Failure Pressure of Welded Hollow Spherical Joints Containing Grooving Corrosion Defects and Wall Reduction
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International Journal of Steel Structures https://doi.org/10.1007/s13296-020-00414-5
Failure Pressure of Welded Hollow Spherical Joints Containing Grooving Corrosion Defects and Wall Reduction Huiyun Chen2 · Hongbo Liu1,2 · Zhihua Chen1,2 Received: 5 June 2019 / Accepted: 21 September 2020 © Korean Society of Steel Construction 2020
Abstract Welded hollow spherical joints (WHSJ) have been widely used in various space structures. Corrosion of WHSJ is inevitable and will eventually threaten the structural safety. This paper makes an assessment of the accuracy of quality inspection procedures commonly employed by spatial grid structure to calculate the failure pressure of corroded WHSJ via finite element analyses (FEA). Second, this paper studies the influence of the corrosion depth, corrosion pattern, groove height, joint size and other parameters on the bearing capacity of WHSJ also via FEA. Analytical procedures to calculate the failure pressure associated grooving corrosion are not available yet. Thus, based on the parametric analysis results, such a procedure is devised and proposed here. Results indicated that the wall thickness loss and the diameter ratio were the main factors affecting the ultimate compressive performances of WHSJ; the volume loss of WHSJ outside the "critical latitude of groove" had nothing to do with the compressive performances; the influence of corrosion on the ultimate compressive performances was independent of the diameter and thickness of WHSJ. The derived result would lay a foundation for the prediction and evaluation of the residual bearing capacity of space grid structures with WHSJ. Keywords Space grid structure · Welded hollow sphere joints · Corrosion · Grooving corrosion · Ultimate compressive performances · Numerical simulation
1 Introduction Space grid structure has been widely used in swimming pool, gymnasium, workshop, expo hall and other large span buildings. As a typical joint of spatial grid structure, the welded hollow spherical joint (WHSJ) (Liu 2000) was proposed by professor liu xilang of Tianjin university in 1965 and used in the auditorium project of Tianjin science palace. Now it has become one of the most widely used joints in China. There are various forms of WHSJ, which can be divided into different types according to the sectional form of connecting bars. The most common type in engineering is WHSJ with circular steel tubes, as shown in Fig. 1. At present, the research on WHSJ mainly focused on the mechanical properties of joints without corrosion. Especially * Hongbo Liu [email protected] 1
State Key Laboratory of Hydraulic Engineering Simulation and Safety, Tianjin University, Tianjin 300072, China
Department of Civil Engineering, Tianjin University, Tianjin 300072, China
2
for WHSJ with circular steel tubes, a relatively perfect analytical design method had been established (JGJ7-2010 2010) (JG/T 11-2009 2009). Han et al. (2003, 2016; Han and Liu 2004) studied the ultimate tensile and compressive capacity of welded spherical joints and the influ
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