Experimental study on ductile moment-resisting beam-to-column glulam connections under monotonic and reversed cyclic loads

To investigate the seismic behavior of beam-to-column glulam connections with glued-in rods joint and steel energy dissipaters, sixteen specimens grouped in nine were prepared to conduct monotonic and reversed cyclic loading tests. The failure modes, experimental phenomena, mechanical behavior, ductility, and energy dissipation of this kind of hybrid glued-in rods (HGIR) connections were evaluated comprehensively and then compared with the simple glued-in rods (SGIR) connections. Test results indicate that there is little difference on the load capacity between HGIR and SGIR connections. Although the elastic lateral stiffness of HGIR connections is lower than that of SGIR connections, the stiffness degradation of the former is smaller than that of the latter. HGIR connections exhibit good ductility with the coefficient of displacement ductility ranging from 2.2 to 5.1. The hysteresis loops of HGIR connections show less pinching effect. The residual deformation is decreased obviously compared to the SGIR connections, which indicates that HGIR connections are in good ability on the energy dissipation and deformation recoveryability. It is found by comparing SGIR connections that, only little difference is shown in the mechanic and seismic performance among the HGIR connections. Its load capacity and stiffness can be controlled at a high level and are designable. The energy dissipation and deformation recoveryability of groups J2, J3 HGIR connections are better than those of groups J4 HGIR connections.