Structural Performance of Exterior Beam-Column Joints with Large Diameter Headed Bars

2017 ◽  
Vol 754 ◽  
pp. 337-340
Author(s):  
Hyung Suk Jung ◽  
Hyun Ki Choi ◽  
Chang Sik Choi ◽  
Joo Hong Chung
Keyword(s):  
Reinforced Concrete ◽  
Large Diameter ◽  
Structural Performance ◽  
Transverse Reinforcement ◽  
Test Results ◽  
Reinforced Concrete Structure ◽  
Current Design ◽  
Cover Thickness ◽  
Concrete Placement ◽  
Better Than

Generally, a conventional standard hook is used for the reinforcement's anchorage. However, this results in steel congestion, and it makes fabrication and construction difficult. Using a headed bar offers a potential solution for these problems and may also ease fabrication, construction and concrete placement. But, in current design code of the headed bar, it had limitation about the yield strength and the diameter of rebar etc. It hard to use the large diameter headed bar in the reinforced concrete structure. This paper presents the cyclic responses of four reinforced concrete exterior beam-column joints, which are anchored with large diameter headed bars or hooked bars. To evaluate the anchorage capacity of large diameter headed bars, specimen variables were set with anchorage detail, side cover thickness of concrete, and transverse reinforcement. Also, structural performance of beam-column joints is evaluated and compared with each other. The behavior of joints with headed bars are as good as, or better than those companion joints with 90-degree hooked bars. Test results show that the large diameter headed bar has enough anchorage capacity in exterior beam-column joints. Test results show side cover of concrete improved the anchorage capacity of the bars and transverse reinforcement enhanced the anchorage capacity and ductility of joints.

scholarly journals Elongation and load deflection characteristics of reinforced concrete members containing plastic hinges

1993 ◽  
Vol 26 (1) ◽  
pp. 28-41 ◽  
Author(s):  
R. C. Fenwick ◽  
L. M. Megget
Keyword(s):  
Reinforced Concrete ◽  
Plastic Hinge ◽  
Major Influence ◽  
Test Results ◽  
Design Practice ◽  
Plastic Hinges ◽  
Concrete Members ◽  
Different Types ◽  
Current Design ◽  
Hinge Zone

In regions, described as plastic hinge zones, in beams and columns, tensile yielding of the reinforcement through flexural action can occur in severe earthquakes. Where the beams and columns are lightly loaded, axially, member elongation can occur. Test results show that axial extensions of the order of several percent of the member depth may be expected. This deformation, which is ignored in current design practice, can have a major influence on the distribution of forces in a structure and its ability to survive without collapse. This paper describes the way in which elongation develops in plastic hinge zones together with the form of load deflection characteristics associated with the development of different types of plastic hinge zone.

scholarly journals The Mechanical Properties of Centrifuged Concrete in Reinforced Concrete Structures

2020 ◽  
Vol 10 (10) ◽  
pp. 3570
Author(s):  
Romualdas Kliukas ◽  
Ona Lukoševičienė ◽  
Arūnas Jaras ◽  
Bronius Jonaitis
Keyword(s):  
Mechanical Properties ◽  
Reinforced Concrete ◽  
Concrete Strength ◽  
Concrete Structures ◽  
High Strength ◽  
Reinforcement Ratio ◽  
Transverse Reinforcement ◽  
Reinforced Concrete Structures ◽  
Test Results ◽  
Moduli Of Elasticity

This article explores the influence of transverse reinforcement (spiral) and high-strength longitudinal reinforcements on the physical-mechanical properties of centrifuged annular cross-section elements of concrete. The test results of almost 200 reinforced, and over 100 control elements are summarizing in this article. The longitudinal reinforcement ratio of samples produced in the laboratory and factory varied from 1.0% to 6.0%; the transverse reinforcement ratio varied from 0.25% to 1.25%; the pitch of spirals varied from 100 mm to 40 mm and the concrete strength varied from 25 MPa to 60 MPa. Experimental relationships of coefficients for concrete strength, moduli of elasticity and limits of the longitudinal strain of centrifuged concrete in reinforced concrete structures in short-term concentrically compression were proposed.

The Experimental Study on Bearing Capacity of Reinforced Concrete Structure with Different Reinforce Methods

2014 ◽  
Vol 936 ◽  
pp. 1438-1441
Author(s):  
Qing Yi Liu ◽  
Xiao Mei Liu
Keyword(s):  
Experimental Study ◽  
Reinforced Concrete ◽  
Bearing Capacity ◽  
Steel Plate ◽  
Concrete Beams ◽  
Reinforced Concrete Beams ◽  
Rc Beams ◽  
Test Results ◽  
Reinforced Concrete Structure ◽  
Fiber Sheet

Three reinforcement materials with steel plate, epoxies resin sheet, and glass fiber sheet adhering to failed reinforced concrete beams (RC beams) were used to improve the bearing capacity of Reinforced Concrete beams in the paper. The test results shows all the three materials were proved satisfied with bearing capacity increasing request. Strengthening effects with steel plate and epoxies resin sheet were more obvious.

The Effect of Insufficient Cover Thickness on Structural Performance of Reinforced Concrete Buildings

2021 ◽  
pp. 262-277
Author(s):  
Ercan Işık ◽  
Ehsan Harirchian ◽  
Hüseyin Bilgin ◽  
Berfin Kaya ◽  
İbrahim Baran Karaşin
Keyword(s):  
Reinforced Concrete ◽  
Structural Performance ◽  
Reinforced Concrete Buildings ◽  
Concrete Buildings ◽  
Cover Thickness

Exposure Test of FRP-Reinforced Concrete Structure in Temperate Marine Tide Zone

2012 ◽  
Vol 166-169 ◽  
pp. 538-542
Author(s):  
Ming Jin Chu ◽  
Zhi Juan Sun ◽  
Hui Chen Cui ◽  
Ke Zhang
Keyword(s):  
Reinforced Concrete ◽  
Concrete Structure ◽  
Chloride Ion ◽  
Test Results ◽  
Reinforced Concrete Structure ◽  
Freezing And Thawing ◽  
Concrete Member ◽  
Exposure Test ◽  
Reinforced Concrete Member ◽  
Marine Zone

Through exposure test of FRP-reinforced concrete member in littoral test area of temperate marine zone, the durability and constructional measures of FRP-reinforced concrete structure are investigated. The test results show that FRP shell on the surface of FRP-reinforced concrete member is effective in avoiding wave flush, freezing and thawing damage, preventing chloride ion corrosion and improving durability. On the other hand, reliable measures should be taken to protect concrete structures with no FRP shell on the surface. Based on above, the provided reference for evaluation durability of FRP-reinforced concrete structure, and proper constructional measures for FRP-reinforced concrete structure are presented.

scholarly journals Experimental analysis of the concrete contribution to shear strength beams without shear reinforcement

2017 ◽  
Vol 10 (1) ◽  
pp. 160-172
Author(s):  
M. S. Samora ◽  
A. C. DOS Santos ◽  
L. M. Trautwein ◽  
M. G. Marques
Keyword(s):  
Shear Strength ◽  
Reinforced Concrete ◽  
Resistance Mechanisms ◽  
Experimental Program ◽  
Transverse Reinforcement ◽  
Longitudinal Reinforcement ◽  
Reinforced Concrete Structure ◽  
Empirical Formulas ◽  
Limit States ◽  
Domain 3

Abstract There are many theories and empirical formulas for estimating the shear strength of reinforced concrete structures without transverse reinforcement. The security factor of any reinforced concrete structure, against a possible collapse, is that it does not depend on the tensile strength of the concrete and the formation of any collapse is ductile, thus giving advance warning. The cracking from tensile stress can cause breakage of the concrete and should be avoided at all cost, with the intent that any such breakage does not incur any type of failure within the structure. In the present research study, experiments were performed in order to analyze the complementary mechanisms of the shear strength of lattice beams of reinforced concrete frames without transverse reinforcement. The experimental program entails the testing of eight frames that were subjected to a simple bending process. Two concrete resistance classes for analyzing compressive strength were considered on the construction of frames, 20 MPa and 40 MPa. To resist the bending stresses, the beams of the frames are designed in domain 3 of the ultimate limit states. Different rates and diameters of longitudinal reinforcement were used, 1.32% and 1.55% with 12.5 mm diameter and 16.0 mm in longitudinal tensile reinforcement. From the obtained results, an analysis was made of the criteria already proposed for defining the norms pertinent to the portion of relevant contribution for the shear resistance mechanisms of concrete without the use of transverse reinforcement and the influence of the concrete resistance and longitudinal reinforcement rates established in the experimental numerical results.

Performance of Skew Reinforcing in Inverted-T Bridge Caps

2018 ◽  
Vol 2672 (41) ◽  
pp. 65-74 ◽  
Author(s):  
Satya Sapath Roy ◽  
Jamshaid Sawab ◽  
Tianmin Zhou ◽  
Y. L. Mo ◽  
Thomas T. C. Hsu
Keyword(s):  
Traditional Method ◽  
Structural Performance ◽  
Transverse Reinforcement ◽  
Test Results ◽  
Physical Test ◽  
Construction Period ◽  
Traditional Arrangement

Inverted-T bridge caps (ITBCs) have been widely used in most bridges in Texas in recent years. In some typical cases, the bridge caps are skew when two roads are not aligned in a perpendicular manner. The traditional method of flaring the transverse reinforcement out in skew ITBCs introduces significant complexity in design and during construction. An alternative is to provide skew reinforcing which will substantially reduce the design complexities and construction period. In this paper, three ITBC specimens were subjected to shear action to evaluate and compare the performance of ITBCs with traditional reinforcing with those with skew reinforcing. The three specimens include 0-degree skew, 30-degree skew with traditional reinforcing, and 30-degree skew with skew reinforcing, worthy of verification and quantification as demonstrated in this paper. The physical test results show that the skew reinforcement arrangement does not weaken the bridge cap’s capacity, and the structural performance remains almost the same as that of the traditional arrangement. In addition, the serviceability performance of skew reinforcements is better as compared with traditional reinforcements.

scholarly journals Diagnostics of Concrete and Steel in Elements of an Historic Reinforced Concrete Structure

Materials ◽  
2021 ◽  
Vol 14 (2) ◽  
pp. 306
Author(s):  
Paweł Tworzewski ◽  
Wioletta Raczkiewicz ◽  
Przemysław Czapik ◽  
Justyna Tworzewska
Keyword(s):  
Reinforced Concrete ◽  
Detection System ◽  
Thickness Distribution ◽  
Pulse Method ◽  
Test Methods ◽  
Concrete Cover ◽  
Reinforced Concrete Structure ◽  
Corrosion Risk ◽  
Cover Thickness ◽  
Non Destructive

Existing buildings, especially historical buildings, require periodic or situational diagnostic tests. If a building is in use, advanced non-destructive or semi-destructive methods should be used. In the diagnosis of reinforced concrete structures, tests allowing to assess the condition of the reinforcement and concrete cover are particularly important. The article presents non-destructive and semi-destructive research methods that are used for such tests, as well as the results of tests performed for selected elements of a historic water tower structure. The assessment of the corrosion risk of the reinforcement was carried out with the use of a semi-destructive galvanostatic pulse method. The protective properties of the concrete cover were checked by the carbonation test and the phase analysis of the concrete. X-ray diffractometry and thermal analysis methods were used for this. In order to determine the position of the reinforcement and to estimate the concrete cover thickness distribution, a ferromagnetic detection system was used. The comprehensive application of several test methods allowed mutual verification of the results and the drawing of reliable conclusions. The results indicated a very poor state of the reinforcement, loss in the depth of cover and sulphate corrosion.

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