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# Structural Steel Design - Essay Example

## Extract of sample Structural Steel Design

It is important to understand that the failure of bolt is the characteristics of the minimum residual stresses of the bolt material. During an exercise, consistent stresses were derived for ordinary black, and turned and fitted bolts upon their respective failure. As per Peter (1950) experimentation, "the yield point of thread, however in the case of the black bolts was approximately 30 percent, which is lower than yield point obtained for turned and fitted bolts". It is important to specify that in all the failures the damage initiated from the root of the thread, however there were instances when the threads stripped.
It has been experimental proven by Peter (1950) that the "strength of a bolt in direct tension is greatly affected by the amount of initial tension induced when the nuts were made spanner tight; this is a factor which is uncontrollable from design perspective. The strength is dependent upon resistance of the threads against stripping". It is practically concluded that, "most of the stress on the threads will be shear as the tendency in screwing up will be to force the threads off the bolt or nut in a direction parallel to the axis i.e. circumferential due to the friction between the adjacent threads". Peter (1950) has noted that "when considering the allowable unit stress which may safely be adopted the probability that some of the stock bolts may be wrought iron, instead of mild steel" must not be ignored.
The bolts which assist in the hanging of the runways are exposed to direct tension. It is therefore recommended that conservative approach shall be adopted, with specific reference to the determination of the safe loads for these bolts.
Types of Bolts
Black Bolts
We shall start with experiment, considering " diameter bolt having shank of ", "it is practically impossible to roll black bars exactly to the nominal diameter it follows that there exists an allowance in the size of the shank of the finished bolt, which is usually allowance of 1/32" over the nominal diameter. It is known that the nominal diameter of the bolt is greater than tops of threads, "this amount varies in some vases it will be about 1/64", but good bolt makers work to be very much slower figure. ...Show more

## Summary

The strength of the bolt which is subjected to direct tension is unexpected. This tension is function of amount of initial tension which is induced during tightening down the nuts by hand with common tools.
It is important to note that when the nuts are simply screwed by hand, without excessive tightening through tools, "the stresses at the yield point of thread, based on area at bottom of thread, were fairly consistent"…
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