Mechanics of engineeringComprising statics and dynamics of solids: and the mechanics of the materials of constructions, or strength and elasticity of beams, columns, arches, shafts, etc . ng, the design of either the arch or the loadingmust be changed ; since, although the arch may stand,from the resistance of the spandrel walls, such a stabilitymust be looked upon as precarious and not countenancedin any large important structure. (Yery frequently, insmall arches of brick and stone, as they occur in buildings,the cement is so tenacious that the whole structure is vir-tually a single continuou
Mechanics of engineeringComprising statics and dynamics of solids: and the mechanics of the materials of constructions, or strength and elasticity of beams, columns, arches, shafts, etc . ng, the design of either the arch or the loadingmust be changed ; since, although the arch may stand,from the resistance of the spandrel walls, such a stabilitymust be looked upon as precarious and not countenancedin any large important structure. (Yery frequently, insmall arches of brick and stone, as they occur in buildings,the cement is so tenacious that the whole structure is vir-tually a single continuous mass). When the true linear arch has once been determined,the amount of the resultant pressure on any joint is givenby the length of the proper ray in the force diagram. 428 MECHANICS OF ENGINEERING. ARRANGEMENT OF DATA FOR GRAPHICTREATMENT. 353. Character of Load.—In most large stone arch bridgesthe load (permanent load) does not consist exclusively ofmasonry up to the road-way but partially of earth fillingabove the masonry, except at the faces of the arch wherethe spandrel walls serve as retaining walls to hold theearth. (Fig. 384). If the intrados is a half circle or half-. Fig. 384. Fig. 385. ellipse, a compactly-built masonry backing is carried upbeyond the springing-line to AB about 60° to 45° from thecrown, Fig. 385; so that the portion of arch ring belowAB may be considered as part of the abutment, and thusAB is the virtual springing-line, for graphic treatment. Sometimes, to save filling, small arches are built overthe haunches of the main arch, with earth placed overthem, as shown in Fig. 386. In any of the preceding cases
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectenginee, bookyear1888
