2007-04-23 02:19:57 · 4 answers · asked by cya 1 in Science & Mathematics ➔ Engineering
Live load distribution factors have been used in bridge design for decades as a simple method with which to estimate live load effects. Live load distribution is important for the design of new bridges as well as for the evaluation of existing bridges. AASHTO's "Standard Specifications for Highway Bridges" and the "LRFD Bridge Design Specifications" contain the most common methods in use for computing live load distribution factors. The load and resistance factor design (LRFD) equations were developed under NCHRP Project 12-26 and reflect the wide variation in modern bridge design.
That is a start. I hope you consider a lot of other factors as well when you design your bridge.
2007-04-23 02:32:31 · answer #1 · answered by Durai 3 · 1⤊ 0⤋
The dead load involves the weight of the structure itself.
The live load involves the combined weight or force of everything else the structure has to either support or resist.
These live loads will include the weight of the people, trucks trains plus the weights of cargo. The live load includes how these loads are likely to be distributed and consideration of the worst cases to be expected. The live load includes hurricane force winds, snow, ice, rain, the dynamics of anticipated earthquakes, waves, impact by ships and barges.
Building and industry codes specify the minimum requirement. Sometimes these are inadequate. The selection of design safety factors will take the unanticipated (Murphy's Laws) into account.
The other live load to be resisted is the push by the accountants to cut cost by reducing safety margins.
2007-04-23 05:26:57 · answer #2 · answered by Bomba 7 · 0⤊ 0⤋
For designing bridges,it depends on mainly Live load and dead load.Dead load is the load of structure(which is not moving).Live load is that load which expected to be moving on bridges like buses,truck,cars and transport machinery...we take axial loads and impact of horizontal load while vehicle moving at specified speed.
2007-04-23 04:07:11 · answer #3 · answered by shabbir s 3 · 0⤊ 0⤋
live loads and their distribution are strictly defined by the governing code. In the USA, AASHTO defines the live load and its distribution to the superstructure. Live load distribution depends mainly on the superstructure type such as steel girders parallel to traffic, steel floor beams perpendicular to traffic, conrete girders, timber, concrete box beams, etc.
2007-04-23 03:53:41 · answer #4 · answered by minorchord2000 6 · 0⤊ 0⤋