Bending behaviour of lightweight aggregate concrete-filled steel tube spatial truss beam

Abstract

A lightweight aggregate concrete-filled steel tube (LACFST) spatial truss beam was tested under bending load. The performance was studied by the analysis of the beam deflection and strains in its chords and webs. According to the test results, several assumptions were made to deduce the bearing capacity calculation method based on the force balance of the whole section. An optimal dimension relationship for the truss beam chords was proposed and verified by finite element analysis. Results show that the LACFST spatial truss beam failed after excessive deflection. The strain distribution agreed with Bernoulli-Euler theoretical prediction. The truss beam flexural bearing capacity calculation results matched test evidence with only a 3% difference between the two. Finite element analyses with different chord dimensions show that the ultimate bearing capacity increases as the chord dimensions increase when the chords have a diameter smaller than optimal one; otherwise, it remains almost unchanged as the chord dimensions increase.

Keywords

lightweight aggregate concrete-filled steel tube / spatial truss beam / bending behaviour / bearing capacity

References

[1] GulerS, CopurA, AydoganM A. Comparative study on square and circular high strength concrete-filled steel tube columns [J].. Advanced Steel Construction, 2014, 10(2): 234-247

[2] XiaoJ-z, HuangY-j, SunZ-hui. Seismic behavior of recycled aggregate concrete filled steel and glass fiber reinforced plastic tube columns [J].. Advances in Structural Engineering, 2014, 17(5): 693-707

[3] YuanH-h, DangJ, TetsuhikoA. Behavior of partially concrete-filled steel tube bridge piers under bi-directional seismic excitations [J].. Journal of Constructional Steel Research, 2014, 93: 44-54

[4] RoederC W, LehmanD E, StephensM. Concrete-filled steel tubes for accelerated bridge construction [J].. Transportation Research Record, 2014, 2406: 49-58

[5] MouliM, KhelafiH. Strength of short composite rectangular hollow section columns filled with lightweight aggregate concrete [J].. Engineering Structures, 2007, 29(8): 1791-1797

[6] ElzienA, JiB-h, FuZ-q, HuZ-qing. Behavior of lightweight aggregate concrete filled steel tube columns under eccentric loading [J].. Steel and Composite Structures, 2011, 11(6): 469-488

[7] ChenZ-p, XuJ-j, XueJ-y, SuY-sheng. Performance and calculations of recycled aggregate concrete-filled steel tubular (RACFST) short columns under axial compression [J].. International Journal of Steel Structures, 2014, 14(1): 31-42

[8] MohammadY, BrianU, ZhongT, RemennikovA, RichardJ Y. Impact behaviour of pre-compressed hollow and concrete filled mild and stainless steel columns [J].. Journal of Constructional Steel Research, 2014, 96: 54-68

[9] NakamuraS, MomiyamaY, HosakaT, HommaK. New Technologies of steel/concrete composite bridges [J].. Journal of Constructional Steel Research, 2002, 58(1): 99-130

[10] KangJ Y, ChoiE S, ChinW J. Flexural behavior of concrete-filled steel tube members and its application [J].. International Journal of Steel Structures, 2007, 7(4): 319-324

[11] MossahebiN, YakelA, AzizinaminiA. Experimental investigation of a bridge girder made of steel tube filled with concrete [J].. Journal of Constructional Steel Research, 2005, 61(3): 371-386

[12] YangY-f, MaG-liang. Experimental behaviour of recycled aggregate concrete filled stainless steel tube stub columns and beams [J].. Thin-Walled Structures, 2013, 66: 62-75

[13] LiuS, MichaelB F, ZhouW-xing. Alternative load paths in steel through-truss bridges: Case study [J].. Journal of Bridge Engineering, 2013, 18: 920-928

[14] ZhangL-y, LiZ-s, ChengM-fangConcrete filled steel tube space truss composite beam structure [M], 1999

[15] HanL-h, LiaoF-y, TaoZ, HongZhe. Performance of concrete filled steel tube reinforced concrete columns subjected to cyclic bending [J].. Journal of Constructional Steel Research, 2009, 65(8): 1607-1616

[16] FuZ-q, JiB-h, MaenoH, ElzienA, ChenJ-shu. Flexural behavior of lightweight aggregate concrete filled steel tube [J].. Advanced Steel Construction, 2014, 10(4): 385-403

[17] FuZ-q, JiB-h, YuZ-p, YangMing. Combined strength of lightweight aggregate concrete-filled steel tube [J].. Materials Research Innovations, 2015, 19(S5): 898-901