United States Department of Transportation
i
Nonlinear Time History Analysis of Ordinary Standard Bridges
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2017-05-16
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[PDF-29.45 MB]
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Abstract:Reliable seismic response models are necessary to support the assessment and design of California highway bridges. To this end, similar results for nonlinear static and dynamic time history response should be obtained between disparate software packages. This requires transparency of the element and constitutive model formulations implemented in the software. Models of four ordinary standard bridges (OSBs) are created using the CSiBridge and OpenSees software packages, both widely used for bridge engineering applications. Similar distributions of mass and stiffness are achieved from each software package, as evidenced by agreement in modal analyses for models with simple roller abutments as well as models with nonlinear abutments. A series of benchmark problems show that the software packages are able to produce similar results for lumped and distributed plasticity frame elements. Further calibration and matching of constitutive models show that similar nonlinear static responses are attained for each OSB; however, the cyclic behavior of the constitutive models differ significantly, leading to discrepancies in dynamic response. Sensitivity analysis based on the direct differentiation method available in OpenSees shows the effect of modeling parameters on the response of each OSB. The most significant parameters were found to be the stiffness and strength of the abutment models.
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