Significance Of Stress Intensity Factor On Failure Behaviour Of Reinforced Concrete Beam (A case study of: Mode I Fracture)
Journal Title: International Journal of Engineering and Science Invention - Year 2018, Vol 7, Issue 5
Abstract
The term Stress Intensity Factor β SIF, is one of the fracture parameters which describes stress intensity around crack tip, represented by variable K. Depends on its critical value Kc , structural failure capacity might be analyzed based on the view of point of fracture mechanics. This study focuses on how reinforcement influences the rate of crack propagation. Wedge forces developed by cohesiveness between re-bar and concrete is the main concern in transforming brittle failure to plastic failure by means reducing the value of K. Specimen with three point mode I fracture reinforced high strength concrete beam was used in analytical processing. It is a mode I fracture beam of (150x300) mm with 100 mm initial crack. This specimen is reinforced by 4#12mm steel bar. Under wedge forces due to a center bending load, led a value of K equal to 482.70 πππβ1.5 for beam without reinforcement, whereas 441.613 πππβ1.5 for beam with reinforcement.Superposition of these both actions prevails the net of stress intensity factor πΎ = 41.087πππβ1.5 . By applying the term strain energy released rate G in conjunction with stress intensity factor K through the relationship πΎ = πΈπΊ, prevails, netto of G = 35 N/m , a value under which normal plain concrete would fail.
Authors and Affiliations
Agnes H Patty
Keywords
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