Design Loads For Decks

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Design Loads For Decks

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Few published listings of design load values were found. It appears that the main reason is widespread reliance on classification society design rules.Table 3.3 Guidelines for defining a live load Uniform load beams and decking kN/m2 [lbs/ft2] Concentrated line load on decking kN/m0[lbs/ft] Concentrated load on beams kN[kips] Walkways and stairs 4.79 kN/m2 [100] 4.378 kN/m0 [300] 4.44 kN [1] Areas over 400 ft2 3.11 kN/m2 [65] Areas of unspecified light use 11.97 kN/m2 [250] 10.95 KN/m0 [750] 267 KN [60] Areas where specified loads are supported directly by beams 7.3 KN/m0 [500] Table 3.4 Guidelines for decks carrying a Michael F. Petrou^ and Philip C. Perdikaris^ DESIGN OF REINFORCED CONCRETE BRIDGE DECKS UNDER MOVING LOADS REFERENCE:

Petrou,.M. F. and Perdikaris, P. C, "Design of Reinforced Concrete Bridge Decks Under Moving Loads," Effects of Product Quality and Design Criteria on Structural Integrity, ASTM STP 1337, R. C. Rice and D. E. Tritsch, Eds., American Society for Testing and Materials, 1998. ABSTRACT: This paper presents design recommendations of This information intended for developing new AASHTO load models for evaluation in NCHRP 1263 can be a valuable resource for developing new axle loads for deck design as the data repre Figure 8. Truck with tridem and quad axles. 15 15 22.5 22.5 11' 4' 4' sents service loads that the new decks will be subjected to on a routine basis. This has implications for the strength and fatigue design

provisions.for decks in the current LRFD specifications. Current provisions may be grossly Steel Deck. If buggies are used, the deck shall be planned to prevent damage. Contractor shall not exceed the SDI construction loads during either concrete placement or finishing. Ponding of concrete and large screed machines or buggies should be avoided unless special project loading is defined in the contract documents and maximum unshored spans are determined prior to approval of the erection layout. 2. Calcium chloride (or any admixture containing chloride salts) shall not The use of GFRP bars in lightweight concrete decks and traffic railings is not recommended because of a lack of research data. C1.4 The limit states specified herein

are.intended to provide for a buildable, serviceable bridge, capable of safely carrying design loads for a specified lifetime. 2.5—GENERAL DESIGN REQUIREMENTS 2.5.1—Deck Drainage Cross and longitudinal slopes of. All rights reserved. Duplication is a violation of applicable law. 2 BRIDGE DESIGN GUIDE lateral support and thus much greater stiffness than a non composite beam of equal depth, loads, and span length. Also, better economy is possible because of longer beam and girder spans (up to 30 feet and more) and fewer columns. A typical composite steelandmetal deck floor system might consist of an 18gage metal deck supported by beams spaced at 8 or 10foot centers, which themselves are connected to girders spanning 30 to 32 feet. A

concrete.floor consisting of 212" of Load. effects. in. deck. slab. The load effects in the slab arise from two sources, the global composite action with the steel girders and the local action in distributing the loads from individual wheels. It is convenient to calculate the effects from the two sources separately. The load effects in the slab from global action are longitudinal stresses due to bending of the composite beams and transverse stresses due to the bending of the slab as the main beams deflect under load. The moments Details of the traffic loads to be considered for road, railway and footbridges are given in section 2.4.8 and Tables 2.5 and 2.6. Details of structural design requirements, including the load

combinations.to be considered, are given in section 21.2 and Tables 3.2 and 3.3. The application of traffic load to any one area of a bridge deck causes the deck to bend transversely and twist, thereby spreading load to either side. The assessment of how much of the load is shared in this way, and the 

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