What is the purpose of a box girder?
What is the purpose of a box girder?
Box girders are used for the construction of a cable-supported bridge, curved bridge, and footbridges. It is rarely used in buildings, but they may be used in special circumstances, such as when loads are carried eccentrically to the beam axis.
What are the different types of box girder bridges?
Types of Box Girder bridge
- Prestressed concrete Box Girder bridge.
- Structural steel Box Girder bridge (generally truss structure along with the metal box)
- Composite steel and Reinforced concrete Box Girder bridge.
What is prestressed box girder?
Prestressed concrete (PSC) box girders are concrete sections forming a boxed shape (rectangular or trapezoidal) supported by prestressed strands. These girders are widely used for footbridges, highway bridges, and railway bridges.
Why a box girder bridge is made hollow?
use in bridge construction The hollow box gave the deck the extra stiffness of a truss, but it was easier to build and required less engineering precision—at the cost, however, of extra material.
How do you build a box girder bridge?
One of the most commonly used forms of superstructure in concrete bridges is precast girders with cast-in-situ slab….Analysis and design of prestressed concrete box girder bridge.
| Eccentricity (mm) | Prestressing Force (kN) | The eccentricity which give minimum prestressing force (e) = 731mm |
|---|---|---|
| 650 | 17655.06 | |
| 731 | 16489.15 |
When was box girder bridge built?
The box girder was born out of a collaboration between Engineer Robert Stephenson, Iron Worker William Fairbairn and Professor Eaton Hodgkinson. The box girder was developed during the design and construction of the Britannia Bridge, constructed in 1850.
What is composite box?
Abstract. Composite box girders with corrugated steel webs and trusses is a new type of advanced bridge structure proposed recently. This kind of structure consists of a top concrete slab, corrugated steel webs and two bottom concrete-filled steel tubes connected by trusses.
Why is steel used for box girders?
Improved durability; reduced maintenance of protective coatings since the exposed surface is less and fewer edges are there and avoidance of exposed horizontal surfaces, no exposed bracing and stiffeners; Clean lines of a closed box girder provide better appearance for footbridges where the visual impact counts.
How are box girder bridges built?
[top]Composite box girders For highway bridges, the structural configuration is usually of a reinforced concrete deck slab, carrying the traffic, on top of steel girders. The deck slab acts compositely with the steel girders. The closed cell is formed by the reinforced concrete deck slab.
Who invented the box girder bridge?
How are box girder bridges constructed?
For steel box girders, the girders are normally fabricated off site and lifted into place by crane, with sections connected by bolting or welding. If a composite concrete bridge deck is used, it is often cast in-place using temporary falsework supported by the steel girder.
Is code for box girder bridge?
In present study a two lane simply supported Box Girder Bridge made up of prestressed concrete which is analysis for moving loads as per Indian Road Congress (IRC:6) recommendations, Prestressed Code (IS: 1343) and also as per IRC: 18 specifications.
What is a box girder bridge?
The box shape can be either trapezoidal or rectangular. In such girder, one of the flanges remains in compression and the other in tension. The Bridges with such girders are called Box girder bridges. Structural steel Box Girder bridge (generally truss structure along with the metal box) Composite steel and Reinforced concrete Box Girder bridge
What is a self-anchored suspension bridge?
A self-anchored suspension bridge is a type of bridge supported by the main cables anchored to the girder. External loads applied to suspension bridges are transferred to the girder through the suspenders main cables pylons and anchorage inside the girder. Therefore, unlike earth-anchored types, girders behave as bending and compression members.
What are suspenders on a suspension bridge?
Special types of suspenders are located at the center of any suspension bridge. These are used to restrict the relative displacement between the girders and main cables in order to suppress the deformation in the longitudinal direction of the girders, and alleviate the deflection angle of the suspenders in the lateral direction.
What is the difference between Box and truss girders?
Box girders have box shaped with orthogonal anisotropic reinforced sheet materials closed in a streamlined fashion. Compared to truss type girders, box girders are lighter and have closed shapes, resulting in high torsional stiffness. Furthermore, the streamlined shapes cause the girders to have low drag.
