Cangling tunnel

a more than 7 km long highway tunnel

has received a great attention on its fire safety

especially its ventilation and smoke exhaust in fires.According to the suggestions from many consultants

a mode of longitudinal ventilation and smoke exhaust with an independent exhaust channel was employed in the system design of ventilation and exhaust.In order to judge the safety of the top-clapboard of the exhaust channel in fires

the deformation and internal force of the top-clapboard in both cases of normal temperature and a fire were comparatively analyzed with the software ANSYS

the temperature boundary conditions being based on the Fire Dynamics Simulator（FDS） results

to study the failure regularity of the top-clapboard in fires.The study reveals the critical failure temperature and the longitudinal damage extent of the top-clapboard in fires.