Open Access
ARTICLE
S.R. Soni2, E.D. Swenson3, R.T. Underwood4
Structural Longevity, Vol.2, No.2, pp. 63-79, 2009, DOI:10.3970/sl.2009.002.063
Abstract Detecting through-thickness fatigue cracks in a geometrically constrained structure is a challenging structural health monitoring (SHM) problem due
to potentially degraded sensor performance. Fatigue cracks are typically found
in aircraft structures during visual inspections and non-destructive testing (NDT);
however, there exists a real need to detect damage between NDT intervals. Over
the last decade, a significant amount of research effort has been focused on developing “hot spot” approaches to monitor areas of structures known to have damage
using Lamb waves generated from surface-mounted lead zirconate titanate (PZT)
transducers. This research is focused on evaluating an SHM approach for detecting
fatigue… More >
Open Access
ARTICLE
Yasser Sharifi1, Jeom Kee Paik1,2
Structural Longevity, Vol.2, No.2, pp. 81-101, 2009, DOI:10.3970/sl.2009.002.081
Abstract This study develops an assessment procedure for the ultimate strength
reliability of steel box girder bridges that takes into account the plate member
degradation that results from uniform corrosion in different environmental conditions. This paper is a sequel to the authors’ previous paper (Sharifi and Paik 2010),
which deals with the effects of pit and general corrosion on the load-carrying capacity and reliability of these bridges. In contrast to that paper, the effects of different
environmental conditions on such capacity and reliability are considered herein.
Probabilistic corrosion rate parameters based on the available data are provided,
and an analytical formula… More >
Open Access
ARTICLE
Ming-Te Liang1,2, Jiang-Jhy Chang3, Han-Tung Chang3, Chi-Jang Yeh4
Structural Longevity, Vol.2, No.2, pp. 103-128, 2009, DOI:10.3970/sl.2009.002.103
Abstract Engineering experience has clearly shown that existing reinforced
concrete (RC) bridges are reliable to damage from environmental attack such as
freeze-thaw, alkali-silica reaction, and corrosion. To establish feasible and rational
method, reliable prediction of the service life of deteriorating RC bridge is needed.
To obtain an exact insight into this problem, time-dependent reliability methods
have to be used. In this paper, the reliability of RC girder bridges under corrosion
condition is studied using a time-dependent reliability analysis in which both load
and resistance are time-dependent. The corrosion process has three stages, the
initiation (diffusion or carbonation) time (ti = tc),… More >
Open Access
ARTICLE
JF Liu1, C Chen2, YB Shao3, WF Yuan4
Structural Longevity, Vol.2, No.2, pp. 129-137, 2009, DOI:10.3970/sl.2009.002.129
Abstract Yield line theory is commonly used for predicting the load carrying
capacity of a tubular joint. Theoretical method and numerical investigation have
both been carried out to determine the profile of yield lines on the chord surface
for a circular tubular T-joint under axial compression. Two yield lines in a form of
closed space curve are assumed to initiate when the axial compressive load reaches
a critical value. The first yield line is located along the weld toe, and the second
yield line is determined by minimum energy principle. Through finite element
simulation and verification, the theoretical method is evaluated… More >
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