. Canadian engineer. i, a very common value in rectangular beamdesign. To use the chart, enter at the left with a givenvalue of d, the depth of the beam ; follow across hori-zontally to the line of the adopted stirrup area; then fromthis point move up to the fiber stress assigned to thestirrup ; and finally passing to the right from this lastpoint, the value of the moment increment for either ver-tical or inclined rods may be read. Let us consider the portion of the beam shown in , loaded in such a manner as to produce the momentcurve 0.\. It is desired to reinforce the portion shownwith
. Canadian engineer. i, a very common value in rectangular beamdesign. To use the chart, enter at the left with a givenvalue of d, the depth of the beam ; follow across hori-zontally to the line of the adopted stirrup area; then fromthis point move up to the fiber stress assigned to thestirrup ; and finally passing to the right from this lastpoint, the value of the moment increment for either ver-tical or inclined rods may be read. Let us consider the portion of the beam shown in , loaded in such a manner as to produce the momentcurve 0.\. It is desired to reinforce the portion shownwith vertical stirrups, keeping in mind the principles just /?rea of 3tirrup, OJ 02 a3 04. Fig. 2. laid down. A certain stirrup has been adopted which forthis particular beam gives the value of M\ from eq. (6)equal to the vertical distance shown in Fig. 3a. The firstincrement intercepts the portion Om of the curve: thesecond, mn, and so on. Let one of these intercepts, asMn, be projected onto the beam, thereby defining an ) on the diagram of the beam. From the precedingdiscussion this area is the portion of the beam in whichthe adopted stirrup will exactly carry the shear. Thelength 5 of the portion is seen to vary as the shear variesalong the beam. Since the stirrup is required to carry theshear for this portion of the beam it will be placed throughthe centre of the portion. Likewise, each other portion ofthe beam defined by the projection of the intercept of Miwill have a stirrup placed at its centre. To eliminate tjie feature of dividing each portion ofthe beam, the following method is suggested: Lay off, asthe first value, % M\ (Fig. 3b). Let all other values
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