Study on Unidirectional Tensile Mechanical Properties of C-type Slot Connection Under the Influence of Different Grouting Materials
To enhance the construction efficiency of prefabricated longitudinal steel bar connections,a C-type split-slot connection method is proposed.Six specimens are fabricated for unidirectional tensile testing to observe their failure patterns,the load-displacement curve and strain development process of the specimens are investiga-ted,and the influence of different grouting materials on the mechanical properties of the specimens are analyzed.The results indicate that there are three primary failure modes for C-type slots:(1)Specimens with low grouting materials strength experience either steel bar failure with anchor plate or slot buckling after grouting materials crushing;(2)Specimens with high grouting materials strength undergo separation of steel bars with anchor plates.The axial strain in the slot is tensile while the circumferential strain is compressive.The slot strains in all specimens are smaller than those in reinforcement with anchor plates.Even when yielding occurs in steel bars with anchor plates,the slots remain within their elastic range,suggesting that the tested C-type slots possess a cer-tain safety margin and meet strength requirements.If it can be ensured that extrusion does not damage grouting material within C-type slots,this new connection method can satisfy specification requirements.Finally,based on local compression formulae for concrete,a bearing capacity formula for C-type slotted steel bars is derived.The theoretical calculation results align well with experimental findings and provide fitting tables correlating different strengths of grout materials and diameters of steel bars with anchor plates for convenient engineering applications.
prefabricated buildingsteel bar connectionC-shaped groove connectionuniaxial tensiongrou-ting material
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