BEAM BRIDGES. 



117 



^V37W> 5tft>, Bottom I'Attnr tq> of Jo/sis 

 ~ '~y/ ters - It'c-toc- 



Wirf 

 Rflnferffmtnt in 



tf'c-toc 



Hor. 5-j: fi'rs- not thru HALF INT- SfCWti 



HALF SECTION AT ABUTMEHT 



Note: Out SK*> Is to it \ 

 raised // * stew Art^e 



with mesh 



r.lj. DATA FOB STAHMRD BCAN SPANS -pwctfTf FLXR 



Hole:- Add or subtract ont I for axh 2ft. 

 chanqt of 



For hsndrjil oner m'rtfs jdd 1.9 yd's. con- 

 crete jnd . ISO lo- rsin forcing ptr bridqt . 



STANDARD BEAM 5PM15 



Concrete Floor Hdnt/r<?il 

 IOWA HIGHWAY Co/mission 



FIG. 13. BEAM BRIDGES. 



The minimum sizes of I-beams for different loadings and for different spacings and spans and 

 with a concrete and a plank floor have been calculated by the author and are given in Table XI 

 and Table XII. 



Floor planks may be spiked to spiking strips on the tops of the beams, or to spiking strips 

 bolted on the sides of the I-beams. The floor planks are spiked to these spiking strips, and are 

 fastened to the other beams by clinching spikes, which have been driven through the planks, 

 around the top flanges of the beams. 





