ANIL LABORATORY

Department of Civil and Environmental EngineeringTokyo Institute of Technology

Structural Engineering Mechanics of Materials

Anil C. WijeyewickremaURL: http://www.cv.titech.ac.jp/~anil-lab/

E-mail: wijeyewickrema.a.aa@m.titech.ac.jp

Laboratory Introduction

Anil C. Wijeyewickrema

Lab members

2

Research Introduction

• Nonlinear Dynamic Behavior of RC Columns due to Impact Loads

• Seismic Pounding Analysis of Buildings• Effects of Tsunami Loads on Structures• Analysis of Post-tensioned Masonry Structures

Structural Engineering

• Wave Propagation in Pre-stressed Elastic Media• Mechanics of Composite Materials• Elastodynamics

Mechanics of Materials

3

Nonlinear Dynamic Behavior of RC columns due to Impact Loads

4

Fig. 1 Finite element models: (a, b) Shipping container and (b) RC columns.

Fig. 3 Impact on square columns : (a) stress distribution, (b) damage at peak force and (c) damage at residual stage.

(c)(a) Exterior View (b) Interior View

Fig. 2 Impact Analysis carried out using LS-DYNA

Finite Element Analysis

Concrete structures: analysis and design

Basics of impact mechanics

Basics of structural dynamics

Numerical modeling and simulation

Seismic Pounding Analysis of Buildings

Fig. 1 Building pounding simulation.

Fig. 2 Horizontal displacement time history at a typical impact level.

Fig. 3 Maximum impact force variation at each impact level for different earthquakes.

Earthquake Engineering

Finite Element Method

Nonlinear Dynamic Analysis of Structures

Mechanics of Reinforced Concrete

Contact-Impact Mechanics

Finite element analysis of post-tensioned masonry walls

6

Structural analysis Finite-element methodDesign and simulation of

post-tensioned masonryReinforced masonryVerification of masonry

codes

Fig. 1 Details of finite-element model.

Fig. 3 Verification of current codes.

Anchored

Stressed

Fig. 2 Effects of horizontal reinforcement.

Vertical splitting

Without rebar With rebar (ρ=0.1%)

Vertical splitting

1.5 (ASCE-7)

Wave Propagation in Pre-Stressed Elastic Media

7

3x

2h

Direction of wave propagation

θ 1x

2x

O

, , ( , 1, 2,3)ij ij i jα γ ρ =

Fig. 1 Pre-stressed compressible elastic plate.

11x2x

3x

1

Fig. 2 Pre-stressed equilibrium configuration of a symmetric layered composite.

(a) (b)

Fig. 3 Dispersion curves for Blatz-Ko material at an angle of propagation θ =15°, (a) Symmetric, (b) Anti-symmetric motions.

Continuum Mechanics

Basics of Vectors and Tensors

Wave motionTheory of ElasticityComposite

materialsNon-linear Elasticity