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Structural Engineering and Mechanics Volume 69, Number 1, January10 2019 , pages 1-10 DOI: https://doi.org/10.12989/sem.2019.69.1.001 |
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Minimum thickness of flat plates considering construction load effect |
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Hyeon-Jong Hwang, Gao Ma and Chang-Soo Kim
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| Abstract | ||
| In the construction of flat plate slabs, which are widely used for tall buildings but have relatively low flexural stiffness, serviceability problems such as excessive deflections and cracks are of great concern. To prevent excessive deflections at service load levels, current design codes require the minimum slab thickness, but the requirement could be unconservative because it is independent on loading and elastic modulus of concrete, both of which have significant effects on slab deflections. In the present study, to investigate the effects of the construction load of shored slabs, reduced flexural stiffness and moment distribution of early-age slabs, and creep and shrinkage of concrete on immediate and time-dependent deflections, numerical analysis was performed using the previously developed numerical models. A parametric study was performed for various design and construction conditions of practical ranges, and a new minimum permissible thickness of flat plate slabs was proposed satisfying the serviceability requirement for deflection. The proposed minimum slab thickness was compared with current design code provisions and numerical analysis results, and it agreed well with the numerical analysis results. | ||
| Key Words | ||
| flat plate slab; construction load; immediate deflection; time-dependent deflection; minimum thickness | ||
| Address | ||
| Hyeon-Jong Hwang: 1) College of Civil Engineering and Hunan Provincial Key Lab on Damage Diagnosis for Engineering Structures, Hunan Univ., Yuelu Mountain, Changsha, Hunan 410082, P.R. China 2) Engineering Research Institute, Seoul National Univ., Seoul 151-744, Republic of Korea Gao Ma: College of Civil Engineering and Hunan Provincial Key Lab on Damage Diagnosis for Engineering Structures, Hunan Univ., Yuelu Mountain, Changsha, Hunan 410082, P.R. China Chang-Soo Kim: School of Architecture, Seoul National University of Science and Technology, 232 Gongreung-ro, Nowon-gu, Seoul 01811, Republic of Korea | ||