International Concrete Abstracts Portal

Showing 1-5 of 11 Abstracts search results

Document: 

SP183

Date: 

May 1, 1999

Author(s):

Editor: T.C. Schaeffer / Sponsored by: Joint ACI-ASCE Committee 421

Publication:

Symposium Papers

Volume:

183

Abstract:

This Symposium Publication consists of 10 papers that give the designer an overview of some of the different analysis and design techniques currently being used. Note: The individual papers are also available as .pdf downloads.. Please click on the following link to view the papers available, or call 248.848.3800 to order. SP183

DOI:

10.14359/14176


Document: 

SP183-10

Date: 

May 1, 1999

Author(s):

S. Alexander

Publication:

Symposium Papers

Volume:

183

Abstract:

A part from column-slab connections, almost all reinforced concrete connections can be analyzed and designed using plastic strut and tie models. The strut and tie model provides a simple, rational and highly transparent explanation for the flow of forces within a connection. By examining a unique substructure within a column-slab connection, Alexander and Simmonds (1) develop what amounts to a plastic strut and tie model for concentrically loaded connections between interior columns and two-way slabs with orthogonal reinforcement. On the basis for this model, a general design procedure for gravity-loaded column-slab connections has been developed. The resulting design procedure is simple and it handles column-slab connection problems that are not easily analyzed by existing code provisions. This paper outlines the design procedure and the important features of the model upon which it is based. The model is compared both to existing test results in the literature and to the ACI code design procedure. Two design examples are included.

DOI:

10.14359/5869


Document: 

SP183-01

Date: 

May 1, 1999

Author(s):

S. Simmonds

Publication:

Symposium Papers

Volume:

183

Abstract:

The justification for using elastic frame analogies to determine design moments in two-way slab systems is discussed. A brief history of two-way reinforced concrete slab design leading to the current code procedures is presented. This history includes a description of the various elastic frame analogies that have existed in past codes, the reasons for changes and the research leading to improved frame analogies. This is followed by a critical review of the Equivalent Frame Method in the current code with suggestions for improving and simplifying provisions for elastic frame analogies in future codes.

DOI:

10.14359/5531


Document: 

SP183-02

Date: 

May 1, 1999

Author(s):

S. Woodson and T. Krauthammer

Publication:

Symposium Papers

Volume:

183

Abstract:

Traditionally, U.S. Government agencies have developed and maintained manuals for the design of structures to resist severe dynamic loads, I.e. blast effects. However, such manuals have been primarily directed toward structures of a military nature, and relatively little attention has been given to the design of civilian buildings to resist blast effects. The lack of concern for the blast resistance of buildings is no surprising in that the threat has been minimal. Although some design guidance for blast resistance has been available to the general public, the primary users have been petro-chemical industries that are aware of potential accidental explosions related to their normal operations (I.e., chemical plants). Historically, general design guidance, such as that of the American Concrete Institute's Committee 318 (ACI, 1995) (1) has served the public well. However, two recent events, the World Trade Center and the Alfred P. Murrah explosions, have heightened awareness in the United States of the potential need to consider blast effects in the design of some buildings. The discussion presented herein summarizes existing blast-resistant design approaches and addresses issues that are critical to the development of buildings with improved resistance to severe dynamic loads. Emphasis is given to the design and behavior of reinforce concrete structures.

DOI:

10.14359/5532


Document: 

SP183-03

Date: 

May 1, 1999

Author(s):

S. Megally and A. Ghali

Publication:

Symposium Papers

Volume:

183

Abstract:

Design of connections of columns to flat slabs to ensure safety against punching failure is presented. The connections transfer shearing forces and moments between the columns and slabs. The objective is to cover the design procedure in most practical situations including: interior, edge and corner columns, prestressed and nonprestressed slabs, slabs with openings and slabs with shear reinforcement. The ACI 318-95 code requirements are adhered to where applicable. The designs are demonstrated numerical examples. Design of shear reinforcement in raft slabs, footings and walls subjected to concentrated horizontal forces is also discussed.

DOI:

10.14359/5533


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