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A platform for research: civil engineering, architecture and urbanism
Seismic Performance of Column-Foundation-Joints with Post-installed Rebar Connections: Pre-test Simulations
Abstract Seismic strengthening and retrofitting of reinforced concrete structures frequently requires increased sizes (and reinforcement) of the existing columns or providing additional vertical load carrying members (columns). The efficiency of the added columns in carrying the seismic forces depends largely on the effectiveness of the connection between the new columns and the existing structure (foundations, beams and slabs). To form a connection between the existing structural member and the column, post-installed rebar are required. The behavior of these connections can be visualized either from the point of view of the reinforced concrete theory, which requires long bonded lengths (due to equivalence with cast-in reinforcement) or from the point of view of bonded anchor design that requires relatively short bond lengths. Guidelines for application of post-installed reinforcing bars under seismic loads are available in US. In Europe there are no such provisions. In this work, numerical simulations are performed to investigate the behavior of column-foundation connections using post-installed rebar. The dependence of the connection behavior on failure modes is demonstrated using 3D finite element (FE) analyses. The method used for FE modelling has been validated with experiments available in literature. It is highlighted that an approach which is a function of the governing failure modes can form the possible framework to give due consideration to the higher bond strength of post installed rebar connection for column-foundation-connection applications. For further development of such an approach valid over a wide range of parameters, a proposal for performing certain benchmark experiments is also presented. The expected results from the proposed experiments are included.
Seismic Performance of Column-Foundation-Joints with Post-installed Rebar Connections: Pre-test Simulations
Abstract Seismic strengthening and retrofitting of reinforced concrete structures frequently requires increased sizes (and reinforcement) of the existing columns or providing additional vertical load carrying members (columns). The efficiency of the added columns in carrying the seismic forces depends largely on the effectiveness of the connection between the new columns and the existing structure (foundations, beams and slabs). To form a connection between the existing structural member and the column, post-installed rebar are required. The behavior of these connections can be visualized either from the point of view of the reinforced concrete theory, which requires long bonded lengths (due to equivalence with cast-in reinforcement) or from the point of view of bonded anchor design that requires relatively short bond lengths. Guidelines for application of post-installed reinforcing bars under seismic loads are available in US. In Europe there are no such provisions. In this work, numerical simulations are performed to investigate the behavior of column-foundation connections using post-installed rebar. The dependence of the connection behavior on failure modes is demonstrated using 3D finite element (FE) analyses. The method used for FE modelling has been validated with experiments available in literature. It is highlighted that an approach which is a function of the governing failure modes can form the possible framework to give due consideration to the higher bond strength of post installed rebar connection for column-foundation-connection applications. For further development of such an approach valid over a wide range of parameters, a proposal for performing certain benchmark experiments is also presented. The expected results from the proposed experiments are included.
Seismic Performance of Column-Foundation-Joints with Post-installed Rebar Connections: Pre-test Simulations
Mahadik, Vinay (author) / Sharma, Akanshu (author) / Hofmann, Jan (author)
2017-08-06
8 pages
Article/Chapter (Book)
Electronic Resource
English
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