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| پرونده دریافت: ACI STRUCTURAL JOURNAL: Calibration of Design Code for Buildings (ACI 318): Part 2—Reliability Ana |
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 پرونده دریافت: ACI STRUCTURAL JOURNAL: Calibration of Design Code for Buildings (ACI 318): Part 2—Reliability Ana
ACI STRUCTURAL JOURNAL: Calibration of Design Code for Buildings (ACI 318): Part 2—Reliability Analysis and Resistance Factors
Calibration of Design Code for Buildings (ACI 318): Part 2—
Reliability Analysis and Resistance Factors
by Maria M. Szerszen and Andrzej S. Nowak
Calibration of the design code for concrete structures is presented
in two studies. The first one focused on the development of resistance
models. This paper deals with the reliability analysis and selection
of resistance factors. The structural types considered in this study
include beams, structural slabs, and columns. The analysis is
performed for reinforced concrete and prestressed concrete elements.
A wide range of materials is covered: ordinary concrete, highstrength
concrete, lightweight concrete, reinforcing bars No. 3
through 11, and two grades of prestressing strands. The reliability
analysis requires the knowledge of the statistical parameters for
load and resistance. Resistance models are described in the first
paper. In addition to the material parameters based on the new test
results, the parameters used in previous studies (1970s) were
considered. Load models are based on the data available in literature.
Reliability indexes are calculated using various load combinations,
the basic combination of dead load and live load, and other
combinations with snow, wind, and earthquake for the two
resistance models considered (older database and new material
database). The resulting values of the reliability index calculated
for the old data base and old load models, and potential consequences
of failure, served as a basis for the selection of the target reliability
index. For each type of structural element and load combination
case, several possible values of the resistance factor were considered
(rounded to the nearest 0.05). The recommended values provide a
close fit to the target reliability levels.
Keywords: analysis; load; resistance.
INTRODUCTION
This is the second of two papers presenting the calibration
of the Building Code Requirements for Structural Concrete
(ACI 318). The first study (Nowak and Szerszen 2003) focused
on the development of the statistical models for resistance
including strength of materials: concrete (ordinary concrete,
high-strength concrete, and lightweight concrete), reinforcing
steel, and prestressing steel. This paper deals with the reliability
analysis and selection of resistance (strength reduction) factors.
The 2002 edition of the Building Code Requirements for
Structural Concrete (ACI 318-02) specifies loads and load
combinations consistent with ASCE 7, Standard on Minimum
Design Loads for Buildings and Other Structures (1998).
The objective of this calibration is to calculate a new set of
resistance factors (strength-reduction factors) based on a
probabilistic analysis using the currently available statistical
data, so that the reliability of designed elements is consistent
with a predetermined target level.
The calibration procedure follows the basic steps as described
by Nowak and Collins (2000). Load and resistance parameters
are treated as random variables. Therefore, structural performance
is measured in terms of the reliability index (Nowak
and Collins 2000). The statistical parameters of load are
based on the available literature, and for resistance, two
databases are considered: one from the 1970s, and the otherfrom material tests performed in 2000 and 2001 (Nowak and
Szerszen 2003). The quality of workmanship can have a strong
influence on materials, and it is assumed to be of average level...
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اندازه فايل: 800.78 کیلو بایت
تاریخ ارسال: پنجشنبه، 23 آذر، 1385
دریافت فایل: 64
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توضیحات:
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