

_9mj 64 128 42(1F20)128(.)2, 647] 
—8 20\7.5.3“ 119.73 \ 9.7.5 (a) +7 
some numbers 09 n and q pre given in a table above. The corres- | 
ponding terms in (6) are very small and we can take approximately | 
n==0,02 ; p=0,02 
+ 
: 
pei. 
r 
Then 
W? C | : 
Be Nur 075 — 0,02 =) Do 
The second member in bracaets corresponds to the shearing. 
It gets some what greater, than in the solution of N. G. Filon men- 
tioned obove. 5 
The third member represents the effect of „local iregularitty“ 
on the deflexion of a beam. If we observe that the length on which | 
the „local irregularity“ is perceptibe, is of the order c and that the 
local stresses are of the same order as the stresses corresponding 
to the Saint-Venant’s solution, we can conclude at once na the 
corresponding additional deflection must be of the order 5 This | 
deflection certainly depens on the manner of the distribution of the 
load 2w over the cross-section, which is not taken in account in | 
our method of approximate solution. 
We will remark here also that the accuracy of approximate | 
solution can ce raised by the increasing of the number of members | 
in the exprassions (1) for stresses. | 
Upliv smicajućih naprezanja na progib. = 
Da se ocjeni ovaj upliv, primjenjuje se približna metoda na 
određenje progiba nosača uskog pravokutnog popriječnog presjeka. — 
Zadavši. izraze za naprezanja (1) tako, da bude udovoljeno uvje- | 
tima na površini (kod y== + <), odabiru se postojani koeficijenti | 
4,, a, tako, da je potencijalna energija savinutog štapa minimum. 
Ovim načinom dobiveni izraz za progibe (7) uključuje osim 
jd 
i 
članova reda koji odgovaraju stlačivajućim naprezanjima, još i 
m 
v c . r. . . .. Ve . . 5 
član reda 7 odgovarajući mjesnim naprezanjima u točki djelovanja | 
sagibajuće sile. S. Timoschenko. 
= Zagreb, Visoka tehnička škola. 

