scholarly journals Failure Evolution Law of Reinforced Anchor System under Pullout Load Based on DIC

2020 ◽  
Vol 2020 ◽  
pp. 1-12
Author(s):  
Yue Li ◽  
Chongming Gao ◽  
Qian Li ◽  
Qiqi Wu ◽  
Wenjun Meng
Keyword(s):  
Image Correlation ◽  
Test Model ◽  
Evolution Law ◽  
Anchor System ◽  
Steel Bar ◽  
Force Transfer ◽  
Failure Evolution ◽  
Anchoring System ◽  
Pullout Load ◽  
Pulling Force

To obtain the failure evolution law, a pullout test model of the anchor system is proposed based on the digital image correlation (DIC) measurements. By the study of the displacement field, the strain field, and the force transfer law of the anchor system under the pulling load, the failure law of the anchor system is revealed. The results show that (1) the failure mode and the ultimate bearing capacity of the anchor system are related to the thickness of the anchor agent; (2) in the anchor system, the pulling force is gradually transferred from the loading end to the free end along the steel bar, and the greater the thickness of the anchoring agent, the deeper the transfer range; (3) during the loading, the deformation of the anchoring system is mainly concentrated at the interface between the anchoring agent and the concrete and expands to the depth along the steel bar; and (4) the failure evolution rate of the anchorage system is related to the loading stage. The failure evolution of the anchor system can be divided into the elastic phase, the plastic phase, and the deformation rebound phase.

Experimental Research on Mechanical Behavior of Carbon Fiber Reinforced Concrete Beam

2013 ◽  
Vol 641-642 ◽  
pp. 393-397
Author(s):  
Le Zhou ◽  
Jun Wei Wang ◽  
Hong Tao Liu
Keyword(s):  
Carbon Fiber ◽  
Cross Section ◽  
Brittle Failure ◽  
Concrete Beam ◽  
Concrete Beams ◽  
Reinforced Concrete Beam ◽  
Fiber Reinforced Concrete ◽  
Test Model ◽  
Steel Bar ◽  
Fiber Concrete

Based on the cross-section bending of 5 carbon fiber concrete beams, the mechanism of deflection and strain of carbon fiber concrete beam were studied considering the variation of the length of carbon fiber. The experimental results show that the deflection of destruction increased with the increase of the length of the carbon fiber. The carbon fiber can effectively improve the brittle failure of concrete beam, and the stain of concrete accorded with that steel bar at the same height. According to the existing test model, the theoretical calculating formula of CFRC was proposed.

Study on deformation evolution law of coal under asymmetric loading by digital image correlation

2020 ◽  
Vol 59 (34) ◽  
pp. 10959
Author(s):  
Tao Wang ◽  
Hongbao Zhao ◽  
Lina Ge ◽  
Huan Zhang ◽  
Rui Liu
Keyword(s):  
Digital Image Correlation ◽  
Digital Image ◽  
Image Correlation ◽  
Evolution Law ◽  
Asymmetric Loading

Experimental Study on Anchorage Performance of Chemical Adhesive Steel Bar in Concrete

2014 ◽  
Vol 578-579 ◽  
pp. 331-334
Author(s):  
Li Zhong Shi ◽  
Jian Rong Zhang
Keyword(s):  
Experimental Study ◽  
Stress Distribution ◽  
Strain Distribution ◽  
Failure Modes ◽  
Constitutive Relationship ◽  
Bond Slip ◽  
Steel Bar ◽  
Damage Process ◽  
Pullout Load ◽  
Relationship Of

This paper describes the behavior of adhesive anchor under pullout load. By measuring steel slips and strain distribution under different loads and observing the damage process of the specimen, the failure modes of anchors, mechanism of bonding and bond stress distribution are investigated and discussed. The study laid the foundation for determining the constitutive relationship of bond slip.

scholarly journals Dynamic Response Measurement of Elastic Structures Through Smart Digital Image Correlation Method and Calculation

2021 ◽  
Vol 2083 (4) ◽  
pp. 042016
Author(s):  
Jiawen Wang ◽  
Jingqi Liang ◽  
Rui Wang ◽  
Xiaobin Qi
Keyword(s):  
Digital Image Correlation ◽  
Measurement System ◽  
Digital Image ◽  
Elastic Plate ◽  
Correlation Method ◽  
Test System ◽  
Image Correlation ◽  
High Signal ◽  
Test Model ◽  
Digital Image Correlation Method

Abstract Based on the proper improvement and development of the basic principle of digital image correlation method, a 3D-DIC measurement system is built. Its measurement principle and application process can be divided into four steps: camera calibration, image acquisition, image matching and three-dimensional reconstruction. The measurement system can realize non-contact and full-field measurement and has the advantages of not being affected by the test environment, not imposing additional mass on the test model, and high signal-to-noise ratio of the measured data. Taking the elastic plate model as an example, the accuracy and reliability of the measurement system in the measurement of static and dynamic displacement response are verified by using the measurement results of laser displacement meter as a reference. In addition, the tensile strain of the projectile aluminum alloy tail model and the ground mode of the elastic plate are tested to further verify the practicability of the test system.

scholarly journals Peridynamic Model for the Numerical Simulation of Anchor Bolt Pullout in Concrete

2018 ◽  
Vol 2018 ◽  
pp. 1-10 ◽  
Author(s):  
Jiezhi Lu ◽  
Yaoting Zhang ◽  
Habib Muhammad ◽  
Zhijun Chen
Keyword(s):  
Plain Concrete ◽  
Experimental Investigations ◽  
Anchor Bolt ◽  
Short Range Force ◽  
Peridynamic Model ◽  
Anchoring System ◽  
Pullout Load ◽  
Level Model ◽  
Crack Paths ◽  
Remeshing Algorithm

Predictive simulation of anchor pullout from concrete structures is not only a serious problem in structural mechanics but also very important in structural design safety. In the finite element method (FEM), the crack paths or the points of crack initiation usually need to be assumed in advance. Otherwise, some special crack growth treatment or adaptive remeshing algorithm is normally used. In this paper, an extended peridynamic method was introduced to avoid the difficulties found in FEM, and its application on anchor bolt pullout in plain concrete is studied. In the analysis, the interaction between the anchor bolt and concrete is represented by a modified short-range force and an extended bond-level model for concrete is developed. Numerical analysis results indicate that the peak pullout load obtained and the crack branching of the anchoring system agreed well with the experimental investigations.

Experimental Research on Flexural Mechanical Behavior of Fiber Reinforced Concrete Flexural Members

2013 ◽  
Vol 648 ◽  
pp. 120-124
Author(s):  
Xiao Chu Wang ◽  
Jian Peng Zhang ◽  
Hong Tao Liu
Keyword(s):  
Carbon Fiber ◽  
Concrete Beam ◽  
Concrete Beams ◽  
Fiber Reinforced Concrete ◽  
Experimental Results ◽  
Test Model ◽  
Flexural Members ◽  
Steel Bar ◽  
Fiber Concrete ◽  
Load Calculation

Based on the cross-section bending of 5 carbon fiber concrete beams, the mechanism of deflection and strain of carbon fiber concrete beam were studied considering the variation of the length of carbon fiber and stirrup ratio. The experimental results show that the deflection of destruction increased with the increase of the length of the carbon fiber, and the effect of stirrup ratio on deflection and strain of beams is not obvious. The carbon fiber can effectively improve the brittle failure of concrete beam, and the stain of concrete accorded with that steel bar at the same height. According to the existing test model, the theoretical calculating formula of CFRC was proposed and applied for the cracking load calculation expression of CRFC beams, and theoretical calculated results agree well with experimental results.

scholarly journals Design and Mechanical Properties of a New Clamp-Type Carbon Fiber Materials Tension Anchoring System

2021 ◽  
Vol 2101 (1) ◽  
pp. 012060
Author(s):  
Xianwei Wang ◽  
Bo Liu ◽  
Shengyong Hu ◽  
Longsheng Bao
Keyword(s):  
Mechanical Properties ◽  
Carbon Fiber ◽  
Measurement Data ◽  
Fiber Material ◽  
Element Analysis ◽  
Anchor System ◽  
Carbon Fiber Material ◽  
Inclination Angles ◽  
Anchoring System ◽  
Fiber Materials

Abstract Carbon fiber materials are widely used in bridge reinforcement techniques, while conventional carbon fiber material tensile anchoring equipment produces a large prestressed loss. This paper analyzes the deficiencies of existing tensile anchoring systems at home and abroad, summarizing the cause of prestressed losses, and combining with existing anchoring systems, a new type of clamp type carbon fiber cloth tension anchoring system is proposed. The amount of deformation of the anchoring system is reduced by about 20%, which in turn reduces the system prestress loss caused by the system deformation. The ABAQUS finite element analysis software is used to numerically simulate the thickness of the tension anchor system and the force of the fixture at different inclination angles. Compare the experimental measurement data, under consideration of the mechanical properties of the system, making errors, and installation convenient prerequisites, the mechanical properties of the system are optimal when the thickness of the fixed plate is 30mm and the clamp tilt angle is 5 °.

scholarly journals Experimental Study on Novel Energy-Dissipating Prefabricated Beam-Column Joints

2019 ◽  
Vol 2019 ◽  
pp. 1-17 ◽  
Author(s):  
Qiong Liu ◽  
Shanghong Chen ◽  
Wei Lin ◽  
Fanjin Zeng
Keyword(s):  
Shear Failure ◽  
Structural Integrity ◽  
Plastic Hinge ◽  
High Strength ◽  
Internal Force ◽  
Steel Plates ◽  
Engineering Structures ◽  
Anchor System ◽  
Steel Bar ◽  
New Type

A new dapped-end beam to column connection is designed in this paper. Its assembly connection zone changes from inside the joint to midspan of the beam. The proposed connection can not only provide good structural integrity but also ensure that the plastic hinge moves away from the column edge. The rotational capacity of the plastic hinge determines the internal force redistribution of the joint and the energy dissipation capacity. The high-strength bolts and steel plates are used to realize connection, further enhancing the rotation of the plastic hinge and minimizing the cast-in-place concrete volume. Three full-scale exterior beam to column joints are casted and then subjected to reversal cyclic loading. The finite element (FE) analyses are carried out to compare with experimental results and study the effect of connection position on the structural behaviours. The obtained results show that the plastic hinges of all three specimens are firstly developed to a distance from the column edge, thus revealing that this kind of joint can achieve beam hinge mechanism and prevent joint shear failure. And the connection position is the most disadvantaged when coinciding with the plastic hinge zone, which would result in the excessive deformation and the early failure of the steel bar anchor system. The new type of joint shows good seismic performance during earthquake if the connection can be properly designed, and thus this kind of structural form can be applied to actual engineering structures in seismic regions.

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