Ultimate Analysis of Steel Structures Based on Fiber Hinge Model and Time-Varying Structure Theory

다국어 초록 (Multilingual Abstract)

Oversize deformations and local damages may occur in steel structures due to inappropriate design, inadequacy of construction, improper uses and some other factors. Such damages could produce serious safety problems and shorten the service life of the structures. We proposed in this paper an effective and accurate method for analyzing the ultimate bearing capacity of steel framework based on the fiber hinge model and time-varying structure theory. A detailed study was conducted to investigate a cantilever column with I shaped cross section. The effects of cross section division and fiber hinge unit length on computation accuracy were investigated using SAP2000 finite element software. The proposed method was then applied to a real-life engineering problem, in which the steel structure of a mechanical building was gradually damaged under the action of uneven foundation settlement. The detailed information was obtained for the whole structural damage process as well as for the structural improvements after reinforcement. The results presented in this paper provided valuable information for strengthening of the damaged structures that are usually difficult to obtain in field detection, as well as the critical information for evaluating the structure conditions. In addition, the results in this paper could also provide useful information for safety assessment of new constructions.

참고문헌 (Reference)

1 Jiang, X. M., "Spreadof-plasticity analysis of three-dimensional steel frames" 58 : 193-212, 2002

2 Thai, H. T., "Second-order inelastic dynamic analysis of steel frames using fiber hinge method" 67 : 1485-1494, 2011

3 CSI, "SAP2000-SAP2000 Integrated finite element analysis and design of structures" Computers and Structures, Inc 2006

4 Wang, L. K., "Research of plastic-zone models for advanced analysis of space steel frames" 91 : 1-4, 2010

5 Cuong, N. H., "Practical nonlinear analysis of steel-concrete composite frames using fiberhinge method" 74 : 90-97, 2012

6 Cuong, N. H., "Practical advanced analysis of space steel frames using fiber hinge method" 47 : 421-430, 2009

7 Abdelsamie, E., "Plastic hinge length considering shear reversal in reinforced concrete elements" 16 : 188-210, 2012

8 Wang, G. Y., "On mechanics of time-varying structures" 33 : 105-107, 2000

9 Cuong, N. H., "Nonlinear analysis of space steel frames using fiber plastic hinge concept" 29 : 649-657, 2007

10 Zubydan, A. H., "Inelastic large deflection analysis of space steel frames including H-shaped cross sectional members" 48 : 155-165, 2013

11 Kim, S. E., "Improved refined plastichinge analysis accounting for local buckling" 23 : 1031-1042, 2001

12 Nurettin, A., "Elastic-plastic stress analysis and expansion of plastic zone in clamped and simply supported thermoplastic-matrix laminated plates with square hole" 64 : 1147-1166, 2004

13 Kim, S. E., "Direct design of three-dimensional frames using practical advanced analysis" 23 : 1491-1502, 2001

14 Cao, Z. Y., "Construction mechanics and timevarying mechanics in civil engineering" 34 : 41-46, 2001

15 Zhang, H. D., "Application to ANSYS Unit Technical Software to structural design and construction" 30 : 824-825, 2008