Mechanical Performance Test and Deflection Calculation Analysis of Shale Ceramsite Lightweight Concrete Two-way Composite Floor Slab(PDF)
《建筑科学与工程学报》[ISSN:1673-2049/CN:61-1442/TU]
- Issue:
- 2018年06期
- Page:
- 102-110
- Research Field:
- Publishing date:
Info
- Title:
- Mechanical Performance Test and Deflection Calculation Analysis of Shale Ceramsite Lightweight Concrete Two-way Composite Floor Slab
- Author(s):
- GU Qian; LEI Xiao-tian; HUANG Chao; ZHAO Duan-feng
- School of Civil Engineering and Architecture, Wuhan University of Technology
- Keywords:
- shale ceramsite concrete; composite slab; two-way slab; thin plate theory; deflection; mechanical performance
- PACS:
- -
- DOI:
- -
- Abstract:
- According to the static-load test of three full-scale shale ceramsite concrete two-way composite floor slabs and one full-scale cast-in-place concrete two-way floor slab, the deflection and deformation characteristics of the normal concrete of the two-way composite prefabricated bottom slab and the shale ceramsite lightweight concrete of the post-cast laminated layer with similar strength grade were analyzed. Based on the experimental results and the theory of elastic mechanics of thin plates, the formulas for calculating deflection of shale ceramsite concrete two-way composite floor slabs were deduced. The expressions of neutral axis height, bending stiffness and deflection of four boundary-fixed shale ceramsite concrete and ordinary concrete composite slabs under the vertical distributed load were deduced, then the calculating formulas of deflection and initial stiffness were modified. The calculation formulas of deflection for shale ceramsite lightweight concrete two-way composite floor slabs considering the rotation of four sides supports were proposed. The results show that the mid-span displacement of shale ceramsite lightweight concrete two-way composite floor slab exhibits liner elastic variation characteristic. The elastic modulus of shale ceramsite lightweight concrete, the steel truss in the composite slab and the restraint conditions at the end of the two-way composite slab are the main factors affecting the rigidity and midspan deflection of composite slab. The deflection values of the shale ceramsite concrete composite floor slab calculated by the proposed formula are in good agreement with the experimental values.
Last Update: 2018-11-22