Numerical analysis of fire exposed ultra-high performance concrete (UHPC) columns

摘要

Due to higher aesthetical requirements for the load bearing structure, an increasing amount of slender components is used. The ongoing research and development in concrete technology yields to the possibility to process this slender components out of ultra-high performance concrete (UHPC). Compared to normal strength concrete, the high packing density and the addition of steel fibres leads to a high compressive strength and ductile behavior. In case of fire protection, these material properties and slender dimensions are disadvantageous, because the high packing density leads to high pore pressure and concrete spalling when the remaining water content is evaporating. The higher surface to volume ratio of slender components additionally leads to higher temperatures and reduced load bearing capacity in case of fire.