RESEARCH ON DAMAGE CHARACTERISTICS OF CIRCULAR COMPREHENSIVE PIPE GALLERY STRUCTURE UNDER FIRE
Fires caused by cables and gas in urban comprehensive pipe galleries not only cause significant econom-ic losses, but also damage the structure of the pipe gallery, affecting its service status and service life. To investigate the influence of fire on the structure of a comprehensive pipe gallery, this paper established a three-dimensional fi-nite element model of temperature stress coupling for a circular comprehensive pipe gallery by ABAQUS. The defor-mation law and structural damage of the comprehensive pipe gallery under fire accident are analyzed. The results show that the deformation of the inner wall rapidly increases within 7.5 minutes of combustion, and subsequently, it slows down and tends to stabilize, in which the structural deformation is symmetrically distributed on both sides. The inner side of the circular pipe gallery structure is under compression state and the outer side is under tension state, in which the stress is evenly distributed along the circumference. The tensile stress of the rectangular pipe gallery is concentrated at the armpit corner, and the outer stress is relatively small, while the circular pipe gallery still has a large tensile stress on the outer side. It is recommended to add corresponding fire resistance measures on the outer side of the circular pipe gallery. The damage area of the circular pipe gallery structure is about 13 m on both sides of the fire source, laying the foundation for the fire resistance design of the comprehensive pipe gallery.
circular comprehensive pipe gallerystructural damage under firetemperature stress coupling
万方数据
维普
