Bond performance between SFCBs and grouted sleeves for precast concrete structures

2021 ◽  
pp. 136943322110015
Author(s):  
Yunlou Sun ◽  
Zeyang Sun ◽  
Liuzhen Yao ◽  
Yang Wei ◽  
Gang Wu
Keyword(s):  
Concrete Structure ◽  
Failure Modes ◽  
Precast Concrete ◽  
Concrete Structures ◽  
Bond Slip ◽  
Analysis And Design ◽  
Bond Performance ◽  
Steel Bar ◽  
Critical Issues ◽  
Hybrid Reinforcement

A precast concrete structure reinforced by steel-fiber-reinforced polymer (FRP) composite bars (SFCBs) shows good durability and controllable post-yield stiffness, which makes this kind of structure suitable for marine infrastructure. The connection technology is one of the critical issues of a precast concrete structure with hybrid reinforcement. This paper presents an experimental study on the bond-slip testing (27 pullout specimens) of composite bars connected by a grouted deformed pipe splice (GDPS) connector with different bond lengths. The reinforcement included SFCBs and pure FRP bars. The test results showed that the failure modes could be classified into three categories: rebar pullout before or after the inner steel bar yielded, rupture of the FRP wrapped on the SFCB, and mixed failure of bar pullout with a partial fiber fracture. The average bond strength of the ordinary steel bar was approximately 146.8% that of the SFCB connector with the same anchored length. When the anchored length of the SFCB specimen was 15 d ( d: bar diameter), the specimen could be fully anchored to fracture. An explicit hardening bond-slip model considering the post-yield stiffness of the SFCB was used to predict the bond-slip behavior of the GDPS connector, and the experimental and analytical results agreed well with each other, which demonstrates that the proposed model could provided a reference for the analysis and design of connectors for SFCB-reinforced precast concrete structures.

Damage mechanics-based modeling approaches for cyclic analysis of precast concrete structures: A comparative study

2020 ◽  
Vol 29 (6) ◽  
pp. 965-987 ◽  
Author(s):  
De-Cheng Feng ◽  
Zhun Wang ◽  
Xu-Yang Cao ◽  
Gang Wu
Keyword(s):  
Damage Mechanics ◽  
Precast Concrete ◽  
Concrete Structures ◽  
Cyclic Tests ◽  
Bond Slip ◽  
Concrete Frame ◽  
Modeling Approaches ◽  
Modeling Approach ◽  
Key Issues ◽  
Precast Structures

Precast concrete frame structures are widely adopted around the world due to their various advantages, so it is important to study their seismic performance. The development of damage mechanics has enabled us to accurately investigate the typical failure mechanisms of precast structures. This paper presents three of the most commonly used modeling approaches based on damage mechanics for analysis of precast reinforced concrete structures under cyclic loading and compares the performance of the three models. Particularly, the shear behavior of the joint panel and the bond-slip behavior of the beam–column interfaces are especially considered, which are the key issues for precast concrete structures. First, the fundamental assumptions, formulations, and modeling strategies are given in detail for each approach. Then, the unified damage mechanics for concrete is introduced, and the model for reinforcement bars and the consideration of the bond-slip effect are also presented. Several benchmark cyclic tests of precast beam-to-column connections are chosen to evaluate the accuracy and efficiency of the modeling approaches. The numerical results, e.g. the capacities, deformations, and energy dissipation of the connections, are compared to the experimental results to show the ability of each approach. With this study, we can gain a further understanding of the characteristics and applicability of each modeling approach, helping us make a better decision in choosing which modeling approach is appropriate.

scholarly journals Mechanical Properties of Steel-FRP Composite Bars under Tensile and Compressive Loading

2017 ◽  
Vol 2017 ◽  
pp. 1-11 ◽  
Author(s):  
Zeyang Sun ◽  
Yu Tang ◽  
Yunbiao Luo ◽  
Gang Wu ◽  
Xiaoyuan He
Keyword(s):  
Failure Modes ◽  
Flexural Rigidity ◽  
Compressive Loading ◽  
Concrete Structures ◽  
Frp Composite ◽  
Steel Bar ◽  
Calculated Stress ◽  
Frp Bar ◽  
Large Length ◽  
Ordinary Steel

The factory-produced steel-fiber reinforced polymer composite bar (SFCB) is a new kind of reinforcement for concrete structures. The manufacturing technology of SFCB is presented based on a large number of handmade specimens. The calculated stress-strain curves of ordinary steel bar and SFCB under repeated tensile loading agree well with the corresponding experimental results. The energy-dissipation capacity and residual strain of both steel bar and SFCB were analyzed. Based on the good simulation results of ordinary steel bar and FRP bar under compressive loading, the compressive behavior of SFCB under monotonic loading was studied using the principle of equivalent flexural rigidity. There are three failure modes of SFCB under compressive loading: elastic buckling, postyield buckling, and no buckling (ultimate compressive strength is reached). The increase in the postyield stiffness of SFCB rsf can delay the postyield buckling of SFCB with a large length-to-diameter ratio, and an empirical equation for the relationship between the postbuckling stress and rsf is suggested, which can be used for the design of concrete structures reinforced by SFCB to consider the effect of reinforcement buckling.

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.

Modified Steel Bar Model Incorporating Bond-Slip for Seismic Assessment of Concrete Structures

2012 ◽  
Vol 138 (11) ◽  
pp. 1342-1350 ◽  
Author(s):  
Franco Braga ◽  
Rosario Gigliotti ◽  
Michelangelo Laterza ◽  
Michele D’Amato ◽  
Sashi Kunnath
Keyword(s):  
Concrete Structures ◽  
Seismic Assessment ◽  
Bond Slip ◽  
Steel Bar

Validation of a Modified Steel Bar Model Incorporating Bond-Slip for Seismic Assessment of Concrete Structures

2012 ◽  
Vol 138 (11) ◽  
pp. 1351-1360 ◽  
Author(s):  
Michele D’Amato ◽  
Franco Braga ◽  
Rosario Gigliotti ◽  
Sashi Kunnath ◽  
Michelangelo Laterza
Keyword(s):  
Concrete Structures ◽  
Seismic Assessment ◽  
Bond Slip ◽  
Steel Bar

scholarly journals Beam-to-Beam Connection of Precast Concrete Structures: State of the Art

2019 ◽  
Vol 258 ◽  
pp. 04002 ◽  
Author(s):  
Kristiyanto Hery ◽  
Triwiyono Andreas ◽  
Muslikh ◽  
Saputra Ashar
Keyword(s):  
Quality Control ◽  
Concrete Structure ◽  
Cost Efficiency ◽  
Concrete Beam ◽  
State Of The Art ◽  
Precast Concrete ◽  
Concrete Structures ◽  
Reinforced Concrete Structure ◽  
Practical Application ◽  
Connection System

The use of precast concrete is known to improve productivity, quality control, and cost efficiency in reinforced concrete structure. The Connection is the most important aspect of precast concrete structures. The connection transfers force between the precast components, determine strength, stiffness, and ductility of the whole structure. Providing joint in the beam-column connection region always cause difficulties during the erection stage. Relocation of the connection at a certain distance from the column to the beam span is an alternative solution that creates the beam-to-beam connection. It will be much easier to assemble the connection that consists of some joints. Research and application of the precast concrete beam-to-beam connection details have published since 1975. This paper reviews the state of the art of research and practical application of beam-to-beam connection system related to connection models, joint locations, and details. It concluded from the review that the developing research leads to improve the performance of earthquake resisting structures

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.

scholarly journals Real-Time Monitoring of Bond Slip between GFRP Bar and Concrete Structure Using Piezoceramic Transducer-Enabled Active Sensing

Sensors ◽  
2018 ◽  
Vol 18 (8) ◽  
pp. 2653 ◽  
Author(s):  
Kai Xu ◽  
Changchun Ren ◽  
Qingshan Deng ◽  
Qingping Jin ◽  
Xuemin Chen
Keyword(s):  
Stress Wave ◽  
Lead Zirconate Titanate ◽  
Concrete Structure ◽  
Concrete Structures ◽  
Fiber Reinforced Polymers ◽  
Active Sensing ◽  
Monitoring Method ◽  
Bond Slip ◽  
Pull Out ◽  
Gfrp Bar

Glass fiber-reinforced polymers (GFRPs) have received increasing attention in recent years due to their overall performance of light weight, low cost and corrosion resistance, and they are increasingly used as reinforcement in concrete structures. However, GFRP material has low elastic modulus and linear elastic properties compared with steel bars, which introduces different bonding characteristics between bars and concrete. Therefore, a reliable monitoring method is urgently needed to detect the bond slip in GFRP-reinforced concrete structures. In this paper, a piezoceramic-based active sensing approach is proposed and developed to find the debonding between a GFRP bar and the concrete structure. In the proposed method, we utilize PZT (lead zirconate titanate) as two transducers. One acts as an actuator which is buried in the concrete structure, and the other acts as a sensor which is attached to the GFRP bar by taking advantage of machinability of the GRRP material. Both transducers are strategically placed to face each other across from the interface between the GFRP bar and the concrete. The actuator provokes a stress wave that travels through the interface. Meanwhile, the PZT patch that is attached to the GFRP bar is used to detect the propagating stress wave. The bonding condition determines how difficult it is for the stress wave traveling through the interface. The occurrence of a bond slip leads to cracks between the bar and the concrete, which dramatically reduces the energy carried by the stress wave through the interface. In this research, two specimens equipped with the PZT transducers are fabricated, and pull-out tests are conducted. To analyze the active sensing data, we use wavelet packet analysis to compute the energy transferred to the sensing PZT patch throughout the process of debonding. Experimental results illustrate that the proposed method can accurately capture the bond slip between the GFRP bar and the concrete.

scholarly journals Experimental Studies on Bond Performance of BFRP Bars Reinforced Coral Aggregate Concrete

2019 ◽  
Vol 13 (1) ◽  
Author(s):  
Lei Wang ◽  
Zhaoping Song ◽  
Jin Yi ◽  
Jiayi Li ◽  
Feng Fu ◽  
...  
Keyword(s):  
Failure Modes ◽  
Fiber Reinforced Polymer ◽  
Constitutive Relationship ◽  
Fiber Reinforced ◽  
Ocean Engineering ◽  
Aggregate Concrete ◽  
Bond Slip ◽  
Bond Performance ◽  
Pull Out ◽  
Reinforced Polymer

Abstract Basalt fiber reinforced polymer (BFRP) rebars reinforced coral aggregate concrete is a new type of concrete used in ocean engineering. In order to investigate the bond performance between BFRP rebars and coral concrete, 30 pull-out tests were carried out in 10 groups with different diameters of BFRP rebars, bonding lengths and strength of the coral concrete. The results show that good bonding between BFRP rebars and coral concrete were achieved. The main failure modes can be categorized as BFRP rebars pull out destruction, splitting failure of coral concrete and BFRP rebars fracture. The bond slip ($$\tau{\text{-}}s$$ τ - s ) curves of the BFRP rebars and coral concrete were obtained during the tests. It was found to be similar to the common concrete using fiber reinforced polymer (FRP) bars. The bond-slip relation can be roughly divided into micro-slip phase, slip phase, decline phase, and the residual stress stage. The bond between BFRP rebars and coral concrete increases with the increase of the bond length and diameter of BFRP rebars, but the average bond stress will decrease. Moreover, increasing the strength of coral concrete is effective to improve the bond performance of BFRP rebars. In this paper, the continuous bond slip model (Gao et al. in J Zhengzhou Univ 23:1–5, 2002) was used to represent the $$\tau{\text{-}}s$$ τ - s constitutive relationship of BFRP rebars and coral concrete. The analysis show that the proposed model has a high degree of accuracy in representing $$\tau{\text{-}}s$$ τ - s curve of BFRP rebars and coral concrete.

Tolerances for Precast Concrete Structure

PCI Journal ◽  
1976 ◽  
Vol 21 (4) ◽  
pp. 44-57
Author(s):  
Marvin L. Vander ◽  
H. Carl Walker
Keyword(s):  
Concrete Structure ◽  
Precast Concrete
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