Development Length Comparison between Australian Codes and Chinese Code on 500MPa Steel Bars

2014 ◽  
Vol 584-586 ◽  
pp. 889-893
Author(s):  
Jing Wen Su ◽  
Hai Tao Li ◽  
Li Xin Liu ◽  
A.J. Deeks ◽  
Fan Wu ◽  
...  
Keyword(s):  
Experimental Investigation ◽  
Test Data ◽  
Test Results ◽  
Development Length ◽  
Anchorage Length ◽  
Steel Bar ◽  
Eurocode 2 ◽  
Steel Bars ◽  
Code Provisions ◽  
Good Agreement

This paper presents development length comparison between Chinese and Australian codes study on HRB500 steel bars in concrete. After introducing the existing code provisions about the anchorage length and experimental investigation of tensile HRB500 steel bars, the calculation approaches in different codes are compared with the test data. Additionally, the development length of tensile HRB500 reinforcement bars in AS3600-2001, Proposed Revision of AS3600, GB50010-2010 and the calculation equation proposed from test results are compared with each other in beams and slabs. It is proved that AS3600-2001 is inconsistent with other standards and the tests results and needs to be revised, while the Proposed Revision of AS3600 provided a good agreement with the test data and brings the code into line with other international codes, particularly Eurocode 2. Moreover, the Proposed Revision of AS3600 is a significant improvement on the method in AS3600-2001. The anchorage length formula in GB50010-2010 can still be used for designing HRB500 steel bar.

Axial Strength of Concrete-Filled Square Steel Tubular Columns Reinforced by Inner Circular Steel Tube

2010 ◽  
Vol 163-167 ◽  
pp. 4542-4545 ◽  
Author(s):  
Xin Zhong Li ◽  
Xue Ying Wei ◽  
Jun Hai Zhao
Keyword(s):  
Experimental Investigation ◽  
Steel Tube ◽  
Experimental Results ◽  
Test Results ◽  
Strength Theory ◽  
Unified Strength Theory ◽  
Axial Strength ◽  
Tubular Columns ◽  
Circular Steel Tube ◽  
Good Agreement

This paper presents the theoretical and experimental results of concrete-filled steel tube columns subjected to axially compression. A total of 6 specimens with outer square sections reinforced by inner cicular steel tube were constructed for experimental investigation. The ultimate strengths of the columns from tests were obtained. The theoretical strengths of the columns were also investigated based on unified strength theory, and compared with the test results. Good agreement can be observed from the comparison.

Research on the Short-Time Deflection of Concrete Beams Reinforced with 500MPa Steel Bars

2012 ◽  
Vol 166-169 ◽  
pp. 1592-1597
Author(s):  
Zhi Hua Li ◽  
Xiao Zu Su
Keyword(s):  
Test Data ◽  
Static Loading ◽  
Concrete Beams ◽  
Experimental Results ◽  
Test Results ◽  
Flexural Members ◽  
Strength Concrete ◽  
Conventional Steel ◽  
Steel Bars ◽  
Short Time

Fourteen concrete beams reinforced with 500MPa longitudinal steel bars were tested under two-point symmetrical concentrated static loading to investigate their deflection characteristics. And the formula for short-time stiffness specified in the code for design of concrete (GB50010-2010)were evaluated using the experimental results and available test data of 74concrete beams reinforced with 500MPa longitudinal steel bars. The results show that the deflection behavior of beams with 500MPa longitudinal steel bars is essentially similar to that of beams reinforced with conventional steel reinforcements. It is also shown that the formula for short-time stiffness under service loads specified in GB50010-2010 is applicable for flexural members reinforced with 500MPa longitudinal steel bars. Comparisons of the test results with the calculated values for the short-time deflection according to GB50010-2010 show that the code method can be used to estimate the short-time deflection for beams reinforced with 500MPa longitudinal steel bars, but that the method is somewhat less accurate for beams with light reinforcement ratio and low-strength concrete.

The Analysis of the Reliability and Design for Mechanical Anchorage of HRB500 Steel Bars

2011 ◽  
Vol 94-96 ◽  
pp. 970-974
Author(s):  
Xian Rong ◽  
Peng Cheng Liu ◽  
Xue Li
Keyword(s):  
Concrete Strength ◽  
Concrete Cover ◽  
Statistical Regression ◽  
Analysis Method ◽  
Anchorage Length ◽  
Pull Out ◽  
Steel Bar ◽  
Steel Bars ◽  
Mechanical Anchoring ◽  
Cover Thickness

The factors on mechanical anchoring performance of HRB500 steel bars, such as concrete strength, concrete cover thickness, diameter of steel bar, anchorage length of steel bar and transverse reinforcement ratio, were studied based on pull-out tests of 45 specimens. And the formula of mechanical anchoring bond strength for HRB500 steel bars was concluded by statistical regression analysis method. Through the reliability analysis, the mechanical anchoring length of design value and the table of conversion ratio between mechanical and direct anchoring length of HRB500 steel bars have been proposed. So it could be used as a basis for practical projects. The results indicate that the mechanical anchorage length of HRB500 steel bars can be still designed with the formula proposed in GB 50010-2002 “Code for design of concrete structures”.

Magnetoelastic Measurements of Steel Stress under Uniaxial Loading

2006 ◽  
Vol 321-323 ◽  
pp. 377-380 ◽  
Author(s):  
Hong C. Rhim ◽  
Bo Hwan Oh ◽  
Hyo Seon Park
Keyword(s):  
Reinforced Concrete ◽  
Concrete Structures ◽  
Uniaxial Loading ◽  
Magnetic Response ◽  
Reinforced Concrete Structures ◽  
Test Results ◽  
Traditional Technique ◽  
Steel Bar ◽  
Steel Bars ◽  
Different Diameters

An attempt has been made to measure existing steel stress using magnetoelasticity. A device has been developed and used for the measurement of magnetism in response to the deformation of a steel bar. The proposed technique can be used for the assessment of existing reinforced concrete structures by the measurements of steel stress embedded inside concrete. A traditional technique requires to break the existing steel bar to measure existing strain. However, the proposed technique is developed to measure the stress without damaging the steel bar. A successful application of magnetoelasticity depends on the establishment of relationship between elastic and magnetic response due to loading. To investigate the correlation between the two, steel bars are loaded in tension under uniaxial loading while the magnetic reading is recorded. Based on the test results, equations are suggested to predict stress for steel bars with different diameters.

Research on Shearing Performance of RC Beams Strengthened with Steel Wire-Polymer Mortar

2012 ◽  
Vol 166-169 ◽  
pp. 1702-1708 ◽  
Author(s):  
Chi Yun Zhao ◽  
Shi Min Huang ◽  
Qiu Lai Yao ◽  
Ya Jing Chen
Keyword(s):  
Steel Wire ◽  
Composite Model ◽  
Rc Beams ◽  
Test Results ◽  
Ultimate Capacity ◽  
Ansys Analysis ◽  
Steel Bars ◽  
Polymer Mortar ◽  
Analysis Models ◽  
Good Agreement

This paper presents the results of the experimental investigation on the shearing performance of beams strengthened with steel wire-polymer mortar. The numerical results by finite element method are compared with experimental results. A total of three rectangular doubly RC beams were constructed, strengthened and tested to failure. A new convenient method to measure elongation of steel wire was proposed. Two models, named separated model and composite model respectively in software ANSYS, are used to analyze the beams. In separated model, strains of longitudinal steel bars and stirrups are in good agreement with the test results, and strains of longitudinal steel bars by composite model are also in good agreement with the test results, while stirrups strains are not, but both of steel wire deformations obtained by ANSYS analysis models are slightly different with tests results. Strengthened beams increased ultimate capacity, delayed the crack occurs and crack development. More closer and disorder cracks distribute in the strengthened beams than the unstrengthened beam. Cracks in beams by ANSYS analysis models, comparing with test results, are not very obvious.

scholarly journals Basic Mechanical Properties of Duplex Stainless Steel Bars and Experimental Study of Bonding between Duplex Stainless Steel Bars and Concrete

Materials ◽  
2021 ◽  
Vol 14 (11) ◽  
pp. 2995
Author(s):  
Qingfu Li ◽  
Yunqi Cui ◽  
Jinwei Wang
Keyword(s):  
Mechanical Properties ◽  
Stainless Steel ◽  
Duplex Stainless Steel ◽  
Concrete Strength ◽  
Concrete Cover ◽  
Bond Stress ◽  
Reinforcing Steel ◽  
Anchorage Length ◽  
Steel Bar ◽  
Steel Bars

In recent years, as a result of the large-scale use of stainless steel bars in production and life, people’s demand for stainless steel bars has increased. However, existing research information on stainless steel bars is scant, especially the lack of research on the mechanical properties of duplex stainless steel bars and the bonding properties of duplex stainless steel bars to concrete. Therefore, this paper selects 177 duplex stainless steel bars with different diameters for room temperature tensile test, and then uses mathematical methods to provide suggestions for the values of their mechanical properties. The test results show that the duplex stainless steel bar has a relatively high tensile strength of 739 MPa, no significant yield phase, and a relatively low modulus of elasticity of 1.43 × 105 MPa. In addition, 33 specimens were designed to study the bonding properties of duplex stainless steel bars to concrete. In this paper, the effects of concrete strength, duplex stainless steel reinforcement diameter, the ratio of concrete cover to reinforcing steel diameter, and relative anchorage length on the bond stress were investigated, and a regression model was established based on the experimental results. The results show that, with the concrete strength concrete strength from C25 to C40, the compressive strength of concrete increased by 56.1%, the bond stress increased by 27%; the relative anchorage length has been increased from 3 to 6, the relative anchorage length has doubled, and the bond stress has increased by 13%; and, the ratio of concrete cover to reinforcing steel diameter increased to a certain range on the bond stress has no significant effect and duplex stainless steel reinforcement diameter has little effect on the bond stress. The ratio of concrete cover to reinforcing steel diameter from 3.3 to 4.5 and the bond stress increased by 24.7%. A ratio of concrete cover to reinforcing steel diameter greater than 4.5 has no significant effect on the bond stress, with the average bond stress value of 20.1 MPa. The duplex stainless steel bar diameter has little effect on the bond stress for the diameters of 12 mm, 16 mm, 25 mm duplex stainless steel bar, and their average bond stress is 19.9 MPa.

Bond position function between deformed steel bars and early-age cementitious grout

2021 ◽  
pp. 136943322110157
Author(s):  
Gang Peng ◽  
Ditao Niu ◽  
Xiaopeng Hu ◽  
Xiao Wu ◽  
Yong Zhang
Keyword(s):  
Ultimate Load ◽  
Tensile Load ◽  
Stress Transfer ◽  
Bond Stress ◽  
Load Testing ◽  
Anchorage Length ◽  
Steel Bar ◽  
Steel Bars ◽  
Two Parameters ◽  
Cover Thickness

Pullout tests for the deformed steel bars in early-aged cementitious grout by considering the variables of testing ages, cover thicknesses, and diameters of steel bar were conducted, and the local bond stress–slip relationship at different positions of the anchorage length of steel bar was studied. Results indicated that, with the increase of testing age, the load-slip curves exhibited a higher ultimate load and had steeper ascending and descending branches; however, the slippage at the ultimate load exhibited a decreasing trend. Moreover, with the increase of cover thickness and diameter of steel bar, the ultimate load of pullout specimens increased obviously, while the corresponding slips generally had no obvious correlations. According to an analysis of the measured rebar strain, the distributions of the steel stress and bond stress as well as the relative slip along the embedded length were obtained under different external loads. Steel stress transfer and bond stress distribution parameters were introduced to characterize the nonuniformity of the distributions of the steel stress and bond stress along the steel bar, and the effects of the testing age, cover thickness, and diameter of steel bar on these two parameters were analyzed. Results showed that the both of these two parameters increased with the increasing tensile load, testing age, and cover thickness and with the decreasing diameter of steel bar. Thereafter, the local bond stress-slip relationships along the anchorage length and position functions reflecting the variations of these relationships were proposed.

Analytical and Experimental Investigation of Magnetic Support Systems. Part II: Experimental Investigation

1982 ◽  
Vol 104 (3) ◽  
pp. 429-437 ◽  
Author(s):  
P. R. Albrecht ◽  
Jed Walowit ◽  
Oscar Pinkus
Keyword(s):  
Experimental Investigation ◽  
Companion Paper ◽  
Test Results ◽  
Test Program ◽  
Present Test ◽  
Experimental Apparatus ◽  
Magnetic Surfaces ◽  
High Degree ◽  
Analytical Expressions ◽  
Good Agreement

An experimental apparatus was developed for measuring forces and fluxes in the gap between magnetic surfaces. A test program, conducted for both aligned and misaligned teeth, showed very good agreement between the analytical expressions, developed in a companion paper and the present test results. This agreement was found to prevail even at relatively high flux levels and a high degree of misalignment.

scholarly journals Experimental Investigation on Punching Behavior of Thick Reinforced Concrete Slabs

2013 ◽  
Vol 59 (2) ◽  
pp. 157-174 ◽  
Author(s):  
T. Urban ◽  
M. Gołdyn ◽  
J. Krakowski ◽  
Ł. Krawczyk
Keyword(s):  
Experimental Investigation ◽  
Reinforced Concrete ◽  
Experimental Test ◽  
Concrete Slabs ◽  
Shear Stresses ◽  
Test Results ◽  
Reinforced Concrete Slabs ◽  
Eurocode 2

Abstract The results of experimental test of nine thickset reinforced concrete slabs in punching are presented in the this paper. The aim of the tests was verification of the Eurocode EC 2 procedure, by which the ultimate shear stresses vRd,c depend on the slenderness of the slab. Besides of the performed tests results, the analysis of the foreign investigation of the fundaments is also included. The test results, as well as other tests, show the correctness of the function assumed in Eurocode 2, which gives correlation between ultimate stresses vRd,c and shear slenderness.

scholarly journals Bond–Slip Law Between Steel Bar and Different Cement-Based Materials Considering Anchorage Position Function

2021 ◽  
Vol 8 ◽  
Author(s):  
Jie Xiao ◽  
Xiang Long ◽  
Ming Ye ◽  
Haibo Jiang ◽  
Lingfei Liu ◽  
...  
Keyword(s):  
Limit State ◽  
Critical Limit ◽  
Anchorage Length ◽  
Relative Slip ◽  
Bond Slip ◽  
Bond Performance ◽  
Steel Bar ◽  
Steel Bars ◽  
Cement Based Materials ◽  
Measured Strain

The bond performance between steel bar and cement-based materials was the prerequisite for the two materials to work together, and previous studies showed that the bond behavior of the steel bars and cement-based materials will vary with the kinds of cement-based materials. For this reason, this paper adopted 12 direct pullout test specimens including three types of concrete and two types of steel bars. The strain of the steel bar at six measuring points was measured with a strain gauge. Based on the measured strain and free end slip of the steel bars, the distribution of steel stress, bond stress, and relative slip and the bond slip relation along the anchorage length were obtained and analyzed for different concrete and different steel bars. Based on these test results of steel strain and relative slip at six measuring points, the anchorage position function could be established in consideration of anchorage position, which was conducive to the establishment of an accurate bond–slip relationship. In addition, the anchorage length of the steel bar in Engineered Cementitious Composites (ECC) calculated from the equilibrium equation of critical limit state is only half of the anchorage length calculated in the current Code for Design of Concrete Structures (GB 50010-2010) in China. It is suggested to establish the critical anchorage length formula suitable for ECC in future studies.

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