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.

Effect of poisson's ratio strains in adherends on stresses of an idealized lap joint

1973 ◽  
Vol 8 (2) ◽  
pp. 134-139 ◽  
Author(s):  
R D Adams ◽  
N A Peppiatt
Keyword(s):  
Shear Stress ◽  
Poisson’S Ratio ◽  
Longitudinal Shear ◽  
Poisson's Ratio ◽  
Shear Stresses ◽  
Lap Joint ◽  
Stress Concentrations ◽  
Maximum Value ◽  
Set Up ◽  
Transverse Stresses

Poisson's ratio strains in the adherends of a simple adhesive lap joint induce transverse stresses both in the adhesive and in the adherends. Two simultaneous second-order partial-differential equations were set up to describe the normal stresses along and across an adherend and were solved both by an approximate analytical method and a finite-difference technique: the two solutions agreed closely. The adhesive shear stresses can then be obtained by differentiating these solutions. The transverse shear stress has a maximum value for metals of about one-third of the maximum longitudinal shear stress, and this occurs at the corners of the lap, thus making the corners the most highly stressed parts of the adhesive. Bonding adherends of dissimilar stiffness was shown to produce greater stress concentrations in the adhesive than when similar adherends are used.

scholarly journals The energetics of the breakup of a sheet and of a rivulet on a vertical substrate in the presence of a uniform surface shear stress

2011 ◽  
Vol 674 ◽  
pp. 281-306 ◽  
Author(s):  
S. K. WILSON ◽  
J. M. SULLIVAN ◽  
B. R. DUFFY
Keyword(s):  
Shear Stress ◽  
Critical Thickness ◽  
Longitudinal Shear ◽  
Surface Shear Stress ◽  
Lubrication Approximation ◽  
Volume Flux ◽  
Uniform Thickness ◽  
Surface Shear ◽  
Total Energies ◽  
Break Up

We use the lubrication approximation to obtain a complete description of the energetics of the breakup both of a fluid sheet of uniform thickness into a periodic array of infinitely many identical thin rivulets and of a single thin rivulet into one or more identical sub-rivulets on a vertical substrate in the presence of a prescribed uniform longitudinal shear stress at the free surface of the fluid by comparing the total energies of the different states. For both problems the situation when the volume flux is positive is relatively straightforward (and, in particular, qualitatively the same as that in the case of no prescribed shear stress), but when the volume flux is negative it is more complicated. However, whatever the value of the prescribed shear stress, there is always a critical thickness below which it is energetically favourable for a sheet to break up into rivulets and a critical semi-width below which it is energetically favourable for a rivulet to remain as a single rivulet, and a critical thickness above which it is energetically favourable for a sheet to remain as a sheet and a critical semi-width above which it is energetically favourable for a rivulet to break up into sub-rivulets.

scholarly journals Performance Evaluation of Different Types of Shear Connectors in Steel–Concrete Composite Construction

2018 ◽  
Vol 64 (2) ◽  
pp. 97-110
Author(s):  
V. Jayanthi ◽  
C. Umarani
Keyword(s):  
Concrete Slab ◽  
Longitudinal Shear ◽  
Concrete Slabs ◽  
Steel Beam ◽  
Cement Concrete ◽  
Composite Construction ◽  
Shear Connectors ◽  
Different Types ◽  
Reinforced Cement ◽  
Push Out

AbstractShear connectors are designed in steel-concrete composite construction to transmit the longitudinal shear, to prevent separation of steel and concrete slabs, and also to increase the structural efficiency of the whole system. In this study, the performances of different types of shear connectors in steel-concrete composite specimens are evaluated by conducting push-out tests under monotonic loading conditions. An ISMB 200 @ 25.4 kg/m universal steel beam measuring 400 mm and a reinforced cement concrete slab measuring 300 mm with a breadth of 200 mm and a thickness of 200 mm reinforced with 8 mm diameter steel rods are used for the experimental study. The results reveal that the load-slip relationships for various types of shear connectors and failure mechanisms are obtained to identify those shear connectors which are more relevant to the steel - concrete composite members.

scholarly journals Investigations on Interface Shear Fatigue of Semi-Precast Slabs with Lattice Girders

2021 ◽  
Vol 11 (23) ◽  
pp. 11196
Author(s):  
Matthias Hillebrand ◽  
Maximilian Schmidt ◽  
Katrin Wieneke ◽  
Martin Classen ◽  
Josef Hegger
Keyword(s):  
Fatigue Behavior ◽  
Precast Concrete ◽  
Longitudinal Shear ◽  
Fatigue Tests ◽  
Vertical Shear ◽  
Experimental Investigations ◽  
Concrete Slabs ◽  
Interface Shear ◽  
Fatigue Design ◽  
Shear Fatigue

Due to their high cost efficiency and flexibility, semi-precast concrete slabs with lattice girders are widely used in constructions all over the world. Prefabricated concrete slabs, combined with in situ concrete topping, exhibit a quasi-monolithic structural behavior in which lattice girders serve as vertical shear reinforcement and ensure the transfer of longitudinal shear within the interface, acting in combination with concrete-to-concrete bonding mechanisms. To be applicable in industrial and bridge construction, semi-precast slabs need to have sufficient resistance against fatigue failure. To improve and expand the limits of application, theoretical and experimental investigations are conducted at the Institute of Structural Concrete (IMB), RWTH Aachen University. To investigate the fatigue behavior of lattice girders, small size tests with lattice girder diagonals were carried out. These test results have been used to derive an S–N curve (S: stress, N: number of load cycles) for lattice girders for a more refined fatigue design. Subsequently, the fatigue behavior of semi-precast slabs with lattice girders was investigated by fatigue tests on single-span slab segments. The fatigue design regulations of lattice girders according to technical approvals can generally be confirmed by this test program; however, they tend to be conservative. The use of the derived S–N curve leads to significantly improved agreement of fatigue behavior observed in tests and design expressions.

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.

Shear Strength and Failure Angle Analysis of Fillet Welds Based on Structural Stress Approach

2013 ◽  
Vol 364 ◽  
pp. 52-56 ◽  
Author(s):  
Chun Ge Nie ◽  
Wen Zhong Zhao ◽  
Yue Dong Wang
Keyword(s):  
Finite Element ◽  
Shear Stress ◽  
Shear Strength ◽  
Element Model ◽  
Longitudinal Shear ◽  
Fillet Welds ◽  
Structural Stress ◽  
Shear Tests ◽  
Failure Angle ◽  
Single Shear

With conventional shear stress formula given in AWS B4.0, huge difference of strength between longitudinal and transverse fillet welds exists, and different failure angle of two type welds could not be interpreted. In this paper, a mesh-insensitive structural stress based shear strength definition is presented for correlating weldment test data obtained from longitudinal and transverse fillet welds in literature. Finite element model were created according to the geometry of specimens, and shear stress at different cut plane of weld were calculated. Failure angle could be interpreted reasonably for two type fillet welds, and discrepancies in shear strength between transverse and longitudinal shear tests can now be reconciled, resulting in a single shear strength value regardless of specimen types and loading conditions with this proposed approach.

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