A treatise on concrete, plain and reinforced : materials, construction, and design of concrete and reinforced concrete; 2nd ed. . l diagonal 1700 + 1600tension = X 6 X 12 = 118 800 pounds. One-third of the shear, or 39 600 pounds, is assumed to be taken by the concrete, hence the tension to be taken by the shear reinforcements is 79 200 pounds. Since six |-inch round rods are to be bent, their area is . , , , . ., , , . AsX 16 000square inches and their tensile value from page 449 is — 82 000 pounds. Now comparing the above values it is seen that 474 A TREATISE ON CONCRETE tensile value o
A treatise on concrete, plain and reinforced : materials, construction, and design of concrete and reinforced concrete; 2nd ed. . l diagonal 1700 + 1600tension = X 6 X 12 = 118 800 pounds. One-third of the shear, or 39 600 pounds, is assumed to be taken by the concrete, hence the tension to be taken by the shear reinforcements is 79 200 pounds. Since six |-inch round rods are to be bent, their area is . , , , . ., , , . AsX 16 000square inches and their tensile value from page 449 is — 82 000 pounds. Now comparing the above values it is seen that 474 A TREATISE ON CONCRETE tensile value of bars is in excess of stress to be provided for. It is alsonecessary that the bent bars be properly distributed and since shearis nearly uniform between the supports and the intersection of thebeam, the inclined bars should be spaced at points a, b, points were found by dividing the distance on the center line A Binto equal parts. They should be laid off on the neutral axis, butsince the neutral axis changes for the positive and negative moment,the center line, as lying between the two neutral axes, was PLAN OF BARS WHICH ARE NOT B£; Fig. 149.—Reinforcement for Girder {See p. 474) A study must be made to see whether the tensile stresses m the bottomof the beam will permit this. In this case the girder is loaded by con-centrated loads and the moment at the point where the beam mter-sects the girder is nearly the maximum. Approximate hguring oftensile stresses shows that the first two bars may be bent about 15inches from the center of the intersection of the beam, while to resistdiagonal tension the bar to intersect the center line at a should be bentat e as shown by the dotted line. To provide for the diagonal tension,between point a and the beam stirrups will be introduced. Using^-inch rods for stirrups, the tensile value of which is 2 X .196 X 16 000 6270 o • l, = 6 270 pounds, it is necessary to space them ^^^_ = inches apart, as shown in Fig.
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Keywords: ., bookcentury1900, bookdecade1910, bookpublishernewyo, bookyear1912
