【Daily Question】【Civil Engineering Version 20180610】

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Which of the following does not belong to the component relationships in beam-supported stairs? ( ) A. The tread plates are placed on the diagonal beams. B. The platform beam is placed on the side walls. C. The diagonal beams are placed on the platform beam. D. The tread plates are placed on the side walls. Answer: D 【Explanation】When the side walls of the stairwell have sufficient load-bearing capacity, no diagonal beams are used on the side of the stair section that is against the load-bearing wall; instead, the wall itself supports that section of the stairs. In this case, one end of the tread plates is placed on the diagonal beam, while the other end is placed on the wall ； When the side walls of the stairwell are non-load-bearing or when there is an open space on both sides of the stairs, diagonal beams are installed on either side of the stair flight ； Sometimes, diagonal beams are placed in the middle of the staircase, creating a loading pattern in which the tread plates extend toward the two cantilevers.