7. Briefly explain any two types of bridges
Answers
Answer:Types of Bridges
Over the last several thousand years, bridges have served one of the most important roles in the development of our earliest civilizations, spreading of knowledge, local and worldwide trade, and the rise of transportation. Initially made out of most simple materials and designs, bridges soon evolved and enabled carrying of wide deckings and spanning of large distances over rivers, gorges, inaccessible terrain, strongly elevated surfaces, and pre-built city infrastructures. Starting with the 13th century BC Greek Bronze Age, stone arched bridges quickly spread all around the world, eventually leading to the rise of the use of steel, iron, and other materials in bridges that can span kilometers.
I know you just asked for 2 types of bridges briefly but I just gave you this information in case if you have a dought.
two types of bridges are -
1. Arch bridges
– use the arch as a main structural component (arch is always located below the
bridge, never above it). With the help of mid-span piers, they can be made
with one or more arches, depending on what kind of load and stress forces
they must endure. The core component of the bridge is its abutments and pillars, which have to be built strong
because they will carry the weight of the entire bridge structure and
forces they convey.
2. Beam bridges – employ the simplest of forms – one or several horizontal beams that can either simply span the area between abutments or relieve some of the pressure on structural piers. The core force that impacts beam bridges is the transformation of vertical force into shear and flexural load that is transferred to the support structures (abutments or mid-bridge piers).
Explanation:
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Answer:
Explanation:
Arch
The arch bridge carries loads primarily by compression, which exerts on the foundation both vertical and horizontal forces. Arch foundations must therefore prevent both vertical settling and horizontal sliding. In spite of the more complicated foundation design, the structure itself normally requires less material than a beam bridge of the same span.
Cantilever
A beam is said to be cantilevered when it projects outward, supported only at one end. A cantilever bridge is generally made with three spans, of which the outer spans are both anchored down at the shore and cantilever out over the channel to be crossed. The central span rests on the cantilevered arms extending from the outer spans; it carries vertical loads like a simply supported beam or a truss—that is, by tension forces in the lower chords and compression in the upper chords. The cantilevers carry their loads by tension in the upper chords and compression in the lower ones. Inner towers carry those forces by compression to the foundation, and outer towers carry the forces by tension to the far foundations.