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Open Access 2023 | Open Access | Buch

Strand Corrosion in Prestressed Concrete Structures

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Über dieses Buch

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This book focuses on the durability problems of existing prestressed concrete (PC) structures caused by strand corrosion, clarifies the mechanical behavior of corroded prestressing strands, corrosion-induced cracking, bond degradation, prestress loss and structural performance deterioration, and proposes the corresponding prediction models. Its aim is to provide the knowledge, tools, and methods to understand the deterioration phenomena of PC structures. We hope that this text may be useful for those who work in the field of civil engineering. It is suitable for teachers and students majoring in civil engineering in universities, and researchers in the field of civil engineering. It is also suitable for practitioners of design institutes, construction units, supervising units and traffic management departments.

Inhaltsverzeichnis

Frontmatter

Open Access

Chapter 1. Brief Description of Prestressed Concrete Structures
Abstract
Strand corrosion can cause concrete cracking, degrade bond performance at the strand–concrete interface, lead to prestress loss, and deteriorate the capacity of prestressed concrete structures. This book clarifies the mechanical behavior of corroded prestressing strands, corrosion-induced cracking, bond degradation, prestress loss, and structural performance deterioration of prestressed concrete structures and proposes the corresponding prediction models, which has an important guidance for the durability and maintenance design of prestressed concrete structures.
Lei Wang

Open Access

Chapter 2. Mechanical Behaviors of Corroded Prestressing Strands
Abstract
Corrosion will reduce the cross-sectional area of strands and deteriorate the mechanical property of prestressing strands. In this chapter, nineteen corroded strands are obtained through controlling stress level, corrosion time, and chloride ion concentration under artificial climate conditions. Then, the size and geometry of corrosion pits are measured, and its probability distribution is investigated. Furthermore, static tensile tests are carried out to study the mechanical property of prestressing strands after corrosion. Following this, a constitutive model of corroded prestressing strand is proposed.
Lei Wang

Open Access

Chapter 3. Corrosion-Induced Cracking of Prestressed Concrete
Abstract
Strand corrosion can cause the cracking of prestressed concrete. In this chapter, the concrete cracking caused by strand corrosion under different prestress is experimentally studied. Then, a theoretical model, incorporating the coupled effects of prestress and strand corrosion, is proposed to predict the global process of prestressed concrete cracking. Following this, a meso-scale numerical model is established to simulate concrete cracking induced by the three-dimensional corrosion expansion of helical strands.
Lei Wang

Open Access

Chapter 4. Bond Behavior Between Strand and Concrete with Corrosive Cracking
Abstract
Bond behavior between strand and concrete plays a decisive role in sustaining the properties of prestressed concrete structures. This chapter mainly discusses the bond behavior between corroded strand and concrete. First, the effects of corrosion-induced crack on the bond between strand and concrete are studied based on the pull-out test; the confinement role of stirrups on the deterioration of bond behavior affected by concrete cracking is addressed. Next, the bond behavior of corroded strand in pretensioned concrete structures is investigated by the bending test; the effects of strand corrosion on force–slip curves, bond strength, and failure mode are discussed.
Lei Wang

Open Access

Chapter 5. Bond–Slip Model of Corroded Strand Considering Rotation Effect
Abstract
Corrosion leads to the cracking of concrete cover and degrades the bond strength of strand. This chapter theoretically analyzed the bond strength model of corroded strands by considering the rotation characteristics. First, an analytical model is developed to predict the bond strength of uncorroded strands by considering strand rotation. Then, the effect of corrosion-induced concrete cracking on the ultimate bond strength of corroded strand is analyzed theoretically. Finally, the theoretical model of bond strength of corroded strands is obtained.
Lei Wang

Open Access

Chapter 6. Prestress Loss and Transfer Length Prediction in Pretensioned Concrete Structures with Corrosive Cracking
Abstract
Concrete cracking caused by strand corrosion reduces bond strength and leads to loss of prestress and changes in transfer length. In this chapter, a model, considering the coupled effects of concrete cracking and bond degradation, is proposed to predict the corrosion-induced prestress loss in prestressed concrete structures at first. Then, an analytical model, considering the coupled effects of the Hoyer effect and corrosion-induced cracking, is proposed to predict the transfer length. The effects of strand corrosion on the effective prestress and transfer length are studied.
Lei Wang

Open Access

Chapter 7. Secondary Anchorage and Prestress Loss of Fractured Strand in PT Beams
Abstract
The effect of corrosion-induced strand fracture on residual prestress of post-tensioned concrete beams should be investigated fully to ensure the structural safety. An experimental test with five specimens is designed to investigate the secondary anchorage and residual prestressing force in locally corroded post-tensioned concrete beams after strand fracture. Then, an analytical method is proposed to determine the damage control section of locally corroded post-tensioned concrete beams after strand fracture for the flexural capacity evaluation. Following this, a numerical model is established to predict the secondary transfer length and residual prestress of fractured strand in post-tensioned concrete beams.
Lei Wang

Open Access

Chapter 8. Flexural Behaviors of Corroded Post-tensioned Concrete Beams
Abstract
The insufficient grouting and strand corrosion can affect the flexural behavior of prestressed concrete beams. An experimental study with twenty prestressed concrete beams is designed to study the effect of grouting defects and strand corrosion on the flexural performance of prestressed concrete beams. Corrosion effects on concrete cracking, post-cracking stiffness, ultimate strength, failure mode, and ductility are then clarified by the flexural test, and a coefficient is introduced to quantify the incompatible strain between corroded strand and concrete.
Lei Wang

Open Access

Chapter 9. Bearing Capacity Prediction of Corroded PT Beams Incorporating Grouting Defects and Bond Degradation
Abstract
Corrosion can reduce the sectional area of strand, induce concrete cracking, and degrade bond strength, which can further decrease the bearing capacity of prestressed concrete beams. First, an analytical model is proposed to predict the flexural bearing capacity of partially ungrouted post-tensioned concrete beams. Then, a prediction model of corroded prestressed concrete beams is established to calculate the incompatible deformation between strand and concrete under different load conditions.
Lei Wang
Metadaten
Titel
Strand Corrosion in Prestressed Concrete Structures
verfasst von
Lei Wang
Copyright-Jahr
2023
Verlag
Springer Nature Singapore
Electronic ISBN
978-981-9920-54-9
Print ISBN
978-981-9920-56-3
DOI
https://doi.org/10.1007/978-981-99-2054-9