Investigation on Fire Resistance Performance of Joints in Insulated Precast Concrete Sandwich Wall Panels

The application of insulated precast concrete sandwich walls in external envelope systems has characteristics such as outstanding thermal insulation， high durability， and rapid installation. However， the flammability and thermal conductivity of insulation layers exacerbate risks of structural damage and fire spread under the influence of high-temperature smoke during fires. Therefore， it is necessary to research the fire resistance performance of seaming joints between panels and window opening joints. Firstly， this paper investigated the structural design requirements of the seaming joints between panels and window opening joints in the current specifications. Based on the characteristics of ultra-low energy buildings， applicable fire-resistant joint design methods were proposed. Experimental studies on the fire resistance performance of seaming joints between panels and window opening joints were conducted. The fire behavior of the specimens， temperature variation， and fire-affected area were investigated as the key indicators. Based on the test result， optimized joint design methods considering fire resistance performance were proposed to prevent fire spread and protect building structures.