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PhD Proposal_PK

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PKM MONIRUZZAMAN

on 26 November 2016

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Transcript of PhD Proposal_PK

Expt
R. Ques
Stability Behaviour of Cross Laminated Timber (CLT ) Walls Subjected to In-plane Gravity Loading


PhD Committee Meeting


PKM Moniruzzaman

Sept 2013- present
Thank you

Q?
Short Column
Intermediate Column
2.2
1.2
2.7
Strength and Stiffness
CLT Design

CLT Handbook approach
Effective slenderness ratio
Gamma Method
k – Method
Shear Analogy Method
Only layers parallel to load direction carrying the load
Assumption
CLT Design Approach and Test Results
Research Questions
Q1: Code assumption
What extent of neglecting the cross layers contributions is valid up to?

Q2: Cross-layers contributions
How shear deformation and rolling shear modulus can control the stability behaviour?

Q3: Number of CLT layers
What would be the size and stress distribution eects on the CLT wall stability?

Q4: Nonlinearity and uncertainty
How to incorporate large deformations and randomness associated with members and loads?
Approaches
Experimental
Numerical
Reliability
Non-linear Analysis
Compatibility
Section Analysis
Equilibrium and Force-Deformation
Equilibrium-weak form
Outputs
DOFs- failure modes, failure loads, stress distribution, cracks pattern
Check: Tolerance [Newton-Raphson]
Numerical Analysis
Random Variables
Compressive strength
Modulus of elasticity (MOE)
Moisture content
End fixation
Initial lateral deflection of column
Load eccentricity
Full Factorial Design
3^6= 729
Randomly select 100 sample |
D- Optimal deterministic experimental design
Use numerical analysis
Response Function
Interaction: ANOVA
Evaluate: Actual and predicted value
Performance Function
Limit-state function: R-S
Reliability Index
FORM
SORM
Importance sampling
Reliability analysis
CLT system
CLT Walls Stability
Short columns
Compressive strength || to grain

Long columns
MOE

Intermediate columns
Strength and stiffness
Related Study
Dominik Horvat
Visiting student, UBC (2013)
Sought out distribution from the Experimental study
A 5-layers CLT column strip having two different configurations, namely, weak and strong resistance, will be testing to examine the different cross-section layups influence on the stability behaviour.
Conclusions
S=Fisher-Tippett extreme value distributions

Stress volume inclusion
Evaluate short column behaviour and predict its short term strength to include the contribution of the cross plies with consideration of the glue and gap.
Measure the effects of material and construction uncertainty on the CLT stability behaviour under a random load.
Experimental Study
Proposed Test Matrix
Expected Results
Develop the CLT wall system test data subjected to in-plane gravity loading for the purpose of numerical model validation.
Displacement interpolation: Strong form
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Displacement Formulation
Force Formulation
The results approach the true solution as the number of elements increases.
More computationally efficient, but at the cost of lower accuracy.
The accuracy is significantly improved by increasing the number of integration points.
The numerical study will be employed to examine the impact of cross-layers effects on the CLT wall stability considering parameters, such as, number of layers and gap.

Finally the reliability analysis will be accomplished with consideration of the sources of uncertainty lie upon the production, construction, material and loading conditions.
Overview
Reliability
Conclusion
Supervisory Committee:
Professor Dr. Frank Lam
Professor Dr. Terje Haukaas
Professor Emeritus Dr. Ricardo O. Foschi
26 March 2015
Numerical
Orthotropic behaviour
P-Delta effect
Sample number <-- Operating characteristic curve
A
x ~ D
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Full transcript