Routine Highway Bridge Inspection Condition Documentation Accuracy and Reliability

Routine inspection is the most common form of highway bridge inspection to satisfy the requirements of the National Bridge Inspection Standards. The accuracy and reliability of documentation generated during these inspections are critical to the allocation of Department of Transportation construction, maintenance, and rehabilitation resources. Routine inspections are typically completed using only the visual inspection technique and rely heavily on subjective assessments made by bridge inspectors. In light of this, and given the fact that visual inspection may have other limitations that influence its reliability, the Federal Highway Administration initiated an investigation to examine the reliability of visual inspection as it is currently applied to bridges in the United States. This paper will summarize results from this study related to the accuracy and reliability of routine inspection documentation. A number of important conclusions were developed from the experimental study. Generally, it was found that all structural condition documentation is collected with significant variability. Specifically, 95% of primary element condition ratings for individual bridge components will vary within two rating points of the average and only 68% will vary within one point. Documentation generally collected to support condition ratings also has significant variability as exemplified by the number and types of field notes and photographs taken by inspectors. With respect to the use of element-level inspections, it was found that element usage was generally consistent with the Commonly Recognized Element Guide. However, there is significant variability in the condition state assignments of those elements and in some cases the condition states are not applied correctly to particular elements.     

Application of the ART-2a algorithm to laser ablation aerosol mass spectrometry of particle standards

Single-particle mass spectrometers are now commonly used to analyze atmospheric particles and generate tens of thousands of spectra from typical measurement campaigns. The ART-2a spectrum algorithm has been used to classify these spectra. In this work, we generate a range of particles that are models of those that are common in the atmosphere. A single-particle mass spectrometer is used to analyze these known particles, and the spectra are classified using ART-2a. The optimum vigilance parameter is approximately 0.5 while the optimum learning rate is approximately 0.05. The classifications elucidate limitations in generation of test particles, their analysis by single-particle techniques, and their classification by ART-2a.     

Parent and child stress and symptoms: An integrative analysis.

This study assessed major and daily stressful life events and psychological symptoms in a sample of young adolescents and their parents. The relation between major life events and symptoms was mediated by daily stressors for parents and their young adolescent children. Children's emotional and behavioral problems were associated with fathers' psychological symptoms but not with mothers' symptoms. Both mothers' and fathers' symptoms were associated with their sons' daily stressors, but girls' daily stressors were related only to their mothers' symptoms. Mothers' symptoms were associated with their husbands' daily hassles in families of young adolescent boys, and both parents' symptoms were associated with their spouses' hassles in families of adolescent girls. Highlights the importance of studying stress processes between individuals. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Where's poppa? The relative lack of attention to the role of fathers in child and adolescent psychopathology.

Compared with mothers, fathers are dramatically underrepresented in clinical child and adolescent research. The author reviewed empirical and theoretical clinical child and adolescent literature to ascertain the reasons for this underrepresentation. Four somewhat interrelated factors are discussed: practical issues in participant recruitment, differential base rates of paternal vs maternal psychopathology, theory-driven research based on sexist theories, and research assumptions based on outdated societal norms. Suggestions for future research are discussed, including parallel investigations of paternal characteristics whenever maternal characteristics are investigated, assessment of both similarities and differences in the role of fathers and mothers in child and adolescent psychopathology, and investigation of parenting factors for both fathers and mothers (e.g., time spent in actual caretaking, career vs family orientation) in relation to child and adolescent psychopathology. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Risk factors for emotional/behavioral problems in young adolescents: A prospective analysis of adolescent and parental stress and symptoms.

Stressful events in the lives of 309 10- to 15-year-olds and stressful events and psychological symptoms reported by their parents were examined in a 9-month study. Ss' self-reported emotional/behavioral problems were predicted by their reports of stressful events and their fathers' reports of psychological symptoms in cross-sectional analyses. Analyses at follow-up after controlling for initial reports of emotional/behavioral problems and prospective analyses predicting from first assessment to follow-up yielded significant effects for Ss' self-reported stressful events. Mothers' reports of children's problems were predicted by mothers' psychological symptoms in cross-sectional analyses and at follow-up after controlling for initial emotional/behavioral problems. Only prior levels of maternal reports of emotional/behavioral problems predicted mothers' reports of their children's problems 9 months later. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Visual Inspection of Highway Bridges

The Federal Highway Administration recently conducted an investigation to assess the reliability of visual inspection of highway bridges as implemented by state departments of transportation. The study focused on routine and in-depth inspection, the two most prevalent forms of visual inspection of bridges. Because visual inspection is a highly subjective nondestructive evaluation technique, the results of these bridge inspections can be highly variable and are dependent on many factors. This study included the completion of 10 bridge inspection tasks by 49 practicing state bridge inspectors. With regard to routine inspections, this study showed that condition ratings are assigned with significant variability. Specifically, approximately 68% of condition ratings are within 1 rating point of the average. The results of the in-depth superstructure inspections indicated that these inspections are not likely to detect and identify the specific types of defects for which this inspection procedure is sometimes prescribed. Specifically, widespread defects such as those normally noted during a routine inspection are likely to be noted; however, local deficiencies, such as crack indications, are unlikely to be detected. The results of the deck delamination survey indicate that the accuracy of this type of inspection is relatively poor, with few inspection teams providing results that could be considered to accurately portray the condition of the deck.     

Fathers' ratings in the assessment of their child's anxiety symptoms: A comparison to mothers' ratings and their associations with paternal symptomatology.

We examined the comparability between mothers' and fathers' ratings in the assessment of their child's anxiety symptoms. The sample consisted of 78 youth (6 to 17 years) and their mothers and fathers who presented to a childhood anxiety disorders specialty research clinic. Using intraclass correlation coefficients, mother?father agreement of their child's anxiety symptoms was found to be moderate. Mean differences between mothers' and fathers' ratings of their child's anxiety were not significantly different. Both maternal and paternal self-ratings of psychopathology predicted respective ratings of their child's anxiety. Although either mothers or fathers can provide useful information, use of multiple informants is encouraged, especially when parental psychopathology is present. Additional implications and suggestions for future research are discussed. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Dynamic Effects in Microparticle Pull-Off Using an AFM

We report a series of measurements aimed at understanding the dynamics of microparticle detachment from surfaces. Microparticles were adhered to AFM cantilever tips and load/displacement curves were obtained while the particles were repeatedly attached and detached from the surface with frequencies ranging from 1 to 30 Hz. Particles ranging in size from 1 to 30 micrometers and composed of alumina and polystyrene were studied. For each particle studied, a decrease in the pull-off force was consistently observed with increasing measurement frequency, indicating a dynamic effect that is not accounted for by equilibrium adhesion models. We present a lumped mass model of the canitilever/particle/surface system to definitively rule out the possibility that bulk inertial effects within the particle or cantilever may be responsible at these time scales. Furthermore, we ensured dry conditions for each experiment making it unlikely that humidity effects, such as water bridge formation, could have been responsible. Although we have not pinpointed the physical nature of the dynamics, we offer the possibility that energy dissipation mechanisms at the particle/surface interface may cause dynamic effects during microparticle attachment or detachment on time scales similar to those of the present experiments.     

Adolescents' subjective distress over their emotional/behavioral problems.

This study analyzed the relations among 151 7th- and 8th-grade adolescents' self-evaluations of the occurrence of their behavior, their own subjective distress over their behavior, their perceptions of their personal competence, their perceptions of their mothers' and fathers' distress over these behaviors, and their parents' reports of the occurrence of adolescent behaviors. As hypothesized, adolescents' self-reports of occurrence of their behaviors were significantly but moderately correlated with their subjective distress about these behaviors, and adolescents made a distinction between the occurrence of a behavior and their distress about it. Externalizing behaviors were rated by adolescents as more distressing to mothers and to fathers than to adolescents themselves, and conversely, internalizing behaviors were rated as more distressing to self than to parents. Ratings of subjective distress were significantly related to self-perceptions of behavioral conduct and self-worth, whereas parents' ratings of the occurrence of behavior were not related to these self-perceptions. (PsycINFO Database Record (c) 2010 APA, all rights reserved)