Structural integrity monitoring of reinforced concrete structures. Part 1: evaluation of protection systems for extrinsic fibre Fabry–Perot sensors

2005 ◽  
Vol 27 (3) ◽  
pp. 411-419 ◽  
Author(s):  
G. Kister ◽  
D. Winter ◽  
J. Tetlow ◽  
R. Barnes ◽  
G. Mays ◽  
...  
Keyword(s):  
Reinforced Concrete ◽  
Structural Integrity ◽  
Concrete Structures ◽  
Reinforced Concrete Structures ◽  
Integrity Monitoring ◽  
Fabry Perot ◽  
Protection Systems

Damage of Reinforced Concrete Structures due to Steel Corrosion

2015 ◽  
Vol 1111 ◽  
pp. 187-192
Author(s):  
Corina Sosdean ◽  
Liviu Marsavina ◽  
Geert de Schutter
Keyword(s):  
Reinforced Concrete ◽  
Building Materials ◽  
Structural Integrity ◽  
Colorimetric Method ◽  
Concrete Structures ◽  
Steel Corrosion ◽  
Degradation Process ◽  
Reinforced Concrete Structures ◽  
Chloride Ingress ◽  
Rc Structures

Reinforced concrete (RC) became one of the most widely used modern building materials. In the last decades a great interest has been shown in studying reinforcement corrosion as it became one of the main factors of degradation and loss of structural integrity of RC structures. The degradation process is accelerated in the case of RC structures situated in aggressive environments like marine environments or subjected to de-icing salts. In this paper it is shown how steel corrosion of the embedded rebars occurs and how this affects the service life of reinforced concrete structures. Also, an experimental study regarding the combined effect of carbonation and chloride ingress was realized. Samples with and without rebars were drilled from a RC slab which was stored in the laboratory for two years. Non-steady state migration tests were realized in order to determine the chloride profile, while the carbonation depth was measured using the colorimetric method based on phenolphthalein spraying. It was concluded that carbonation has a significant effect on chloride ingress, increasing it.

scholarly journals Volumetric Deformations and Crack Control in Reinforced Concrete Structures

2021 ◽  
Author(s):  
Mahmut Acarcan
Keyword(s):  
Reinforced Concrete ◽  
Crack Width ◽  
Structural Integrity ◽  
Concrete Structures ◽  
Prediction Equation ◽  
Reinforcement Ratio ◽  
Strain History ◽  
Reinforced Concrete Structures ◽  
Limited Information ◽  
Reinforcement Design

Restraint temperature and shrinkage strains are one of the major reasons for cracking of reinforced concrete. Cracking of concrete reduces structural integrity, initiates or accelerates deterioration mechanisms, causes serviceability problems and may raise aesthetical concerns. Particularly for liquid retaining structures, cracks are vital for structural functionality. Measures must be take to prevent or control crack. In most cases, it may not be feasible to prevent crack formation, but crack width can be controlled by providing sufficient amount of reinforcement. Design guides provide limited information on adequate reinforcement design for temperature and shrinkage cracks in reinforced concrete structures. The Finite Element Method(FEM) was used in order to investigate the crack risk, magnitude of crack width, and adequate reinforcement ratio for controlling cracks within the design specifications. In order to find the thermal and shrinkage strains effect during early ages, computer simulations was performed for hardening concrete. Using the computer program ABAQUS/6.4, incremental numerical analysis technique was implemented that provided realistic simulation of stress/strain history. Considering an appropriate value for thermal and shrinkage strains, a parametric study was carried out to estimate the reinforcement ratio for fixed base walls. The crack width was estimated based on the calculated steel stress and the ACI 318-02 crack prediction equation. With consideration of ACI 350-01 specification for allowable crack width, the required amount of reinforcement ratio for various wall dimensions was recommended.

scholarly journals NEW EUROPEAN UNION METHOD FOR THE DESIGN OF REINFORCED CONCRETE STRUCTURES EXPOSED TO FIRE TEMPERATURES

2006 ◽  
Vol 12 (2) ◽  
pp. 108-117 ◽  
Author(s):  
Bronius Jonaitis ◽  
Vytautas Papinigis
Keyword(s):  
Reinforced Concrete ◽  
Concrete Structures ◽  
Fire Spread ◽  
Reinforced Concrete Structures ◽  
Structural System ◽  
Fire Load ◽  
Passive Protection ◽  
Positive Effects ◽  
Protection Systems ◽  
In Fire

The analysis of a method for the design of reinforced concrete structures exposed to fire temperatures is presented in the article. The main essential factors which must be evaluated in the design of structures and their parts to provide their adequate carrying capacity and ability to prevent fire spread are analyzed. In fire design it is necessary to take into account the behaviour of structural system exposed to fire temperatures, the possible effect of heat and positive effects of active and passive protection systems against fire and the consequences of collapse of the structure. The method is intended for buildings, fire load is associated with the building and its use. At the same time thermal and mechanical actions for structures exposed to fire are considered.

Structural Integrity Monitoring of Concrete Structures via Optical Fiber Sensors: Sensor Protection Systems

2003 ◽  
Vol 2 (2) ◽  
pp. 123-135 ◽  
Author(s):  
G. F. Fernando ◽  
A. Hameed ◽  
D. Winter ◽  
J. Tetlow ◽  
J. Leng ◽  
...  
Keyword(s):  
Optical Fiber ◽  
Structural Integrity ◽  
Concrete Structures ◽  
Optical Fiber Sensors ◽  
Integrity Monitoring ◽  
Fiber Sensors ◽  
Protection Systems

scholarly journals Experimental evaluation of coupler behavior for mechanical rebar splices in reinforced concrete structures

2018 ◽  
Vol 11 (6) ◽  
pp. 1326-1353
Author(s):  
V. G. CHIARI ◽  
A. L. MORENO JUNIOR
Keyword(s):  
Performance Evaluation ◽  
Reinforced Concrete ◽  
Structural Integrity ◽  
Test Procedure ◽  
Concrete Structures ◽  
Test Methods ◽  
Reinforced Concrete Structures ◽  
Steel Bars ◽  
Important Solution ◽  
Brazilian Standard

Abstract The use of mechanical splices to connect steel bars is an important solution in many infrastructure projects worldwide. In Brazil, this system is rarely used. The Brazilian standards regarding this subject are old and out of date; particularly with regard to the performance evaluation test methods for these splices in the laboratory. This paper presents and discusses the test procedure proposed in the international standard ISO 15835 [1] in light of the current procedure defined by Brazilian Standard ABNT NBR 8548 [2], applied to types of mechanical splices commonly used in Brazil: taper threaded and bolted couplers. Performance parameters for these mechanical splicing systems related to structural integrity in reinforced concrete structures are evaluated on the basis of the results obtained in these tests. In the end, it is intended that this paper provide support for discussion of design procedures and laboratory performance evaluation of couplers for mechanical splices of steel bars in reinforced concrete structures in future reviews of Brazilian standard ABNT NBR 8548 [2].

scholarly journals Volumetric Deformations and Crack Control in Reinforced Concrete Structures

2021 ◽  
Author(s):  
Mahmut Acarcan
Keyword(s):  
Reinforced Concrete ◽  
Crack Width ◽  
Structural Integrity ◽  
Concrete Structures ◽  
Prediction Equation ◽  
Reinforcement Ratio ◽  
Strain History ◽  
Reinforced Concrete Structures ◽  
Limited Information ◽  
Reinforcement Design

Restraint temperature and shrinkage strains are one of the major reasons for cracking of reinforced concrete. Cracking of concrete reduces structural integrity, initiates or accelerates deterioration mechanisms, causes serviceability problems and may raise aesthetical concerns. Particularly for liquid retaining structures, cracks are vital for structural functionality. Measures must be take to prevent or control crack. In most cases, it may not be feasible to prevent crack formation, but crack width can be controlled by providing sufficient amount of reinforcement. Design guides provide limited information on adequate reinforcement design for temperature and shrinkage cracks in reinforced concrete structures. The Finite Element Method(FEM) was used in order to investigate the crack risk, magnitude of crack width, and adequate reinforcement ratio for controlling cracks within the design specifications. In order to find the thermal and shrinkage strains effect during early ages, computer simulations was performed for hardening concrete. Using the computer program ABAQUS/6.4, incremental numerical analysis technique was implemented that provided realistic simulation of stress/strain history. Considering an appropriate value for thermal and shrinkage strains, a parametric study was carried out to estimate the reinforcement ratio for fixed base walls. The crack width was estimated based on the calculated steel stress and the ACI 318-02 crack prediction equation. With consideration of ACI 350-01 specification for allowable crack width, the required amount of reinforcement ratio for various wall dimensions was recommended.

Design of precast reinforced concrete structures of frame buildings: a new set of rules

2019 ◽  
pp. 4-9 ◽  
Keyword(s):  
Reinforced Concrete ◽  
Concrete Structures ◽  
Reinforced Concrete Structures ◽  
Building Frames ◽  
Fine Grained ◽  
Rigid Frame ◽  
Floor Slabs ◽  
Frame Buildings ◽  
Spatial System ◽  
Precast Elements

Currently, prefabricated reinforced concrete structures are widely used for the construction of buildings of various functional purposes. In this regard, has been developed SP 356.1325800.2017 "Frame Reinforced Concrete Prefabricated Structures of Multi-Storey Buildings. Design Rules", which establishes requirements for the calculation and design of precast reinforced concrete structures of frame buildings of heavy, fine-grained and lightweight structural concrete for buildings with a height of not more than 75 m. The structure of the set of rules consists of eight sections and one annex. The document reviewed covers the design of multi-story framed beam structural systems, the elements of which are connected in a spatial system with rigid (partially compliant) or hinged joints and concreting of the joints between the surfaces of the abutting precast elements. The classification of structural schemes of building frames, which according to the method of accommodation of horizontal loads are divided into bracing, rigid frame bracing and framework, is presented. The list of structural elements, such as foundations, columns, crossbars, ribbed and hollow floor slabs and coatings, stiffness elements and external enclosing structures is given; detailed instructions for their design are provided. The scope of the developed set of rules includes all natural and climatic zones of the Russian Federation, except seismic areas with 7 or more points, as well as permafrost zones.

Sign in / Sign up

Export Citation Format

Share Document