155Chapter 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 twogroups: 1.those leading to collapse, referred to as ultimate limit states(ULS); and 2.those which disrupt the useof structures, but do not cause collapse, referred to as serviceability limit states(SLS). •Two major serviceability limit states for RC structures: oexcessive deflection. The appearance or efficiency of a structure or any part of a structure must not be adversely affected by deflections. oexcessive 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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