ALLOWABLE STRESS FOR TWO-HINGED STEEL ARCH

Abstract

An allowable stress formula for the conventional structural design is presented in this paper on the basis of the ultimate strength anaysis considered the finite deflection, the spread yeilded zones and the cooling residual stresses of arches as follows :
σ^1st_n/σ^1st_a+kσ^1stm/σ^1st_a≤ (F.S.)
σ^1st_a=σy/ (F.S.) 0.51+4n-10n²-0.1 (σk/2400^kg/cm2) -0.5×10^-5λ² (σk/2400^kg/cm2)
k=0.55+ (2400^kg/cm2/σy) /4
For the 2nd order elastic analysis, an allowable stress formula is also proposed in a simple form :
σ^2ndn+σ^2ndm≤0.9σy/(F.S.)