Abstract
An improved shear strength equation is proposed that considers transverse reinforcement spacing and support conditions for concrete wide beams. Eighteen specimens were fabricated to examine the influence of transverse reinforcement spacing, the number of transverse shear reinforcement, and support width on shear capacity. From the test results, a shear strength equation is proposed and used to evaluate the shear strength of 23 specimens from previous studies and 18 from this study. For the 41 specimens, the proposed shear strength equation results had a mean of 1.16 and a standard deviation of 0.16. It showed that the proposed shear strength equation can predict shear strength reasonably well for concrete wide beams.
Highlights
Concrete wide beams are used in commercial facilities, parking lots, and warehouses mainly to reduce story height
The error observed from proposed equation was 12.2%. These results indicate that by using this study’s proposed shear strength equation, shear strength can be more effectively estimated since it considers significant variables affecting a concrete wide beam
The shear capacity decreased as the transverse reinforcement spacing increased
Summary
Concrete wide beams are used in commercial facilities, parking lots, and warehouses mainly to reduce story height. The stirrup legs are normally placed around the outermost longitudinal reinforcement for shear reinforcement. A lack of shear reinforcement across the web of the beam can lead to a concentration of diagonal compressive stresses. For beams with greater width than the support, they can cause different cracking patterns due to the stress concentration in the beams. Leonhardt and Walther [1] suggested that transverse reinforcement spacing should be limited to 200 mm to 400 mm depending on the shear stress. Hsiumg and Frantz [2] and Anderson and Ramirez [3]
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