12 STANDARD SPECIFICATIONS 



44. Pin Holes. Pin holes shall be reinforced by plates where 

 necessary. The plates shall be of such size as to distribute 

 properly, through sufficient rivets, the pin pressure to the webs 

 and their flanges in each segment of the main member. 



45. Wall Plates and Column Bases. The minimum thick- 

 ness shall be in. for wall plates and f in. for base plates. The 

 wall plates and column bases shall be detailed and placed in such 

 a manner that the load will be evenly distributed, using cement 

 mortar or grout for filling if necessary. 



They shall be of sufficient size and thickness so as not to 

 exceed the allowable unit stresses. (Pars. 12, 14, 17, 18 and 19.) 



46. Anchor Bolts. Columns shall be anchored to the foun- 

 dations, by means of anchor bolts, when stressed in tension at 

 their base. The minimum diameter of anchor bolts shall be 

 in. upset; they shall be of sufficient length to engage a mass 

 of masonry, the weight of which shall be 1J times the tension. 



The anchor bolts shall in all cases be of sufficient size to 

 resist in shear any horizontal force acting thereon. 



47. Temperature. Where necessary provision shall be made 

 for expansion and contraction covering a range of 150 F 



48. Expansion Rollers. The minimum diameter of expan- 

 sion rollers shall be 4 in. 



