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Structural Steel Designers Handbook Part 6

Tham khảo tài liệu 'structural steel designers handbook part 6', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | BUILDING DESIGN CRITERIA 6.35 where Cv 45 000kv Fy h 1t 2 when Cv 0.8 kv 190 k - h0 when Cv 0.8 5.34 . 4.00 . when a I h a I h 2 4.00 5.34 when a I h a I h 2 1.00 1.0 Alternative rules are given for design on the basis of tension field action. 6.14.2 Shear in Bolts For bolts and threaded parts design shear strengths are specified in Tables 6.20 and 6.21. The design strengths permitted for high-strength bolts depend on whether a connection is slip-critical or bearing type. Bearing type connections should be used where possible because they are more economical. Bearing-type joints are connections in which load is resisted by shear in and bearing on the bolts. Design strength is influenced by the presence of threads i.e. a bolt with threads excluded from the shear plane is assigned a higher design strength than a bolt with threads TABLE 6.20 Design Shear Strength of Fasteners in Bearing-Type Connections Description of fasteners Shear strength ksi LRFD ASD Nominal strength Allowable shear Fv A307 bolts 24 10.0 A325 bolts when threads are not excluded from shear planes 48 21.0 A325 bolts when threads are excluded from shear planes 60 30.0 A490 bolts when threads are not excluded from shear planes 60 28.0 A490 bolts when threads are excluded from the shear planes 75 40.0 Threaded parts when threads are not excluded from the shear planes 0.40F 0.17F Threaded parts when threads are excluded from the shear planes 0.50F 0.22F A502 grade 1 hot-driven rivets 25 17.5 A502 grades 2 and 3 hot-driven rivets 33 22.0 Resistance factor Ộ 0.75. 6.36 SECTION SIX TABLE 6.21 Allowable Shear Fv ksi for Slip-Critical Connections Long-slotted holes Type of bolt Standard-size holes Oversized and short-slotted holes Transverse loading Parallel loading A325 17 15 12 10 A490 21 18 15 13 Applies to both ASD and LRFD LRFD design for slip-critical connections is made for service loads. For LRFD Ộ 1.0. For LRFD when the loading combination includes wind or seismic loads the combined load effects at