Failure modes, reinforced concrete

Reinforced concrete is a complex material to model due to the brittle nature of concrete and non-homogenous properties. Although sophisticated methods are available to model crack propagation and other responses, simplified methods are normally used in blast design of facilities. These methods are based on a flexural response and rely on elimination of brittle modes of failure. To achieve a ductile response for concrete, proper proportioning and detailing of the reinforcing is necessary. 

Debonding of the EBFR in conjunction with the internal steel reinforcement in an elastic or yielding state is the most common failure mode. Further failure modes of the members that can be observed are concrete... 

There are three potential flexural failure modes for FRP-reinforced concrete sections (ISIS-Canada 2003) ... 

High titanium blast furnace slag reinforced concrete beam under the load, only small crack appeared before the reinforced yielded, and it mainly concentrated in the cross area. When the reinforced yielded, the crack s width significantly increased. Continue to increase load, the width of the cracks beyond the limit. The artifacts were completely destroyed finally. The failure mode of LI shown in Figure 3. 

Fig. 10.8. Located AE sources in reinforced concrete beams of (a) bending-mode failure and (b) shear-mode failure.

Concerning the reinforced concrete, two t) es of failure modes are known. One is referred to as bending-mode failure. In the beginning of loading, tensile cracks are nucleated at the bottom of the moment span (a portion between loading points in the case of two-point loading) due to bending... 

Fig. 10.10. AE activities and failure modes in reinforced concrete beams.

Garden, H. N. and Hollaway, L. C. (1998), An experimental study of the failure modes of reinforced concrete beams strengthened with prestressed carbon fibre composite plates . Composites Part B Engineering, Vol. 29, Issued, pp. 411 24. 

In this entry, the in-plane behavior and in-plane failure modes of infilled frames are presented. Then, macro- and micromodels for infill walls are presented followed by the results of experimental investigations for the replacement of masonry infill walls with reinforced concrete infills, as an economically viable method for retrofitting existing structures. Finally, methods... 

Seismic Vulnerability Assessment Reinforced Concrete Structures, Fig. 4 Conventional criterion for the evaluation of ultimate drift capacity independently of the failure mode observed... 

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