DYNAMIC ANALYSIS OF BUILDING FOR

EARTHQUAKE LOADING

Abeysinghe A.M.C.M (E/02/001) Mayadunna P.G.S. (E/02/176) Chaturange E.I. (E/02/318)

Supervisor; Dr.K.R.B. Herath

Objectives

• Study of structural dynamics theories

• Modeling of structures for finite element analysis using SAP2000 and studying the behavior under earthquake loading

• Introducing of earthquake releases

How does an earthquake affect a building?

Earth quake …

Act in all direction

Make tension, shear, compression and bending forces to the building

Cause to make lateral distortionBuilding must be stiff against horizontal forces

In modern buildings

Steel frame Concrete frame

• Moment resistant frame

• Diagonal bracing

• Shear walls

• Cross wall

• Isolators

Doing the Engineering design, with model testing is not economical , time consuming and difficult to get accurate results

This can be done easily with SAP2000

How to introduce earthquake releases

Our trials are for

1.Moment resistant frame (five storey frame)

2.Two storey building with rubber isolators

3.Four storey building with shear walls

First stage

Second stage20-story building which was already designed

1.Moment resistant frame ( Five story)

Dead loads (KN/m)

Roof - 2.93

Floor - 10.74

Live loads (KN/m)

Roof - 1.22

Floor - 3.66

2. Two storey building with rubber isolators

Steel

E = 200 GPa

Poisson's ratio = 0.3

Vertical loading (KN/m2)

Roof

3.59 DL

0.96 LL

Floor

5.98 DL

4.79 LL

6” conc. slab for roof

10” conc. slab for floor

Beams W24X55

Column W14X90

Rubber isolator properties

Vertical stiffness =1750 MN/m

Initial Shear stiffness in each direction = 1750 KN/m

3. Four storey building with shear walls

Vertical loading (KN/m2)

Roof

3.59 DL

0.96 LL

Floor

5.98 DL

4.79 LL

Fair way residencies

20 stories building

Rajagiriya

Disigned by Stems Engineering

Floor

5.98 DL

4.79 LL

Vertical loading (KN/m2)

Roof

3.59 DL

0.96 LL

When we design for an earth quake loading

We have to consider the material and system performance characteristics.

Ductility

Strength and stiffness

Shear walls

Horizontal diaphragms

Connections

Isolators

Moment resistant frame