— 140 — 
that of the plate or web re-entorced ; the product will be the moment of the stress upon 
the re-enforcing plate. Divide this moment by the working bending-moment, taken 
from Table XVIII, for a rivet of the diameter to be employed for the connection : 
the quotient will be the number of rivets required to resist bending. Next find, 
from tbo same table, the working bearing-stress for one of the rivets upon a 
plate of the thickness of the re-enforced plate or web, and divide it into tlie stress which 
the latter carries : tlie quotient will be the number of rivets required to afford sufficient 
bearing. The greater of the two numbers thus obtained is tlie one to be employed. 
Next make to scale a drawing of the rc- enforcing plate, laying out the rivets, if it be 
possible, symmetrically, and thus determine the length of the re-enforcing plate. 
In case of a re-enforced pin 1101 e, if the diameter of the hole exceed one-lialf the 
width of the plate, it will be necessary to put more rivets in front of the pin hole 
than behind it ; the ratio of the number in front to the whole number being equal to 
that of the diameter of the hole to the width of the plate. 
The method of proportioning splice plates or connecting plates is somewhat 
similar. For instance, let us take tho plates at a joint in the top chord ; which 
joint, for reasons stated in Chapter IV, is always to bo placed a few inches to that 
side of the pin 11010 farthest from the middle of the span. The stress on tho por- 
tion of tho plates to this side of the joint is that due to the stress in tho panel where 
tlie joint occurs ； while that on tlie other portion of the plates is due to the stress 
in the next panel towards the middle of span. The number of rivets on each side 
of the joint will be dependent upon tlio stresses carried by the channel bars of the 
two adjacent panels, which stresses are most readily determined by multiplying the 
area of the cliannols by the intensity of working stress given in Table VIII, and by 
which they were proportioned. The stress on each channel is to be divided equally 
or otherwise between tlie two connecting plates, and the number of rivets on each 
side of the joint is to bo determined in the same manner as for rc-enforcing plates. 
To determine tho length of tho cover plate, find in the same manner the 
number of rivets upon each side of the joint, which will take up the stress carried by 
the chord plate, which stress is to be found by multiplying the area of the section of 
the top plate by the same intensity as in the last case. 
At tlie liip . 1 0111 1 tli g section ot the connecting plates must answei* two re^iiire- 
rueiits; fiisf, theii iiio’x (neglecting， on account of its being bent, tlio effect of tliG covgi* 
plate) must be sufficient to transfer to the chord a stress equal to that in the first 
panel ; and second, that the pin bearing be sufficient for the resultant of the tensions 
in the diagonals and verticals meeting at the hip. The length of the cover plate at 
the hip cannot be calculated, for it carries no stress, simply adding to the rigidity of 
tlie joint, and keeping the rain therefrom. 
The area of the greatest section of the connecting plate at one side of the shoe 
made by a plane perpendicular to the direction .of the batter brace should be equal 
to tliG circfi of ohg bfiltcv brtico clitiniicl, or greater if tlie slioo pin require grcfitcr 
bearing than this would afford ； and there should be enough rivets to transfer the 
stress from the Latter brace channel to the connecting channel or plate. Should 
the batter-bracc channels bear against the shoe plates, as they ought to do, there 
