Table of Contents
What is load combination?
A load combination results when more than one load type acts on the structure. Building codes usually specify a variety of load combinations together with load factors (weightings) for each load type in order to ensure the safety of the structure under different maximum expected loading scenarios.
What is load bridges?
Live load refers to traffic that moves across the bridge as well as normal environmental factors such as changes in temperature, precipitation, and winds. DYNAMIC LOAD. Dynamic load refers to environmental factors that go beyond normal weather conditions, factors such as sudden gusts of wind and earthquakes.
How many types of load combinations are there?
1.2D + 1.0W + L+0.5(Lr or S or R) 1.2D + 1.0E + L +0.2S. 0.9D + 1.0W. 0.9D + 1.0E.
What are IRC loads?
IRC Class A Loading This type of loading is used in the design of all permanent bridges. It is considered as standard live load of bridge. When we design a bridge using class AA type loading, then it must be checked for class A loading also.
How do you calculate load combinations?
The resulting load combination would be 0.50 * (1.0D + 0.7L + 0.3E). Enter the numeric value to be applied to each type of load. When either of these two values is non-zero, the module will calculate the weight of each member (as cross sectional area * density * length) and consider that weight during the analysis.
What is the load that a bridge supports?
Dead and live weight are essentially vertical loads, whereas forces from nature may be either vertical or horizontal. Wind causes two important loads, one called static and the other dynamic. Static wind load is the horizontal pressure that tries to push a bridge sideways.
What are the loads to be considered in bridge designing?
Various design loads to be considered in the design of bridges are:
- Dead load.
- Live load.
- Impact load.
- Wind load.
- Longitudinal forces.
- Centrifugal forces.
- Buoyancy effect.
- Effect of water current.
What is load and types of load?
The types of loads acting on structures for buildings and other structures can be broadly classified as vertical loads, horizontal loads and longitudinal loads. The vertical loads consist of dead load, live load and impact load. The horizontal loads comprises of wind load and earthquake load.
Is code for bridge design?
∴ The correct answer is IRC – 6.
What are the design loads acting on bridges?
Various types of loads are considered for design of bridge structures. These loads and their combinations decides the safety of the bridge construction during its use under all circumstances. The design loads should be considered properly for perfect design of bridge. Different design loads acting on bridges are explained below.
What is the impact factor of IRC on bridges?
To consider impact loads on bridges, an impact factor is used. Impact factor is a multiplying factor which depends upon many factors such as weight of vehicle, span of bridge, velocity of vehicle etc. The impact factors for different IRC loadings are given below.
What are the impact factors for different IRC loadings?
The impact factors for different IRC loadings are given below. 25\% up to 5m and linearly reducing to 10\% from 5 m to 9 m. If the length exceeds in any of the above limits, the impact factor should be considered from the graph given by IRC which is shown below. For bed blocks, I f = 0.5 4. Wind Loads
What are the different elements of bridge design?
The different elements of bridge are deck slab, wearing coat, railings, parapet, stiffeners and other utilities. It is the first design load to be calculated in the design of bridge. 2. Live Load The live load on the bridge, is moving load on the bridge throughout its length.