Catenary action of restrained steel beam against progressive collapse of steel frameworks |
| |
Authors: | Guo-qiang Li Kai-qiang Wang Yu-shu Liu and Su-wen Chen |
| |
Affiliation: | [1]Department of Building Engineering, School of Civil Engineering, Tongji University, Shanghai 200092, China [2]State Key Laboratory for Disaster Reduction in Civil Engineering, Tongji University, Shanghai 200092, China [3]School of Civil Engineering, Wuhan University, Wuhan 430072, China [4]China Construction 3rd Engineering Bureau Co. Ltd., Wuhan 430064, China |
| |
Abstract: | The changing law of internal forces during the whole deformation development process was analyzed. The process was divided
into five stages based on the internal force state of the beam and the assumptions of internal force relationship of five
stages were proposed. Then, the formulas for determining the midspan deflection of the steel beam under distributed load,
which was restrained both in rotational and axial directions, were obtained using restraint coefficient method and rigid-plastic
mechanism, thereby the deformation development process was expressed accurately in a quantified way. Priority was given to
the analysis of the process from bending to tension-bending, then the final state totally depends on tension to resist the
external loads, that is the problem of catenary action of the restrained beam under distributed load. Additionally, finite
element analysis was carried out with software ABAQUS6.7 on a restrained steel beam under distributed load with different
axial and rotational restraint coefficients. The accuracy of the formulas presented was verified by the results of the behavior
of the restrained beams. Finally, error analysis was conducted and some formulas were corrected according to the reasons of
errors. The calculated results of corrected formulas match the FEM analysis results better, thus the accuracy of these formulas
is improved. |
| |
Keywords: | restrained steel beam catenary action rigid-plastic mechanism numerical analysis formula correction |
本文献已被 维普 SpringerLink 等数据库收录! |
|