International Concrete Abstracts Portal

Showing 1-5 of 15 Abstracts search results

Document: 

SP127-01

Date: 

October 1, 1991

Author(s):

S. K. Ghosh

Publication:

Symposium Papers

Volume:

127

Abstract:

The purpose and scope of this special publication, which is concerned primarily with departures from and improvement upon code-based seismic design practice, are outlined. The broad underlying principles of wind and seismic design by current codes are discussed. Certain major deficiencies of current practice are pointed out. Comparative features of elastic and inelastic seismic structural response are outlined.

DOI:

10.14359/3002


Document: 

SP127-02

Date: 

October 1, 1991

Author(s):

Stuart D. Werner

Publication:

Symposium Papers

Volume:

127

Abstract:

This chapter summarizes fundamental concepts pertaining to the development of seismic input criteria for inelastic design of reinforced concrete structures. The chapter is organized into five main sections that describe concepts related to earthquake phenomena; ground-shaking characterization, geologic factors, and measurement; and the three principal approaches for defining seismic design spectra, and motion-time histories. Compilation of the information contained in this chapter was completed in early 1988; therefore, the concepts presented in the chapter are based on earthquake ground-motion data, results, and procedures developed up to that time.

DOI:

10.14359/3004


Document: 

SP127-03

Date: 

October 1, 1991

Author(s):

Jack P. Moehle and Stephen A. Mahin

Publication:

Symposium Papers

Volume:

127

Abstract:

Observations on the performance of reinforced concrete structures during past earthquakes are summarized and discussed. The review covers observations related to the structural concept, proportioning, and detailing. The review draws from experiences gained during numerous earthquakes, and includes observations of acceptable building performances as well as unacceptable ones. The repeated occurrence of many classes of damage and failure suggests lessons that should be learned.

DOI:

10.14359/3007


Document: 

SP127-04

Date: 

October 1, 1991

Author(s):

Daniel P. Abrams

Publication:

Symposium Papers

Volume:

127

Abstract:

This chapter serves as a primer to acquaint a novice with the vast amount of experimental data that has been acquired over the last two decades on behavior of reinforced concrete components subjected to repeated reversals of lateral force and earthquake response of concrete building systems. General characteristics of hysteretic behavior and dynamic response are presented rather than discrete summaries of each test program done to date. An extensive reference list presents over 400 publications that specifically address laboratory studies of reinforced concrete members, joints, or building systems. The listing is subdivided for laboratory investigations of (a) beams and beam-column joints, (b) columns, (c) walls, (d) frame and frame-wall systems, (e) coupled-wall systems, and (f) infilled-frame systems.

DOI:

10.14359/3009


Document: 

SP127-05

Date: 

October 1, 1991

Author(s):

Murat Saatcioglu

Publication:

Symposium Papers

Volume:

127

Abstract:

Characteristic features of reinforced concrete response relevant to hysteretic modeling are discussed. The relationships between hysteretic features, and design and detailing parameters are illustrated. Experimentally obtained hysteretic force-deformation relationships are used to demonstrate the significance of each hysteretic feature on modeling. A brief review of selected hysteretic models is presented, Strength, as defined by primary curve, stiffness degradation, strength decay, and pinching of hysteresis loops are discussed as basic features of hysteretic response. The mechanisms behind these features and related design and detailing parameters are presented. The significance of each of these parameters in terms of deformation components resulting from flexure, shear, and reinforcement extension/slip is discussed. The dominant response shows stable hysteretic loops with little or no strength decay within the realistic range of deformations. Therefore, a simple hysteretic model may be appropriate for modeling flexural response. Shear response as well as hysteresis loops resulting from reinforcement slippage show pinching action, and hence should be modeled accordingly. Axial compression, lack of shear/confinement reinforcement, and poor anchorage of members may lead to early and rapid strength decay. Strength decay may have to be considered in such members. Stiffness degradation during unloading and reloading is a characteristic feature of reinforced concrete response, and should be considered in modeling all deformation components.

DOI:

10.14359/3011


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