References of "Degee, H"
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See detailEffective bending stiffness of steel-concrete composite columns with multiple encased steel profiles
Chrzanowski, M.; Odenbreit, Christoph UL; Obiala, R. et al

in Journal of constructional steel research (2021), 181

For the structural analysis of steel-concrete composite columns, Eurocode 4 allows only cross-sections with one implemented steel profile and double symmetry. However, there are worldwide more and more ... [more ▼]

For the structural analysis of steel-concrete composite columns, Eurocode 4 allows only cross-sections with one implemented steel profile and double symmetry. However, there are worldwide more and more examples of composite columns with more than one embedded steel profiles, like for example in the International Financial Center of Hong Kong and the Ping Anh Finance Center in Shenzhen. The common practice of analysis of such columns is to use the simple Euler-Bernoulli beam theory to describe the global behaviour. But recently, performed tests reveal that the resulting deformations exceed largely the deformations predicted by the aforementioned analytical model. The presented contribution shows a modified approach to analyse the stiffness of composite columns with multiple encased steel profiles. Based on the performed laboratory tests and numerical simulations with the finite element code Abaqus®, a new method to determine the effective stiffness is proposed. It combines a modified Timoshenko beam theory with embedded Vierendeel truss model – the VTBM model. This modified method leads to a reduced value of the effective stiffness, more realistic deformations at Ultimate Limit State and thus to a more realistic assessment of the Euler's critical buckling load. •Columns used in high-rise buildings are often out of the scope of design codes.•Separated steel cores in a column's cross-section leads to an innovative hypothesis.•Transition from the Euler-Bernoulli beam theory towards Vierendeel truss behaviour.•Vierendeel-like beam behaviour confirmed in tests and finite element simulations.•Proposed novel analytical model allows for a more accurate stability analysis. [less ▲]

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See detailHysteretic behaviour of steel fibre RC coupled shear walls under cyclic loads: Experimental study and modelling
Zhao, J.; Cai, Gaochuang UL; Si Larbi, Amir et al

in Engineering Structures (2018)

This paper presents the hysteretic behaviour of three 1/3-scale three-storey steel fibre reinforced concrete (SFRC) coupled shear walls (CSWs) under cyclic loads. The deformation, ductility, energy ... [more ▼]

This paper presents the hysteretic behaviour of three 1/3-scale three-storey steel fibre reinforced concrete (SFRC) coupled shear walls (CSWs) under cyclic loads. The deformation, ductility, energy dissipation, stiffness and crack propagation of the specimens are also discussed and analysed. The results show steel fibre improves the ductility and energy dissipation capacity, and restrains the crack propagation of the CSWs, and delays the degradation of their lateral stiffness and force. Based on the experiments, a simple trilinear model is developed to simulate the skeleton curve of lateral force–displacement of the SFRC CSWs. Through analysing several typical cycles of the hysteretic of these CSWs, the feature points of the proposed hysteretic model are defined which subsequently is used to evaluate the complete hysteretic behaviour of the CSWs. Using existing experimental data and this study, several representative experimental hysteretic cycles are compared with the proposed model. The result indicates a good agreement is reached between the model and experimental results. [less ▲]

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See detailSimplified density indexes of walls and tie-columns for confined masonry buildings in seismic zones
Cai, Gaochuang UL; Su, Q.W; Tsavdaridis, K.D. et al

in Journal of Earthquake Engineering (2017)

This paper discusses and quantifies the minimum requirements of walls and tie-columns in confined masonry (CM) buildings located in earthquake-prone regions. A research database including 238 damaged CM ... [more ▼]

This paper discusses and quantifies the minimum requirements of walls and tie-columns in confined masonry (CM) buildings located in earthquake-prone regions. A research database including 238 damaged CM buildings obtained from the 2008 Wenchuan earthquake survey is established and comprehensively examined. The requirements of masonry walls in CM buildings are discussed, and a simplified tie-column density index is proposed for evaluating the potential damage of the structures. Besides, the minimum requirements of reinforced concrete tie-columns and their maximum allowable spacing in CM buildings at different seismic intensity zones are discussed. [less ▲]

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