1. Experimental Study of Friction Resistance between Steel and ...
Feb 19, 2020 · In design, slip between concrete slab and steel plate means the failure of the high-strength frictional bolt, so the loading ought to be ...
Prefabrication of composites beam reduces the construction time and makes them easily to be assembled, deconstructed, and partially repaired. The use of high-strength frictional bolt shear connectors can greatly enhance the sustainability of infrastructure. However, researches about the concrete-steel friction behavior are very limited. To provide a contribution to this area, 21 tests were conducted to measure the friction coefficient and slip stiffness with different concrete strength, steel strength, and surface treatment of steel. An effective finite element model was developed to investigate the ultimate bearing capacity and load-slip characteristics of bolt shear connection. The accuracy of the proposed finite element model is validated by the tests in this paper. The results demonstrate a positive correlation between concrete strength and friction coefficient and better performance of shot-blasted steel. It is also proved that high-strength frictional bolt has a 30% lower bearing capacity but better strength reserve and antiuplifting than the headed stud.
2. Bond-Slip Monitoring of Concrete Structures Using Smart Sensors—A ...
Mar 11, 2019 · With the occurrence of bond-slip, a relative displacement happened between the steel plate and the concrete, which negatively impacts the wave ...
Concrete structures with various reinforcements, such as steel bars, composite material tendons, and recently steel plates, are commonly used in civil infrastructures. When an external force overcomes the strength of the bond between the reinforcement ...
3. Modeling Uniaxial Bond Stress–Slip Behavior of Reinforcing Bars ... - NCBI
Feb 7, 2021 · This paper aims to study the uniaxial bond stress–slip characteristics of reinforcing bars embedded in concrete with different strengths.
This paper aims to study the uniaxial bond stress–slip characteristics of reinforcing bars embedded in concrete with different strengths. Tests were conducted on tension–pull specimens that had a cross-sectional dimension with a reinforcing ...
4. Numerical Study of Bond Slip between Section Steel and Recycled ... - MDPI
In this paper, the bond deterioration mechanism of recycled aggregate concrete (RAC) with a full replacement ratio was studied through experimental and ...
In this paper, the bond deterioration mechanism of recycled aggregate concrete (RAC) with a full replacement ratio was studied through experimental and numerical simulations. To study the bond behavior and the bond slip between section steel and RAC, nine push-out specimens were designed using the control variable method. The effects of the concrete strength, the embedded length, the cover thickness, and the lateral stirrup ratio on the bond behavior and the bond slip were investigated in detail. The loading process and failure mode of the specimens were observed, and the test curves of the loading end and free end of the specimens were analyzed. Based on the experiment, the finite element method (FEM) was used to simulate the specimens, and the simulation results were analyzed by comparing the experiment data. The analysis of the results showed that the developed model is capable of representing the characteristic bond strength value between section steel and RAC with sufficient accuracy, and the main differences of bond slip between the simulation and the test results are the slippage at the limit state and the moment at which the free end starts to slip.
5. The Phenomenon of Cracking in Cement Concretes and Reinforced ...
It is noted that the durability of concrete structures is seriously endangered in the first stages of curing of concrete because of the possibility of cracks, ...
Cracks and cavities belong to two basic forms of damage to the concrete structure, which may reduce the load-bearing capacity and tightness of the structure and lead to failures and catastrophes in construction structures. Excessive and uncontrolled cracking of the structural element may cause both corrosion and weakening of the adhesion of the reinforcement present in it. Moreover, cracking in the structure negatively affects its aesthetics and in extreme cases may cause discomfort to people staying in such a building. Therefore, the following article provides an in-depth review of issues related to the formation and development of damage and cracking in the structure of concrete composites. It focuses on the causes of crack initiation and characterizes their basic types. An overview of the most commonly used methods for detecting and analyzing the shape of microcracks and diagnosing the trajectory of their propagation is also presented. The types of cracks occurring in concrete composites can be divided according to eight specific criteria. In reinforced concrete elements, macrocracks depend on the type of prevailing loads, whereas microcracks are correlated with their specific case. The analyses conducted show that microcracks are usually rectilinear in shape in tensioned elements; in shear elements there are wing microcracks with straight wings; and torsional stresses cause changes in wing microcrack morphology in that the tips of the wings are twisted. It should be noted that the subject matter of microcracks and cracks in concrete and structures made of this material is important in many respects as it concerns, in a holistic approach, the durability of buildings, the safety of people staying in the buildings, and costs related to possible repairs to damaged structural elements. Therefore, this problem should be further investigated in the field of evaluation of the cracking and fracture processes, both in concrete composites and reinforced concrete structures.
6. [PDF] Investigation of bond slip between concrete and steel reinforcement ...
Investigation of bond slip between concrete and steel reinforcement under dynamic loading conditions. Page 1. Louisiana State University.
7. [PDF] EFFECTS OF BOND DETERIORATION ON ...
Aug 19, 1983 · account of shear deformations and bond slip between steel and concrete. ... Suppose now that the increments of stress and slip are known at node i ...
8. [PDF] 1. Report No. - Ferguson Structural Engineering Laboratory
the concrete and will try to prevent slippage of the strands upon loading. This phenomenon is also known as the wedge action. When the pretensioned member ...
9. [PDF] CONTINUOUSLY REINFORCED CONCRETE PAVEMENT MANUAL ...
Aug 1, 2016 · and an increase in concrete restraint. Keeping the steel at acceptable stress levels prevents fracture of the steel as well as excessive ...
10. Purchase and price of types of steel rebar in construction - Arad Branding
These bars provide a strong bond with the concrete and prevent slipping. a bar of carbon steel Due to the color that carbon has, carbon steel bar—also known as ...
Construction is an industry that consumes steel products and steel rebar extensively in our expanding world of industries. There are different types of steel product
11. Tacoma Narrows Bridge history - Bridge - Lessons from failure - wsdot
Their only value now was as scrap metal. Deck-floor system. Not surprisingly, the concrete and steel of the center span that now lay on the bottom of the ...
How Galloping Gertie's collapse left us a lasting design legacy.
12. [PDF] Effect of Initial Strand Slip on the Strength of Hollow-Core Slabs
of the bond quality of the concrete. This slip is therefore directly related ... (3) and (5). For this latter case, assuming a linear variation of steel stress, ...
13. Numerical approach of the steel-concrete bond behavior using ...
The bond stress is the phenomena responsible by the load transfer from the concrete to the steel. The bond, when efficiently developed, enables these two ...
ABSTRACT This paper deals with the analysis of monotonic loading behavior in pull-out tests. The...
14. The Effects of Degradation Phenomena of the Steel-Concrete ...
Concrete cracking is characterized by the appearance of micro-cracks that can appear in the material as soon as it is installed (consequence of the phenomenon ...
Reinforced concrete (RC) constructions are the innovation of sustainable constructions replacing masonry constructions. Despite this, the use of concrete and steel to improve the performance of structural members in service is a recurring problem due to the immediate or overtime appearance of cracks. The objective of this work was therefore to assess the damage phenomena of the steel-concrete interface in order to assess the performance of an RC structure. Samples of approximately 30 cm of reinforcement attacked by rust were taken from broken reinforced concrete columns and beams in order to determine the impact of corrosion on high adhesion steel (HA) and therefore on its ability to resist. The experimental results have shown that the corrosion degradation rates of reinforcing bars of different diameters increase as the diameter of the reinforcing bars decreases: 5% for HA12; 23.75% for HA8 and 50% for HA6. Using the approach proposed by Mangat and Elgalf on the bearing capacity as a function of the progress of the corrosion phenomenon, these rates made it possible to assess the new fracture limits of corroded HA steels. For HA6 respectively HA8 and HA12, their initial limit resistances will decrease by 4/4, 3/4 and 1/4. Based on the results of this study and in order to guarantee their durability, an RC structure can be dimensioned by taking into account the effects of reinforcement corrosion.
15. [PDF] Discrete Modeling of Sliding Shear Failure in Contacts Between RC ...
After the concrete cracking, the progressive bond deterioration can result in bond-slip between the steel- bar and surrounding concrete, as mentioned before.
16. Steel to Concrete Bond Transferring in CFST Columns connected ... - CORE
As example, the slip between steel and concrete in composite columns carried by bending loads, reached in recorded tests at ultimate loads [3], is given in ...
