Presentation Title

Modeling Earthquake Forces in Concrete Structures

Start Date

November 2016

End Date

November 2016

Location

Watkins 1111

Type of Presentation

Oral Talk

Abstract

Finite Element Model for Reinforced Concrete Structural Walls

Reinforced concrete (RC) structural walls are the most commonly used structural elements in buildings to resist lateral forces created by earthquakes. Therefore, analytical models capable of capturing important nonlinear response characteristics of RC walls are essential for engineering seismic-resistant design and evaluation. Analytical models for nonlinear analysis of RC walls currently available in the literature are characterized with four significant shortcomings: 1) models are capable of simulating behavior of planar (two-dimensional) walls only, 2) models do not capture interaction between shear and flexural responses because of which they tend to overestimate wall strength and deformation capacity, 3) models are not validated against extensive experimental data, and 4) models are not available to broad engineering and research community.

A research project has been initiated to develop and validate extensively analytical modeling approach for RC walls that will address mentioned shortcomings. The proposed modeling approach incorporates a RC panel behavior described with the fixed-strut angle approach into a four-node finite element model formulation characterized with 6 degrees of freedom per node, which allows simulation of three-dimensional behavior of RC walls. Model validation studies completed to date include comparison of analytical and experimental results for three RC wall specimens spanning a range of characteristics including geometry of the wall cross-section, wall height-to-length ratio, boundary and web reinforcing ratios, and axial load. In addition, the model is implemented into OpenSees, an open-source computational platform widely used in earthquake engineering community. Based on results of the analytical studies presented, it has been observed that developed analytical model is capable of capturing with reasonable accuracy both global (force-deformation) and local (strain) wall responses levels. Future work includes application of the modeling approach to estimation of seismic impact on tall buildings in urban areas, a research project funded by the National Science Foundation.

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Nov 12th, 11:15 AM Nov 12th, 11:30 AM

Modeling Earthquake Forces in Concrete Structures

Watkins 1111

Finite Element Model for Reinforced Concrete Structural Walls

Reinforced concrete (RC) structural walls are the most commonly used structural elements in buildings to resist lateral forces created by earthquakes. Therefore, analytical models capable of capturing important nonlinear response characteristics of RC walls are essential for engineering seismic-resistant design and evaluation. Analytical models for nonlinear analysis of RC walls currently available in the literature are characterized with four significant shortcomings: 1) models are capable of simulating behavior of planar (two-dimensional) walls only, 2) models do not capture interaction between shear and flexural responses because of which they tend to overestimate wall strength and deformation capacity, 3) models are not validated against extensive experimental data, and 4) models are not available to broad engineering and research community.

A research project has been initiated to develop and validate extensively analytical modeling approach for RC walls that will address mentioned shortcomings. The proposed modeling approach incorporates a RC panel behavior described with the fixed-strut angle approach into a four-node finite element model formulation characterized with 6 degrees of freedom per node, which allows simulation of three-dimensional behavior of RC walls. Model validation studies completed to date include comparison of analytical and experimental results for three RC wall specimens spanning a range of characteristics including geometry of the wall cross-section, wall height-to-length ratio, boundary and web reinforcing ratios, and axial load. In addition, the model is implemented into OpenSees, an open-source computational platform widely used in earthquake engineering community. Based on results of the analytical studies presented, it has been observed that developed analytical model is capable of capturing with reasonable accuracy both global (force-deformation) and local (strain) wall responses levels. Future work includes application of the modeling approach to estimation of seismic impact on tall buildings in urban areas, a research project funded by the National Science Foundation.