Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Mechanical performance of welded hollow spherical joints with H-beams after elevated temperatures
Highlights Axial compression properties of H-WHSJ after elevated temperatures were studied. Effects of residual deformation on the mechanical properties of H-WHSJ after elevated temperatures were discussed. Finite element models of H-WHSJ were established and verified. Formula to calculate the residual bearing capacity of H-WHSJ after elevated temperatures was proposed.
Abstract Welded hollow spherical joints with H-beam (H-WHSJ), as a new connection pattern in space lattice structures, have been applied in practical engineering. This study aims to investigate the residual mechanical properties of H-WHSJ after loading in elevated-temperature environments and provide an important basis to evaluate the performance of space lattice structures after the occurrence of fire. The effects of temperature history, plastic residual deformation, sizes of WHSJ and H-beam, type of steel, and stiffening rib arrangement on the residual mechanical performance of H-WHSJs after exposure to elevated temperatures are determined via axial compression test by using 28 specimens and finite element (FE) parametric study. The major conclusions are as follows. (1) The residual characteristics of H-WHSJ after elevated temperature are rarely affected by temperature history, but mainly determined by the residual deformation at elevated temperature when the temperature is lower than 700 °C. (2) Plastic residual deformation can considerably reduce the residual bearing capacity (N u,p) of the loaded H-WHSJ. In particular, N u,p decreases by approximately 20% when the residual deformation is 6% of the hollow sphere diameter. (3) The formula to calculate the residual bearing capacity of H-WHSJ after loading in elevated-temperature environments has been proposed, and its prediction are in good agreement with the test and FE results.
Mechanical performance of welded hollow spherical joints with H-beams after elevated temperatures
Highlights Axial compression properties of H-WHSJ after elevated temperatures were studied. Effects of residual deformation on the mechanical properties of H-WHSJ after elevated temperatures were discussed. Finite element models of H-WHSJ were established and verified. Formula to calculate the residual bearing capacity of H-WHSJ after elevated temperatures was proposed.
Abstract Welded hollow spherical joints with H-beam (H-WHSJ), as a new connection pattern in space lattice structures, have been applied in practical engineering. This study aims to investigate the residual mechanical properties of H-WHSJ after loading in elevated-temperature environments and provide an important basis to evaluate the performance of space lattice structures after the occurrence of fire. The effects of temperature history, plastic residual deformation, sizes of WHSJ and H-beam, type of steel, and stiffening rib arrangement on the residual mechanical performance of H-WHSJs after exposure to elevated temperatures are determined via axial compression test by using 28 specimens and finite element (FE) parametric study. The major conclusions are as follows. (1) The residual characteristics of H-WHSJ after elevated temperature are rarely affected by temperature history, but mainly determined by the residual deformation at elevated temperature when the temperature is lower than 700 °C. (2) Plastic residual deformation can considerably reduce the residual bearing capacity (N u,p) of the loaded H-WHSJ. In particular, N u,p decreases by approximately 20% when the residual deformation is 6% of the hollow sphere diameter. (3) The formula to calculate the residual bearing capacity of H-WHSJ after loading in elevated-temperature environments has been proposed, and its prediction are in good agreement with the test and FE results.
Mechanical performance of welded hollow spherical joints with H-beams after elevated temperatures
Liu, Hongbo (Autor:in) / Zhang, YingJie (Autor:in) / Wang, Lan (Autor:in) / Zhao, Yu (Autor:in) / Chen, ZhiHua (Autor:in)
Engineering Structures ; 222
06.07.2020
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
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