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Experimental Testing of Fillet Welded T-Joints to Evaluate the NZS3404 Specified Safety Factors for Seismic Fillet Welds

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Thesis(11.22 MB)

Date

2023

Authors

Zhang, Mark

Supervisor

Ramhormozian, Shahab

Item type

Thesis

Degree name

Master of Engineering

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Publisher

Auckland University of Technology

Abstract

Welding is widely used in the construction and manufacturing industry. The quality of the weld on-site and weld design become the most important factors for structural safety and cost-effectiveness. Mainly there are five basic weld categories which are butt weld, fillet weld, corner joint weld, lap joint weld, and edge joint weld. This research is focused on fillet weld which is one of the most widely used welding methods. In this project, five groups of fillet welding specimens with different weld sizes are experimentally tested in the lab. The data from the tests are collected and sanalyzed to obtain the safety factors for the simplified method formula currently used in New Zealand standard, NZS3404. These experimental safety factors from the test are compared to the existing factors recommended in NZS3404. The project is undertaken in three main steps: The first step is the test setup, specimens, and procedure design phase, which includes designing the test setup and different specimens as well as defining the testing procedure including the loading regime and measurement plan. This requires predicting the modes of failures of the specimens according to the provisions of the current standard. The second step is the experiments which include lab work and data collection. The specimens are under an axial cyclic loading regime. The welds are equal leg fillet weld. Using the equation ∅Vᵥᵥ=∅×0.6׃ᵤᵥᵥ×tₜ×kᵣ, which is a simplified method from NZS3404, the shear capacity of weld is identified. The recorded data such as load values from the actuator and the displacements are analyzed and compared with the current design methods. The third step consists of the analysis of the obtained data along with the recommendations.

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http://hdl.handle.net/10292/18353

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Masters Theses