By W.F. Chen, Lian Duan
With chapters culled from the acclaimed Bridge Engineering guide, Bridge Engineering: Substructure layout makes a speciality of many of the elements comprising and affecting bridge substructures. those comprise bearings, piers and columns, towers, abutments and preserving constructions, footings and foundations, and bridge hydraulics. for every part, the contributing writer addresses some of the kinds of that part, discusses particular choice or layout standards, and offers thorough references. different suitable themes studied during this quantity contain geotechnical concerns, resembling box exploration strategies and location characterization, and designing bridges to reduce the possibility of and harm caused by vessel collisions.
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Additional info for Bridge Engineering: Substructure Design (Principles and Applications in Engineering)
Be designed for the concentrated load from the saddles at the top, if used, or for the local forces from the numerous anchorages of the cables framing into the tower shafts Towers designed in steel will be lighter than towers designed in concrete, thus giving a potential for savings in foundation costs. Steel towers will generally be more flexible and more ductile and can be erected in less time than concrete towers. Steel towers will require periodic maintenance painting, although weathering steel can be used for nonmarine environments.
Steel towers will require periodic maintenance painting, although weathering steel can be used for nonmarine environments. 7 Generic forms for towers of cable-stayed bridges. (a) Single tower, I; (b) double vertical shafts, H; (c) double cranked shafts; (d) inclined shafts, A; (e) inclined shafts, diamond; (f) inverted Y. The cost of steel or concrete towers can vary with a number of factors so that market conditions, contractor’s experience, equipment availability, and the design details and site-specific influences will most likely determine whether steel or concrete is the most economical material.
2003 by Taylor & Francis Group, LLC 3-15 Towers As the sloped legs are erected, the inclination may induce bending moments and lateral deflection in the plane of the slope of the legs. Both of these secondary effects must be adjusted by jacking the legs apart by a calculated amount of force or displacement to release the locked-in bending stresses. If the amount of secondary stress is small, then cambering the leg to compensate for the deflection and adding material to lower the induced stress can be used.