Advances in Structural Engineering Research
Full Session with Abstracts
337103-5 - Evaluation of ASCE-41 Modeling Parameters and Acceptance Criteria through a RC Building Case Study
Friday, April 20
1:30 PM - 3:00 PM
How does this session impact and improve the Structural Engineering Profession?
The ability to simulate the nonlinear dynamic response of RC buildings up to significant levels of component damage is of fundamental importance to evaluate their expected performance for different levels of seismic hazard. In the United States there is an increasing reliance on the provisions in the ASCE-41 Standard for developing models to simulate the nonlinear response of structures during strong earthquakes.
Recent changes in ASCE-7 are beginning to lay the foundation for the use of the modeling provisions in ASCE-41 to perform performance-based design of new construction. Modeling parameters for reinforced concrete columns in the ASCE-41 Evaluation Standard have undergone significant changes since their inception in early 2000s. The original set of modeling parameters, adopted from FEMA 356, was updated in 2007 to incorporate findings from component tests on the drift ratio at axial failure of reinforced concrete columns. Consistent with the philosophy of FEMA 356, the set of modeling parameters introduced in 2007 was calibrated to have a low probability of exceedance. A new set of modeling parameters was recently proposed intended to reflect expected behavior (mean values).
While these are positive improvements that are likely to yield more accurate models, the calibration of the modeling parameters in ASCE-41 was based on data sets from component tests, and the effect of the change in modeling parameters on the response of building systems is unknown. Furthermore, while modeling parameters for columns have undergone two updates, modeling parameters for beams remain unchanged. This paper presents the results from incremental dynamic analyses performed with both sets of column modeling parameters on a non-ductile reinforced concrete building located in Van Nuys California that was instrumented during several earthquakes. Analyses were performed for the ground motion sets in FEMA P695 and ground motions from earthquakes recorded at the building site. Results from incremental dynamic analyses are used to evaluate modeling parameters and acceptance criteria in ASCE-41 as well as the calculated intensity measure at collapse.
Is the topic of regional, national, or international interest?
The ASCE-41 provisions are used worldwide in areas of moderate and high seismic risk.
Who is the target audience?
The target audience of the presentation is very broad and includes university faculty interested in nonlinear dynamic analysis and the computational challenges associated with collapse simulation of RC structures. The presentation is also of interest to practicing engineers tasked with the use of the ASCE-41 provisions to evaluate existing structures, or to implement performance-based design procedures for new construction.
How will the session help the audience in their job?
The implementation of the modeling provisions in ASCE-41 is very challenging to practicing engineers and a case study such as the one presented will be helpful because it provides an example and because the results are correlated with existing damage reports.