BRIDGES: CONNECTING HUMANS THROUGH THE AGES

Daria Prikhodko 627 gr.

TYPES OF BRIDGES•BEAM BRIDGE•CANTILEVER BRIDGE•ARCH BRIDGE•SUSPENSION BRIDGE•CABLE-STAYED BRIDGE•MOVABLE BRIDGE•DOUBLE-DECKED BRIDGE

BEAM BRIDGE•A beam or "girder" bridge is the simplest kind of bridge

•Under load, the beam's top surface is pushed down or compressed while the bottom edge is stretched or placed under tension

A wooden-decked beam bridge on stone abutments. 38th Street Bridge

Feiyunjiang Bridge

CANTILEVER BRIDGE•Cantilever bridges are built using cantilevers—horizontal beams that are supported on only one end.

•Huge pillars take up the compression which are held up by the narrow top members. Attached to these are the complicated struts and cross bracing which withstand the forces causing buckling and twisting

Forthrail bridge

Howrah Bridge at night

Pierre Pflimlin Bridge

Quebec Bridge Construction 1917

ARCH BRIDGE•Arch bridges are one of the oldest types of bridges and have been around for thousands of years

•The load at the top of the key stone makes each stone on the arch of the bridge press on the one next to it. This happens until the push is applied to the end supports or abutments, which are embedded in the ground

•The ground around the abutments is squeezed and pushes back on the abutments

•For every action there is an equal and opposite reaction. The ground which pushes back on the abutments creates a resistance which is passed from stone to stone, until it is eventually pushing on the key stone which is supporting the load

Acueducto Segovia Ponte Vecchio

Pont du gard

Pont du Diable Gaoliang Bridge

Cold Spring Arch bridge

Sheikh Rashid bin Saeed Crossing Dubai 2012

SUSPENSION BRIDGE•Suspension bridges in their simplest form were originally made of rope and wood.•Modern suspension bridges use a box section roadway supported by high tensile strength cables

•Cables are capable of withstanding tension but offer no resistance to compression

Great Belt Bridge

Akashi Kaikyō Bridge Bosphorus Bridge

Bosphorus Bridge panorama

CABLE-STAYED BRIDGE•A cable-stayed bridge is a bridge that consists of one or more columns, with cables supporting the bridge deck

Juscelino Kubitschek bridge

Bandra–Worli Sea Link Ponte Estaiada

MOVABLE BRIDGES

•Movable bridges are designed to move out of the way of boats or other kinds of traffic, which would otherwise be too tall to fit. These are generally electrically powered

•Drawbridge - the bridge deck is hinged on one end

•Tilt bridge - the bridge deck, which is curved and pivoted at each end, is lifted up at an angle

•Curling bridge - a drawbridge with multiple sections that curl vertically

•Rolling bascule bridge - an unhinged drawbridge which is lifted by the rolling of a large gear segment along a horizontal rack

•Bascule bridge - a drawbridge hinged on pins with a counterweight to facilitate raising

•Folding bridge - a drawbridge with multiple sections that collapse together horizontally

•Submersible bridge - also called a ducking bridge, the bridge deck is lowered down into the water

•Swing bridge - the bridge deck rotates around a fixed point, usually at the center, but may resemble a gate in its operation

•Table bridge - a lift bridge with the lifting mechanism mounted underneath it

•Retractable bridge (Thrust bridge) - the bridge deck is retracted to one side

•Transporter bridge - a structure high above carries a suspended, ferry-like structure

•Lift bridge - the bridge deck is lifted up by counterweighted cables mounted on towers

Government Bridge

Paddington Basin Bridge

Bridge over the river grim

Double-decked bridge

•A double-decker is a vehicle that has two levels for passengers or cargo, one deck above the other

Amur Bridge

Oberbaum bridge

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