Design Method Study for Sealant Joint Width of Precast Concrete Facade Panels

Determining sealant joint width is the key issue during the design of precast concrete facade panels， which is related to seismic， wind-resistant， waterproof， airtight， and fireproof performance of building facade panels system， and a reasonable sealant joint width is very important for the in-plane adaptability of the panels to the story drift of main structures and the displacement ability of the sealant. Based on the displacement ability of the sealant， the nominal shear deformation rate was put forward in this paper， and then calibrated， which can be directly used to calculate sealant joint size. The calculation method of sealant joint width was given by considering the influence factors of thermal movement， seismic movement， wind load movement， construction tolerances and sealant movement capacity， and the movement check computation of sealant joint width was suggested for the story drift of the main structure during fortification earthquake and rare earthquake. Finally， through a specific project example， it analyzed the impact of the connection mode of precast concrete facade panels and the main structure on the width of the joints， and gave the value of the joint width for different facade panel heights and connection modes， which can provide a reference for similar projects.