Advanced analysis and design
We have developed a Practical Advanced Analysis Program (PAAP) [1, 2] for advanced analysis and design of steel structures. Initially, the tool comprised of three nonlinear “line” elements: refined plastic hinge beam element [3], truss element [4, 5], and catenary cable element [6]. By using “line” elements, it is very computational efficiency compared to commercial packages such as ABAQUS and ANSYS as evidenced in the cases study of cable-stayed bridges [7] and cable suspension bridges [8]. Therefore, it is suitable for daily design purposes.
The PAAP software has been extended with the spring connection element [9], fibre hinge displacement-based beam elements [10-12], and fibre force-based beam element [13]. In particular, the fibre force-based beam element can capture all nonlinear effects such as local buckling of steel plates, confining effect of concrete, etc. This element can be used to model different types of composite structures such as CFST columns, composite beams, and composite shear walls (see below figure). We also developed advanced analysis models for steel-concrete composite frames with semi-rigid connections using the OpenSees platform [14].
Projects for Prospective PhD Students
We are looking for PhD students for the following projects of this topic:
- Integrating PAAP with the heat transfer analysis in OpenSees and the CFD fire model in FDS
- Develop the graphical user interface for OpenSees
References
[1] Thai HT, Kim SE. Practical advanced analysis software for nonlinear inelastic dynamic analysis of steel structures. Journal of Constructional Steel Research 2011;67:453-461.
[2] Thai HT, Kim SE. Practical advanced analysis software for nonlinear inelastic analysis of space steel structures. Advances in Engineering Software 2009;40:786-797.
[3] Thai HT, Kim SE, Kim J. Improved refined plastic hinge analysis accounting for local buckling and lateral-torsional buckling. Steel and Composite Structures 2017;24:339-349.
[4] Thai HT, Kim SE. Nonlinear inelastic time-history analysis of truss structures. Journal of Constructional Steel Research 2011;67:1966-1972.
[5] Thai HT, Kim SE. Large deflection inelastic analysis of space trusses using generalized displacement control method. Journal of Constructional Steel Research 2009;65:1987-1994.
[6] Thai HT, Kim SE. Nonlinear static and dynamic analysis of cable structures. Finite Elements in Analysis and Design 2011;47:237-246.
[7] Thai HT, Kim SE. Second-order inelastic analysis of cable-stayed bridges. Finite Elements in Analysis and Design 2012;53:48-55.
[8] Thai HT, Choi DH. Advanced analysis of multi-span suspension bridges. Journal of Constructional Steel Research 2013;90:29-41.
[9] Thai HT, Kim SE. Second-order distributed plasticity analysis of steel frames with semi-rigid connections. Thin-Walled Structures 2015;94:120-128.
[10] Thai HT, Kim SE. Second-order inelastic dynamic analysis of steel frames using fiber hinge method. Journal of Constructional Steel Research 2011;67:1485-1494.
[11] Thai HT, Kim SE. Nonlinear inelastic analysis of space frames. Journal of Constructional Steel Research 2011;67:585-592.
[12] Thai HT, Kim SE. Nonlinear inelastic analysis of concrete-filled steel tubular frames. Journal of Constructional Steel Research 2011;67:1797-1805.
[13] Thai HT, Uy B, Khan M. A modified stress-strain model accounting for the local buckling of thin-walled stub columns under axial compression. Journal of Constructional Steel Research 2015;111:57-69.
[14] Tran H, Thai HT, Ngo T, Uy B, Li D, Mo J. Nonlinear inelastic simulation of high-rise buildings with innovative composite coupling shear walls and CFST columns. Structural Design of Tall and Special Buildings 2021;30:1-20.