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This paper experimentally studies the seismic behavior of high strength bolted connections with slot bolt holes at ambient and elevated temperatures. A total of 6 specimens varying in bolt diameters, pretensions, temperatures are designed and tested. The results show that the connections with slot holes at both ambient and elevated temperatures have good energy dissipation capacity. It is found that connections with M30 bolts have better energy dissipation capacity and load-bearing capacity than those with M20 bolts, due to the larger friction force and sliding distance in M30 bolts since they have a larger pretention and wider slot hole. The sliding forces of the connections decrease with the increase of the number of loops. The sliding force decrease by about 50% after 60 loops at elevated temperatures, compared with 35% at ambient temperature. While the ultimate bearing capacity of the connections does not decrease much. The friction coefficient and area of hysteresis curves decrease in a similar trend by about 40% after the first 30 loops. After 60 loops, they are reduced to 40% and 50% of their initial values for the connections with M20 bolts and M30 bolts, respectively. The experimental results indicate the potential application of the connections with slot bolt holes for a dual-function component in a structure to simultaneously provide stiffness and energy dissipation capacity.

SEISMIC BEHAVIOR OF BOLTED CONNECTIONS WITH SLOT BOLT HOLES AT AMBIENT AND ELEVATED TEMPERATURE