钢桥管桁架新型螺栓连接节点抗拉性能试验研究

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中图分类号：TU391 文献标志码：A 文章编号：1008-0562（2026）01-0073-09

Experimental study on tensile performance of new bolted joints of steel bridge pipe truss

KANG Long1²，KONG Jie'，WU Yiming'， ZHANG Dingwen²，SUNLelel，3* （1.YantaiResearch Institute，Harbin Engineering University，Yantai 264ooo，China;2.China Railway Shanhaiguan Bridge Group Company Limited， Qinhuangdao O662oo， China;3.College of Aerospace and CivilEngineering，HarbinEngineeringUniversity，Harbin15ooo1，China）

Abstract： Aiming at the problems of low eficiency and poor mobility of bolt connection of stee pipe truss bridge，a new type of joint structure which can realize fullbolt connection of pipe truss is proposed.Through the combination of model test and theoretical analysis，the tensile performance of the new bolted joint was studied. Theresults show that there are four failure modes of this type of connection： tube wallyield，tube wall yield accompanied bybolt hole punching，end plate yieldand bolt failure.Under the failure modes oftube wallyielding， tube wallyieldingwithboltholepunchingandendplateyielding，thetensileyield strengthandultimate tensile strength of T-shaped square neck unilateralbolt connection with vertical and horizontal bolt holes are lower than thoseof traditional high-strength boltconnection.Fordiffrentfailure modes，thecorresponding design methodof T-shaped square neck unilateral bolt connection is proposed，and the modified Gomes model is recommended to calculate the yield bearing capacityofthe pipe wall.The research conclusions provide a theoretical basis for bolted connections between trussweb membersand square steel chord members.

Keywords：T-shaped square neck unilateral bolt; hollow square steel tube;endplate connection; yield strength; failure modes

0引言螺栓连接因施工高效且无焊接残余应力与高

成本问题，在钢桁架弦腹杆连接中应用广泛[1-2]。（剩余12259字）