Calibration of CSCM model for numerical modeling of UHPCFTWST columns against monotonic lateral loading
- Publisher:
- Elsevier
- Publication Type:
- Journal Article
- Citation:
- Engineering Structures, 2021, 240, pp. 1-18
- Issue Date:
- 2021-08-01
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1-s2.0-S0141029621005460-main.pdf | 15.59 MB |
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The objective of this study is to calibrate continuous surface cap model (CSCM) for ultra-high-performance concrete (UHPC), and then to investigate the structural behavior of UHPC filled thin-walled steel tubular (UHPCFTWST) column against monotonic lateral loading via numerical simulation of nonlinear pushover analysis. The parameters of CSCM model for UHPC were derived via fitting experimental data of a series of tests on UHPC under uniaxial/triaxial states. Subsequently, a detailed 3D FE (finite element) model of UHPCFTWST column against monotonic lateral loading was developed and validated. After that, the effect of main design parameters, including steel ratio, steel grade, axial compression ratio, dosage of steel fiber, and bonding strength, on the structural behavior of UHPCFTWST column against monotonic lateral loading was investigated via a parametric study based on the FE model. Eventually, the axial pressure-moment (P-M) interaction diagram of a specified UHPCFTWST column was derived to illustrate the sectional response. Comparisons of the lateral behavior of UHPCFTWST column with that of normal strength concrete (NSC) filled steel tubular (NSCFST) column were also made for better illustrations. It indicates that the lateral load capacity and ductility were both improved with the increase of steel ratio, whereas the increase of steel grade improved the lateral load capacity but reduced the ductility owing to the increase of yield drift ratio. Moreover, the increase of axial compression ratio improved the lateral load capacity but significantly degraded the ductility. Although the increase of the dosage of steel fiber improved the lateral load capacity and ductility, but a suitable volume ratio should be specified in consideration of the cost. The comparisons with NSCFST column indicated the advantage and potential of UHPC application to concrete filled steel tubular (CFST) column with a thinner steel tube and a higher grade of steel. The P-M interaction diagram of UHPCFTWST column exceeds that of NSCFST column by a large extent, which indicates a greater safety redundancy.
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