| 摘要 |
A RACKING BEAM (10) INCLUDES TOP AND BOTTOM FLANGES (12, 13) AND AT LEAST ONE-WEB -(14) THAT INTERCONNECTS THE FLANGES. THE WEB INCLUDES AT LEAST ONE STIFFENING FORMATION (16) ARRANGED TO STIFFEN AN INTERMEDIATE REGION OF THE WEB ALONG AT LEAST A SUBSTANTIAL PORTION OF ITS LENGTH SO AS TO RESIST LATERAL LOADING APPLIED TO THE BEAM (10). THE RACKING BEAM MAY TAKE VARIOUS FORMS. IN ONE FORM THE BEAM IS MANUFACTURED FROM FIRST AND SECOND U-SHAPED SECTIONS THAT ARE IN OPPOSED ABUTTING RELATIONSHIP. IN ANOTHER FORM, THE BEAM IS FORMED AS A CLOSED S-SHAPED PROFILE.
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