Pavements and Slabs on Grade with Structurally Active Reinforcement


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Title: Pavements and Slabs on Grade with Structurally Active Reinforcement

Author(s): Anders Losberg

Publication: Journal Proceedings

Volume: 75

Issue: 12

Appears on pages(s): 647-657

Keywords: concrete pavements;concrete slabs;joints (junctions);loads (forces);reinforced concrete;reinforcing steels; shrinkage;slab-on-ground construction;structural analysis;structural design;subrades;tensile stress;thermal properties;yield line theory.

Date: 12/1/1978

From a structural designer's point of view it is illogical to make a pavement design as a plain or very slightly reinforced concrete slab, relying upon the flexural strength of concrete, which otherwise in all normal concrete structures is completely disregarded. A more natural way is to use the principals of reinforced concrete and use a concrete slab design with a two-way reinforcement near the bottom, where bending action from concentrated loadings, such as wheels, gives excessive tensile stresses. In this case it is possible to use the yield line theory for design alculations of the slab. This pape gives, based on these principals, the theorectials analyses for the various load cases, and summerizes the results in simple design diagrams. A review of tests carried out shows the reliablity of these results. Also the influence of temperature and shrinkage effects are treated and simple formulas are given for he joint design. Finally, a design example shows the method of calculation and the use of the diagrams.