- Issue:
- 2019年04期

- Page:
- 31-39

- Research Field:

- Publishing date:

- Title:
- Force Mechanism and Influencing Factors of Precast Monolithic Structures to Resist Progressive Collapse

- Author(s):
- HUANG Yuan
^{1}; 2; CHEN Gui-rong^{1}; 2; HU Xiao-fang^{1}; 2 - (1. Hunan Provincial Key Laboratory on Damage Diagnosis for Engineering Structures, Hunan University, Changsha 410082, Hunan, China; 2. College of Civil Engineering, Hunan University, Changsha 410082, Hunan, China)

- Keywords:
- precast monolithic structure; progressive collapse; arch compression mechanism; catenary mechanism; influencing factor

- PACS:
- TU375

- DOI:
- -

- Abstract:
- In order to study the force mechanism of arch compression and catenary stages, the monolithic precast concrete frame(PCF)models were established by SAP2000 and verified by experimental data. On the basis, the analysis models were established, and the A2 model was selected to analyze the mechanism of the two stages in detail. Then, the bearing capacities of two stages were compared with the classical plastic hinge theory, and the capacity increase coefficients of arch compression mechanism and catenary mechanism were defined as
*η*and*ξ*respectively. The effects of parameters, such as span-to-height ratio, number of storey and reinforcement ratio and on the collapse resistance of the structure were studied. The results show that when the bottom reinforcement ratio increases from 0.44% to 0.88%, the maximum bearing capacities of arch compression mechanism*F*_{u.a}and catenary mechanism*F*_{u.c}increase by 37% and 88.7% respectively, and the value of*η*decreases from 1.25 to 1.22, and the value of*η*increases from 1.06 to 1.45. When the top reinforcement ratio increases from 0.66% to 1.03%,*F*_{u.a}increases by 25%,*η*decreases from 1.25 to 1.20, while*F*_{u.c}changes slightly, and*ξ*decreases from 1.57 to 1.16. When the span-height ratio increases from 8 to 15(changing the span),*F*_{u.a}and*F*_{u.c}decrease by 67% and 59% respectively,*η*decreases from 1.33 to 1.18, and*ξ*increases from 1.44 to 1.59. When the span-to-height ratio increases from 8 to 15(changing the height of beam),*F*_{u.a}and*F*_{u.c}decrease by 87.7% and 59.9% respectively,*η*decreases from 1.35 to 1.08, and*ξ*increases from 1.44 to 3.85. When the number of stories increases,*η*decreases, but*ξ*increases. The stiffness of lateral restraint has a great influence on the catenary effect. When the column's relative flexural stiffness is large or the number of spans with lateral restraint is large, the effect of catenary is more significant.

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- Memo:
- -

Last Update: 2019-07-26