The Experts below are selected from a list of 129 Experts worldwide ranked by ideXlab platform
Licong Zhong - One of the best experts on this subject based on the ideXlab platform.
-
experimental study on shear behavior of high strength Bolt connection in prefabricated steel concrete composite beam
Composites Part B-engineering, 2019Co-Authors: Yujie Zhang, Bingcong Chen, Airong Liu, Junping Zhang, Yang Wang, Licong ZhongAbstract:Abstract In order to study the shear behavior of high strength Bolt connections in a prefabricated steel-concrete composite beam, eleven push-out specimens with different parameters were tested. In the tests, two failure modes of the specimens were observed. For the specimens with the concrete strength of higher than 50 MPa and the Bolt Diameter of smaller than 20 mm, the Bolts failed in a shear fracture. For the other specimens, the concrete near the Bolts cracked with the Bolts bending yield failure. The load-slip curves of the connectors had four distinctive stages corresponding to four different loading states of the tested Bolts. The shear bearing capacity of the Bolted connector was found to be mainly depended on the Bolt Diameter, the Bolt tensile strength and the concrete strength. Finite element models verified by the experimental results were also developed, and used to conduct parametric analyses for investigating the effects of the Bolt pretension, the Bolt Diameter, the Bolt tensile strength and the compressive strength of concrete on the failure mode, the load-slip characteristics and the ultimate strength of the Bolt connectors. Finally, based on the experiment results and FEA, design formulas for predicting the shear bearing capacity of Bolt connections under different failure modes were proposed, which could be used in the design of high strength Bolt connections in composite structures.
Yujie Zhang - One of the best experts on this subject based on the ideXlab platform.
-
experimental study on shear behavior of high strength Bolt connection in prefabricated steel concrete composite beam
Composites Part B-engineering, 2019Co-Authors: Yujie Zhang, Bingcong Chen, Airong Liu, Junping Zhang, Yang Wang, Licong ZhongAbstract:Abstract In order to study the shear behavior of high strength Bolt connections in a prefabricated steel-concrete composite beam, eleven push-out specimens with different parameters were tested. In the tests, two failure modes of the specimens were observed. For the specimens with the concrete strength of higher than 50 MPa and the Bolt Diameter of smaller than 20 mm, the Bolts failed in a shear fracture. For the other specimens, the concrete near the Bolts cracked with the Bolts bending yield failure. The load-slip curves of the connectors had four distinctive stages corresponding to four different loading states of the tested Bolts. The shear bearing capacity of the Bolted connector was found to be mainly depended on the Bolt Diameter, the Bolt tensile strength and the concrete strength. Finite element models verified by the experimental results were also developed, and used to conduct parametric analyses for investigating the effects of the Bolt pretension, the Bolt Diameter, the Bolt tensile strength and the compressive strength of concrete on the failure mode, the load-slip characteristics and the ultimate strength of the Bolt connectors. Finally, based on the experiment results and FEA, design formulas for predicting the shear bearing capacity of Bolt connections under different failure modes were proposed, which could be used in the design of high strength Bolt connections in composite structures.
Tomas Ireman - One of the best experts on this subject based on the ideXlab platform.
-
Design of composite structures containing Bolt holes and open holes
2000Co-Authors: Tomas IremanAbstract:This thesis is concerned with stress analysis and strengthprediction in composite laminates containing Bolt holes andopen holes. It covers both two- and three-dimensional analyses,and experiments have been carried out to determine criteriaparameters and to validate the analysis methods.The objective of the work on two-dimensional analysismethods has been to develop accurate and cost-efficient stressanalysis and failure prediction methods valid for complexloading conditions. Both the finite element method and a methodbased on Lekhnitskiis complex stress functions have beenused to determine the stress distribution around the hole. Inthe case of Bolted laminates, the frictionless contact betweenthe Bolt and the hole has been taken into account. Differentfailure criteria, including the Point Stress Criterion (PSC)and the Damage Zone Criterion (DZC) have been used to predictthe strength of test specimens subjected to complex loadingconditions. In the case of Bolted laminates, simple failurecriteria for preliminary design are proposed. The validity ofthese criteria is demonstrated on multi-fastener tension- andshear-loaded test specimens. A comprehensive test programme wascarried out to establish criteria parameters and to generatedata to validate the stress analysis and strength predictionunder complex loading conditions. A special test fixture wasdesigned for this purpose. Good agreement was found betweenpredicted and measured results.The objective of the work on three-dimensional methodshas been to develop tools for three- dimensional stress andfailure analyses and to study the effect of various factors onthe strength of single-lap joints. An experimental programmewas conducted to characterize the failure mechanisms and tomeasure deformation, strain, and bending effects. Athree-dimensional finite element model of a Bolted single-lapjoint has been developed to determine the non-uniform stressdistribution through the thickness of the laminate in thevicinity of the hole. The model was validated against measuredstrains and displacements from the experimental programme. Theagreement between predicted and experimental results wasgenerally good. In the failure characterisation part of theexperimental programme, it was found that the failure of thejoints was dominated by kinking. A failure analysis procedurefor the prediction of bearing failure dominated by kinking hasbeen developed. In this procedure, failure is predicted using aquadratic failure criterion evaluating fibre stress andtransverse shear stress at a characteristic distance from theedge of the Bolt hole. Experimental results were used tovalidate the analysis procedure and good agreement was foundbetween predicted and experimental failure loads. The analysisprocedure were then used study the effect of eight differentparameters which affect the strength of Bolted compositelaminates. The parameters studied were: laminate thickness,lay-up, Bolt Diameter, Bolt configuration (countersunk orprotruding head), friction, clamping force, clearance andlateral support. The parametric study was organised as areduced two-level factorial test. The results from theparametric study show that laminate thickness, friction,clamping force and Bolt configuration are the parameters whichhave the strongest influence on the strength of the joints.Key words:Composite, laminate, Bolted joints, openholes, static strength, failure characterization, damage,complex loading, stress analysis, three-dimensional analysis,contact analysis, failure prediction, factorial test
-
three dimensional stress analysis of Bolted single lap composite joints
Composite Structures, 1998Co-Authors: Tomas IremanAbstract:Abstract A three-dimensional finite element model of Bolted composite joints has been developed to determine non-uniform stress distributions through the thickness of composite laminates in the vicinity of a Bolt hole. An experimental programme was conducted to measure deformations, strains, and Bolt load on test specimens for validation of the numerical model developed. Strains in the radial direction at different radii and angles were measured in the vicinity of the Bolt hole at the shear plane between the plates. The degree of secondary bending in the joints was determined from strain measurements on both sides of the laminate at certain points. In the experiments, a number of parameters such as laminate layup, laminate thickness, Bolt Diameter, Bolt type, clamping force and lateral support were varied. Each specimen configuration was analysed using the three-dimensional finite element model. Generally, comparison between computed and experimental results showed good agreement.
Yang Wang - One of the best experts on this subject based on the ideXlab platform.
-
experimental study on shear behavior of high strength Bolt connection in prefabricated steel concrete composite beam
Composites Part B-engineering, 2019Co-Authors: Yujie Zhang, Bingcong Chen, Airong Liu, Junping Zhang, Yang Wang, Licong ZhongAbstract:Abstract In order to study the shear behavior of high strength Bolt connections in a prefabricated steel-concrete composite beam, eleven push-out specimens with different parameters were tested. In the tests, two failure modes of the specimens were observed. For the specimens with the concrete strength of higher than 50 MPa and the Bolt Diameter of smaller than 20 mm, the Bolts failed in a shear fracture. For the other specimens, the concrete near the Bolts cracked with the Bolts bending yield failure. The load-slip curves of the connectors had four distinctive stages corresponding to four different loading states of the tested Bolts. The shear bearing capacity of the Bolted connector was found to be mainly depended on the Bolt Diameter, the Bolt tensile strength and the concrete strength. Finite element models verified by the experimental results were also developed, and used to conduct parametric analyses for investigating the effects of the Bolt pretension, the Bolt Diameter, the Bolt tensile strength and the compressive strength of concrete on the failure mode, the load-slip characteristics and the ultimate strength of the Bolt connectors. Finally, based on the experiment results and FEA, design formulas for predicting the shear bearing capacity of Bolt connections under different failure modes were proposed, which could be used in the design of high strength Bolt connections in composite structures.
Junping Zhang - One of the best experts on this subject based on the ideXlab platform.
-
experimental study on shear behavior of high strength Bolt connection in prefabricated steel concrete composite beam
Composites Part B-engineering, 2019Co-Authors: Yujie Zhang, Bingcong Chen, Airong Liu, Junping Zhang, Yang Wang, Licong ZhongAbstract:Abstract In order to study the shear behavior of high strength Bolt connections in a prefabricated steel-concrete composite beam, eleven push-out specimens with different parameters were tested. In the tests, two failure modes of the specimens were observed. For the specimens with the concrete strength of higher than 50 MPa and the Bolt Diameter of smaller than 20 mm, the Bolts failed in a shear fracture. For the other specimens, the concrete near the Bolts cracked with the Bolts bending yield failure. The load-slip curves of the connectors had four distinctive stages corresponding to four different loading states of the tested Bolts. The shear bearing capacity of the Bolted connector was found to be mainly depended on the Bolt Diameter, the Bolt tensile strength and the concrete strength. Finite element models verified by the experimental results were also developed, and used to conduct parametric analyses for investigating the effects of the Bolt pretension, the Bolt Diameter, the Bolt tensile strength and the compressive strength of concrete on the failure mode, the load-slip characteristics and the ultimate strength of the Bolt connectors. Finally, based on the experiment results and FEA, design formulas for predicting the shear bearing capacity of Bolt connections under different failure modes were proposed, which could be used in the design of high strength Bolt connections in composite structures.