Load-Carrying Capacities of Fully Clamped RC Slab Accompanying Compressive-Tensile Membrane Actions: A Theoretical Approach

Author:

Chen Wanxiang123,Luo Lisheng2,Guo Zhikun2,Wang Yingjie2

Affiliation:

1. School of Civil Engineering, Sun Yat-Sen University, Zhuhai 519082, P. R. China

2. State Key Laboratory of Disaster Prevention & Mitigation of Explosion & Impact, Army Engineering University of PLA, Nanjing 210007, P. R. China

3. Southern Marine Science and Engineering, Guangdong Laboratory, Zhuhai 519082, P. R. China

Abstract

Fully clamped reinforced concrete (RC) slab is a common structural component possessing better load-carrying capacity over simply supported slab. Currently, typical yield line theory is a popular approach to estimate the bearing capacity of fully clamped RC slab, although it would greatly underestimate the actual ultimate resistance. This paper is devoted to enriching the knowledge of membrane action and its contribution to the load-carrying capacity of the clamped slab. The resistance trajectory of fully clamped RC slab from loading to failure undergoes three phases: the ascending branch raised by outward movement prevention, the descending branch due to crushed concrete and the re-ascending branch caused by reinforcement strain. Applied load–deflection curves of RC slab accompanying compressive-membrane actions are achieved according to the bending theory of normal cross-section. The reserve capacities accompanying tensile-membrane actions in the condition of large deformations are further derived. The whole load–deflection curves that considered compressive-tensile membrane effects are finally presented, where the mid-span displacements are revised by the deflection equations and the softening coefficient of flexural rigidity. It is indicated that the load–deflection relationships of fully clamped RC slabs can be reasonably depicted by taking compressive-tensile membrane effects into account, which are fairly different from yield line approaches. Comparative analysis shows that analytical results are in good agreement with experimental data reported by Park et al. and illustrates that the proposed model is capable of predicting the bearing capacity of fully clamped RC slab with very good accuracy.

Funder

National Natural Science Foundation of China

Natural Science Foundation of Jiangsu Province

Publisher

World Scientific Pub Co Pte Lt

Subject

Applied Mathematics,Mechanical Engineering,Ocean Engineering,Aerospace Engineering,Building and Construction,Civil and Structural Engineering

Reference30 articles.

1. R. Park and W. L. Gamble, Reinforced Concrete Slabs (John Wiley & Sons, New York, 1980), pp. 526–610.

2. Reinforced Concrete Structures

3. R. H. Wood and D. C. Drucker, Plastic and Elastic Design of Slabs and Plates (Thames and Hudson, 1961), pp. 225–261.

4. Ultimate Strength Study of Two-Way Concrete Slabs

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