To investigate the tensile properties of high strength steel T-stubs at high temperature

we carried out tensile tests on 11 T-stubs at ambient temperature and 17 T-stubs at high temperature

including T-stubs made of Q355

Q460

Q690

S690

and S960 with different strengths under various high temperature conditions

i.e. 0

0

500

and 600 ℃. The initial tensile stiffness

tensile capacity

and failure modes of T-stubs under different test conditions were obtained. The test results were compared with the theoretical calculation results of European and Chinese codes to verify the applicability of the codes for high strength steel T-stubs. Moreover

the effects of flange strength

flange thickness

bolt strength

bolt diameter

bolt position

and high temperature on the tensile properties of T-stubs were analyzed. Results showed that the European code and Chinese code overestimated the initial tensile stiffness of T-stubs at high temperature

and were conservative in terms of tensile load-bearing capacity. Compared with ordinary steel T-stubs

the high strength steel T-stubs with thin-walled flange had better deformation capacity while maintaining the same load-bearing capacity. When the ratio of the distance between bolt and web to the distance between bolt and flange was less than 1

increasing the distance between the bolt and the web could significantly reduce the initial tensile stiffness and tensile load-bearing capacity of the T-stubs. The increase in the bolt diameter improved the initial tensile stiffness of T-subs

while the bolt strength had little influence on the initial tensile stiffness. The research results can provide experimental basis for the fire-resistance design of high strength steel end-plate connections and their equivalent T-stubs

which are reference for the revision of relevant design codes.