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PhD Final test - 21.07.2013

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by

Omar Kandil

on 25 September 2013

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Transcript of PhD Final test - 21.07.2013

Analysis of RC sections
Material modeling
Nonlinear Analysis of Reinforced Concrete Structures Considering Soil-structure Interaction
Nonlinear Analysis of Arched Structure
Modeling
Introduction
Verification of the Model
Nonlinear Analysis of Framed Structures
Supervised by

Prof. Mohamed Mossad El Gendy
Dr. Ibrahim Ahmed El-Arabi
Dr. Rafeek W. Abdel-Missih

Approved by

Prof. Mostafa Kamel Zidan
Prof. Hassan Mohamed Hassan
Prof. Mohamed Mossad El Gendy
Dr. Ibrahim Ahmed El-Arabi

NARC II Program
Differential Settlement for Multi-Bay Multi-Story Structures
Conclusions
Classical methods of structural analysis
Linear material
Perfect supports
P - delta effect is neglected
Present Analysis (NARC II)
Material nonlinearity
Geometric nonlinearity
Soil-structure interaction
Linear continuum model
Nonlinear continuum model
Nonlinear Winkler's model
Linear Winkler's model
1. Comparison with experimental and theoretical
simply supported beam test
Verification of the model
Nonlinear Analysis of Reinforced Concrete Structures Considering Soil-structure Interaction
A THESIS
Submitted in Partial Fulfillment for the Requirements of the Degree of Doctor of Philosophy in Civil Engineering

Omar Anwar Abd El-Raouf Kandil

2. Simply supported beams resting on an elastic foundation
Verification of the model
3. A single-bay two-story frame
Verification of the model
4. Column test with axial and eccentric loads
Verification of the model
5. Two reinforced concrete arch ribs
Verification of the model
6. Underground tunnel resting on an elastic foundation
Verification of the model
7. Plane frame resting on an elastic foundation
Verification of the model
8. Double filed framework resting on an elastic foundation
Verification of the model
10. Multi-bay multi-story frame resting on an elastic foundation
Verification of the model
9. Multi-bay two-story frame resting on an elastic foundation
Verification of the model
Properties of analyzed frame
Nonlinear Analysis of Framed Structures
Deformed shape at ultimate load
Nonlinear Analysis of Framed Structures
Ultimate load for different cases
Nonlinear Analysis of Framed Structures
Load versus drift for different cases
Nonlinear Analysis of Framed Structures
Linear and nonlinear Winkler's model
Linear and nonlinear continuum model
Load versus settlement for different cases
Nonlinear Analysis of Framed Structures
Settlement at mid span
Settlement at right column
Load versus bending moment for different cases
Nonlinear Analysis of Framed Structures
Bending moment at mid span
Bending moment at bottom section of right column
Introduction
Nonlinear Analysis of Arched Structure
1. Effect of arch span to rise ratio (L/f)
Nonlinear Analysis of Arched Structure
1. Effect of arch span to rise ratio (L/f)
Interaction diagrams
Nonlinear Analysis of Arched Structure
Group A
Group B
2. Optimum tie reinforcement
Nonlinear Analysis of Arched Structure
2. Optimum tie reinforcement
Nonlinear Analysis of Arched Structure
Tie elongation
Maximum vertical deflection
3. Effect of the bending stiffness of arched girder and column
Nonlinear Analysis of Arched Structure
4. Effect of the column inclination
Nonlinear Analysis of Arched Structure
4. Effect of the column inclination
Nonlinear Analysis of Arched Structure
Group A
Group B
5. Effect of the type of foundation soil (soil-structure interaction)
Nonlinear Analysis of Arched Structure
5. Effect of the type of foundation soil (soil-structure interaction)
Nonlinear Analysis of Arched Structure
Winkler's model
Continuum model
5. Effect of the type of foundation soil (soil-structure interaction)
Nonlinear Analysis of Arched Structure
Arch girder
Column section
6. Geometrical shape of arch girder
Nonlinear Analysis of Arched Structure
6. Geometrical shape of arch girder
Nonlinear Analysis of Arched Structure
Arch girder
Column section
Geometrical shapes
Ultimate capacity
Introduction
Differential Settlement for
Multi-Bay Multi-Story Structures
Diagonal cracking of masonry walls and some repair methods
Properties of multi-bay multi-story frame
Differential Settlement for
Multi-Bay Multi-Story Structures
Analyzed frame
Soil properties of Port-Said (old city)
Differential Settlement for
Multi-Bay Multi-Story Structures
Soil profile
Soil model according NARC II program
32 Study cases of four-bay twelve-story frames
Differential Settlement for
Multi-Bay Multi-Story Structures
Analysis of unbraced frame
Differential Settlement for
Multi-Bay Multi-Story Structures
Analysis of unbraced frame
Lateral drift
Differential Settlement for
Multi-Bay Multi-Story Structures
Analysis of unbraced frame
Bending moment
of column base
Differential Settlement for
Multi-Bay Multi-Story Structures
Analysis of unbraced frame
Axial forces at foundation
Differential Settlement for
Multi-Bay Multi-Story Structures
Analysis of unbraced frame
Bending moment
of ground floor beams
Differential Settlement for
Multi-Bay Multi-Story Structures
Analysis of braced frame
Differential Settlement for
Multi-Bay Multi-Story Structures
Analysis of braced frame
Effect of bracing system to control the
differential settlement and lateral drift
Differential Settlement for
Multi-Bay Multi-Story Structures
Analysis of braced frame
Soil settlement for A and B series - vertical loads only
Differential Settlement for
Multi-Bay Multi-Story Structures
Analysis of braced frame
Comparison between braced systems
Differential Settlement for
Multi-Bay Multi-Story Structures
Analysis of braced frame
Soil settlement for C and D series - vertical + lateral loads
Differential Settlement for
Multi-Bay Multi-Story Structures
With vertical loads only With vertical + lateral loads
NARC II Application
Analyzed arched frame
NARC II Application
Main soil profile
NARC II Application
Material nonlinearity
Modeling
Material nonlinearity
Material modeling
Concrete in compression
Concrete in tension
Reinforcing steel in compression and tension
Modeling
Material nonlinearity
Analysis of RC sections
Concrete
Reinforcing steel
Modeling
Material nonlinearity
Analysis of RC sections
Forces and moment in concrete
Finite element model
Modeling
Material nonlinearity
Analysis of RC sections
Forces and moment in reinforcing steel
Modeling
Material nonlinearity
Analysis of RC sections
Newton Raphson iteration
Geometric nonlinearity
Modeling
Geometric nonlinearity
Structure modeling
Modeling
Structure modeling
Soil models
Linear Winkler's model
Nonlinear Winkler's model
Linear continuum model
Nonlinear continuum model
Modeling
Soil models
Linear Winkler's model
Modeling
Soil models
Nonlinear Winkler's model
Modeling
Soil models
Linear continuum model
Concentrated load
Distributed load
Modeling
Soil models
Nonlinear continuum model
Modeling
Soil models
Relationship between Winkler's and continuum soil models
Winkler's model
Continuum model
Introduction
The parabolic shape is the best configuration compared to other geometrical shapes of the arch.
The optimal parabolic arch shape is attained when the arch span is three times as large as the arch rise.
The optimal tie reinforcement area for reinforced concrete parabolic arched frames can empirically be related to the arch span L, arch rise f, and arched girder cross sectional area Ac(Arch) as:
In order to control the deformations, it is better to stiffen the bending elements of the frame all together.
Objectives of the thesis
NARC II
(RC)
Material nonlinearity
Geometric nonlinearity
Soil-structure interaction
(4 models)
Soil nonlinearity
Nonlinear analysis of large span arched structure to give useful design recommendations
Differential settlement problems in multi-story structures
NARC II
Hattab 2003
SAP 2000 (ver.14)
87%
97%
Frame with isolated footings (sand continuum soil)
Nonlinear Analysis of Framed Structures
The drift of framed structure increases linearly with increasing loads up till cracking of reinforced concrete sections. Moreover, the frame exhibits nonlinear strain hardening response up till the ultimate strength, which is encountered when the rebar fails.
Conclusions
NARC II
(RC)
Material nonlinearity
Geometric nonlinearity
Soil-structure interaction
(4 models)
Soil nonlinearity
Soil-structure interaction should be taken into account; especially for weak soil conditions
Conclusions
For arch frame structure
L/f = 3
Optimum
The maximum ultimate capacity is reached when the columns coincide with the directions of arch tangents at the eaves.
The use of bracing systems has a great benefit to diminish the differential settlement and the deformations. In addition to better distributions for the internal forces could be obtained.
Conclusions
For multi-bay multi story structure
the superstructure stiffness is much smaller for flat slab compared to a solid slab system, the use of bracing is more beneficial for overcoming the structural problems arising from differential settlement for flat slab multi-story buildings.
Tested experimentally by Juvandes, 1999
and theoretically by Rovere, 2008
Tested by Al-Jubory, 1992
and theoretically by Al-Azzawy and Al-Obaidie, 2010
Tested by Al-Talaqany, 2007
and theoretically by Al-Azzawy, et-al, 2010
Tested by Vecchio and Emara, 1992
Tested by Trapko and Musial, 2010
Tested by Tang, et-al, 2005
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