By Jai B. Kim, Robert H. Kim, Jonathan Eberle
Developed to conform with the 5th variation of the AASHTO LFRD Bridge layout Specifications ––Simplified LRFD Bridge layout is "How To" use the standards ebook. such a lot engineering books make the most of conventional deductive practices, starting with in-depth theories and progressing to the appliance of theories. The inductive strategy within the booklet makes use of substitute methods, actually instructing backwards. The ebook introduces subject matters by way of offering particular layout examples. Theories should be understood by means of scholars simply because they seem within the textual content merely after particular layout examples are provided, setting up the necessity to comprehend theories.
The emphasis of the booklet is on step by step layout techniques of street bridges by way of the LRFD procedure, and "How to take advantage of" the AASHTO necessities to unravel layout problems.
Some of the layout examples and perform difficulties lined include:
- Load combos and cargo factors
- Strength restrict states for superstructure design
- Design stay Load HL- 93
- Un-factored and Factored layout Loads
- Fatigue restrict kingdom and fatigue lifestyles; provider restrict State
- Number of layout lanes
- Multiple presence issue of reside load
- Dynamic load allowance
- Distribution of dwell quite a bit in keeping with Lane
- Wind so much, Earthquake Loads
- Plastic second ability of composite steel-concrete beam
- LRFR Load Rating
Simplified LRFD Bridge layout is a examine advisor for engineers getting ready for the PE exam in addition to a school room textual content for civil engineering scholars and a reference for training engineers. 8 layout examples and 3 perform difficulties describe and introduce using articles, tables, and figures from the AASHTO LFRD Bridge layout requisites. every time articles, tables, and figures in examples seem through the textual content, AASHTO LRFD specification numbers also are pointed out, in order that clients can cross-reference the material.
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Constructed to conform with the 5th variation of the AASHTO LFRD Bridge layout requirements ––Simplified LRFD Bridge layout is "How To" use the necessities ebook. so much engineering books make the most of conventional deductive practices, starting with in-depth theories and progressing to the appliance of theories.
Extra info for Simplified LRFD Bridge Design
The overall width of the bridge is 48 ft and the clear (roadway) width is 44 ft, 6 in. Design the superstructure of a reinforced, cast-in-place concrete T-beam bridge using the following design specifications. The three Load Combination Limit States considered are Strength I, Fatigue II, and Service I. 1-2. 1 T-beam design example. Find the flange width and web thickness. A Art. 1 For the top flange of T-beams serving as deck slabs, the minimum concrete deck must be greater than or equal to 7 in.
A Tbl. 070 (50 ft × 12 in) = 42 in. Try h = beam width = 44 in. Find the effective flange width. A Art. 1 Find the effective flange width, where be effective flange for exterior beams in bi effective flange width for interior beams in bw web width 18 in L effective span length (actual span length) 50 ft S average spacing of adjacent beams 10 ft ts slab thickness 9 in The effective flange width for interior beams is equal to one-half the distance to the adjacent girder on each side of the girder, bi = S = 10 ft × 12 in = 120 in The effective flange width for exterior beams is equal to half of one-half the distance to the adjacent girder plus the full overhang width, be = ½ (10 ft × 12 in) + (4 ft × 12 in) = 108 in Find the interior T-beam section.
2 Live Load Distribution Factors Live load distribution factors in AASHTO are lane-load distributions, not wheel-load distributions as they were in the AASHTO Standard Specifications for Highway Bridges, 17th edition, 2002. A Art. 2: Appendices A–D The distribution factors are included in several AASHTO articles, and important provisions are in AASHTO Sec. 4. The live load moment and shear for beams or girders are determined by applying the lane fraction (distribution factor) in AASHTO Art. 2 to the moment and shear due to the loads assumed to occupy 10 ft.