International Concrete Abstracts Portal

Showing 1-5 of 20 Abstracts search results

Document: 

SP237

Date: 

October 11, 2006

Author(s):

Editors: Laura Lowes and Filip Filippou

Publication:

Symposium Papers

Volume:

237

Abstract:

SP-237CD This CD-ROM is a collection of 19 papers presented at a workshop sponsored by Joint ACI-ASCE Committee 447, Finite Element Analysis of Reinforced Concrete Structures, and JCI Committee 016SP, in Maui, Hawaii, USA, in November 2003. A broad range of topics was addressed, including the creation of new experimental data sets for use in developing, calibrating, and validating models; the development and validation of plain, reinforced, and fiber-reinforced concrete constitutive models; new approaches to simulating the response of reinforced concrete continua; new element formations to enable improved simulation of component response; and new computational techniques.

DOI:

10.14359/18184


Document: 

SP237-06

Date: 

August 1, 2006

Author(s):

T.T.C. Hsu, M.Y. Mansour, Y.L. Mo, and J. Zhong

Publication:

Symposium Papers

Volume:

237

Abstract:

A Cyclic Softened Membrane Model (CSMM) was developed to rationally predict the cyclic shear responses of reinforced concrete (RC) elements, including the pinching effect in the hysteretic loops, the shear stiffness, the shear ductility and the energy dissipation capacities1, 2. This CSMM model was verified by the tests of fifteen RC panels at the University of Houston. Test results confirmed that the orientation of the steel bars and the percentage of steel in a panel are the two most important variables that influence the cyclic response of RC panel elements.Using OpenSees as a framework, the concept of the CSMM was simplified from a 2-D model into a 1-D model and implemented into a finite fiber element program for the prediction of concrete frame structures subjected to cyclic or dynamic loading. The developed program is validated by the reversed cyclic load tests of a reinforced concrete column and by the shake table tests of a prestressed concrete frame. The CSMM has recently been implemented into an OpenSees-based finite element program for a 2-D RC element that will allow structural engineers to predict the monotonic, cyclic and dynamic responses of structures containing walls. This 2-D RC element is validated in this paper by the prediction of the monotonic responses of two RC panels subjected to shear stresses.

DOI:

10.14359/18247


Document: 

SP237-07

Date: 

August 1, 2006

Author(s):

F. Rafueneau, G. Casaux, and J. Mazars

Publication:

Symposium Papers

Volume:

237

Abstract:

The purpose of this paper is the development of simplified numerical tools dedicated to seismic analysis of reinforced concrete structures. Beam formulation and constitutive relationships are described to simulate the behavior of shear walls under complex loadings. The attention of this work focuses on the torsion effects and the way to account for cross section wraping for simplified analysis.

DOI:

10.14359/18248


Document: 

SP237-08

Date: 

August 1, 2006

Author(s):

F.J. Vecchio

Publication:

Symposium Papers

Volume:

237

Abstract:

Code procedures for the seismic design of reinforced concrete structures are increasingly incorporating performance-based criteria, with ��push-over’ analyses becoming an accepted means of demonstrating sufficient energy-absorbing capacity. Hence, in concrete frame structures containing shear-critical structural elements, the post-peak load-deformation response of these members becomes of practical importance. A series of shear-critical beams was tested recently, patterned after the classic set of beams tested by Bresler and Scordelis forty years ago. In the current tests, particular attention was paid to capturing the post-peak response. The details and results of these beams are presented, providing data useful in testing and calibrating analytical procedures. Nonlinear finite element analyses were undertaken to determine current ability to accurately model post-peak ductility in shear-critical members. Results indicate that current procedures are of marginally acceptable accuracy, and that further developmental work is warranted. A case study, involving a large concrete frame structure built in a high seismic region and containing shear-deficient members, is discussed. This case underscores the importance of accurately calculating the post-peak ductility of shear-critical beams.

DOI:

10.14359/18249


Document: 

SP237-05

Date: 

August 1, 2006

Author(s):

S.J. Foster, Y.L. Voo, and K.T. Chong

Publication:

Symposium Papers

Volume:

237

Abstract:

A finite element model is developed for the analysis of fiber reinforced concrete plane stress members failing by mode I fracture. The constitutive law is built on the variable engagement model where the behavior of a fiber composite is obtained by integration of its parts (fibers and concrete matrix) over the cracked surface. In developing the model in this way the formulation is made generally applicable to any type of steel fiber-cement based matrix and to fiber cocktails with any combination of fibers in the mix in any ratios. The model is demonstrated for a reactive powder concrete girder failing in shear using local and non-local modeling. The finite element formulation is shown to be capable of modeling the girder, with good accuracy observed for the global load versus displacement history and is shown to correctly capture the localized shear failure mechanism.

DOI:

10.14359/18246


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