The Experts below are selected from a list of 51138 Experts worldwide ranked by ideXlab platform

Otávio Rangel De Oliveira E Cavalcante - One of the best experts on this subject based on the ideXlab platform.

  • Truss-type shear connector for Composite Steel-concrete beams
    Construction and Building Materials, 2018
    Co-Authors: Luciano M. Bezerra, Wallison Carlos De Sousa Barbosa, Jorge Bonilla, Otávio Rangel De Oliveira E Cavalcante
    Abstract:

    Abstract Shear connectors are important in Composite Steel-concrete beams. This work presents a new connector, named truss-type shear connector. This connector is an alternative to replace stud bolt in special situation. The connector’s geometry was conceived aiming at low cost, easy execution, high resistance, and efficiency concerning slipping and uplift. Six specimens were constructed for push-out tests comparing this alternative connector with stud bolts. The behavior of the specimens was investigated for collapse, slipping and uplift. Experimental results were compared against numerical FE simulation showing good agreement and providing a global view of the truss-type shear connector behavior and its viability.

  • V-shaped shear connector for Composite Steel-concrete beam
    Journal of Constructional Steel Research, 2018
    Co-Authors: Luciano M. Bezerra, Otávio Rangel De Oliveira E Cavalcante, Latif Chater, Jorge Bonilla
    Abstract:

    Abstract Shear connectors are fundamental components for Composite Steel-concrete beams. Their function is to bring about a good degree of interaction between the concrete slab and the Steel profile. The stud bolt connector is currently the most adopted solution, mainly because of its high productivity and practicability on construction sites. However, there are situations where stud bolts or the appropriate equipment for their application may not be available. Alternative shear connectors can substitute stud bolts. In this article, a new V-shaped shear connector is proposed. It was conceived to confine concrete in a larger frontal contact area and be easy to install and construct. With more contact area, the proposed connector distributes the shear force more uniformly, avoiding high stress concentration compared to the stud bolt option. The V-shaped connector has a higher moment of inertia. It is less flexible than stud bolts and U-connectors under bending. In this research, different V-shaped connectors, with varying thicknesses, are studied experimentally and numerically with push-out tests and FE modeling. The results are compared to standard stud bolts and show that the proposed V-shaped connector may be utilized as an alternative shear connector in Composite Steel-concrete beams. An equation for the shear resistance prediction of V-connectors is also developed.

Olivia Mirza - One of the best experts on this subject based on the ideXlab platform.

  • Behaviour and design of Composite Steel and precast concrete transom for railway bridge application
    Structures, 2019
    Co-Authors: Olivia Mirza, Andrew Talos, Matthew J Hennessy, Brendan Kirkland
    Abstract:

    Abstract Currently most railway bridges in Australia require the frequent replacement of the timber transoms that reside in the railway system. Composite Steel and precast reinforced concrete transoms have been proposed as the replacement for the current timber counterparts. This paper outlines the structural benefits of Composite Steel-concrete transoms for ballastless tracks when retrofitted to existing railway Steel bridges. However, in existing studies, it is found that there is little investigation into the effect of derailment loading on reinforced concrete transoms. Therefore, this paper provides an investigation of derailment impact loading on precast reinforced concrete transoms. The paper herein investigates the derailment impact loading of a train through experimental testing and numerical analysis of conventional reinforced concrete transoms. The paper also evaluates the potential use of 3 different shear connectors; welded shear studs, Lindapter bolts and Ajax bolts. The results of the experimental tests and finite element models are used to determine whether each transom is a viable option for the replacement of the current timber transoms on the existing bridges in Australia and whether they provide a stronger and longer lasting solution to the current transom problem.

  • Behaviour and Design of Composite Steel and Precast Concrete Transom for Railway Bridges Application
    Proceedings 12th international conference on Advances in Steel-Concrete Composite Structures - ASCCS 2018, 2018
    Co-Authors: Olivia Mirza, Andrew Talos, Matthew J Hennessy, Brendan Kirkland
    Abstract:

    Currently most railway bridges in Australia require the replacement of the timber transoms that reside in the railway system. Composite Steel and precast reinforced concrete transoms have been proposed as the replacement for the current timber counterparts. This paper outlines the structural benefits of Composite Steel-concrete transoms for ballastless tracks when retrofitted to existing railway Steel bridges. However, in existing studies, it is found that there is little investigation into the effect of derailment loading on reinforced concrete transoms. Therefore, this paper provides an investigation of derailment impact loading on precast reinforced concrete transoms. The paper herein investigates the derailment impact loading of a train through experimental testing and numerical analysis of conventional reinforced concrete transoms. The paper also evaluates the potential use of 3 different shear connectors; welded shear studs, Lindapter bolts and Ajax bolts. The results of the experimental tests and finite element models are used to determine whether each transom is a viable option for the replacement of the current timber transoms on the existing bridges in Australia and whether they provide a stronger and longer lasting solution to the current transom problem.

  • behaviour of headed stud shear connectors for Composite Steel concrete beams at elevated temperatures
    Journal of Constructional Steel Research, 2009
    Co-Authors: Olivia Mirza
    Abstract:

    Abstract The behaviour of Composite Steel–concrete beams at elevated temperatures is an important problem. A three-dimensional push test model is developed herein with a two-dimensional temperature distribution field based on the finite element method (FEM) and which may be applied to Steel–concrete Composite beams. The motivation for this paper is to increase the awareness of the structural engineering community to the concepts behind Composite Steel–concrete structural design for fire exposure. The behaviour of reinforced concrete slabs under fire conditions strongly depends on the interaction of the slabs with the surrounding elements which include the structural Steel beam, Steel reinforcing and shear connectors. This study was carried out to consider the effects of elevated temperatures on the behaviour of Composite Steel–concrete beams for both solid and profiled Steel sheeting slabs. This investigation considers the load–slip relationship and ultimate load behaviour for push tests with a three-dimensional non-linear finite element program ABAQUS. As a result of elevated temperatures, the material properties change with temperature. The studies were compared with experimental tests under both ambient and elevated temperatures. Furthermore, for the elevated temperature study, the models were loaded progressively up to the ultimate load to illustrate the capability of the structure to withstand load during a fire. It is concluded that finite element analysis showed that the shear connector strength under fire exposure was very sensitive. It is also shown that profiled Steel sheeting slabs exhibit greater fire resistance when compared with that of a solid slab as a function of their ambient temperature strength.

Sheng Peng - One of the best experts on this subject based on the ideXlab platform.

  • Analysis of the seismic behavior of CFRP-strengthened seismic-damaged Composite Steel-concrete frame joints
    Journal of Building Engineering, 2020
    Co-Authors: Sheng Peng, Xiaoqiang Liu, Chenfei Wang
    Abstract:

    Abstract An experimental investigation was conducted to examine the seismic behavior of three seismic-damaged Composite Steel-concrete frame joints strengthened with carbon fiber-reinforced polymer (CFRP) sheets, as well as of one original Composite Steel-concrete frame joint. Effects of the degree of seismic damage and the CFRP reinforcement on shear capacity, ductility, energy dissipation, and stiffness degradation were critically researched. Based on an existing code, an expression to predict the shear strength of seismic-damaged Composite Steel-concrete frame joints strengthened with CFRP is presented; the influence of the degree of seismic damage and amount of CFRP on the shear strength is considered in this expression. Results of the proposed expression and the test results were compared. The results revealed that the ultimate bearing capacity, ultimate displacement, and ductility of the specimens improved after CFRP reinforcement. There was good agreement between predicted results from the shear strength model and the test results with regard to the degree of seismic damage and amount of CFRP.

  • study on seismic behavior of encased Steel jacket strengthened earthquake damaged Composite Steel concrete columns
    Journal of building engineering, 2018
    Co-Authors: Sheng Peng, Jie Deng
    Abstract:

    Abstract In order to study the seismic behavior of earthquake-damaged Composite Steel-concrete columns strengthened by enveloped Steel, based on current design codes, four Composite Steel-concrete column models were designed and manufactured. Destructive tests on the models under low-cyclic loading were then carried out. The feasibility and effectiveness of earthquake-damaged columns strengthened by enveloped Steel and the reinforcement effect on different levels of seismic damage were studied. The results show that enveloped-Steel-strengthened earthquake-damaged Composite Steel-concrete columns meet the strong column-weak beam requirement of seismic design, and the failure mode of all the columns was in bending. The performance of the rehabilitated columns can reach or even exceed the level of their original seismic performance before seismic damage. Composite Steel-concrete frame columns strengthened by enveloped Steel were also simulated using the finite element (FE) analysis software ABAQUS. The analytical study was conducted and compared with the experimental results, and it was basically consistent with the experimental data.

Brendan Kirkland - One of the best experts on this subject based on the ideXlab platform.

  • Behaviour and design of Composite Steel and precast concrete transom for railway bridge application
    Structures, 2019
    Co-Authors: Olivia Mirza, Andrew Talos, Matthew J Hennessy, Brendan Kirkland
    Abstract:

    Abstract Currently most railway bridges in Australia require the frequent replacement of the timber transoms that reside in the railway system. Composite Steel and precast reinforced concrete transoms have been proposed as the replacement for the current timber counterparts. This paper outlines the structural benefits of Composite Steel-concrete transoms for ballastless tracks when retrofitted to existing railway Steel bridges. However, in existing studies, it is found that there is little investigation into the effect of derailment loading on reinforced concrete transoms. Therefore, this paper provides an investigation of derailment impact loading on precast reinforced concrete transoms. The paper herein investigates the derailment impact loading of a train through experimental testing and numerical analysis of conventional reinforced concrete transoms. The paper also evaluates the potential use of 3 different shear connectors; welded shear studs, Lindapter bolts and Ajax bolts. The results of the experimental tests and finite element models are used to determine whether each transom is a viable option for the replacement of the current timber transoms on the existing bridges in Australia and whether they provide a stronger and longer lasting solution to the current transom problem.

  • Behaviour and Design of Composite Steel and Precast Concrete Transom for Railway Bridges Application
    Proceedings 12th international conference on Advances in Steel-Concrete Composite Structures - ASCCS 2018, 2018
    Co-Authors: Olivia Mirza, Andrew Talos, Matthew J Hennessy, Brendan Kirkland
    Abstract:

    Currently most railway bridges in Australia require the replacement of the timber transoms that reside in the railway system. Composite Steel and precast reinforced concrete transoms have been proposed as the replacement for the current timber counterparts. This paper outlines the structural benefits of Composite Steel-concrete transoms for ballastless tracks when retrofitted to existing railway Steel bridges. However, in existing studies, it is found that there is little investigation into the effect of derailment loading on reinforced concrete transoms. Therefore, this paper provides an investigation of derailment impact loading on precast reinforced concrete transoms. The paper herein investigates the derailment impact loading of a train through experimental testing and numerical analysis of conventional reinforced concrete transoms. The paper also evaluates the potential use of 3 different shear connectors; welded shear studs, Lindapter bolts and Ajax bolts. The results of the experimental tests and finite element models are used to determine whether each transom is a viable option for the replacement of the current timber transoms on the existing bridges in Australia and whether they provide a stronger and longer lasting solution to the current transom problem.

Luciano M. Bezerra - One of the best experts on this subject based on the ideXlab platform.

  • Truss-type shear connector for Composite Steel-concrete beams
    Construction and Building Materials, 2018
    Co-Authors: Luciano M. Bezerra, Wallison Carlos De Sousa Barbosa, Jorge Bonilla, Otávio Rangel De Oliveira E Cavalcante
    Abstract:

    Abstract Shear connectors are important in Composite Steel-concrete beams. This work presents a new connector, named truss-type shear connector. This connector is an alternative to replace stud bolt in special situation. The connector’s geometry was conceived aiming at low cost, easy execution, high resistance, and efficiency concerning slipping and uplift. Six specimens were constructed for push-out tests comparing this alternative connector with stud bolts. The behavior of the specimens was investigated for collapse, slipping and uplift. Experimental results were compared against numerical FE simulation showing good agreement and providing a global view of the truss-type shear connector behavior and its viability.

  • V-shaped shear connector for Composite Steel-concrete beam
    Journal of Constructional Steel Research, 2018
    Co-Authors: Luciano M. Bezerra, Otávio Rangel De Oliveira E Cavalcante, Latif Chater, Jorge Bonilla
    Abstract:

    Abstract Shear connectors are fundamental components for Composite Steel-concrete beams. Their function is to bring about a good degree of interaction between the concrete slab and the Steel profile. The stud bolt connector is currently the most adopted solution, mainly because of its high productivity and practicability on construction sites. However, there are situations where stud bolts or the appropriate equipment for their application may not be available. Alternative shear connectors can substitute stud bolts. In this article, a new V-shaped shear connector is proposed. It was conceived to confine concrete in a larger frontal contact area and be easy to install and construct. With more contact area, the proposed connector distributes the shear force more uniformly, avoiding high stress concentration compared to the stud bolt option. The V-shaped connector has a higher moment of inertia. It is less flexible than stud bolts and U-connectors under bending. In this research, different V-shaped connectors, with varying thicknesses, are studied experimentally and numerically with push-out tests and FE modeling. The results are compared to standard stud bolts and show that the proposed V-shaped connector may be utilized as an alternative shear connector in Composite Steel-concrete beams. An equation for the shear resistance prediction of V-connectors is also developed.