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【正文】 um at the supports and zero at midspan) and a parabolic moment distribution (zero at the supports and maximum at midspan). The KCS joist is a new type of KSeries joist developed to overe some of the limitations of the standard KSeries joist. The KCS joist may be used for special design applications requiring a joist capable of supporting nonuniform loads, concentrated loads, or binations thereof in addition to or independent of the normal uniform load. The KCS joists are designed in accordance with the SJI Standard Specifications for KSeries joists and range in depth from 10 in. to 30 in. Load tables furnished by the SJI provide the shear and moment capacity of each joist. The designer must calculate the maximum moment and shear imposed and then select the appropriate KCS joist. 93 Floor Vibrations Even when the structural design of the steel joists is acplished in accordance with design specifications, a floor system may be susceptible to undesirable vibrations. This phenomenon is separate and different from strength and has to do mainly with the psychological and physiological response of humans to motion. Large open floor areas without floortoceiling partitions may be subject to such undesirable vibrations. The ASDS Commentary remends a minimum depthtospan ratio of 1/20 for a steel beam supporting a large open floor area free of partitions. In addition, the SJI requires a minimum depthtospan ratio of 1/24 for steel joists, although a generally accepted practice for steel joist roofs and floors is to use a minimum depthtospan ratio of 1/20. Even if these remendations and requirements are satisfied, a vibration analysis should be made, particularly when a floor system is posed of steel joists that support a thinconcrete slab placed on steel metal
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