Consideration of Gustafsson's proposed Eurocode 5 failure criterion for notched timber beams

1993 ◽  
Vol 20 (6) ◽  
pp. 1030-1036 ◽  
Author(s):  
Ian Smith ◽  
Gerret Springer
Keyword(s):  
Fracture Energy ◽  
Key Words ◽  
Failure Criterion ◽  
Structural Design ◽  
Complete Solution ◽  
Design Criterion ◽  
Design Codes ◽  
Beam Design ◽  
Theoretical Predictions ◽  
Timber Beams

Experimental results and theoretical predictions for failure of timber beams with end notches, or cuts on the tension face, are discussed. The validity of Gustafsson's formula and the underlying assumptions are examined in the context of structural design codes. Attention is drawn to the arbitrary dependence of theoretical predictions on the load and geometric arrangement of specimens, and the method by which fracture energy is estimated. It is not intended at this stage to give a complete solution for the problem, but it is concluded to be premature to incorporate the proposed Eurocode 5 failure criterion for notched beams into the Canadian Standard CAN/CSA 086.1. Key words: timber, fracture, notched beam, design criterion.

Bearing Strength Capacity of Continuous Supported Timber Beams: Unified Approach for Test Methods and Structural Design Codes

2012 ◽  
Vol 138 (2) ◽  
pp. 266-272 ◽  
Author(s):  
A. J. M. Leijten ◽  
S. Franke ◽  
P. Quenneville ◽  
R. Gupta
Keyword(s):  
Structural Design ◽  
Test Methods ◽  
Design Codes ◽  
Unified Approach ◽  
Bearing Strength ◽  
Strength Capacity ◽  
Timber Beams

Structural Design Codes of Australia and New Zealand: Seismic Actions

2013 ◽  
pp. 1-16 ◽  
Author(s):  
George P. Kouretzis ◽  
Mark J. Masia ◽  
Clive Allen
Keyword(s):  
New Zealand ◽  
Structural Design ◽  
Design Codes

Subcritical Crack Growth and Ship Structural Design

1976 ◽  
Vol 13 (02) ◽  
pp. 152-160
Author(s):  
Philip H. Francis ◽  
Philip H. Francis ◽  
James Lankford ◽  
Fred F. Lyle
Keyword(s):  
Crack Growth ◽  
Structural Design ◽  
Load Distribution ◽  
Subcritical Crack Growth ◽  
High Strength ◽  
Design Criterion ◽  
Low Alloy Steels ◽  
Initiation And Propagation ◽  
Alloy Steels ◽  
Environmental Attack

A review is made of the factors which influence subcritical crack growth in conventional and high-strength, low-alloy steels of the type used in primary and secondary welded ship structures. The types of influencing factors considered are the metallurgical parameters, the fracture mechanics of the crack tip processes, the loading state, and the mechanisms of environmental attack. The fatigue process is separated into the crack initiation and (subcritical) crack propagation stages, and the relative influence of the above factors is discussed for each of these stages. Following this review, a basis for a design criterion is established for safe-life design of welded cargo ship structure. Two specific criteria are advanced: one which utilizes only the endurance strengths of the weldment types employed for constant-amplitude cyclic loading, and the other which sums the initiation and propagation lives each as governed by a spectral load distribution. These two criteria are compared, and existing gaps which need to be closed to elevate the confidence in the criteria are pointed out.

Failure Surface Variation Obtained with the Truss-Like Discrete Element Method

2015 ◽  
Vol 784 ◽  
pp. 225-232
Author(s):  
Guilherme Schumacher da Silva ◽  
Fabrício Goulart Fernandes ◽  
Angélica Bordin Colpo ◽  
Vicente B. Puglia ◽  
Luis E. Kosteski
Keyword(s):  
Spatial Distribution ◽  
Discrete Element Method ◽  
Fracture Energy ◽  
Failure Criterion ◽  
Failure Surface ◽  
Discrete Element ◽  
Constitutive Law ◽  
Surface Variation ◽  
Spatial Lattice ◽  
Element Method

This paper presents the study of failure surface obtained in the truss-like Discrete Element Method (DEM). The element constitutive law considers the fracture energy of the material and its spatial variation is used to take into account the heterogeneity of the simulated materials. It is studied the influence of spatial distribution of fracture energy and the spatial lattice perturbation on the DEM failure surface. A DEM failure criterion is compared with concrete and rock failure.

Structural design for compression strength perpendicular to the grain of timber beams

2010 ◽  
Vol 24 (3) ◽  
pp. 252-257 ◽  
Author(s):  
A.J.M. Leijten ◽  
H.J. Larsen ◽  
T.A.C.M. Van der Put
Keyword(s):  
Compression Strength ◽  
Structural Design ◽  
Timber Beams

scholarly journals Floor vibrations from aerobics

1990 ◽  
Vol 17 (5) ◽  
pp. 771-787 ◽  
Author(s):  
D. E. Allen
Keyword(s):  
Key Words ◽  
Structural Design ◽  
Building Code ◽  
Design Criteria ◽  
Recent Experience ◽  
Loading Function ◽  
Floor Vibrations ◽  
Floor Vibration ◽  
Vibration Problems ◽  
First Time

Recent vibration problems with floors used for aerobics have shown the need for better guidelines for structural design and evaluation. Such guidelines were introduced for the first time in the Supplement to the 1985 National Building Code (NBC), but more recent experience with one particular floor has shown the need for some improvements to these guidelines. The paper describes the investigation of the floor and the use of the floor to estimate the loading function for aerobics, and recommends changes to the NBC design criteria. The paper provides guidance on estimating parameters used in the criteria and discusses repair alternatives related to the floor problem. Key words: floor vibration, aerobics, design criteria, repair.

Reliability analysis for critical reaction forces of lumber members with an end notch

1996 ◽  
Vol 23 (1) ◽  
pp. 202-210 ◽  
Author(s):  
Ian Smith ◽  
Ying Hei Chui ◽  
Lin Juan Hu
Keyword(s):  
Structural Reliability ◽  
Reaction Force ◽  
Service Condition ◽  
Design Criterion ◽  
Timber Species ◽  
Limit States ◽  
Beam Design ◽  
Design Variables ◽  
Property Data ◽  
Reaction Forces

The basis of new design provisions for avoidance of brittle failures in sawn lumber members with an end notch is explained. Linear elastic fracture mechanics and structural reliability concepts are combined with material property data to determine appropriate forms of equations for limiting the reaction force, when a notch is made on either the tension or compression face of a member. Following from this, the factored reaction force resistance of a member designed to the 1994 edition of the CSA Standard 086.1 "Engineering design in wood (limit states design)" depends upon the depth of the member and the geometry and size of an end notch if the notch is located on the tension face. A new property, the specified reaction force strength, which is a measure of the capability of the material to resist fracture, is taken to be independent of the timber species and stress grade of the lumber. Design variables such as duration of load and moisture service condition influence assignments of factored reaction force resistances for members end notched on the tension face. When a notch is located on the compression face of a member the resistance is simply the factored shear resistance of the residual cross section. As in previous editions of CSA Standard 086.1, notches are not permitted to have a depth greater than 0.25 times the depth of the section. Key words: lumber, fracture, structural reliability, notched beam, design criterion.

Structural Integrity Demonstration of High Burnup Fuel Rod

2006 ◽  
Author(s):  
Tong Liu ◽  
Danrong Song ◽  
Hua Zhao ◽  
Kaiming Wang
Keyword(s):  
Structural Integrity ◽  
Design Criterion ◽  
Current Status ◽  
Design Codes ◽  
Fuel Rod ◽  
Fuel Models ◽  
High Burnup ◽  
Near Future

This paper introduces the current status and the work has been done for structural integrity demonstration of high burnup fuel in China. The FRAMATOME ANP COCCINEL, FLAMBE and MISTIGRI design codes are used in the structural integrity demonstration of fuel rod. This paper presents the results of structural integrity demonstration of AFA3G fuel rod in GNPS. All the design criterion are met. Based on CAFA program, the new fuel models are planning to be developed in the near future.

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