Advances in Structural Engineering Research

Single Abstract

335896 - Modeling nonlinear behavior of RC floor systems for seismic analysis

Friday, April 20
3:30 PM - 5:00 PM
Location: 202CD

When subjected to extreme seismic events, beams in reinforced concrete structures experience yielding and cracking. When this occurs, due to the development of flexural cracks and rebar yielding, a beam’s centerline has a tendency to grow by the sum of the crack widths at mid-height. This phenomenon is referred to as “beam growth”. This tendency to grow is restrained by tensile forces in the slab, which in turn cause compressive forces to develop along the axis of the beam. This compressive axial force can considerably affect beam flexural response and thus needs to be adequately accounted for when evaluating the seismic response of a reinforced concrete building. Therefore, it is important to model the tensile resisting force that develops in reinforced concrete slabs. Using a fiber-section nonlinear model of a 7-story reinforced concrete moment frame structure, building seismic response using an aggregated slab element is evaluated under seismic ground motions. The aggregated slab element consists of a truss element to model axial behavior in parallel with a fiber section element (with low axial stiffness) to model flexural response. The truss element will model the transfer of axial load from concrete to steel which occurs upon tensile rupture of the concrete. Nonlinear dynamic analyses are carried out under a suite of ground motions and building response using the aggregated slab element is compared with building response using other floor modelling techniques such as a rigid slab. The impact that different floor modeling techniques have on building response are discussed and conclusions are drawn.

Matthew D. Joyner

Research Assistant
Northeastern University

Matthew D. Joyner holds a Bachelor’s degree in Civil Engineering from Old Dominion University and a Master’s in Civil Engineering from The George Washington University. He is conducting research at Northeastern University while pursing his PhD in Civil Engineering there. His interests include performance based design, multi-hazard resilience, seismic analysis and design of structures.

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Mehrdad Sasani

Associate Professor
Northeastern University

Mehrdad Sasani’s research interests include progressive collapse of structures, earthquake engineering, and structural integrity and reliability. He has pioneered field experimentation and analytical modeling and evaluation of collapse resistance of actual structures. He is a recipient of the NSF Career Award. He has also conducted seismic hybrid simulations of structures subjected to severe seismic ground motions. He is conducting research on building resilience under multiple hazards. He is members of three standard committees of ASCE: Risk and Resilience Measurements Committee of Infrastructure Resilience Division; ASCE 41 Committee on Seismic Retrofit of Existing Buildings Standards; and Disproportionate Collapse Mitigation of Building Structures Standards. Sasani is the chair of American Concrete Institute committee 377: Performance-Based Structural Integrity & Resilience of Concrete Structures. He is also the chair of Massachusetts Engineers and Architects Emergency Response (MEAER) committee. Sasani is a recipient of 2016 BSCES/ASCE Clemens Herschel outstanding paper award.

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