Field Test of Rectangular Concrete Filled Steel Tubular Composite Truss Bridge with Continuous Rigid System

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China Journal of Highway and Transport ›› 2018, Vol. 31 ›› Issue (5) : 53-62.

LIU Yong-jian¹, MA Yin-ping¹, TIAN Zhi-juan¹, YUAN Zhuo-ya^1,2, XIONG Zhi-hua³, YANG Jian⁴

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The main girder of the rectangular concrete-filled steel tubular (CFST) composite truss bridge consists of a rectangular CFST truss and concrete deck. To investigate the mechanical behavior of this new bridge type, field tests were performed on the first rectangular CFST composite truss bridge in China. The span arrangement of the testing bridge was (24+40+24) m, and the structural type of bridge was a continuous rigid system. 3 trucks of weight 400 kN were used as the loading vehicles, and 3 test conditions with 12 loading steps were deployed. The whole mechanical behavior of the bridge, the rectangular CFST members, and the effective width of concrete deck were investigated. The test results show that the tested data of the axial force strain for the controlled members and the load displacement had significant linear relationships under overloading conditions with the load efficiency ratio ranging from 1.90-3.05; the testing bridge remained well within the elastic stage during the entire loading process. The measured load distribution between the in-filled concrete and steel tube for the compressing CFST member in the lower chord is similar to the relationship of the axial compression stiffness ratio. The longitudinal perfobond leister stiffeners (PBL stiffeners) were arranged in the steel tube of the CFST members, subsequently the concrete tenon was formed at the perfobond area and this could greatly increase the axial tensile stiffness of the rectangular CFST member to 80% of the compression member's stiffness. The tested effective width of the concrete deck between the chords coincides well with the value presented in the existing literatures. The shear lag in the concrete slab is more obvious on the truss joint compared to that at the midsection of the segment.

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bridge engineering / composite truss bridge / field test / rectangular CFST / PBL stiffener

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LIU Yong-jian, MA Yin-ping, TIAN Zhi-juan, YUAN Zhuo-ya, XIONG Zhi-hua, YANG Jian. Field Test of Rectangular Concrete Filled Steel Tubular Composite Truss Bridge with Continuous Rigid System[J]. China Journal of Highway and Transport, 2018, 31(5): 53-62

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2017-10-15	2018-05-20
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2018-06-04

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