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Home > Publications > International Concrete Abstracts Portal
Showing 1-5 of 17 Abstracts search results
Document:
SP133-16
Date:
September 1, 1992
Author(s):
Howard H. M. Hwang and Hui-Mi Hsu
Publication:
Symposium Papers
Volume:
133
Abstract:
This paper presents the evaluation of seismic performance of a special moment-resisting (SMR) frame building and an intermediate moment-resisting (IMR) frame building designed in accordance with the NEHRP provisions and ACI Code 318-83. The annual limit-state probabilities for both SMR and IMR frames are determined by integrating the seismic hazard curve and structural fragility curve. From the comparison between the calculated annual limit-state probability and the specified acceptable risk levels, the seismic performance of a structure can be evaluated. In the NEHRP provision, if reinforced concrete frames are used to resist earthquake forces, the SMR frame is required for buildings belonging to higher seismic performance categories such as Categories D and E. Even though the SMR frame has a higher ductility than the IMR frame, the SMR frame is only designed for 50 percent of the strength required for the IMR frame. As demonstrated in this study, the IMR frame may perform better than the SMR frame in the event of an earthquake. Thus, the concept employed in the NEHRP provisions to protect high-risk and essential buildings needs careful reexamination.
DOI:
10.14359/3062
SP133-04
R.S. Fling
This paper reviews the development of deflection calculation procedures and comments on the risk of computational errors. It then discusses practical considerations affecting deflection and their limitations. It assesses the effect of nine parameters on the variability of deflection by reference to two example beams. Finally, the paper recommends further laboratory and analytical research and makes suggestions on how design engineers may improve the accuracy of their deflection computations.
10.14359/10031
SP133-02
Andrew Scanlon and Ross B. Corotis
The American Concrete Institute, Standard 318, Building Code Requirements for Reinforced Concrete have permitted the design of reinforced concrete structures in accordance with limit state principles using load and resistance factors since 1963. A probabilistic assessment of these factors and implied safety levels is made, along with consideration of alternate factor values and formats. A discussion of issues related to construction safety and safety of existing structures is included.
10.14359/3138
SP133-03
M. Z. Cohn an Z. Lounis
An approach that integrates serviceability control with the ultimate limit state (ULS) design is presented. Each serviceability limit (SLS) is related to an amount of moment redistribution that corresponds to the permissible values of the crack widths, deflections, and stresses under service conditions. A design that simultaneously satisfies the specified ULS and SLS criteria may be obtained if the assigned moment redistribution percentages y do not exceed the recommended redistribution limits for serviceability control. The proposed approach integrates all relevant design criteria via the moment redistribution percentage y, and may be used within the framework of ACI 318-89 or other standard codes. The approach allows a direct extension to existing nonlinear, multicriteria, and optimal design methods.
10.14359/3143
SP133-05
B. Vijaya Rangan
The paper presents a summary of treatment of serviceability design in the current Australian Code, AS 3600-1988. The backgrounds to the code rules with regard to control of deflection and crack widths are presented. The provisions for durability design of concrete structures are also discussed.
10.14359/3148
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The International Concrete Abstracts Portal is an ACI led collaboration with leading technical organizations from within the international concrete industry and offers the most comprehensive collection of published concrete abstracts.
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