. Practical structural design; a text and reference work for engineers, architects, builders, draftsmen and technical schools;. ain bent strap of steel or wrought ironthe designer should require the manufacturers to furnish recordsof tests on the stirrups they propose to supply. To design a stirrup: First obtain the area required for bearing,then the thickness to prevent straightening at the edge of the sup- 94 PRACTICAL STRUCTURAL DESIGN port, then check to see that the area of the vertical legs is sufficientin tensile strength to carry the load. This last item is generallytaken care of when
. Practical structural design; a text and reference work for engineers, architects, builders, draftsmen and technical schools;. ain bent strap of steel or wrought ironthe designer should require the manufacturers to furnish recordsof tests on the stirrups they propose to supply. To design a stirrup: First obtain the area required for bearing,then the thickness to prevent straightening at the edge of the sup- 94 PRACTICAL STRUCTURAL DESIGN port, then check to see that the area of the vertical legs is sufficientin tensile strength to carry the load. This last item is generallytaken care of when the other conditions are satisfied. 5. Design a strap hanger, or stirrup^ for the 8-in. x 14-in. beamin the last example. Answer. — The total load = 10,700 lbs. which gives a reaction= 5350 lbs. The allowable compression across the grain = 250 lbs. per square inch, so the bearing area in the stirrup = 5350250 = sq. ins. The width of the beam is 8 ins., therefore the width of the under the end of the beam = —^ = ins. Make the strap o ins. wide, a stock width. Allowing a value of 10,000 lbs. per. Fig. 62 — Various Styles of Stirrups square inch tension for wrought iron the required area of the two 5350legs = TTrTjTjTj = sq. ins. or sq. ins. for each leg. The 0 2675thickness of metal required = _ = in. (practically No. z. / o 10 gauge). Allowing a fiber stress of 14,000 lbs. per square inch 5350for steel, the required area in the two legs = ttt^h^ = sq. ^ ^ 14,000 in., or sq. in. for each leg. The thickness of metal required 0 191= - = in. (practically No. 13 gauge). Each leg must rest on top of the girder with a length of not less than 4 ins. This is thin metal and will surely straighten under the load,besides which it does not offer enough body to resist a minimum thickness of f in. The stirrup shown in Fig. 62is double and the weight of the beam on either side tends to bal-ance the weight of the
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