Essentials in the theory of framed structures . is placed at the middle of each panel in Fig. 121 and supportedby a sub-vertical, M3L3 for example, and the sub-tie MzUi isadded to prevent bending in TJiLi, the Baltimore truss ofFig. 122 is the result. In the end panel the sub-strut M1L2 isused. Sub-struts instead of sub-ties are frequently used inthe other panels, as shown in Fig. 92. 117. L4L6.—The center of moments for this member is atUi (Fig. 122) and the section is passed through the panel 4-5, Sec. V BRIDGES 185 and it is clear that the influence line is the same as for LJL^(Fig. 120) an
Essentials in the theory of framed structures . is placed at the middle of each panel in Fig. 121 and supportedby a sub-vertical, M3L3 for example, and the sub-tie MzUi isadded to prevent bending in TJiLi, the Baltimore truss ofFig. 122 is the result. In the end panel the sub-strut M1L2 isused. Sub-struts instead of sub-ties are frequently used inthe other panels, as shown in Fig. 92. 117. L4L6.—The center of moments for this member is atUi (Fig. 122) and the section is passed through the panel 4-5, Sec. V BRIDGES 185 and it is clear that the influence line is the same as for LJL^(Fig. 120) and LiX-^ (Fig. 121). Hence, the criterion formaximum stress is the same for all three members. The criti-cal wheel is at £,4, and one-third the total load on the span isplaced on the segment LoL^. The maximum tensile stressoccurring when wheel 13 is at Li, is 118. U2U4.—The stress in UiXJi (Fig. 121) is the same as thatin LJL,^, whereas in Fig. 122 the sub-tie MsUi introduces aslight complication. The center of moments is at Li, the. -—I2S>?5=300^ Fig. 120.
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectstructu, bookyear1922
