Stud bolts and anchor bolts are not split round and threaded? The buried depths of bolts of different lengths are different. What is the tensile strength of the bolts of various types of concrete with various buried depths? The ultimate tensile capacity and allowable tensile capacity bolts are generally Q235 steel, which is round. It seems that I have not seen the use of threads, but it is not bad if it is required by force. Rebar has high strength, and it is not easy to make the thread of the nut.
For smooth round bolts, the buried depth is generally 25 times its diameter.
If the bolt diameter is very large and the depth of 45mm is too deep, the square plate can be welded to the end of the bolt, that is, a large head is enough, but there are certain requirements. The buried depth and the hook are to ensure the friction between the bolt and the foundation, so that the bolt will not be pulled out and damaged. Therefore, the tensile capacity of the bolt is the tensile capacity of the round steel itself, and the size is equal to the cross-sectional area multiplied by the tensile strength design value of 140 MPa, which is the allowable tensile bearing capacity during design.
The ultimate tensile strength is that the cross-sectional area should be the effective area of the thread at this time multiplied by the tensile strength of the steel. The tensile strength of Q235 is 235MPa. Because the design value is biased towards safety, the tensile force when designing the anchor bolt is less than the ultimate tensile force.
