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Experimental Research of Z-direction Properties on Thick Plate Structural Steel and Its Weld Connections

Author: ZhangYuanYuan
Tutor: WangYuanQing
School: Tsinghua University
Course: Civil Engineering
Keywords: thick plate steel Z-directon properties crossing joint butt weld design method
CLC: TU391
Type: Master's thesis
Year: 2013
Downloads: 9
Quote: 0
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Abstract


With extensive requirement of structural steel projects, thick platestructural steel is much more popular and widely applied in high-rise buildings,long-span structures, bridges, offshore platform, pressure vessels and hulls ofships. Along with the increase of the plate thickness, the augment of the weldsize, the complexity of the loads and the harmful effects of constrains, structuralsteel will be destructed by lamellar tearing and other Z-direction destructions.Additional, in cold areas the sensivity structural steel destructed by Z-directioncan be much more aggreviated by low temperature. In this paper, fracturetoughness of some typical cracks in thick plate structural steel are analyzed byfinite element models; experiments are finished to search the Z-directionproperties of Thick plate structural steel and its joints; at last the methods ofstructure design and the selection of material for avoiding Z-direction failuresare proposed. The main achievements are as follows:(1) Cracks in thick plate and its joint are analyzed by finite element models. Thedistance of accrete cracks, the thickness of plate, etc. are considered, and the changinglaws of K, J are analyzed, which can provide advices for future analysis.(2) Simple tensile test samples are extracted from plate steel of60~165mm Q345Bby base metal, crossing joint and butt weld. The directions of sampling are rollingdirection(X) and thickness direction (Z), and test temperature is-60~20℃. Theprinciples how yield&ultimate strength and reduction of area change with platethickness, weld size, sampling method and temperature are obtained.(3) Sharpy impact test samples are extracted from plate steel of60~165mm Q345Bby base metal, crossing joint and butt weld. The directions of sampling are rollingdirection(X) and thickness direction (Z), and the test temperature is-60~20℃. Theprinciple how impact energy changes with plate thickness, weld size, sampling methodand temperature is obtained.(4) Three point bending test samples are extracted from plate steel of60~165mmQ345B by base metal, crossing joint and butt weld. The directions of sampling arerolling direction(X) and thickness direction (Z), and the temperature is-60~20℃. The principle how fracture toughness CTOD changes with plate thickness, weld size,sampling method and temperature is obtained.(5) Based on the results of experiments, according to the existed standards forevaluation criterion on sensitivity of Z-direction properties, evaluation method on thebasis of tensile properties are complemented, evaluation method on the basis ofimpact&fracture toughness are added. The effect of temperature is considered, and thesuggestions giving different parameters for different plate thickness are proposed.

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CLC: > Industrial Technology > Building Science > Building structure > Metal structures > Steel
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