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RESPONSE ESTIMATION OF REINFORCED CONCRETE COLUMNS SUBJECTED TO LATERAL LOADS

Lodhi, Muhammad S.
http://rave.ohiolink.edu/etdc/view?acc_num=osu1269631164

Abstract Details

2010, Master of Science, Ohio State University, Civil Engineering.
There is significantly large number of reinforced concrete buildings in the US and many parts of the world that are not designed according to prevailing seismic code provisions. These buildings are often characterized by low lateral displacement capacity and rapid degradation of shear strength and hence are vulnerable to severe damage or even collapse during strong ground motions. Typically, columns in such buildings have insufficient and widely spaced transverse reinforcement and lack essential seismic reinforcement details. These columns exhibit lack of strength and ductility in reverse cyclic loading and are vulnerable to brittle shear failure and loss of axial load carrying capacity during strong ground shaking. The need to assess their vulnerability to earthquake damage and hence suggesting the desired level of retrofit requires evaluation of the expected behavior in terms of strength and deformation capacity. This can be achieved by estimating the load-deformation response considering all potential failure mechanisms associated with axial, flexure and shear behavior. This study evaluates two different macro models to investigate their capabilities to determine the lateral response. Based on the comparison of the predicted responses with experimental test data, an analytical procedure is proposed. In the proposed procedure, flexural and shear deformations are determined while considering interaction between these mechanisms. Flexural deformations are calculated by incorporating effect of shear deformation on flexural performance through compression softening factor. Likewise, shear deformations are calculated by employing axial strain and shear stresses from axial-flexure model to consider the effect of flexural deformations on shear behavior. The interaction between axial-flexure and axial-shear mechanisms allows for accurate response estimation while decoupled flexural analysis minimizes iterations within the analysis and make the process relatively simple and easy. In addition, buckling of compression bars is also incorporated by considering separate stress-strain relationships for reinforcing steel in tension and compression. The displacement due to reinforcement slip are calculated separately and added to flexural and shear displacements. Total lateral response is obtained by combining deformation components due to flexure, shear and reinforcement slip according to a set of rules based on comparison of the column yield, flexural and shear strength. The comparison of the predicted responses with experimental test data showed that proposed procedure performs well in estimating response of reinforced concrete columns to lateral loads.
Halil Sezen, Dr. (Advisor)
Shive .K Chaturvedi, Dr. (Committee Member)
Ethan Kubatko, Dr. (Committee Member)
188 p.
Civil Engineering
Reinforced concrete column; Shear failure; Flexural deformations; Shear deformations; Bar slip deformations; Response estimation; Load-deformation relationships

Recommended Citations

Citations

  • Lodhi, M. S. (2010). RESPONSE ESTIMATION OF REINFORCED CONCRETE COLUMNS SUBJECTED TO LATERAL LOADS [Master's thesis, Ohio State University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=osu1269631164

    APA Style (7th edition)

  • Lodhi, Muhammad. RESPONSE ESTIMATION OF REINFORCED CONCRETE COLUMNS SUBJECTED TO LATERAL LOADS. 2010. Ohio State University, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=osu1269631164.

    MLA Style (8th edition)

  • Lodhi, Muhammad. "RESPONSE ESTIMATION OF REINFORCED CONCRETE COLUMNS SUBJECTED TO LATERAL LOADS." Master's thesis, Ohio State University, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=osu1269631164

    Chicago Manual of Style (17th edition)

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This open access ETD is published by The Ohio State University and OhioLINK.