Analysis on Fatigue Performance of Assembled Monolithic Hollow-ribbed Slabs(PDF)
《建筑科学与工程学报》[ISSN:1673-2049/CN:61-1442/TU]
- Issue:
- 2018年05期
- Page:
- 109-117
- Research Field:
- Publishing date:
Info
- Title:
- Analysis on Fatigue Performance of Assembled Monolithic Hollow-ribbed Slabs
- Author(s):
- PAN Yong-xiang; WU Fang-bo; JIANG Wen; LI Jun
- CCCC Tunnel Engineering Bureau South China Branch
- Keywords:
- assembled monolithic; hollow floor; fatigue performance; theoretical analysis
- PACS:
- -
- DOI:
- -
- Abstract:
- Based on the summarizing of existing structural slab fatigue test results, the theoretical research on normal section bending fatigue performance of traditional assembled monolithic hollow-ribbed slabs was carried out. The calculation and checking formulas for the bending fatigue strength of traditional assembled monolithic hollow-ribbed slabs were presented. The feasibility of the formulas was verified by the calculation of the fatigue stress amplitude, the measured values and the specification limits of the lower steel bars of the rib beam. The fatigue stiffness based on the inverse algorithm was calculated and compared with the test data, and the law of stiffness degradation after fatigue was analyzed. By analyzing the fatigue stress amplitude calculation of rebar in precast slab, improvement measures were proposed. Through the definition of fatigue damage based on stiffness degradation, a function form which conforms to the law of stiffness degradation was selected, and a formula could be used to calculate the degree of stiffness degradation of the plate. The calculation method of fatigue stiffness and the prediction method of the performance of fatigue based on the fatigue stiffness degradation were put forward. The results show that when the stiffness of the plate is reduced to 20% of the elastic stiffness after the fatigue of the plate, the fatigue life and the fatigue failure stage will be reached. When assembled monolithic hollow-ribbed slabs are used in structures under fatigue loading, the improvement measures can ensure the whole fatigue performances of structures. The study results provide a reliable basis for the application of the new floor in the construction of the multistory parking lot, industrial factory building and the composite bridge decks.
Last Update: 2018-09-03