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Article

Study on Hysteresis Model of Welding Material in Unstiffened Welded Joints of Steel Tubular Truss Structure

by 1, 1,* and 2
1
College of Civil and Hydraulic Engineering, Ningxia University, Yinchuan 750021, China
2
Institute of Architectural Engineering, Huangshan University, Huangshan 245021, China
*
Author to whom correspondence should be addressed.
Appl. Sci. 2018, 8(9), 1701; https://doi.org/10.3390/app8091701
Received: 27 August 2018 / Revised: 16 September 2018 / Accepted: 16 September 2018 / Published: 19 September 2018
(This article belongs to the Special Issue Emerging Construction Materials and Sustainable Infrastructure)
The weld form of intersecting joints in a steel tubular truss structure changes with the various intersecting curves. As the key role of joints in energy dissipation and seismic resistance, the weld is easy to damage, as a result the constitutive behavior of the weld is different from that of the base metal. In order to define the cumulative damage characteristic and study the constitutive behavior of welded metal with the influence of damage accumulation, low-cycle fatigue tests were carried out to evaluate overall response characteristics and to quantify variation of cyclic stress amplitude, unloading stiffness and energy dissipation capacity. The results show that the cyclic softening behavior of welding materials is apparent, however, the steel shows hardening behavior with the increase of cyclic cycles, while the cyclic stress amplitude, unloading stiffness, and energy dissipation capacity of the welding materials degenerate gradually. Based on the Ramberg–Osgood model and introducing the damage variable D, a hysteretic model of welding material with the effect of damage accumulation was established, including an initial loading curve, cyclic stress-strain curve, and hysteretic curve model. Further, the evolution equation of D was also built. The parameters reflecting the damage degradation were fitted by the test data, and the simulation results of the model were proved to be in good agreement with the test results. View Full-Text
Keywords: damage accumulation; unstiffened welded joints of steel tube truss; welding material; low-fatigue test; evolution equation of damage accumulation; hysteretic model; parameter fitting damage accumulation; unstiffened welded joints of steel tube truss; welding material; low-fatigue test; evolution equation of damage accumulation; hysteretic model; parameter fitting
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MDPI and ACS Style

Suo, Y.; Yang, W.; Chen, P. Study on Hysteresis Model of Welding Material in Unstiffened Welded Joints of Steel Tubular Truss Structure. Appl. Sci. 2018, 8, 1701. https://doi.org/10.3390/app8091701

AMA Style

Suo Y, Yang W, Chen P. Study on Hysteresis Model of Welding Material in Unstiffened Welded Joints of Steel Tubular Truss Structure. Applied Sciences. 2018; 8(9):1701. https://doi.org/10.3390/app8091701

Chicago/Turabian Style

Suo, Yaqi, Wenwei Yang, and Peng Chen. 2018. "Study on Hysteresis Model of Welding Material in Unstiffened Welded Joints of Steel Tubular Truss Structure" Applied Sciences 8, no. 9: 1701. https://doi.org/10.3390/app8091701

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