Which effect limits the flexural capacity of a reinforced concrete beam with insufficient stirrups under load?

💡 Explanation

When a R/C beam lacks adequate stirrups, diagonal tension cracks propagate due to insufficient shear reinforcement, causing a link in the path for the formation of diagonal compression struts, leading to premature shear failure near the supports. So premature shear failure results, rather than spalling, buckling, or deflection which involve different reinforcement ratios.

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