Mechanism analysis of influence of beam and push out loading on stud bearing capacity of steel-concrete structure
Aiming at the different stress behaviors of stud in steel-concrete structure under push-out and beam loading,through numeri-cal analysis and experimental verification,the typical stress performance differences of stud in bearing capacity,stiffness and force trans-mission path under the two loading conditions are studied,and the influence effects and mechanisms such as reserved hole size effect,non-linear gradient effect between stud clusters and single cluster effect are put forward.The calculation formula of shear bearing capacity of single nail under beam loading is established.The results show that the shear bearing capacity of stud under beam loading is lower than that under push out loading,and the shear stiffness is higher than that under push out loading.When the ultimate bearing capacity is loaded by beam,the stress at the root of the stud presents a more significant nonlinear relationship than that under push out loading.The size effect makes the bearing capacity of the bolt in the composite beam slightly higher than that of the push out specimen.The cluster effect is more significant in composite beams,which reduces the bearing capacity of single nail.The gradient effect makes the stress nonlinearity of the bolt root of the composite beam more obvious.Based on the above analysis,the calculation formula of shear capacity of single nail under beam loading considering three effects is proposed.
steel-concrete composite structurepush out loadingbeam loadingshear capacity
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