Flexural-torsional behavior of channel steel beams considering large deformation and additional torque: theory and experiment
Yipei Zeng,Fuli Liu,Xianhui Yi,Langhong Tang,Songqiang Li,Xiao Li,Yong Cai
Abstract
This study investigates the flexural-torsional behavior of channel steel beams used in prefabricated hanger systems under large deformation. A geometrically nonlinear analytical model is developed based on Vlasov thin-walled beam theory and Green-Lagrange strain, incorporating centroid migration and the resulting additional torsional moment. The governing equations are derived using the variational principle and solved by the Galerkin method. Experimental tests on two representative channel sections subjected to mid-span concentrated loading are conducted for validation. Good agreement between theoretical predictions and experimental results confirms the accuracy of the proposed model. Parametric analysis shows that geometric nonlinearity and flexural-torsional coupling become increasingly significant with increasing span. The nonlinear deformation amplification factor increases from 1.02 to 1.38, while the flexural-torsional contribution rises from 2.8% to 23.7% as the span increases from 500 mm to 3000 mm. The proposed model provides a practical basis for the design of long-span prefabricated hanger systems.
Yipei Zeng, Fuli Liu, Xianhui Yi, Langhong Tang, Songqiang Li, Xiao Li — China Construction Fifth Bureau Installation Engineering Co., Ltd, Shenzhen 410004, China
Yong Cai — School of Civil Engineering, Central South University, Changsha 410075, China
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