Double-composite rectangular truss bridge and its joint analysis

Abstract

Composite truss bridge Joint analysisPerfobond rib Concrete-filled tube a b s t r a c t This paper describes a novel composite tubular truss bridge with concrete slab and concrete-filled rectangular chords. With concrete slab plus truss system and joints reinforced with concrete and Perfobond Leiste rib, double composite truss bridge proved to be a fairly suitable solution in negative moment area. Perfobond Leiste shear connector (PBL) is widely implemented in the composite structure for its outstanding fatigue resistance. In this pilot bridge, Perfobond Leister ribs (PBR) were installed in the truss girder's joints, which played double roles as shear connector and stiffener. An erection method and overall bridge structural analysis were then presented. Typical joints in the pilot bridge were selected to analyze the effect of PBR. Investigation of the effect of PBR in concretefilled tubular joints was elaborated. Comparison has revealed that concrete-filled tubular joints with PBR have much higher constraint capability than joints without PBR. For rectangular tubular truss, the punching shear force of the concrete filled joint with PBR is approximately 43% larger than that of the joint without PBR. Fatigue performance of the joint installed with PBR was improved, which was found through analysis of the stress concentration factor of joint. The PBR installed in the joints mitigated the stress concentration factor in the chord face. Therefore, the advantages of this new type of bridge are demonstrated, including the convenience of construction using rectangular truss, innovative concept of structural design and better global and local performances. © 2015 Periodical Offices of Chang'an University. Production and hosting by Elsevier B.V. on behalf of Owner. This is an open access article under the CC BY-NC-ND license (http:// creativecommons.org/licenses/by-nc-nd/4.0/).

Tension Strength Prediction of Transverse Branch Plate-to-Rectangular Joint with Concrete Filling

“…Experiment on concrete-filled RHS X joint (CRHS) with PBR has indicated that the failure mode presents FM3. The mechanism of this compound failure mode has been owing to the dowel formed by PBR's hole and concrete [14][15]. In terms of the BPRH joint reinforced with both concrete and PBR, tension strength is accordingly improved, which can be inferred from the CRHS joint case.…”

“…The properties of contact pair were defined as: hard contact in normal direction and penalty friction in tangential direction with a friction coefficient of 0.3. PBR was modeled as embeded element and connected to chord simultaneously [14][15]. The 8-noded solid element with reduction integration (C3D8R) was selected.…”

“…Welding Perfobond Leister rib (PBR) in chord face in Tab. 1 and concretefilling have been found to be the significant alternatives to improve tension strength for RHS by the authors [14][15]. When it comes to BPRH joint, PBR's effect may be similar as to the RHS joint.…”

Experimental and numerical analysis of the stress concentration factor for concrete-filled square hollow section Y-joints

“…The dimensions of FE models were based on the joints in Huangyan Bridge (Liu et al, 2015) to ensure that they were typical of those seen in the field. The b 0 and h 0 were kept constant at 400 mm, and t 0 varied from 6.7 to 20 mm.…”

“…This joint is fabricated by welding stiffener plates with holes, namely perfobond ribs (Perfobond Leiste (PBL) in German), to the inner faces of the CFSHS chord along the longitudinal direction. This technique has already been used on the Huangyan Bridge in China (Liu et al, 2015). The SCFs for the CFSHS joint with PBLs have been investigated numerically and experimentally by several researchers.…”