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Design seismic performance of R/C framestructures taking into account foundation flexibility
This paper concerns the problem of design seismic performance of R/C frames with flexible foundations. Analysis is carried out by capacity spectrum method assuming two parametric nonlinear soil model and inelastic behaviour of structural R/C members. The overall structural model includes R/C part and flexible foundations. An additional rotational degree of freedom is implemented to capture foundation rocking motion. To do this “soil type” plastic hinge is proposed. Soil deformations are calculated through site-specific data such as unit foundation modulus and soil capacity. Capacity spectrum is then calculated considering coupled structure-foundation system. Two categories of results for target displacements are compared and analyzed—first for fixed base structure and second for structure with flexible foundation. The case of fixed base structure is used as reference case. Numerical results are graphically illustrated. An analytical estimate for target displacement—behaviour factor relationship is proposed. It allows for displacement-based control on seismic demands. Basing on the numerical results it is concluded that in general foundation flexibility influences the overall structural response. Due to soil deformations target displacements are larger than corresponding target displacements of the fixed-base structure. Foundation flexibility reduces the global ductility of structure. Displacement demands can effectively be controlled by suitable choice of behaviour factor. This procedure creates opportunity for displacement-based seismic design.
Design seismic performance of R/C framestructures taking into account foundation flexibility
This paper concerns the problem of design seismic performance of R/C frames with flexible foundations. Analysis is carried out by capacity spectrum method assuming two parametric nonlinear soil model and inelastic behaviour of structural R/C members. The overall structural model includes R/C part and flexible foundations. An additional rotational degree of freedom is implemented to capture foundation rocking motion. To do this “soil type” plastic hinge is proposed. Soil deformations are calculated through site-specific data such as unit foundation modulus and soil capacity. Capacity spectrum is then calculated considering coupled structure-foundation system. Two categories of results for target displacements are compared and analyzed—first for fixed base structure and second for structure with flexible foundation. The case of fixed base structure is used as reference case. Numerical results are graphically illustrated. An analytical estimate for target displacement—behaviour factor relationship is proposed. It allows for displacement-based control on seismic demands. Basing on the numerical results it is concluded that in general foundation flexibility influences the overall structural response. Due to soil deformations target displacements are larger than corresponding target displacements of the fixed-base structure. Foundation flexibility reduces the global ductility of structure. Displacement demands can effectively be controlled by suitable choice of behaviour factor. This procedure creates opportunity for displacement-based seismic design.
Design seismic performance of R/C framestructures taking into account foundation flexibility
Schanz, Tom (Autor:in) / Bonev, Zdravko (Autor:in) / Wuttke, Frank (Autor:in) / Iankov, Roumen (Autor:in) / Georgiev, Valeri (Autor:in)
01.01.2009
17 pages
Aufsatz/Kapitel (Buch)
Elektronische Ressource
Englisch
Design Seismic Performance of R/C Frame Structures Taking into Account Foundation Flexibility
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