Experimental Study and Theoretical Analysis of Clt Two-Way Slabs Under Parameter Fire

To investigate the fire resistance of Cross-Laminated Timber (CLT) two-way slabs, this study conducted experimental research on the fire resistance of CLT two-way slabs under parametric fire conditions. Key parameters such as temperature distribution, charring depth, charring rate, mid-span vertical displacement, and fire resistance were measured. The results showed that when the delamination occurred, the charring rate of the CLT two-way slabs could reach up to 1.13mm/min, which is significantly higher than the standard specified rate of 0.65 mm/min. When the vertical displacement at the mid span of the CLT two-way slab reaches the maximum displacement limit in the fire resistance judgment criteria, the component fails. On this basis, a calculation formula for the vertical deflection of equivalent isotropic slabs was established using the difference method. The accuracy of the theoretical calculation formula was verified by comparing it with test results. Subsequently, a calculation method for the fire resistance of CLT two-way slabs was proposed, providing a theoretical basis for the fire resistance design of CLT two-way slabs.