Parametric Study of ACI Seismic Design Provisions Through Dynamic Analysis of a Reinforced Concrete Intermediate Moment Frame

Parametric Study of ACI Seismic Design Provisions Through Dynamic Analysis of a Reinforced Concrete Intermediate Moment Frame PDF

Author: Michael James Richard

Publisher:

Published: 2009

Total Pages: 324

ISBN-13:

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Abstract: Reinforced concrete moment-resisting frames are structural systems that work to resist earthquake ground motions through ductile behavior. Their performance is essential to prevent building collapse and loss of life during a seismic event. Seismic building code provisions outline requirements for three categories of reinforced concrete moment-resisting frames: ordinary moment frames, intermediate moment frames, and special moment frames. Extensive research has been conducted on the performance of special moment-resisting frames for areas of high seismic activity such as California. More research is needed on the performance of intermediate moment frames for areas of moderate seismicity because the current code provisions are based on past observation and experience. Adapting dynamic analysis software and applications developed by the Pacific Earthquake Engineering Research (PEER) Group, a representative concrete intermediate moment frame was designed per code provisions and analyzed for specified ground motions in order to calculate the probability of collapse. A parametric study is used to explore the impact of changes in design characteristics and building code requirements on the seismic response and probability of collapse, namely the effect of additional height and the addition of a strong column-weak beam ratio requirement. The results show that the IMF seismic design provisions in ACI 318-08 provide acceptable seismic performance based on current assessment methodology as gravity design appeared to govern the system. Additional height did not negatively impact seismic performance, while the addition of a strong-column weak-beam ratio did not significantly improve results. It is the goal of this project to add insight into the design provisions for intermediate moment frames and to contribute to the technical base for future criteria.

Column Capacity Evaluation for Low-rise Moment Frame Steel Buildings in Mississippi Subject to Wind and Seismic Hazards

Column Capacity Evaluation for Low-rise Moment Frame Steel Buildings in Mississippi Subject to Wind and Seismic Hazards PDF

Author: Yihong Shi

Publisher:

Published: 2011

Total Pages: 140

ISBN-13:

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For the design of steel frame structures, AISC outlines approaches of second-order analysis. In this study, two of these approaches are considered: Amplified First-Order Analysis Method and Direct Analysis Method. The methods were studied using SAP2000. Amplification of moments in a two-story plane frame subject to a wind load case is computed using both methods and shown to be of comparable magnitude for small deformations. ASCE/SEI 7 and IBC provisions were used to develop lateral design load conditions for the frames. In this study, a hypothetical building was assumed to be constructed in four different locations (Southaven, Batesville, Jackson and Gulfport) in Mississippi capturing a range of relative importance for these two hazards. For a three-story moment resisting frame building, second-order effects were developed for each column using the Amplified First Order Analysis Method. Interaction ratios were then used as the basis for establishing capacity of each column and thus critical members and dominant hazard at a particular location. As expected, Southaven and Batesville are shown to be dominated by the earthquake hazard and Gulfport by the wind hazard. Jackson is roughly equally influenced by both hazards. Jackson may thus be considered a boundary for dividing the state into seismic dominated versus wind dominated zones. This evaluation may give insight to building designers in preliminary design.

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