Control of Concrete Cracking in Bridges (2017) / Chapter Skim
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Pages 44-53
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From page 44... ...
44 Yield Strength of reinforcement It is generally accepted that crack widths in nonprestressed concrete members increase as the tensile stress in the reinforcement increases. Consequently, the use of higher strength reinforcement will lead to wider crack widths unless an upper limit is placed on the tensile stress in the reinforcement under service loads.
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From page 45... ...
45 that corrosion-resistant reinforcing bars can be used in bridge construction with relative ease. No information about the effect on cracking was reported.
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From page 46... ...
46 sudden and propagated toward the compression zone as soon as the concrete stress reached its tensile strength. Crack spacing was determined by the stirrup spacing.
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48 fcpe = compressive stress in concrete caused by effective prestress forces only (after allowance for all prestress losses) at extreme fiber of section where tensile stress is caused by externally applied loads (ksi)
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From page 49... ...
49 The intent of the article is to control flexural cracking in which the crack width is assumed to be proportional to its distance from the neutral axis as represented by βs. However, most cracks in the bridge decks are caused by restrained shrinkage, differential temperatures, or discontinuities in the supporting beams or slabs.
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50 • If vu ≥ 0.125 f ′c, then: s dv )
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From page 51... ...
51 For pretensioned I-girders or bulb tees, h is the overall height of the member. For pretensioned solid or voided slabs, h is the overall width of the member.
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From page 52... ...
52 article 5.10.6 (formerly 5.10.8) : Shrinkage and temperature reinforcement Article 5.10.6 contains requirements for minimum amounts of reinforcement at each face to control shrinkage and temperature stresses in members exposed to daily temperature changes and in structural mass concrete.
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From page 53... ...
53 direction perpendicular to the primary reinforcement at a percentage of the amount of primary reinforcement. Checking of bar spacing to control flexural crack widths per Article 5.6.7 (formerly 5.7.3.4)
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