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Hi, Folks ! Welcome to
Structural Analysis I
Hae Sung LeeStructural Analysis Lab, Dept. of Civil and Environmental Eng.
Seoul National UniversitySpring Semester, 2011

Structural Analysis Lab
Seoul National University
http://strana.snu.ac.kr
Who’s who ? Instructor : Lee, Hae Sung (이해성)
Office : 35-408
Tel : 880-8388
e-mail : [email protected]
Hompage : http://strana.snu.ac.kr
TA : Goh, Heedong/Lee, Hohyun (32-303, 1538)(고희동) (이호현)
Class Hours : Wed. 17:00-18:40Fri. 17:00-17:50Fri. 18:00-18:50 (Practice)

Structural Analysis Lab
Seoul National University
http://strana.snu.ac.kr
Text & Other Tools
Class note by Instructor
Reference- Structural Analysis - Classical and Matrix Approachby Jack C. McCormac and R. E. Elling
- Elementary Structural Analysis 4th Ed. by C. H. Norris- Statically Indeterminate Structures by Chu-Kia Wang
SNUSEA

Structural Analysis Lab
Seoul National University
http://strana.snu.ac.kr
Class Contents Introduction of Structural Analysis (1)
Types of Structures and Supports (1)
Free-Body Diagram (2)
Forces and Moments and Their Diagram (2-3)
Analysis of Various Statically Determinate Structures (4-5)
Virtual Work Principles and Related Issues (6-8)
Introduction of Statically Indeterminate Structures (9)
Flexibility Method for Analyzing Statically IndeterminateStructures (10-13)
Influence Lines (14-16)

Structural Analysis Lab
Seoul National University
http://strana.snu.ac.kr
Evaluation 2 Mid Term Exams(April 8, May 13) : 40 %
Final Exams (June 16, 16:00-19:00) : 30 %
Home work and attendance : 30 %

Structural Analysis Lab
Seoul National University
http://strana.snu.ac.kr
Aah….Structural Analysis !!
1

Structural Analysis Lab
Seoul National University
http://strana.snu.ac.kr
Structure ?? Definition by Late Prof. Shin
Thing built to safely withstand all possible external forces applicable during itsexpected lifetime by properly connecting solid materials with various shapesaccording to its purpose.
Definition by Live Prof. LeeEverything made by solid materials that you can see !!!
Types Mobile structures : Cars, Airplanes, shipFixed structures : Civil structures (social infrastructures) & Buildings
Purpose : Bridge, Dam, Tunnel, Building…
Material : Wooden, Steel, Concrete…
Mechanical Behavior : Beam, Truss, Arch, Frame…

Structural Analysis Lab
Seoul National University
http://strana.snu.ac.kr
Human BodyThe most sophisticated structures in the world designed by God!!!
Shell
Beam
Arch
Column
Footing

Structural Analysis Lab
Seoul National University
http://strana.snu.ac.kr
Force Newton’s Second Law of Motion
Gravity – Newton’s Law of Gravitation:
Dynamic Force :
Water, Earth and Wind Pressure…

Structural Analysis Lab
Seoul National University
http://strana.snu.ac.kr
City & Structure (1)

Structural Analysis Lab
Seoul National University
http://strana.snu.ac.kr
City & Structure (2)

Structural Analysis Lab
Seoul National University
http://strana.snu.ac.kr
Bridge (1)

Structural Analysis Lab
Seoul National University
http://strana.snu.ac.kr
Bridge (2)

Structural Analysis Lab
Seoul National University
http://strana.snu.ac.kr
Bridge (3)

Structural Analysis Lab
Seoul National University
http://strana.snu.ac.kr
Building (1)

Structural Analysis Lab
Seoul National University
http://strana.snu.ac.kr
Building (2)

Structural Analysis Lab
Seoul National University
http://strana.snu.ac.kr
Building (3)

Structural Analysis Lab
Seoul National University
http://strana.snu.ac.kr
Cultural Facility (1)

Structural Analysis Lab
Seoul National University
http://strana.snu.ac.kr
Cultural Facility (2)

Structural Analysis Lab
Seoul National University
http://strana.snu.ac.kr
Troublesome Structures

Structural Analysis Lab
Seoul National University
http://strana.snu.ac.kr
Different Structures with same idea

Structural Analysis Lab
Seoul National University
http://strana.snu.ac.kr
Different Structures with same idea

Structural Analysis Lab
Seoul National University
http://strana.snu.ac.kr
Classification Mechanical Behaviors
- Beam (들보)- Truss (트러스)- Frame (강절 뼈대, Rahmen)- Arch- Plate and Shell (판 및 쉘 )- General Continuous structures (일반적인 연속체 구조물)
Analysis Method (existence of redundancy)- Statically Determinate (정정구조물)- Statically Indeterminate (부정정구조물)

Structural Analysis Lab
Seoul National University
http://strana.snu.ac.kr
Beam

Structural Analysis Lab
Seoul National University
http://strana.snu.ac.kr
Truss

Structural Analysis Lab
Seoul National University
http://strana.snu.ac.kr
Frame

Structural Analysis Lab
Seoul National University
http://strana.snu.ac.kr
Arch

Structural Analysis Lab
Seoul National University
http://strana.snu.ac.kr
Structural Engineering ?? Objective
- Design and construction of structures- Management, maintenance and rehabilitation of structures
Tools- Solid and applied mechanics- Mathematics and numerical methods- Experiences, experiments and statistical data
In Consideration of - Safety and economics- Manageability, maintenance and rehabilitation- Harmony with surroundings (environmental and aesthetic)

Structural Analysis Lab
Seoul National University
http://strana.snu.ac.kr
Engineering Design ?
Trial SystemInput Response
SatisfyDesign Criteria ?No !!
Modify System
Yes !!
Final System
Analysis
Satisfy Budget ?No !! Yes !!
Design

Structural Analysis Lab
Seoul National University
http://strana.snu.ac.kr
Sequence of Structural Construction Feasibility Study
- Economical and Engineering Aspects
Determination of Structural type and Material
Structural Analysis
Preliminary Design
Main Design
Construction- Design and construction of temporary structures- Construction management- Design change
Management and Maintenance
Design Process

Structural Analysis Lab
Seoul National University
http://strana.snu.ac.kr
Structural Analysis ??? Objective
- Calculation of structural responses such as stress, strain anddisplacement for given structural properties and external loadingconditions
Purpose- To calculate structural responses as accurately as possible for all
loading conditions applicable during the lifetime of a structure forthe design of a safe and economical structure.
Tools- Healthy body and Smart Brain (Study)- Mathematics (Linear algebra, Calculus, Differential Equation...)- Physics (Statics and Dynamics- Numerical Method (Computer)- Experiments

Structural Analysis Lab
Seoul National University
http://strana.snu.ac.kr
Classification of Classic Mechanics
Mechanics(역 학)
Granular Mechanics(분 체 역 학)
Thermo Mechanics(열 역 학)
Solid Mechanics(고 체 역 학)
Fluid Mechanics(유 체 역 학)
Structural Analysis(구조 해석)

Structural Analysis Lab
Seoul National University
http://strana.snu.ac.kr
Classification of Engineering Problems Direct Problems : ∇⋅(k∇⋅ u) = f (Analysis)
Inverse Problems : Reconstruction
Inverse Problems : System Identification
SystemInput Response
SystemInput Measured Response
SystemInput Measured Response
ErrorError
Error
Error

Structural Analysis Lab
Seoul National University
http://strana.snu.ac.kr
Types of Structural Analysis Loading Speed
- Static analysis : neglecting inertia force- Dynamic analysis : with inertia force
Unknowns- Flexibility method : Forces are unknown.- Stiffness method : Displacement is unknown.
Tool- Classic method : (pensile + Paper + Brain + Hand)- Computational method : (…+ Computer)
Distribution of Unknowns- Discrete structure (ODE)- Continuous structure (PDE)

Structural Analysis Lab
Seoul National University
http://strana.snu.ac.kr
Structural Division ofDept. of Civil and Environmental Eng.
Seoul National University

Structural Analysis Lab
Seoul National University
http://strana.snu.ac.kr
Professors
Prof. Hyun Moo KohStructural Engineering Lab.http://sel.snu.ac.kr
Prof. Jae Kwan KimStructural Dynamics Lab.http://dyna.snu.ac.kr
Prof. Hae Sung LeeStructural Analysis Lab.http://strana.snu.ac.kr
Prof. Jae Yeol ChoConcrete Structures Lab.http://concrete.snu.ac.kr
Prof. Ho Kyung KimStructural Design Lab.http://bridge.snu.ac.kr

Structural Analysis Lab
Seoul National University
http://strana.snu.ac.kr
Course Semester Title Contents
Under-
graduate
2-1
2-2
3-1
3-2
4-1
Mechanics of Materials
Applied Dynamics
Structural Analysis 1
Structural Analysis 2
Structural Information Eng.
Statics
Dynamics
Flexibility Method
Stiffness Method
Structural System
Master’s
Course
1-1
1-1
1-1
1-2
1-2
1-2
2-1
Adv. Structural Analysis
Elasticity 1
Structural Stability 1
Finite Element Method
Dynamics of Structures
Structural Reliability
Theory of Plates & Shells
Advanced Analysis
Continuum Analysis
Buckling Analysis
Computational Analysis
Dynamic Analysis
Probability Analysis
Plates & Shells Analysis
Doctor’s
Course
Plasticity
Structural Optimization
Elasticity 2
Structural Stability 2
Plasticity
Optimized Design
Large Deformation
Advanced Buckling
Course Semester Title Contents
Under-
graduate
3-1
3-2
4-1
4-2
Theory of Reinforced Concrete and Lab. 1 Theory of Reinforced Concrete and Lab. 2 Design of Steel Structures Introduction to Bridge Design
Concrete Structure
Concrete Structure
Steel Structures Bridge Design
Graduate
Advanced Reinforced Concrete Design Advanced Reinforced Concrete Mechanics Advanced Bridge Engineering Coastal Engineering Computational Structure Design Fundamentals of Earthquake Engineering
Non-elastic Design Fracture Analysis Advanced Analysis
Coastal Engineering
Design Automation Earthquake Engineering
ClassesAnalysis Lecture Design Lecture

Structural Analysis Lab
Seoul National University
http://strana.snu.ac.kr
Advanced Structural Analysis
Class TreeMechanics of
Materials
Structural Analysis 1
Structural Analysis 2
Theory of Applied Dynamics
Structural Information Engineering
Theory of Elasticity
Finite Element Method
Dynamics of Structure
Theory of Plates and Shells
Theory of Reinforced Concrete and Lab.
Design of Steel Structures Design
Introduction of Bridge Design
Structural ReliabilityAdvanced Reinforced
Concrete Design
Advanced Structural Analysis and Research Advanced Structural Design and Research