Evaluation of longitudinal bond shear stress and bond-slip relationship in composite concrete slabs using partial shear connection method

2012 ◽  
pp. 269-274 ◽  
Author(s):  
A Gholamhoseini ◽  
R Gilbert ◽  
M Bradford ◽  
Z Chang
Keyword(s):  
Shear Stress ◽  
Concrete Slabs ◽  
Bond Slip ◽  
Shear Connection ◽  
Connection Method

Longitudinal shear stress and bond–slip relationships in composite concrete slabs

2014 ◽  
Vol 69 ◽  
pp. 37-48 ◽  
Author(s):  
A. Gholamhoseini ◽  
R.I. Gilbert ◽  
M.A. Bradford ◽  
Z.T. Chang
Keyword(s):  
Shear Stress ◽  
Longitudinal Shear ◽  
Concrete Slabs ◽  
Bond Slip

Interface Shear Stress of Concrete Beams Strengthened with FRP in Salt Water

2012 ◽  
Vol 446-449 ◽  
pp. 3499-3502
Author(s):  
Chen Zhao ◽  
Pei Yan Huang ◽  
Zhong Song Chen
Keyword(s):  
Shear Stress ◽  
Concrete Beam ◽  
Salt Water ◽  
Interfacial Shear Stress ◽  
Interfacial Properties ◽  
Interfacial Shear ◽  
Interface Shear ◽  
Interface Shear Stress ◽  
Bond Slip ◽  
Relationship Model

Based on existing methods and results of other research, the bond-slip relationship model is given and the distrubition of shear stress of concrete beam strengthened by FRP in salt water is derived. Through a specific example to analyze the distribution of interfacial shear stress, and the different effects caused by different aggressive environment on the interfacial properties. The results show that: 1) Interfacial shear stress will sharply reduce with increasing distance from the end; 2) Different environments have different effects on the interface properties of FRP strengthened beams. Salt water erosion influnce the interfacial properties of FRP strengthened beams significantly.

Analytical Modeling of the Bond Behavior between ‎Textile ‎and Mortar Based on Pull-Out ‎Tests

2019 ◽  
Vol 817 ◽  
pp. 112-117 ◽  
Author(s):  
Ali Dalalbashi ◽  
Bahman Ghiassi ◽  
Daniel V. Oliveira
Keyword(s):  
Mathematical Model ◽  
Shear Stress ◽  
Boundary Conditions ◽  
Analytical Modeling ◽  
Relative Slip ◽  
Bond Slip ◽  
Bond Behavior ◽  
Existing Structures ◽  
Pull Out ◽  
The Subject

It is clear that the fiber-to-mortar bond behavior plays a major role on the performance of Textile Reinforced Mortars (TRMs) used for strengthening of existing structures. This aspect, however, has been only the subject of few studies and require further attention.This paper presents an analytical model for extraction of the textile-to-‎mortar bond-slip laws from pull-out tests. The ‎objective is to ‎characterize the parameters that ‎influence the ‎pull-out behavior of TRM ‎systems. ‎In the formulation of the ‎pull-out model, a ‎modified approach ‎based ‎on a mathematical model by Naaman ‎is applied. Firstly, based on ‎the ‎experimental ‎results, a relationship between the bond shear stress and the ‎relative slip ‎along the fiber-mortar ‎interface is obtained. Then, based on the ‎shear stress-slip law, the ‎boundary conditions, equations ‎of equilibrium, and ‎the equation of ‎compatibility and hooke’s ‎law, the bond response ‎between ‎textile and mortar is predicted and modeled.

scholarly journals Shear Connection between Steel and Concrete in Composite Structure

2019 ◽  
Vol 8 (12S) ◽  
pp. 17-23
Keyword(s):  
Concrete Slabs ◽  
Structural Elements ◽  
Composite Construction ◽  
Concrete Element ◽  
Shear Transfer ◽  
Composite Action ◽  
Shear Connectors ◽  
Shear Connection ◽  
The Past ◽  
Structural Aspects

For the past few decades, the construction field has been moving towards the usage of steel-concrete composite structural elements in most of its construction. Various research works are carried out to increase the structural aspects of such composite construction. Shear connector between concrete and steel elements in composite construction plays an important role in developing the composite action by ensuring proper shear transfer between the steel profile and the concrete element. The connections between the steel and concrete sections are mostly done using welding, given the durability and strength of welding. For the current study, the shear connectors, connecting the concrete slabs and steel beam, are welded to the flanges of the beam. Given the flexible nature of the shear connectors, they can be available in various shapes and sizes. The performance of each connector was evaluated and compared. The main comparison between the specimens was carried out by comparing the load slip behavior of the specimens.

Development of ductile cast-iron bridge slabs for onsite replacement

2021 ◽  
Author(s):  
Shinsuke Akamatsu ◽  
Hironobu Tobinaga ◽  
Kunihiro Oshima‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌ ◽  
Norihiro Nohara
Keyword(s):  
Cast Iron ◽  
Reinforced Concrete ◽  
Mild Steel ◽  
Fatigue Resistance ◽  
Heavy Traffic ◽  
Ductile Cast Iron ◽  
Concrete Slabs ◽  
Reinforced Concrete Slabs ◽  
Connection Method ◽  
Study Results

<p>Most of the road bridges in Japan were constructed in the 1960s and 1970s, and many of them have been in service for more than 50 years. The reinforced concrete slabs of such bridges have been damaged and deteriorated by heavy traffic. Although these slabs have already been reinforced with steel plates, they have deteriorated further and need to be replaced.</p><p>The renewal of reinforced concrete slabs leads to increase of dead load, the fatigue damage at welds has not been completely solved in the case of steel slabs, and the social loss due to long-term road closures at the renewal construction of the slabs on urban highways. Therefore, there is an urgent need to develop an alternative slab that is lighter in dead weight, has good fatigue resistance, and can be installed rapidly.</p><p>The proposed slabs in this paper are made of ductile cast-iron instead of mild steel. Ductile cast-iron bridge deck can be light-weighted like mild steel, can show high fatigue resistance with improved residual stress and detail by integrally forming into complex shapes, and can be rapidly installed to the existing bridges by bolts.</p><p>The Hanshin Expressway has been conducting research and development for the practical application of ductile cast-iron slabs. This paper will introduce a ductile cast-iron deck, and will shows the study results of the details of the slab panels, the slab-to-slab connection method, and the slab-to-girder connection method.</p>

scholarly journals Bond Behavior of Carbon Fabric-Reinforced Matrix Composites: Geopolymeric Matrix versus Cementitious Mortar

Buildings ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 207
Author(s):  
Feras Abu Obaida ◽  
Tamer El-Maaddawy ◽  
Hilal El-Hassan
Keyword(s):  
Shear Stress ◽  
Matrix Model ◽  
Maximum Shear Stress ◽  
Matrix Composites ◽  
Matrix Interface ◽  
Carbon Fabric ◽  
Bond Slip ◽  
Bond Behavior ◽  
Cementitious Matrix ◽  
Lap Shear

This study aims to examine the potential use of a geopolymeric matrix as a sustainable alternative to commercial mortars in carbon fabric-reinforced matrix composites. Single-lap shear tests were conducted to examine the bond behavior at the fabric-matrix interface. Test parameters included the type of matrix (geopolymeric and cementitious matrices) and the bonded length (50 to 300 mm). The geopolymeric matrix was a blend of fly ash/ground granulated blast furnace slag activated by an alkaline solution of sodium silicate and sodium hydroxide. The bond behavior of the geopolymeric-matrix specimens was characterized and compared to that of similar specimens with a cementitious matrix. The specimens failed due to fabric slippage/debonding at the fabric-matrix interface or fabric rupture. The effective bond lengths of the geopolymeric- and cementitious-matrix specimens were 150 and 170 mm, respectively. The geopolymeric-matrix specimens exhibited higher fabric strains, higher ultimate loads, and a steeper strain profile along the bonded length than those of their cementitious-matrix counterparts. New bond-slip models that characterize the bond behavior at the fabric-matrix interface for geopolymeric- and cementitious-matrix specimens were developed. Both models exhibited equal maximum shear stress of 1.2 MPa. The geopolymeric-matrix model had, however, higher fracture energy and higher slip at maximum shear stress than those of the cementitious matrix model.

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