ENGINEERING SOLUTION FOR THE UNIFORM STRENGTH OF PARTIALLY CRACKED CONCRETE (05-1988)
Elin Alstrup Jensen, Lawrence Technological University
Will Hansen, University of Michigan
Rune Brincker, Aalborg University, Denmark

Significant computational resources are required when predicting the remaining strength from numerical fracture analysis of a jointed plain concrete pavement (JPCP) containing a partial depth crack. It is, therefore, advantageous when the failure strength can be adequately predicted using an engineering solution. Current engineering or closed-form solutions are based on the elastic effective crack approach with the fracture parameters toughness and critical crack tip opening of concrete. The solutions do not directly consider the effect of the distance to the boundary conditions restrained slab length and the cracking process due to stress softening across the crack. This paper proposes an engineering solution methodology that includes these latter variables, and the application of the solution is demonstrated on a slab containing a partial depth midslab crack and subjected to in-plane tension. The solution captures the effects of material fracture properties and structural size in terms of crack length and distance from boundary to the crack. The model assumes a bi-linear stress-crack width relationship for the fracture process zone. The concrete characteristic length, based on the fracture energy represented by the first part of the stress-crack width relationship, controls the failure load of a partially cracked concrete slab. A unique master curve between slab strength and crack depth is developed based on results from the numerical analysis. The master curve is verified with results from laboratory testing of large-scale slabs subjected to in-plane tension. The solution methodology can readily be extended to other loading cases.