Experimental behaviour of notched timber-concrete connections with glued-in rod under different test configurations and loading protocols
摘要
This paper presents an experimental program on the notched timber-concrete composite (TCC) connections with glued-in rod (GIR) to investigate the effects of test configurations and loading protocols on the shear performance of the connections. A total of twenty-seven notched TCC connections with GIR were designed to experience shear tests. The test results indicated that the double-shear specimens exhibited a higher load capacity but generally a lower slip modulus compared to the single-shear specimens. The load-carrying capacity of both the single- and double- shear specimens showed a non-linear increase to the notch length, specifically the increase of load-carrying capacity slows down once the notch length reaches 100mm. While their coefficients of ductility decreased by 47.5% and 82.2%, respectively, as the notch length increased from 50 to 150 mm. The loading rate showed slight effect on both the failure modes and the load-carrying capacity of specimens but significantly influenced their slip modulus and ductility. The analytical approximations of shear-slip response indicate that the proposed shear-slip response formula can capture the shear-slip behaviour, especially the post-peak behaviour of the connections effectively. Finally, a calculation model was developed for predicting the load-carrying capacity of the connections. The results indicate that the proposed calculation model can predict the shear capacity of the single-shear specimens effectively but underestimates the shear capacity of the double-shear specimens obviously.