Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Compressive performance of ECC-concrete encased high strength steel composite columns
Highlights Compression tests on high strength ECC-CES composite columns are performed. Effects of material strengths ECC cover thickness and column shape are investigated. ECC confinement improved the failure behaviour, ductility and toughness of ECC-CES columns. A 3D nonlinear numerical model is developed to predict the compressive response of ECC-CES columns. An empirical model to calculate the ultimate strength of ECC-CES columns is proposed.
Abstract The use of high strength steel (HSS) in the construction of concrete encased steel (CES) composite columns is often limited by the strain incompatibility issue between HSS and concrete at peak-load. This study proposes an alternative approach to confine the high strength concrete with Engineered Cementitious Composite (ECC) to improve its compatibility with high strength steel. The main purpose of this study is to experimentally evaluate the axial compressive performance of the proposed composite column cross-section configuration. Behaviours of fifteen short columns including twelve ECC-CES columns are investigated in terms of failure modes, load-deformation curves, ductility and energy absorption capacity. The test parameters included ECC and concrete strengths, ECC cover thickness, steel section shape and column section’s aspect ratio. It was found that ECC generally improved the failure behaviour of high strength steel CES columns and increased the deformation and energy absorption capacity. On average ECC-CES columns showed around 12% and 8% higher ductility and toughness than control concrete column, respectively. A detailed 3D nonlinear finite element model was developed and validated against experimental results. Applicability of current design codes to predict the ultimate strength of ECC-CES columns was also evaluated. Finally, a method to calculate the ECC-CES column’s capacity considering effective material stresses at peak-load was proposed.
Compressive performance of ECC-concrete encased high strength steel composite columns
Highlights Compression tests on high strength ECC-CES composite columns are performed. Effects of material strengths ECC cover thickness and column shape are investigated. ECC confinement improved the failure behaviour, ductility and toughness of ECC-CES columns. A 3D nonlinear numerical model is developed to predict the compressive response of ECC-CES columns. An empirical model to calculate the ultimate strength of ECC-CES columns is proposed.
Abstract The use of high strength steel (HSS) in the construction of concrete encased steel (CES) composite columns is often limited by the strain incompatibility issue between HSS and concrete at peak-load. This study proposes an alternative approach to confine the high strength concrete with Engineered Cementitious Composite (ECC) to improve its compatibility with high strength steel. The main purpose of this study is to experimentally evaluate the axial compressive performance of the proposed composite column cross-section configuration. Behaviours of fifteen short columns including twelve ECC-CES columns are investigated in terms of failure modes, load-deformation curves, ductility and energy absorption capacity. The test parameters included ECC and concrete strengths, ECC cover thickness, steel section shape and column section’s aspect ratio. It was found that ECC generally improved the failure behaviour of high strength steel CES columns and increased the deformation and energy absorption capacity. On average ECC-CES columns showed around 12% and 8% higher ductility and toughness than control concrete column, respectively. A detailed 3D nonlinear finite element model was developed and validated against experimental results. Applicability of current design codes to predict the ultimate strength of ECC-CES columns was also evaluated. Finally, a method to calculate the ECC-CES column’s capacity considering effective material stresses at peak-load was proposed.
Compressive performance of ECC-concrete encased high strength steel composite columns
Lee, C.K. (Autor:in) / Khan, M.K.I. (Autor:in) / Zhang, Y.X. (Autor:in) / Rana, Mohammad M. (Autor:in)
Engineering Structures ; 213
22.03.2020
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
Buckling behaviour of high strength concrete encased steel composite columns
| British Library Online Contents | 2019