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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2. New results from experimental studies on the stress-strain state of all arch components – half-arches, ties, and struts – were obtained. These experiments involved the application of symmetric and asymmetric loads in the form of concentrated forces uniformly distributed along the length of the top chord of the arch. 3. The investigation revealed that the experimental normal stresses deviated by up to 20% from the theoretical values, calculated based on the deformation scheme, in the characteristic cross-sections of the arch half-chord with a spacer, while still maintaining a safety margin. The experimental deflections remained within the allowable limits, not exceeding 1/200 of the span, i.e., 4.5 cm . 4. The results of the conducted experimental studies on the arch with a perforated top chord confirmed the main theoretical prerequisites for its calculation, proposed by the authors during the development of a complex methodology for calculating such structures. 5. The objective is defined for further experimental and theoretical research of non-separated perforated elements and the establishment of effective structural solutions for intermediate supports. This depends on various factors such as size, nature of action (static or dynamic), type of load (concentrated, evenly distributed, combined), load application scheme, material strength (standard or high-strength steels), span size, and geometric parameters of the section. These parameters vary based on the presence or absence of stiffeners along the axis of the intermediate support, as well as the presence of welded or non-welded perforation holes on the left and right of the support. 6. Preliminary calculations of the beam model using the finite element method in the “Lira” software complex were performed. The outcomes revealed a distinctive stress distribution at the calculation points of characteristic cross-sections with holes in the support part of a continuous perforated beam near the intermediate support. This distribution significantly differs from the stress pattern in the span part, as the sign of the bending moment curve changes from positive in the span to negative at the support. This completely changes the nature of the stress-strain state, underscoring the need for further experimental and theoretical studies on various types of supporting parts of beams in order to develop a comprehensive methodology for their calculation and provide recommendations for determining the rational area of application for each type. References Eurocode 3, 2005: Design of steel structures. EN 1993-1-8:2005. Roman і uk, V., Supruniuk, V., 2013. Mitsnistʹ ta deformatyvnistʹ perforovanykh elementiv stalevoyi arky (Strength and deformability of perforated elements of steel arch). Rivne. NUWM. 106 p. (In Ukrainian) Roman і uk, V.V., et al., 2017. Nesucha zdatnistʹ perforovanykh prohoniv Z -podibnoho profilyu za kosoho zhynu (Carrying capacity of perforated runs of Z-shaped profile in oblique bending). Rivne. NUWM. 206 p. (In Ukrainian) DBN V.2.6 – 198: 2014, 2014. Stalevi konstruktsiyi (Steel structures). Normy proektuvannya. Kyiv. Minrehion Ukrayiny. 198 p. (In Ukrainian) Chung K.F. et al., 2003. Steel beams with large web openings of various shapes and sizes: an empirical design method using a generalized moment-shear interaction, Journal of Constructional Steel Research 59, 117-1200. Tsavdaridis, K.D., D’Mello , C., 2011a. Vierendeel Bending Study of Perforated Steel Beams with Various Novel Shapes of Web Openings, through Non- linear Finite Element Analyses”, ASCE Journal of Structural Enginee ring 138 (10), 1214 – 1230. Tsavdaridis, K.D., D’Mello , C., 2011b. Web Buckling Study of the Behaviour and Strength of Perforated Steel Beams with Different Novel Web Opening Shapes”, The Journal of Constructional Steel Research 67 (10), 1605-1620. Samadhan, G. Morkhade, Laxmikant M. Gupta, 2015. An experimental and parametric study on steel beams with web openings.International Journal of Advanced Structural Engineering 7, 249-260.