Shear strength of reinforced concrete beams under distrbuted loading

Dissertant

Husayn, Alya Husayn M.

Thesis advisor

Sarsam, Qays Fuad
Muhammad, Basman R.

University

University of Technology

Faculty

-

Department

Department of Building and Construction Engineering

University Country

Iraq

Degree

Master

Degree Date

2012

English Abstract

Research indicates that uniformly distributed toading leads to higher reinforced concrete beam shear capacity, compared to 1 or 2 point loading.

For example, this fact is indicated quite clearly ط the two basic design equations of the ACI Code, where ACI Eq.(11.3) uses only yffc that does not include the effect of load distribution; while in contrast the more detailed ACI £q.(11.5) is essentially influenced by the load distribution, as reflected in the term Vud/Mu.

In this work, twelve beams have been tested to study the effect of load distribution as reflected by comparing the influence ofloading type on reinforced concrete beam concrete shear capacity: 1,2,4 and 8 point loading.

Test results from this work, in addition to several tests from the literature, have shown that shear design Vdes should take into account other factors in addition to concrete compressive strength/c.

Two design equations are proposed in this work which reflects, in addition to/c, Pw, the factor Vud/Mu.

One of these equations, which include the size effect (390/d), has proved to be more accurate than existing code and research equations.

This size effect (400/d) is reflected in the BS code method which indicates one of the better methods for predicting Vdes, based on this work.

Of the 200 test results obtained from the literature (all beams without stirrups failing in shear), it was found that the highest coefficient of variation (COV) of the ratio VTest/VüEs was obtained for the less detailed methods (ACI ه CAN) at 32.0 %, both ACI & CAN using yffc only for shear capacity.

The COV value of 32.0% by ACI Eq.(11.3) drops significantly to 27.1% when the details ACI Eq.(11.5) are used.

The same results have shown a COV of 16.8% and 17.1% for the detailed and simple proposed design equation, respectively.

Other design methods have been compared (NZ Code, design proposals by Zsutty and Sarsam and Al-Musawi).

These led to varying COV results between 21.9-33.6%.

Main Subjects

Engineering & Technology Sciences (Multidisciplinary)

Topics

• Mechanical properties

• APA
• MLA
• AMA

Language

English

Data Type

Arab Theses

Record ID

BIM-418739