For more information contact: Farhad Homayoun Shad

f.hshad@whitbybird.ae

Tel: +971 4 334 3616 Fax: +971 4 334 3617

Registration Deadline: 25 January 2009

Seismic Design using

Structural Dynamics (1997 UBC)

Ramboll Whitby & Bird and

S. K. Ghosh Associates Inc. jointly present a short course on

Wednesday 4 February 20091300 - 1800 hrs

Venue: American University in Dubai

SKG S. K. Ghosh Associates Inc.Seismic & Building Code Consulting

In cooperation with the American University in Dubai

• The Nature of Earthquake Forces in a

Structure

• Earthquake Ground Motion

• Response of Structures to Earthquakes

- Dynamic versus Satic Structural

Analysis

- Degrees of Freedom

• Dynamics of Single-Degree-of-Freedom

Systems

- Response Spectrum

- Smoothed Response Spectra

• Establishing Design Ground Motion(s) at

a Site

- Site-independent Procedures

- Site-dependent Procedures

• Design Spectra of the NEHRP Provisions

and the IBC

• Dynamics of Multi-Degree-of-Freedom

Systems

- Vibration Mode Shapes and Frequencies

- Modal Superposition Analysis of Earthquake

Response

- Response Spectrum Analysis

• Analysis Procedures

- Dynamic Analysis procedures

• Scaling of Results of Dynamic Analysis

• Response Spectrum Analysis per 1997

UBC

• Response Spectrum Analysis Example

Registration fee of AED 750 includes the seminar workbook and a metricated copy of the book ‘Seismic Design using Structural Dynamics (1997 UBC)’ By

Dr S. K. Ghosh

Seismic Design Using Structural Dynamics

Outline of a Short Course by S. K. Ghosh

This short course on “Seismic design using structural dynamics” is a follow-up of an earlier seminar: “Seismic design of RC structures using UBC / ACI Provisions” which was held in Dubai in November last year. The need for a review of the basis and proper application of dynamic analyses, which are extensively used for design of tall buildings in Dubai, was pointed out by many of the participants.

The course addresses the basic concepts of structural dynamics and the modal response spectrum analysis procedure according to the provisions of the 1997 UBC. The material is presented in a manner that most suits the practicing design engineer and demystifies the application of the UBC provisions for him or her. Thus classical theory and mathematics are avoided to the extent possible. A three-story, one-bay frame example is solved manually to illustrate the steps required for the determination of modal frequencies, mode shapes, and response spectrum analysis of structures. The detailed response spectrum analysis of a 20-story reinforced concrete building that utilizes a dual shear wall – frame system is also illustrated.

[ ]{ } [ ]{ } [ ]{ } { }( )tM u C u K u P+ + =

2( )2n n n n n n n tq q q pz w w+ + = Γ

Time [sec]20191817161514131211109876543210

Res

pons

e A

ccel

erat

ion

[g]

0.25

0.2

0.15

0.1

0.05

0

-0.05

-0.1

-0.15

-0.2

-0.25

max

1 1

2max

1 1 1

32 2

2 2 2

( )

( ) ( )

8 (1 )(1 ) 4 (1 )

N N

ij im jmj i

N N N

im ij im jmi j i

i j

ij ijij

ij ij ij

r r r

r r r r

r

r

z b br

b z b b

= =

= = =

≠

=

= +

+=

− + +

∑∑

∑ ∑∑

ElasticDuct. 1.5Duct. 2.0Duct. 2.5

Period [sec]43210

Res

pons

e A

ccel

erat

ion

[g]

0.7

0.65

0.6

0.55

0.5

0.45

0.4

0.35

0.3

0.25

0.2

0.15

0.1

0.05

0

www.skghoshassociates.com www.aud.edu

Topics

www.rambollwhitbybird.com