Abstract

Shear and flexure performances of composite beams with different engineered cementitious composites (ECC) to self-consolidating concrete (SCC) depth ratio were investigated. Shear reinforced composite ECC/SCC beams showed similar behavior compared to their non-shear reinforced counterparts until the formation of diagonal cracks but exhibited higher ultimate shear resistance and ductility. Compared to the full depth SCC and full depth ECC beams, non-shear reinforced composite ECC/SCC beams showed higher ductility and energy absorption capacity. Composite ECC/SCC beams showed higher number of cracks with lower crack width because of fiber bridging and micro-cracking characteristics of ECC. Code based equations and other design specifications were conservative in predicting shear strength of shear/non-shear reinforced composite ECC/SCC beams. Composite ECC/SCC flexure beams showed satisfactory flexural performance compared to their full depth ECC and SCC counterparts.

Highlights

  • The use of new generation of High PerformanceConcretes (HPCs) such as Self-Consolidating Concrete (SCC), Engineered Cementitious Composite (ECC) and Ultra High Strength/Performance Concrete (UHSC/UHPC) can significantly improve the process of casting through self-consolidation as well as improve strength, ductility and durability of structures

  • It presents research conducted on beams/composite beams made of ECC, SCC and UHPC materials as well as shear/flexural design procedures of ECC, SCC and ECC/SCC beams/composite beams based on Codes and other existing design specifications

  • 4.4 Summary In this chapter, the shear and flexure performance of ECC, SCC and composite ECC/SCC beams were described based on the experimental results

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Summary

A Thesis Presented to Ryerson University

I hereby declare that I am the sole author of this thesis. This is a true copy of the thesis, including any required final revisions, as accepted by my examiners. I authorize Ryerson University to lend this thesis to other institutions or individuals for the purpose of scholarly research. I further authorize Ryerson University to reproduce this thesis by photocopying or by other means, in total or in part, at the request of other institutions or individuals for the purpose of scholarly research. I understand that my thesis may be made electronically available to the public. Md. Saiful Hasib Master of Applied Science, 2016 Department of Civil Engineering Ryerson University, Toronto, Canada

Summary 89 CHAPTER FIVE
Theoretical calculation of predicted shear strength of “E25-S75” beam 98
CHAPTER ONE INTRODUCTION
Research significance
Research objectives and scopes
Thesis Outline
Introduction The use of new generation of High Performance
Introduction
Applications of SCC
Role of Fibers
Role of Aggregates
Compressive
Flexural Strength
Shear Strength
Research on structural performance of SCC, ECC, FRC and composite beams
Shear transfer mechanism beams with shear reinforcement
Shear strength of SCC members
Shear strength of steel fiber reinforced UHPC beams without stirrups
Shear strength of FRC beams with stirrups
Shear strength of composite beams Hussein and
Flexural strength of SCC beam
Flexural Strength of ECC beam Lepech and
Flexural Strength of UHPC beam
Shear beams
Flexural beams
Reinforcement properties
Experimental set up and instrumentation
Introduction This
ECC, SCC and composite ECC/SCC shear beams without shear reinforcement
Load vs deflection behavior
Failure mode and cracking behavior
Post cracking shear resistance, ductility and energy absorption capacity
ECC, SCC and composite ECC/SCC shear beams with shear reinforcement
Strain development in the flexural and shear reinforcement
FLEXURAL BEAMS
Failure mode, crack pattern and ultimate load capacity
Strain development in flexural and shear reinforcements
Ductility behavior and energy absorption of flexural beams
Bending moment and development of beam end rotation
Development of flexural strength prediction equation of composite ECC/SCC flexural beams
Shear strength prediction of ECC, SCC and composite ECC/SCC beams without shear reinforcement
Theoretical calculation of predicted shear strength of “Full ECC” beam Using
Theoretical calculation of predicted shear strength of E25-S75 (quarter depth ECC) beam
Shear strength prediction of ECC, SCC and composite ECC/SCC beams with shear reinforcement
Theoretical calculation of predicted shear strength of “Full ECC-S” beam
Theoretical calculation of predicted shear strength of E50-S50-S (half depth ECC) beam
Theoretical calculation of predicted shear strength of E25-S75-S (quarter depth ECC) beam
FRC beam without shear reinforcement
PVA-ECC beams without shear reinforcement
FRC/ECC beams with polypropylene (PP) and steel fiber with shear reinforcement
Moment capacity of ECC, SCC and composite ECC/SCC flexural beams
Detail calculation of moment capacity prediction of ECC, SCC and composite ECC/SCC flexural beams
Theoretical calculation of predicted moment capacity of “Full ECC-F” beam
Theoretical calculation of predicted moment capacity of E25-S75-F (quarter depth ECC) beam
Findings
Recommendations for future research studies
Full Text
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