What is approach slab in bridges?

What is approach slab in bridges?

Approach slab (relieving slab, run-on slab or transition slab) describes the reinforced concrete slab which supports the road-surface at the transition from an approach embankment to a bridge abutment or culvert or adjacent to a retaining wall.

How thick is an approach slab?

It is unlikely that approach slabs will fail structurally because of their thickness (typically 15-inches) and the large amount of reinforcing steel in the bottom.

How thick should a bridge slab be?

Most jurisdictions require a minimum deck thickness of 8 in., including the ½ inch integral wearing surface. In addition to the minimum deck thickness requirements of S9. 7.1. 1, some jurisdictions check the slab thickness using the provisions of S2.

What is apron slab?

What is an apron slab? An apron slab is a smooth impermeable surface constructed around a water point to prevent spilt water soaking into the ground.

What is transition slab?

For longer bridges, a transition slab is used to accommodate the larger movements occurring at the bridge ends, avoiding the formation of transverse bumps and dips as well as cracking of the pavement.

Why do we need an approach slab?

(1997), the primary functions of approach slabs are to (1) span voids that may develop below the approach slab, (2) provide a ramp for differential settlement leading to the bridge abutment, and (3) provide a better seal against water percolation to prevent the erosion of backfill material.

What is span length of bridge?

Span is the distance between two intermediate supports for a structure, e.g. a beam or a bridge. A span can be closed by a solid beam or by a rope. The first kind is used for bridges, the second one for power lines, overhead telecommunication lines, some type of antennas or for aerial tramways.

What is the height of the bridge?


Rank Name Structural height
1 Millau Viaduct 336.4 metres (1,104 ft)
2 1915 Çanakkale Bridge 334 metres (1,096 ft)
3 Pingtang Bridge 332 metres (1,089 ft)
4 Hutong Yangtze River Bridge 325 metres (1,066 ft)

What is bridge design?

Bridge is a structural design pattern that lets you split a large class or a set of closely related classes into two separate hierarchies—abstraction and implementation—which can be developed independently of each other.

What is suspended slab?

Suspended slabs are slabs that are not in direct contact with the ground. They form roofs or floors above ground level. Suspended slabs are grouped into two types: one way slabs which are supported on two sides. two way slabs which are supported on all four sides.

What is a bridge approach slab?

The Bridge Approach Slab (Minor) is a contractor-option slab consisting of two subclasses of slabs: either an optional lesser reinforced concrete slab, or an optional asphalt slab. A reinforced concrete Bridge Approach Slab (Major), as well as the concrete approach pavement shown on Standard Plan 504.00, shall be used on all major routes.

Is a concrete bridge approach slab a QA requirement?

A concrete bridge approach slab is not subject to the Quality Control/Quality Assurance (QC/QA) requirements of Sec 502 of the Standard Specifications. Concrete bridge approach slabs shall be cured and sealed in accordance with Sec 703 of the Standard Specifications for bridge decks.

What are the dimensions of the edges of approach slab?

All edges of the approach slab shall have 1/2″ (in) radii except at longitudinal construction joints and adjacent to L-Type abutments. Longitudinal joints shall be placed on lane lines and shall be constructed and sealed in accordance with J: Standard Specification Section 5-05.3(8). Joints may be either a sawcut crack control joint or a

What are the requirements for approach slabs constructed with asphalt?

Requirements for approach slabs constructed with asphalt will be in accordance with the either Sec 401 or Sec 403, as determined by the mix type to be specified on the plans.