In the formula for calculating the block shear strength of bolt connection, ie.,

Question

In the formula for calculating the block shear strength of bolt connection, ie., 3.9.5 on the text book, it contains 0.6 F_u. What is the physical meaning of 0.6 F_u? If bolt diameter is d_b = 1.5". what is the typically used spacing between bolts i bolt connection? For a plate subject to tension load, the design tension is T_u = 190 kips, it is the nominal tension capacity of the plate is T_n = 200 kips and the corresponding strength red factor for the tension failure mode phi = 0.9, to determine whether the plate can resist the lo When designing a weld connection for two plates, what types of should you consider and exam (name all possible failure modes?)

Explanation / Answer

5) 0.6 Fu represents  net section fracture strength on shear path

6) As per AISC J3.3 it should be 2.67*d =2.67*1.5 =4.005 in and preferrably not less than 3 d = 3 *1.5 = 4.5 in

4.5 in is the typically used spacing for 1.5 inch diameter bolt.

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