ch06 - CHAPTER 6 6.1 Several factors make it very...

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Unformatted text preview: CHAPTER 6 6.1 Several factors make it very difficult to accurately estimate the magnitudes of deflections. These include the problems of controlling field work, the varying ages of concretes when the forms are removed, the imperfect estimation of the magnitudes of member and restraints, the difficulties of estimating the effective moments of inertia of the various members, andeso on. 6.2 Long term deflections are caused by shrinkage and creep. in detail the factors affecting the magnitudes of shrinkage and creep and thus long term deflections are humidity, temperature, curing conditions, amounts of compression steel used, ratio of stress to strength, and the age of the concrete at the time of loading. 6.3 The deflections of reinforced concrete'bemns can be limited by increasingmember depths, by cambering the members and by using compression reinforcing. 6.4 It is necessary to limit the width of concrete cracks to certain maximum values so . the appearances ofthe structures are not spoiled. In addition limitations on crack widths probably help to reduce the corrosion of the reinforcing. 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ch06 - CHAPTER 6 6.1 Several factors make it very...

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