Research into shear strength of prestressed concrete beams

Dissertant

Muhalhil, Jasim Muhammad

University

University of Technology

Faculty

-

Department

Department of Building and Construction Engineering

University Country

Iraq

Degree

Master

Degree Date

2006

English Abstract

This research involved a proposed method for calculating the shear strength in prestressed concrete beams with and without web reinforcement.

The effect of the concrete strength, shear span to effective depth ratio, prestressed and non-prestressed reinforcement ratios and effective prestressed force on the shear strength are studied.

An expression is found for calculating the web-shear cracking load in which the effect of shear span to effective depth ratio is involved.

On the other hand the shear force causing shear-compression failure can be predicted after estimating the ultimate bending moments for such failure.

Ultimate moment capacity can be calculated from an equation in which some parameters such as F, K and ku are calculated from empirical expression.

Where : F : is a correction factor.

K : Factors relating to the distribution in the compression zone and a shear compression failure.

ku : ratio of depth to the inclined crack at failure to effective depth.

For the purpose of comparison, more than one code of practice is involved in the current research.

In addition, some research equations are listed also for the same purpose.

201 prestressed beams were without web reinforcement.

54 of these beams were rectangular and the remaining 147 had I-section.

In addition, 81 test results for prestressed concrete beams with web reinforcement were involved in the current research.

For the purpose of this investigation the beams are divided into two groups according to their types of failure.

The group containing only the beams failing by web-shear is denoted by [WS] while the group containing those beams failing by shear-compression is denoted by [FS].

Also for estimating a suitable expression for tensile strength 257 of test results from other researches was reported.

Other test results were used to prove that the assumption of the mean effective prestressed, fcp is acceptable, to represent the mean stress induced in the concrete cross-section.

Further in the current research computer programs are used for calculating the shear strength by the following code design methods.

Main Subjects

Civil Engineering

Topics

• Concrete

• APA
• MLA
• AMA

Language

English

Data Type

Arab Theses

Record ID

BIM-305577