Seismic Design Methodologies for the Next Generation of Codes

P. Fajfar

• Publisher: Routledge
• Year: 2019
• Print ISBN:
  9789054109280
• eBook ISBN:
  9781351417198
• Topic: Technology & Engineering
• Subtopic: Civil Engineering
• Index: Technology & Engineering

These proceedings, arising from an international workshop, present research results and ideas on issues of importance to seismic risk reduction and the development of future seismic codes.

A deformation-based seismic design procedure for structural wall buildings

Hugo Bachmann & Alessandro Dazio

Swiss Federal Institute of Technology (ETH), Zürich, Switzerland

ABSTRACT: A deformation-based procedure for the seismic design of buildings with ductile reinforced concrete structural walls is proposed. Firstly, emphasis is given to the conceptual design of the whole building consisting of beamless flat slabs, thin columns, a few relatively slender structural walls and non-structural elements. The preliminary design of the structure performed by simple hand calculations starts from acceptable deformations. The deformation criterion is the acceptable storey drift resulting either from the damage limit state of partition walls and facade elements under the serviceability earthquake or from the structural ultimate limit state under the ultimate design earthquake. The acceptable storey drift yields the required stiffness of the whole system. From the estimated contribution of frame action to the system stiffness, the required stiffness of the walls is readily determined. Consequently the required wall dimensions can be calculated. After checking simple strength and ductility criteria the walls can be designed and detailed following the “classical” capacity design method. The proposed deformation-based procedure leads directly to the design goal and avoids laborious iterations with regard to acceptable deformations.

1 INTRODUCTION

In Switzerland and in other regions of Central Europe the earthquake hazard was underestimated for a long time. But over the last few years it was recognized that much more effort is necessary to make structures safer for earthquake actions. An essential need for action exists especially in the case of multi-storey office and factory buildings, where lives and property of many people can be endangered. Such buildings are often structures with a separation of the load carrying function and partitioning function of vertical elements, i.e. structural elements such as columns, and non-structural elements such as partition walls and facade elements. Particularly, in such structures no structural masonry walls are used.

Structural wall systems, shown in Fig.l, exposed to earthquake are very efficient. Such structures consist of flat slabs, columns designed for gravity loads only and structural walls:

- Flat slabs are beamless concrete slabs made of ordinary reinforced concrete or they may be prestressed in the case of spans of more than about 7m. Flat slabs are often strengthened around columns to prevent punching shear failure.

- ...

Table of contents

• Cover
• Half Title
• Title Page
• Copyright Page
• Table of Contents
• Preface
• List of participants
• Resolutions
• Conclusions and recommendations
• Performance-based seismic engineering: A critical review of proposed guidelines
• Defining performance objectives
• Opportunities and challenges – Development of performance-sensitive engineering
• Research issues in performance based seismic engineering
• Development of performance-based design methodology in Japan
• Opportunities and pitfalls of performance based seismic engineering
• International comparisons of concrete element strength requirements in seismic codes
• Seismic design with vertical earthquake motion
• Seismic detailing of reinforced concrete structures and performance-based codes
• Uncertainties associated with ductility performance of steel building structures
• The improvement of the seismic-resistant design for existing and new structures using damage concept
• Extreme of structural characteristic factor to reduce seismic forces due to energy absorbing capacity
• Seismic damage evaluation treated as a low-cycle fatigue process
• Evaluation of seismic performance parameters
• A deformation-based seismic design procedure for structural wall buildings
• Concepts and procedures for direct displacement-based design and assessment
• A simplified nonlinear method for seismic damage analysis of structures
• Displacement-based design of RC buildings: Proposed approach and application
• Performance level criteria and evaluation
• Development and application of a displacement-based design approach for moment-resisting frame structures
• Partial inelastic analysis procedure for optimum capacity design of R/C buildings
• A simple approach for evaluating performance levels of moment-resisting steel frames
• Estimation of maximum interstory drift demands in displacement-based design
• Performance assessment for a reinforced concrete frame building
• Inelastic analysis techniques in seismic evaluations
• A behaviour-based design approach to earthquake-induced torsion in ductile buildings
• On the seismic performance of yielding asymmetric multistorey buildings: A review and a case study
• Seismic response of asymmetrical buildings using pushover analysis
• Seismic resistance verification of masonry buildings: Following the new trends
• Masonry infilled frames as an effective structural sub-assemblage
• Seismic analysis of viaduct structures – Which method to choose?
• Effect of foundation interaction on reduction factor of RC piers
• The 1996 Japanese seismic design specifications of highway bridges and the performance based design
• A displacement-based design approach for seismically isolated bridges
• Performance-based design of seismic restrainers for simply-supported bridges
• Notes on definitions of overstrength factors
• Author index