A program of 36 bent cap sections of 36-in. Depth was tested in an investigation primarily directed toward the bond and shear strengths which should be used in design. Intermediate, a 432, and a 431 grade steels were used. Even though the final failures were often classified as bond or shear, only 8 percent of the specimens failed at less than calculated fy steel stress. The average fs developed was between 1. 15fy and 1. 20fy. In shear it was found that an ultimate v much higher than allowed by current specifications was feasible for loads placed between 0.5d and 1.2d from the support. Vertical stirrups added no perceptible strength, but horizontal web steel was effective. In bond it was found that the nominal bond stress in the length between load and support was not important, but that an end anchorage distance beyond the load was essential. With an end anchorage of 15 in. For no. 11 bars or 12. In. For no. 8 bars, there seemed to be no problem in developing a 75-ksi steel. The width of web cracks was only slightly less than that of flexural cracks on the tension face and suggested the desirability of using horizontal stirrups in these cantilever ends.
The cantilevered bent caps of four reinforced concrete bridges were tested to determine the effects of deterioration on these bent caps. Two of the be...
At congested highway interchanges, the Texas Department of Transportation (TxDOT) uses narrow concrete piers andshallow depth steel cap girders. Resea...
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