• Title/Summary/Keyword: bond-slip behavior

Search Result 170, Processing Time 0.02 seconds

Experimental Study on Bond Stress-Slip Behavior of Reinforced Concrete Member Under Repeated Loading Considering Steel Corrosion (반복하중 하에서 철근부식을 고려한 철근콘크리트 부재의 부착응력-슬립 거동에 관한 실험적 연구)

  • Kim, Chul-Min;Kim, Jee-Sang;Park, Jong-Bum;Chang, Sung-Pil
    • Proceedings of the Korea Concrete Institute Conference
    • /
    • 2006.11a
    • /
    • pp.545-548
    • /
    • 2006
  • This study includes the experimental investigation on the fatigue-bond behavior with respect to the various rates of steel corrosion. Major criteria of test variables are the rates of steel corrosion by chloride ion and the ratio of the applied stress to the bond failure stress. According to the test results, the slip versus number of load cycles relation was found to be approximately linear in double logarithmic scale, not only without steel corrosion but also with steel corrosion. This research will be helpful for the realistic durability design and condition assessment of reinforced concrete structures.

  • PDF

Non-linear Structural Analysis of Composite Beams Considering the Bond-slip Effect (부착슬립 효과를 고려한 합성보의 비선형 해석)

  • Kwak, Hyo-Gyoung;Hwang, Jin-Wook
    • Proceedings of the Korea Concrete Institute Conference
    • /
    • 2009.05a
    • /
    • pp.25-26
    • /
    • 2009
  • This paper deals with an introduction of a numerical model which is based on finite element concept to simulate bond-slip behavior in composite beams. Correlation studies between numerical results and experimental values were conducted to verify the model.

  • PDF

Nonlinear Finite Element Analysis of Reinforced Concrete Structures Considering the Crack and Bond-Slip Effects (균열 및 부착슬립효과를 고려한 철근콘크리트 구조물의 비선형 유한요소해석)

  • 곽효경
    • Proceedings of the Computational Structural Engineering Institute Conference
    • /
    • 1992.04a
    • /
    • pp.65-70
    • /
    • 1992
  • This study deals with the finite element analysis of the monotonic behavior of reinforced concrete beams and beam-column joint subassemblages. It is assumed that the behavior of these members can be discribed by a plane stress field. Concrete and reinforcing steel are represented by separate material models which are combined together with a model of the interaction between reinforcing bar and concrete through bond-slip to discribe the behavior of the composite reinforced concrete material. To discribe the concrete behavior, a nonlinear orthotropic model is adopted and the crack is discribed by a system of orthogonal cracks, which are rotating as the principal strain directions are changed. A smeared finite element model based on the fracture mechanics principles are used to overcome the numerical defect according to the finite element mesh size. Finally, correlation studies between analytical and experimental results and several parameter studies are conducted with the objective to estabilish the validity of the proposed model and identify the significance of various effects on the local and global response of reinforced concrete members.

  • PDF

Analytical Evaluation of Beam-Bar Bond and Anchorage in Beam-column joints under Cyclic Loading (주기하중을 받는 보-기둥 접합부내 보주철근 부착 및 정착의 해석적 평가)

  • Oh Soo-Yeun;Lee Joo-Ha;Yoon Young-Soo
    • Proceedings of the Korea Concrete Institute Conference
    • /
    • 2004.05a
    • /
    • pp.510-513
    • /
    • 2004
  • The objectives of this research are to evaluate the effect of the compressive strength of concrete, reinforcing bar size, spacing of column transverse bars related to the concrete confinement effects on anchorage bond strength and bond behavior of beam-column joints subjected to cyclic loading and to predict the bond behavior of beam-column joints according to the variables by Finite Element Analysis appling the interface element between concrete and reinforced bar surface in a three-dimensional configuration. This paper shows that to verify the results by three-dimensional nonlinear finite element analysis appling a interface element, the test results that were already conducted are compared with analytic results. The behavior of bond and anchorage of beam bar is expressed by a local bond stress-slip relationship and the failure mode of bond is predicted by principal stress contour.

  • PDF

Bond Properties of GFRP Rebar in Fiber Reinforced Concrete (Engineered Cementitious Composite) (섬유보강 콘크리트(ECC)와 GFRP 보강근의 부착 특성)

  • Choi, Yun-Cheul;Park, Keum-Sung;Choi, Chang-Sik;Choi, Hyun-Ki
    • Journal of the Korea Concrete Institute
    • /
    • v.23 no.6
    • /
    • pp.809-815
    • /
    • 2011
  • An experimental investigations on the bond-slip properties of the steel and Glass Fiber Reinforced Polymer(GFRP) bars in engineered cementitious composite (ECC) with Polyvinyl Alcohol (PVA) fibers are presented. Total of 8 beam specimens prepared according to the Rilem procedures with 2% of PVA and PE fiber volume percentage and steel and GFRP reinforcements significantly changed the failure mechanism and slightly improved bond strength. The main objective of the tests was to evaluate the load versus displacement and load versus slip behaviors and the bond strength for the following parameters: concrete type (normal and fiber concrete) and bar diameter (10 and 13 mm). The study results showed that ordinary concrete and ECC specimens showed similar behavior for steel reinforced specimen. However, GFRP reinforced specimen showed different behavior that the steel specimen. The code analytical results showed more accuracy compared to the experimental results as expected in conservative code provisions. Based on the obtained results, it is safe to conclude that the new parameters need to be adopted to ensure safe usage of ECC for construction applications.

Bond behavior between concrete and prefabricated Ultra High-Performance Fiber-Reinforced Concrete (UHPFRC) plates

  • Mansour, Walid;Sakr, Mohammed A.;Seleemah, Ayman A.;Tayeh, Bassam A.;Khalifa, Tarek M.
    • Structural Engineering and Mechanics
    • /
    • v.81 no.3
    • /
    • pp.305-316
    • /
    • 2022
  • Externally bonded ultrahigh performance fiber-reinforced concrete (UHPFRC) is commonly used as a strengthening material for reinforced concrete (RC) structures. This study reports the results of an experimental program investigating the bonding behavior between concrete and prefabricated UHPFRC plates. The overall experimental program is consisting of five RC specimens, which are strengthened using the different lengths and widths of prefabricated UHPFRC plates. These specimens were analyzed using the pull-pull double-shear test. The performance of each strengthened specimen is presented, discussed and compared in terms of failure mode, maximum load, load-slip relationship, fracture energy and strain distribution. Specimen C-25-160-300 which bonded along the whole width of 160 mm recorded the highest maximum load (109.2 kN) among all the analysed specimens. Moreover, a 3D numerical finite element model (FEM) is proposed to simulate the bond behavior between concrete and UHPFRC plates. Moreover, this study reviews the analytical models that can predict the relationship between the maximum bond stress and slip for strengthened concrete elements. The proposed FEM is verified against the experimental program and then used to test 36 RC specimens strengthened with prefabricated UHPFRC plates with different concrete grades and UHPFRC plate widths. The obtained results together with the review of analytical models helped in the formation of a design equation for estimating the bond stress between concrete and prefabricated UHPFRC plates.

Bond Stress in Concrete Pilled Steel Tubular Column (CFT 기둥의 부착응력에 관한 연구)

  • 권승희;김진근
    • Journal of the Korea Concrete Institute
    • /
    • v.13 no.2
    • /
    • pp.93-98
    • /
    • 2001
  • CFT column has excellent structural properties due to the composite action between concrete and steel tube. The bond behavior between the constituent elements has to be found for analyzing the behavior of CFT column. A new model is necessary because most of existing models for bond stress-slip relationship of the deformed bar cannot be applied to the CFT column. Therefore, the objective of this research is to develop a new model related to the bond behavior of CFT column considering the relation between bond stress and vertical stress, and the distribution of lateral stress under the confinement created by steel casing. From equilibrium condition, the formula for relationship between bond stress and vertical stress is derived, and the relationship for the lateral stresses of the CFT column section is obtained by an Airy stress function. The experiments are performed for five CFT column specimens axially loading on concrete alone. The relation between bond strength and lateral stress is investigated from the regression analysis using the measured strains. Finally a new bond strength model is proposed, which is able to predict the relationship for the stress of each direction of CFT column loading on concrete.

Implementation of Bond Slip Effect in Analysis of RC Beams Using Layerd Section Method (적층단면법에 의한 철근콘크리트 보 해석에서의 부착슬립효과)

  • Kim Jin-Kook;Kwak Hyo-Gyoung
    • Journal of the Computational Structural Engineering Institute of Korea
    • /
    • v.19 no.1 s.71
    • /
    • pp.1-13
    • /
    • 2006
  • An analytical procedure to analyze reinforced concrete(RC) beams and columns subject to monotonic and cyclic loadings is proposed on the basis of the layered section method. In contrast to the classical nonlinear approaches adopting the perfect bond assumption, the bond slip effect along the reinforcing bar is quantified with the force equilibrium and compatibility condition at the post cracking stage and its contribution is implemented into the reinforcing. The advantage of the proposed analytical procedure, therefore, will be on the consideration of the bond slip effect while using the classical layered section method without additional consideration such as taking the double nodes. Through correlation studies between experimental data and analytical results, it Is verified that the proposed analytical procedure can effectively simulate the cracking behavior of RC beams and columns accompanying the stiffness degradation caused by the bond slip.

Modified cyclic steel law including bond-slip for analysis of RC structures with plain bars

  • Caprili, Silvia;Mattei, Francesca;Gigliotti, Rosario;Salvatore, Walter
    • Earthquakes and Structures
    • /
    • v.14 no.3
    • /
    • pp.187-201
    • /
    • 2018
  • The paper describes a modified cyclic bar model including bond-slip phenomena between steel reinforcing bars and surrounding concrete. The model is focused on plain bar and is useful, for its simplicity, for the seismic analyses of RC structures with plain bars and insufficient constructive details, such as in the case of '60s -'70s Mediterranean buildings. The model is based on an imposed exponential displacements field along the bar including both steel deformation and slip; through the adoption of equilibrium and compatibility equations a stress-slip law can be deducted and simply applied, with opportune operations, to RC numerical models. This study aims to update and complete the original monotonic model published by the authors, solving some numerical inconsistencies and, mostly, introducing the cyclic formulation. The first aim is achieved replacing the imposed linear displacement field along the bar with an exponential too, while the cyclic behaviour is described through a formulation based on the results of parametric analyses concerning a large range of steel and concrete properties and geometric configurations. Validations of the proposed model with experimental results available in the current literature confirm its accuracy and the reduced computational burden, highlighting its suitability in performing nonlinear analyses of RC structures.

Experimental Study on Interfacial Bond Stress between Aramid FRP Strips and Steel Plates (아라미드 FRP 스트립과 강판 사이의 계면 부착응력에 관한 실험적 연구)

  • Park, Jai Woo;Ryoo, Jae Yong;Choi, Sung Mo
    • Journal of Korean Society of Steel Construction
    • /
    • v.27 no.4
    • /
    • pp.359-370
    • /
    • 2015
  • This paper presents the experimental results for the interfacial bond behaviour between AFRP strip and steel members. The objective of this paper is to examine the interfacial behavior and to evaluate the interfacial bond stress between Aramid FRP strips and steel plates. The test variables were bond length and AFRP thickness. 18 specimens were fabricated and one-face shear type bond tests were conducted in this study. There were two types of failure mode which were debonding and delamination between AFRP strip and steel plates. From the test, the load was increased with the increasing of bond length and AFRP thickness, which was observed that maximum increase of 63 and 86% were also achieved in load with the increasing of bond length and AFRP thickness, respectively. Finally, bond and slip characteristics had the elastic bond-slip model and it was observed that bond strength and fracture energy were not affected by bond length and AFRP thickness.