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Xiao Ling Zhao - One of the best experts on this subject based on the ideXlab platform.

  • cfrp strengthening of rectangular steel tubes subjected to End Bearing loads effect of adhesive properties and finite element modelling
    Thin-walled Structures, 2009
    Co-Authors: Dilum Fernando, J G Teng, Xiao Ling Zhao
    Abstract:

    The End-Bearing capacity of a rectangular hollow section (RHS) steel tube can be substantially increased through local strengthening using bonded carbon fibre reinforced polymer (CFRP) plates. As failure of such a strengthened tube generally occurs by debonding of the CFRP plates from the steel tube, the effectiveness of such strengthening depEnds significantly on the properties of the adhesive. This paper presents the results of an experimental study aimed at clarifying the effects of adhesive properties on the failure mode and the load-carrying capacity. The experimental programme included sixteen tests covering five different commercially available adhesives. Four different failure modes were observed in these tests: (1) adhesion failure; (2) cohesion failure; (3) combined adhesion and cohesion failure; (4) interlaminar failure of CFRP plates. The tests also revealed that an adhesive with a larger ultimate tensile strain leads to a greater load-carrying capacity of the strengthened RHS tube. Besides the experimental study, this paper also presents results from a finite element study aimed at predicting the behaviour of CFRP-strengthened RHS tubes under End Bearing loads, with the focus on the interfacial stresses developed in the adhesive layer. The finite element results explain well the experimental behaviour of the strengthened tubes.

  • Web buckling of lightsteel beams strengthened with CFRP subjected to End-Bearing forces
    Thin-Walled Structures, 2009
    Co-Authors: Xiao Ling Zhao, Riadh Al-mahaidi
    Abstract:

    The web-crippling failure becomes critical at the loading points or supports of beams where concentrated Bearing forces are applied. This paper presents the test results on CFRP-stiffened lightsteel beam (LSB) under End-Bearing loads. A series of laboratory tests were conducted. Three types of strengthening methods were used; applying CFRP plates on the outer side or inner side or both sides of the web. It was found that the CFRP strengthening significantly increases the web-buckling capacity especially for those with large web depth-to-thickness ratio. Simple models are proposed to predict the improved performance due to CFRP strengthening.

  • FINITE ELEMENT MODELLING OF CFRP-STRENGTHENED RECTANGULAR STEEL TUBES SUBJECTED TO End Bearing LOADS
    2007
    Co-Authors: N G Fernando, J G Teng, Xiao Ling Zhao
    Abstract:

    Recent tests undertaken at Monash University have shown that externally bonded carbon fibre reinforced polymer (CFRP) plates are effective in enhancing the End Bearing load capacity of steel rectangular hollow section (RHS) tubes. This paper reports the first stage of the authors’ work on the finite element modelling of the behaviour of CFRP-strengthened steel rectangular hollow section (RHS) tubes under End Bearing forces. A finite element model is presented and is shown to provide close predictions of the initial part of the experimental loaddisplacement behaviour of CFRP-strengthened RHS tubes obtained using a test set-up that allows the Bearing plate to rotate about a transverse axis. However, the finite element model significantly overestimated the ultimate load because debonding of the CFRP plates from the steel section was not considered in the finite element model. In order to accurately model the behaviour of CFRP-strengthened RHS tubes, it is necessary to simulate the debonding behaviour appropriately. Further research should thus focus on the accurate simulation of this debonding behaviour.

  • Performance of CFRP strengthened lightsteel beams subjected to End Bearing forces
    2007
    Co-Authors: Xiao Ling Zhao, Riadh Al-mahaidi
    Abstract:

    The web crippling failure becomes critical at the loading points or supports of beams where concentrated Bearing forces are applied. This paper presents the test results on CFRP stiffened LightSteel Beam (LSB) under End Bearing loads. A series of laboratory tests were conducted. Three types of strengthening methods were used; applying CFRP plates on the outer side or inner side or both sides of the web. It was found that the CFRP strengthening significantly increases the web buckling capacity especially for those with large web depth-tothickness ratio. Simple models are proposed to predict the improved performance due to CFRP strengthening.

  • cfrp strengthened rhs subjected to transverse End Bearing force
    Engineering Structures, 2006
    Co-Authors: Xiao Ling Zhao, Dilum Fernando, Riadh Almahaidi
    Abstract:

    This paper reports the improved web crippling behaviour of RHS (rectangular hollow section) strengthened by CFRP (Carbon Fibre Reinforced Polymer). Several types of strengthening were adopted, such as wrapping CFRP sheeting outside the RHS or applying CFRP plates outside or/and inside the RHS. It was found that the CFRP strengthening significantly increases the web crippling capacity especially for those with large web depth-to-thickness ratio. Design models are proposed to predict the increased capacity for CFRP strengthened RHS subjected to transverse End Bearing force.

Gregory J. Hancock - One of the best experts on this subject based on the ideXlab platform.

  • square and rectangular hollow sections under transverse End Bearing force
    Journal of Structural Engineering-asce, 1995
    Co-Authors: Xiao Ling Zhao, Gregory J. Hancock
    Abstract:

    This paper describes tests on a range of cold-formed square and rectangular hollow section members subject of End-Bearing force. The concentrated force was applied by means of a Bearing plate, which acted across the full flange width of the section. The parameters varied in the tests included (1) the Bearing length; (2) the slEnderness of the member; and (3) the shape of the section [rectangular hollow sections (RHS) or square hollow sections (SHS)]. The results are compared with existing American Australian, Canadian, and European design formulas. The results are also compared with the formulas given by the writers, which were based on tests of SHS and RHS sections under interior Bearing force. A design model is proposed for SHS and RHS sections under End-Bearing force. The reliability analysis method is used to calibrate the existing and proposed design formulas.

Bijan Samali - One of the best experts on this subject based on the ideXlab platform.

  • RETRACTED: Seismic response of mid-rise buildings on shallow and End-Bearing pile foundations in soft soil
    Soils and Foundations, 2014
    Co-Authors: Aslan S. Hokmabadi, Behzad Fatahi, Bijan Samali
    Abstract:

    This article has been retracted: please see Elsevier Policy on Article Withdrawal (http://www.elsevier.com/locate/withdrawalpolicy).The Editorial committee has carefully reviewed this article and 'Assessment of soil–pile–structure interaction influencing seismic response of mid-rise buildings sitting on floating pile foundations' by Aslan S. Hokmabadi in Computers and Geotechnics 55 (2014) 172–186 (10.1016/j.compgeo.2013.08.011). Although there was a difference in the pile type of "floating pile" and "End-Bearing pile" in both papers, each paper contained similar contents in most parts. Therefore the Editorial committee has decided to retract the article “Seismic response of mid-rise buildings on shallow and End-Bearing pile foundations in soft soil” from "Soils and Foundations".The authors have not properly referenced and acknowledged their own previously published work in this paper, and they sincerely apologize for the inconvenience caused by this issue

Kui Hua Wang - One of the best experts on this subject based on the ideXlab platform.

  • Torsional vibration of an End Bearing pile embedded in radially inhomogeneous saturated soil
    Computers and Geotechnics, 2019
    Co-Authors: Yufeng Gao, Kui Hua Wang
    Abstract:

    Abstract This paper is concerned with the torsional dynamic response of an End Bearing pile embedded in radially inhomogeneous saturated soil. The soil is simulated using Biot’s two-phase linear theory and its radial inhomogeneity due to the construction disturbance effect is considered by radially gradual variation of soil parameters. Then, the governing equations for the pile–soil system are established to derive an analytical solution for the torsional vibration of the pile. The reliability of the proposed solution is verified and parametric studies are performed to analyze the torsional vibration characteristics of the pile.

  • New Method to Predict the Bearing Capacity and End-Bearing Ratio of Friction-Type Long Pile
    Advanced Materials Research, 2014
    Co-Authors: Zheng Qian, Kui Hua Wang
    Abstract:

    The purpose of this paper was to predict piles’ Bearing capacities and End-Bearing ratios. Finite-Element-Method was derived to establish the simulation models. The studying processes were firstly to set some unified pile top settlements and then to vary pile diameters to obtain the results, thus the performance of pile could be observed. It was found that closing to ultimate state, loads under the unified settlements were approximately linear to pile diameters, and equivalent unit side-friction forces were nearly constant, and the End-Bearing ratios were piecewise linear to pile diameters. Based on these findings, predictive formulas were established. Following the formulas, while piles’ Bearing capacities of two certain diameters and one End-Bearing ratio of them were known, the Bearing capacities, side-friction forces and End resistances of other concerned diameters could be predicted.

  • dynamic torsional response of an End Bearing pile in transversely isotropic saturated soil
    Journal of Sound and Vibration, 2009
    Co-Authors: Kui Hua Wang, Zhiqing Zhang, Chin Jian Leo, Kanghe Xie
    Abstract:

    Abstract The dynamic response of an End Bearing pile embedded in transversely isotropic saturated soil and subjected to a time-harmonic torsional loading is investigated. Based on the dynamic wave equations of saturated soil and the stress–strain relationships of transversely isotropic medium, the dynamic governing equations of the transversely isotropic saturated soil are derived in cylindrical coordinates and the pile is modeled using one-dimensional elastic theory. At first, the torsional response of the soil layer is solved by using the separation of variables technique. Then by utilizing the boundary and continuity conditions of the pile–soil system, the dynamic response of the pile is obtained in a closed form in the frequency domain. By virtue of inverse Fourier transform and convolution theorem, a quasi-analytical solution for the velocity response of a pile subjected to a semi-sine wave exciting torque is obtained in the time domain. Finally, a parametric study has been undertaken to investigate the influence of the soil anisotropy on the torsional vibration characteristics of the pile, and the results obtained are presented in this paper.

  • dynamic torsional response of an End Bearing pile in saturated poroelastic medium
    Computers and Geotechnics, 2008
    Co-Authors: Kui Hua Wang, Zhiqing Zhang, Chin Jian Leo, Kanghe Xie
    Abstract:

    Abstract A comprehensive analytical solution is developed in this paper to investigate the torsional vibration of an End Bearing pile embedded in a homogeneous poroelastic medium and subjected to a time-harmonic torsional loading. The poroelastic medium is modeled using Biot’s two-phased linear theory and the pile using one-dimensional elastic theory. By using the separation of variables technique, the torsional response of the soil layer is solved first. Then based on perfect contact between the pile and soil, the dynamic response of the pile is obtained in a closed form. Numerical results for torsional impedance of the soil layer are presented first to portray the influence of wave modes, slEnderness ratio, pile–soil modulus ratio and poroelastic properties. A comparison with the plane strain theory is performed. The selected numerical results are obtained to analyze the influence of the major parameters on the torsional impedance at the level of the pile head. Finally, the dynamic torsional impedance of this study is compared with that for floating pile in elastic soil.

Hany El Naggar - One of the best experts on this subject based on the ideXlab platform.

  • Numerical Study on Buckling of End-Bearing Piles in Soft Soil Subjected to Axial Loads
    Geotechnical and Geological Engineering, 2018
    Co-Authors: Walid El Kamash, Hany El Naggar
    Abstract:

    End Bearing piles are commonly used as an efficient foundation system for supporting structures built on soft soils. Although, soft soils can provide some confinement to the pile not to be treated as an Euler column, the excessive large lateral movement may cause the soil to fail under axial loads before reaching the buckling load. Moreover, the buckling resistance of End Bearing piles under loading–unloading conditions may be influenced since residual stresses in the structural elements of the piles and the surrounding soil exist even after removing the load. In addition, buckling of End Bearing piles under extreme loading conditions of loading–unloading nature may result in residual stresses in the structural elements of the piles and the surrounding soil even after removing the load. In this paper, a 3-D numerical model utilizing the finite difference method was developed to study buckling behavior of End Bearing piles. First the model’s calculated buckling load was verified against the theoretical solution for an idealized Euler’s case. Then, a comprehensive parametric study was performed to understand the effect of both the soil stiffness and the flexural stiffness of the pile on the behavior of buckled End Bearing piles under both loading and unloading conditions. The results showed that both the lateral stiffness of the supporting soil as well as the flexural stiffness of the pile have a significant impact on the buckling length and hence the buckling load. The flexural stiffness of the pile should match (be relatively close) the stiffness of the soil in order to avoid high values of lateral displacement of the pile’s axis.