we quote the ultimate tensile strength of the bolt – this is the benchmark for strength statements (. shear strength is some fraction of ultimate tensile strength) | Role of the Structural High-Strength Bolts The Basics Fundamentals and Behavior AISC Specification Requirements Engineer. Selection of suitable bolt types and grades Design of the fasteners Responsibility for installation Responsibility for inspection ASTM A307 Bolts often a good choice when loads are static strength level inferior to high-strength bolts 60 ksi tensile ult. pretension indeterminate ASTM A325 Bolts Type 1 or Type 3 weathering steel ASTM Spec. RCSC Spec. Minimum tensile strength 120 ksi Pretension can be induced if desired ASTM A490 Bolts Types 1 or Type 3 weathering steel Minimum tensile strength 150 ksi maximum 170 ksi ASTM Spec. RCSC Spec. Pretension can be induced if desired 1 Comments. Note we quote the ultimate tensile strength of the bolt - this is the benchmark for strength statements . shear strength is some fraction of ultimate tensile strength What about yield strength What is proof load .comments cont d Nuts ASTM A563 Washers if needed ASTM F436 Bolt - nut - washer sets implied so far but other configurations available Loading of Bolts Shear - load transfer by shear in bolt and bearing in connected material OR - load transfer by friction followed by shear and bearing Tension Combined Tension and Shear Shear Loading cont d Bolts Loaded in Tension Bolts in Tension - prying bolts in tension shear High-strength bolts in tension can be a source of problems 2 Bolts in combined tension and shear Consider a simple joint bolts in shear bolts in combined shear and tension Finally. ST and associated shear stress P T A note that this force is equal and opposite to the bearing force shown previously In the example we identified. the force in the bolt a shear force the force that the bolt imposed on the plate a bearing force the force in the plate itself a tensile force force transfer could also be by friction not included in this illustration AISC Standard 2005 Parallel LRFD and ASD rules LRFD uses a resistance factor 0 ASD uses a safety factor Q .
