The third workshop on ‘Seismic Behaviour of Irregular and Complex Structures’ was held in Florence, Italy from September 17 to 18 2002, organized by Prof. M. De Stefano and hosted by the Construction Department in the College of Architecture, at the University of Florence. The Workshop was sponsored by Task Group 8 of the EAEE. Thirty-five specialists from 8 countries participated in the Workshop.

Keynote Addresses:

Prof. Guido Sarà, Senior Professor, College of Architecture, University of Florence

The role of irregularity in the assessment of seismic vulnerability

Prof. Luis Esteva, President, International Association for Earthquake Engineering

Seismic response of irregular buildings: implications for performance-based design.

Session 1: Asymmetric 1-storey buildings

Castillo R., Paulay T., Carr A.

Design concepts for ductile single mass asymmetric systems.

Tso W.K., Myslimaj B.

A design oriented approach to strength assignment in asymmetric structures.

De Stefano M., Pintucchi B.

Inelastic response of plan-asymmetric building structures accounting for interaction phenomena in vertical resisting elements

De Stefano M., Pintucchi B.

Behaviour of asymmetric structures under multi-component earthquake excitations

Peruš I., Fajfar P.

On inelastic seismic response of asymmetric single-storey structures under biaxial excitations.

Trombetti T., Gasparini G., Silvestri S.

A new simplified approach to the analysis of torsional problems in eccentric systems: the “alpha” method

Trombetti T., Gasparini G., Silvestri S.

Verifications of the predictive capabilities of the “alpha” method through shaking table tests and field data analyses

Zárate G., Ayala A. G.

Formulation of a single storey structural model equivalent to a multi-storey asymmetric building for use in torsion studies

Session 2 – Asymmetric multistorey buildings

De Stefano M., Marino E., Rossi, P.P.

The role of overstrength on the seismic behaviour of multi-storey regularly asymmetric Buildings

Fajfar P., Marušic D., Magliulo G., Perus I.

Simplified non-linear analysis of asymmetric buildings

Kilar V., Fajfar P.

Seismic analysis of eccentric R/C buildings by the N2 method

Garcia, O., Ayala A.G., Chípol A.

Influence of the spatial variation of the stiffness centre on the level of asymmetry in buildings

Özmen G.

Torsional irregularity in symmetric structures

Özmen G.

A parametric study of multi-story structures with excessive torsional irregularity

Tavera E., Ayala A. G.

Simplified method for the non-linear seismic performance evaluation of asymmetric Buildings

Torres L., Ayala A. G.

A new procedure for the performance based seismic design of asymmetric buildings

Session 3 – Irregular buildings in elevation

Bosco M., Ghersi A., Marino E., Rossi P.P.

Effects of in-elevation irregularity on the elastic seismic response of in-plan asymmetric buildings

Ghersi A., Marino E., Rossi P.P.

Analytical and numerical determination of the exact location of the optimum torsion axis

Magliulo G., Ramasco R., Realfonzo R.

A critical review of the Eurocode 8 provisions for vertically irregular frames

Session 4 – Tests and Experimental Techniques

Karadogan F., Yuksel E. Mourtage W., Kerem A.

Experimental and numerical works on an alternative strengthening technique for irregular R/C buildings

Negro P. and Mola E.

Current assessment procedures: application to regular and irregular structures compared to experimental results.

Session 5 - Code specifications for irregular buildings

De Stefano M., Ghersi A., Marino E., Rossi P.P.

Comments on Eurocode 8 torsional provisions.

García O., Ayala A.G., Chípol A., Ortega J., Ortíz A., Juárez A.

Torsional effects in multi-storey buildings designed in accordance with the Mexican seismic code.

Heidebrecht A.C.

Changes in Requirements for irregular structures in the seismic provisions of the National Building Code of Canada

Session 6 - Special cases of irregularity

Gülay F. Gg,  Sen B., Teymür Tuğa P.

An Investigation on behavior of slabs with large openings under earthquake loading

D’Ambrisi A., De Stefano M., Tanganelli M.

Torsional behaviour of a medieval masonry tower under moderate seismic excitations

Rutenberg A., Leibovich E.

The “Irregular” post-yield behaviour of regular multistorey wall structures

Zembaty Z., Rutenberg A.

Response spectra with non-homogeneous, site amplification effects

Panel Session:

Research needs in the field of seismic behaviour of irregular structures and future activities of Task Group 8

(Moderators: P. Fajfar &. A. Rutenberg).

For CD ROM Proceedings of the Workshop contact:

Prof. M. De Stefano

Universita di Firenze

Dipartimento di Costruzioni

Piazza Brunelleschi  6

50121 Firenze, ITALY

A. Rutenberg and M. De Stefano