By George C. Lee, Ernest Sternberg
A multidisciplinary and available advent to humanity’s favourite constitution: the bridge.
Whether you're a scholar contemplating a profession in civil engineering and transportation making plans, a public legitimate drawn to the way forward for infrastructure, or someone who easily cares approximately bridges, this publication bargains an available and illustrated advent to the main liked function of our equipped setting. know about engineering fundamentals: the forces that bridges needs to face up to to stick aloft and the rules during which engineers come to a decision which varieties of bridges make experience at which websites. learn the way engineers shield bridges from their maximum threats—the earthquakes, floods, and different risks that could reason catastrophic damage.
relocating from engineering to making plans, learn the way we choose no matter if a bridge is worthy development within the first position, know about debatable good points of cost-benefit research, and concerning the transportation types wherein planners forecast bridge results on site visitors styles. examine a occasionally intractable challenge: why a venture frequently creeps alongside for a decade or extra to get from preliminary reports to the day the ribbon is reduce, present process gigantic fee escalations. additionally discover the environmental impression of bridges, and the that means of a “sustainable bridge,” and no matter if bridges may possibly once more be equipped, like historic Roman ones, to final one thousand years.
“Authoritative, complete, and enjoyable to learn, this booklet is for everybody drawn to bridges, from the lay reader to the techie who likes to work out how issues paintings. It will also function an outstanding better half to starting layout scholars in structure and engineering, and it's going to be on the shelf of civil engineers, architects, and contractors, too.” — Robert E. Paaswell, urban university of recent York
“This paintings might help knowledgeable yet nonspecialist selection makers to understand the complexity of bridge layout, building, and upkeep in making judgements that effect bridges.” — Niraj Verma, Virginia Commonwealth college
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Additional info for Bridges: Their Engineering and Planning
7). 7. Truss bridge. 45 BRIDGE TYPES AND SITES SUSPENSION BRIDGES The immediately recognizable feature of the suspension bridge is the pair of cables extending from one side of a channel across two towers to the other side. Once a cable is suspended between the towers and anchored into the ground at both ends, it takes on its distinctive, graceful shape. Hangers extend downward from the cable to support the deck. Certainly the cable must be strong enough to support enormous loads. It consists of thousands of steel wires bound together, the whole cable then securely attached to an anchorage on each shore.
11. Piers—footings and foundations. Spread Footing 50 BRIDGES elements, which are smaller and easier to transport. In short, nearness of industry, nearness of labor skills, and construction-site features can all affect bridge selection. Traffic projections, maintenance methods over time, hazard prevention (as from coastal surge due to hurricane), and esthetic judgment all count. Most of all, there is always the master consideration, cost. To give just one rule of thumb: adding one more span to a multispan bridge adds one more pier plus the work of attaching the added girder.
FOUR BRIDGE TYPES AND SITES Any bridge is an assemblage of structural members, such as beams, piers, slabs, cables, stays, and arches. The bridge designer must select the members’ materials, sizes, and shapes and then properly interconnect the members, so as to provide safe but cost-effective crossings. Through thousands of years of human experience with bridges, designers have discovered and sometimes rediscovered that certain structural configurations are especially well suited to the task. These are the bridge types to which we now turn.