SFRM within the same density range. The proposed material achieves tensile strength up to 3 MPa and tensile strain capacity as high as 2.9%, significantly higher than those of conventional SFRM. Fire-resistive ECC with enhanced mechanical performance is expected to improve the overall fire safety of steel structure under multi-hazards. INTRODUCTION Behaviors and design of seismic resistance, impact resistance and fire resistance of structures have received wide attentions. However, most structures are not designed for more severe multi hazard scenarios, such as earthquakes or impacts followed by fires. These scenarios are not rare in reality, and represent a major challenge for civil engineers. One of the challenges is associated with the poor performance of cementitious spray-applied fire-resistive materials (SFRM) for steel structures under such conditions. 1148 Structures Congress 2014 © ASCE 2014 Structures Congress 2014 Downloaded from ascelibrary.org by University of Michigan on 04/28/14. Copyright ASCE. For personal use only; all rights reserved.