Table of Contents
How long is a bridge girder?
Girder bridges are most commonly used for straight bridges that are 33-650 feet (10-200 m) long, such as light rail bridges, pedestrian overpasses, or highway fly-overs. The longest girder bridge in the world is 2,300 feet (700 m) long and located in Brazil.
What is the maximum length of the beam bridge?
Pre-stressed concrete also tends to be one of the least expensive materials in construction. But even the best materials can’t compensate for the beam bridge’s biggest limitation: its length. The farther apart its supports, the weaker a beam bridge gets. As a result, beam bridges rarely span more than 250 feet.
What is length of each girder?
Each girder has a cantilever length of 48 m and an I- shaped cross-section with dimensions shown in the figure. The load on each girder (during construction) is assumed to be 9.5 kN/m, which includes the weight of the girder. Determine the maximum bending stress in a girder due to this load.
What is the optimal length of a bridge?
For bridges with three or more spans, the optimum length of the end span is usually from 0.7 to 0.85 of the adjacent internal span length.
What is steel girder bridge?
Girder bridges are the simplest bridge type in structure and consist of steel beams shaped to an I-section or box section, called a plate girder bridge or a box girder bridge, respectively. Girder bridges are comprised of deck slabs, on which vehicles and people pass, and of main girders supporting the deck slabs.
How much weight can a steel bridge hold?
The Federal-Aid Highway Act Amendments of 1974 established the bridge formula as law, along with the gross weight limit of 80,000 pounds (36,000 kg). Current applications of the formula allow for up to 7 axles and 86 feet or more length between axle sets, and a maximum load of 105,500 lbs.
What is the maximum span used in welded construction of plate girders?
Plate girder bridges are the bridges having their main carrying structural system made of plate I-shaped girders, which are suitable for simply supported spans up to 40m.
How do you measure bridge length?
Formula: length of bridge = (speed of train * time taken to cross bridge) – length of train.
What is a long span bridge?
Long-span bridges have traditionally employed suspension or cable-stayed forms, comprising vertical pylons and networks of cables supporting a bridge deck.