PSI - Issue 59

Volodymyr Romaniuk et al. / Procedia Structural Integrity 59 (2024) 479–486 Volodymyr Romanіuk et al. / Structural Integrity Procedia 00 (2019) 000 – 000

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The stress state analysis of the perforated compression-bending chord of the arch was carried out by comparing the theoretical and experimental stresses in its 28 sections (14 for each half-arch) over the entire span (see Fig. 1). The theoretical stresses were calculated according to a refined method that uses the theory of bending and assumes that the stresses are determined as in a conventional beam weakened by holes, considering the additional bending of the chord caused by the transverse force. Experimental stresses were measured using strain gauges connected to strain gauge equipment. 3. Research results Fig. 2 shows the theoretical and experimental stress values in the upper and lower flanges of the perforated half girders of the arch with a spacer under a symmetrical load application scheme.

a

b Designations:

the stress curve in the upper flange without pre tensioning the spacer, if the eccentricity of the tie displacement ; the same, if the stress curve in the upper flange with pre-tensioning of the spacer, if the eccentricity of the tie displacement ; the same, taking into account the external load q ; ; the same, if the same, if ; ;

the stress curve in the lower flange without pre tensioning the spacer, if the eccentricity of the tie displacement ; the same, if the stress curve in the lower flange with pre-tensioning the spacer, if the eccentricity of the tie displacement ; the same, taking into account the external load q ; the same, if the same, if ; ;

Fig. 2. Stresses in the upper and lower flanges of the semi-arch chordin characteristic cross-sections under a symmetrical arch load scheme with a spacer: a – theoretical; b – experimental.