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Lecture_19 - Chapter Four Serviceability 4.1 Serviceability...

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155 Chapter Four _____________________________________________________________________ Serviceability 4.1 Serviceability Limit States of Deflection and Cracking 4.1.1 Serviceability limit states Review: The limit states (states at which a structure becomes unfit for its intended function) are generally divided into two groups: 1. those leading to collapse , referred to as ultimate limit states (ULS); and 2. those which disrupt the use of structures, but do not cause collapse, referred to as serviceability limit states (SLS). Two major serviceability limit states for RC structures: o excessive deflection . The appearance or efficiency of a structure or any part of a structure must not be adversely affected by deflections. o excessive crack width . The appearance or durability of a structure or any part of a structure must not be adversely affected by any cracking of the concrete.
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