A simplified shear strength evaluation m

This paper presents a theoretical approach to evaluate the uncertainties and the correlation of the shear strength parameters c and t (cohesion and friction coefficient), obtained in direct shear tests. The analysis is based on the hypothesis that the soil is statistically homogeneous, with shear strength normally distributed having an expected resistance which is linearly dependent on the effective normal stress. With regard to the scatters of the population of the shear strength, two further statements have been formulated for the standard deviation: (1) a constant value, independent of the effective normal stresses and (2) a value which is linearly dependent on the normal effective stresses as a consequence of a constant coefficient of variation. The investigation shows that the strength parameters are negatively correlated and the coefficient of correlation and the coefficients of variation of cohesion and friction angle are highly dependent on the number of shear tests and the normal stresses used in the tests.

2016

A thesis submitted to the University of Cape Town in partial fulfilment of the requirement for the degree of Master of Science in Engineering Faculty of Engineering and Built Environment Department of Civil Engineering

International Journal of Geo-Engineering, 2016

In contrast to other engineering materials, soil resist applied loads by means of friction and cohesion between particles that is known as shear strength. The shearing resistance of soil depends mainly on soil composition, stress history, strain, strain rate, voids ratio, cohesion, and friction between particles [17]. A functional form that considers all these parameters are too complex and several simplifications were done to assess the shear strength of soil. The most widely used functional form of shear strength is the Mohr-Coulomb equation, which simplify the soil shear strength to depend only on cohesion, internal friction angle, and confining stress [2].

Engineering Structures, 2020

Shear strength of reinforced concrete beams has been profoundly studied by many experimental campaigns conducted on simply supported beams. This situation has led to implement empirical design formulations in codes that cannot be representative of other real structures, such as continuous beams. They are characterised by the potential development of plastic hinges in areas of maximum shear and by the existence of an inflection point in the shear span, but very few experimental studies on them have been conducted. This paper analyses the results of an experimental programme involving 15 beams whose main objective was to analyse the shear strength of cantilever and continuous reinforced concrete beams according to different shear reinforcement ratios. Nine beams of 9.00 m and six of 7.00 m with rectangular cross-sections were tested under different load and support conditions, which resulted in 30 different shear tests performed in all, two tests per beam. Three different series were considered according to the shear reinforcement ratios of 0%, 0.13%, and 0.20%. Apart from traditional instrumentation, such as strain gauges and displacement transducers, digital image correlation was employed to provide accurate displacement measurements. The results showed that the shear strength provided by concrete (different shear-transfer actions from shear reinforcement) decreased as bending rotation increased within both the elastic and plastic ranges of rotations developed in continuous beams. Moreover, this shear strength component weakened for increasing shear reinforcement ratios. Shear slenderness was redefined for continuous beams that failed after yielding of the tensile reinforcement and redistribution of internal forces. The code formulation provided by ACI 318-19, Eurocode 2 and Model Code 2010 for shear strength were checked against these experimental results, which showed that the iterative formulation that contemplates the M-V interaction considerably improved shear strength predictions from simple formulations.

Proceedings of the ICE - Geotechnical Engineering, 2008

This process for determination of ground properties (following Eurocode 7, Part 1) 1 has been described by Orr 3 and by Frank et al. 4 Fig. 2 shows the individual steps necessary to establish Geotechnical Engineering 161 Issue GE5 Refining shear strength characteristic value using experience Baxter et al. 247

2006

ABSTRACT A new experimental apparatus has been developed for performing shear tests on specimens held under moderately high hydrostatic pressures (on the order of 4 GPa). This testing procedure experimentally determines the pressure-dependent shear strength of thin foil specimens.

Transactions of FAMENA

In this paper, the authors determine the shear modulus using a pure tensile test without the application of pure shear external load. In order to validate the computer-aided theoretical model, a measurement setup was designed and built by the authors. A theoretical model was realized by finite element model in order to simulate the torsion effect exerted by a pure shear mode. The authors have validated the theoretical and experimental results using a new and innovative photostress measurement.

2012

The CONCRACK bench mark by French research project CEOS was devoted to cracking phenomenon in reinforced concrete structures. Several real scale specimens were produced and tested to failure, whereas a detail measurements of load, deformations and cracking were recorded Authors participated in a prediction mark study of experimental behavior of shear wall under monotonic loading models used by authors for simulation shear wall behavior were based on representations. The paper describes the models and results of analysis and aspects of model uncertainties involved in prediction and follow-up phases of resistance verification.

Rock Mechanics and Rock Engineering, 2015