Cracking Behavior in Precast Deck Slab Concrete Structure under Cyclic Loading

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Author(s) Nawir Rasidi | Agoes Soehardjono MD | Achfas Zacoeb
Pages 781-786
Volume 3
Issue 8
Date August, 2013
Keywords crack width, repeated load, precast deck slab, tri-linear model

Abstract

This research presents a prediction method of crack width in composite precast deck slab concrete structure under cyclic or repeated loading. The test result of crack width prediction procedures proposed by various researchers indicates that each formula contains a different set of variables. A literature review also suggests that there is no general agreement among various researchers on the relative significance of different variables affecting the crack width. An analytical method is developed to determine the concrete stress distribution near flexural cracks in reinforced concrete one-way slabs and used to investigate the effects of various variables on the spacing and width of cracks. The formula is developed using a large number of tri-linear model values calculated from the concrete and steel strains at various sections between adjacent cracks for a number of composite precast deck slabs. The present method of incorporating the tension stiffening effect is verified by comparing calculated fracture mechanic and those measured by other researchers. The tri-linear model values at sections between adjacent cracks are calculated using an empirical formula. Development of this formula is based on the tri-linear model values calculated using the concrete and steel strains at various sections between successive cracks, for a number of composite precast deck slabs. Using the tri-linear model values evaluated by the proposed formula, short-term deflections were determined for a large number of flexural members and the results were compared with those measured by other researchers. This comparison indicated that the present method of incorporating the tension stiffening effect in fracture mechanic calculations is acceptable.

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