Study on shear behavior of a novel PC wallboard alveolar-type joint
In order to study the interface shear behavior of a novel PC wallboard alveolar-type joint suitable for low multilayer structure,2 series of PC wallboard specimens(8 in total)with the novel joint were designed and fabricated,then monotonic shear loading test and finite element analysis(FEA)of the extended parameters were carried out.The effects of the main test parameters including axial compression ratio,materials,as well as the construction of the alveolar-type joint on interface shear behavior were discussed,respectively.Furthermore,the formula of shear bearing capacity was proposed,and the corresponding shear force-slip model of the novel joint interface was created.The results show that the axial compression ratio has a significant effect on the joint failure mode and shear bearing capacity,the crack development is more sufficient with the increase of axial compression ratio,and there exist local concrete spalling or even crushing.At the same time,the relationship between joint shear capacity and axial compression ratio is approximately linear.Improving the strength of the bonding surface mortar can greatly improve the shear bearing capacity of the joint.The shear bearing capacity of specimens with high-strength mortar increases by 57.2%compared with that of the ordinary mortar.Reasonable keyway structure can effectively improve the shear bearing capacity of the joint.Compared with the traditional straight joint,the shear bearing capacity of the specimens with a depth of 50 mm and inclined chamfering angle of 11.3° increases by 16.5%.The calculation results of shear bearing capacity obtained from the proposed formula are in good agreement with the test results.The proposed shear-slip model of the novel joint interface can predict the shear behavior of the joint correctly.
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