Residual Bearing Capacity of Hollow Sandwich Square Steel Tube Recycled Concrete Column After Fire(PDF)
《建筑科学与工程学报》[ISSN:1673-2049/CN:61-1442/TU]
- Issue:
- 2019年01期
- Page:
- 76-84
- Research Field:
- Publishing date:
Info
- Title:
- Residual Bearing Capacity of Hollow Sandwich Square Steel Tube Recycled Concrete Column After Fire
- Author(s):
- ZHANG Yu-zhuo; LU Xue-tao; LI Xiao-ting
- Computing Research Center of BIM, Shenyang Jianzhu University
- Keywords:
- square steel tube recycled concrete column; hollow sandwich; fire; residual bearing capacity
- PACS:
- -
- DOI:
- -
- Abstract:
- In order to study the residual mechanical properties of hollow sandwich square steel tube recycled concrete column after fire, the finite element model of hollow sandwich square steel tube recycled concrete column under ISO 834 standard fire action was established by using finite element analysis software ABAQUS. The variation of temperature field and stress field of cross section was analyzed after verification of relevant experiments. On the basis, the effects of concrete strength, steel strength, calculated length, fire time, hollow ratio, concrete substitution ratio and eccentricity on the residual mechanical properties of components after fire were analyzed. A simplified formula for calculating the residual bearing capacity of hollow sandwich square steel tube recycled concrete column after fire was given quantitatively based on a large number of calculation results. The results show that residual bearing capacity of components increases with the increase of steel strength and concrete strength after fire. The residual bearing capacity of components decreases with the increase of calculating length and fire time. When the fire time exceeds 60 min, the residual bearing capacity of components decreases sharply after fire. The hollow ratio and concrete substitution ratio have little influence on the residual bearing capacity of components after fire. The residual bearing capacity of components after fire decreases with the increase of hollow ratio, and increases first and then decreases with the increase of concrete substitution ratio. The residual bearing capacity of components decreases with the increase of eccentricity after fire. The calculation accuracy of the proposed formula is good, which can provide reference for fire resistance design of hollow sandwich square steel tube recycled concrete columns.
Last Update: 2019-01-23