68 REINFORCED CONCRETE CONSTRUCTION 



and second cases maximum shear occurs where maximum mo- 

 ment exists, while in the latter case it occurs at the point of zero 

 moment. Conditions are thus seen to be somewhat more favor- 

 able in the continuously loaded beam. 



The next question to be decided is this: How may we prevent 

 diagonal tensile stresses which are excessive? Obviously, they 

 will be reduced by keeping the horizontal tension small through 

 the use of considerable horizontal steel at points of heavy shear, 

 by avoiding heavy shearing stresses, and by providing some type 







FIG. 33. 



of web reinforcement. The different methods of reinforcing for 

 diagonal tension failure will now be taken up. From the pre- 

 ceding discussion it is sufficient to bear in mind that the shear 

 is the principal factor to be considered in the matter of diagonal 

 tension and is a convenient measure of such stress. Also, that 

 the shearing strength of the steel cannot be considered to aid the 

 strength of a beam with respect to diagonal tension. 



37. Methods of Web Reinforcement. There are in use many 

 methods of placing steel in the web of a reinforced concrete 

 beam in order to reinforce it against diagonal tension failure. 

 The various methods may, for convenience, be divided into three 



