Bending Behavior of Steel Pipe Girders Filled with Ultralight Mortar

Nakamura, Shingo; Hosaka, Tetsuya; Nishiumi, Kenji

doi:10.1061/(asce)1084-0702(2004)9:3(297)

Cited by 21 publications

(7 citation statements)

References 2 publications

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“…The tests presented in this section, performed by Nakamura et al [8], Stroh et al [9], and Papastergiou and Lebet [10] show that the neutral axis location is sensitive to damage and deterioration, especially if there is concrete cracking or delamination. Nakamura et al [8] also correlated the neutral axis location with structural performance and capacity.…”

Section: Laboratory Tests and Controlled Environmentsmentioning

confidence: 76%

“…Nakamura et al [8] installed seven strain gauges at midspan of steel pipes filled with different types of mortar. The cross-section of the pipes was circular, and five strain gauges were installed on the steel and two were embedded in the mortar.…”

Section: Laboratory Tests and Controlled Environmentsmentioning

confidence: 99%

“…P d design load, P y yield load, P max maximum load. Figures modified from Nakamura et al [8] J Civil Struct Health Monit was precast with a groove on the bottom. The steel girders and concrete slab were connected by placing the steel plate in the concrete groove and injecting grout for a tight fit.…”

Section: Laboratory Tests and Controlled Environmentsmentioning

confidence: 99%

“…Nakamura et al [8] also correlated the neutral axis location with structural performance and capacity. In all cases, the neutral axis is evaluated deterministically with no uncertainty analysis.…”

Section: Laboratory Tests and Controlled Environmentsmentioning

confidence: 99%

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The neutral axis location for structural health monitoring: an overview

Sigurdardottir

Glišić

2015

J Civil Struct Health Monit

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Structural health monitoring (SHM) is the process of continuously or periodically measuring structural parameters over time and the transformation of the acquired data into information about the actual structural behavior. The main goal of SHM is to provide quantitative and actionable information to infrastructure managers on a system-wide level. However, to achieve this goal, damage sensitive universal parameters need to be researched, identified, and implemented into SHM processes and data analysis. The neutral axis location has been identified as a potential parameter for damage detection, performance evaluation, and condition assessment of beam-like structures. This paper is intended to serve as a reference for researchers who are interested in the state of the art in evaluation of the neutral axis location, facts about the neutral axis behavior, and challenges associated with using the neutral axis for SHM purposes. Studies of the neutral axis in laboratory settings, controlled on-site testing, and on real structures in on-site conditions are presented and discussed. The main difficulties in using the neutral axis location for SHM purposes that are identified in this paper are: (1) its sensitivity to environmental effects such as temperature, humidity, and loading positions, (2) its natural variation in healthy cross-sections, (3) quantification of its sensitivity to damage, i.e. its damage detection capabilities in terms of the damage size and its distance from sensors, and (4) correlation between the neutral axis location and the capacity, performance, and condition of the monitored structure. The proof of concept has been provided with numerical modeling, and in the laboratory, and to some extent through controlled testing; however, a general onsite validation still remains a major challenge.

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Section: Laboratory Tests and Controlled Environmentsmentioning

confidence: 76%

Section: Laboratory Tests and Controlled Environmentsmentioning

confidence: 99%

Section: Laboratory Tests and Controlled Environmentsmentioning

confidence: 99%

Section: Laboratory Tests and Controlled Environmentsmentioning

confidence: 99%

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The neutral axis location for structural health monitoring: an overview

Sigurdardottir

Glišić

2015

J Civil Struct Health Monit

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“…The distance between the two webs is narrower than that of the conventional steel box girder and hence we call it a the narrow-width steel box girder. Light concrete, light aggregate concrete or air mortar is filled inside the box girder at the intermediate supports of the continuous girder [1,2]. As bending moments and shear forces are largest at the intermediate supports, the filled concrete contributes to resist them.…”

Section: Introductionmentioning

confidence: 99%

Bending strength of concrete-filled narrow-width steel box girder

Nakamura¹,

Morishita²

2008

Journal of Constructional Steel Research

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Long‐term performance monitoring and assessment of concrete beam bridges using neutral axis indicator

Xia

Lei

Wang³

et al. 2020

Struct Control Health Monit

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Long-term performance of existing bridge structures provides stakeholders with information that facilitates decision making for reasonable and optimal maintenance and management. The neutral axis (NA) is a potentially reliable and robust indicator to evaluate bridge performance since it depends on the loss of elastic modulus or effective sectional area. In this study, the NA indicator is defined and derived, and it is combined with the statistical characteristics of the NA distribution, to assess long-term structural performance. A systematic long-term performance assessment framework based on NA is also proposed. The NA is estimated from strain measurements and related practical signal processing methods. To validate the proposed framework, strain signals acquired from a preinstalled structural health monitoring system on an existing concrete beam bridge were analyzed. For the long-term performance assessment, an NA database was established. The statistical characteristics of the NA sample in the daily evaluation cycle were obtained to evaluate the performance. The results show that different cross sections have their own estimated NA; and during the monitoring period, the NA indicators fluctuate within a reasonable range. With the increase of monitoring data, these results can be continually updated. It can be concluded that the proposed NA indicator, along with the related framework, can be employed effectively in the condition assessment of concrete box girder bridges for long-term health monitoring.

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Bending Behavior of Steel Pipe Girders Filled with Ultralight Mortar

Cited by 21 publications

References 2 publications

The neutral axis location for structural health monitoring: an overview

The neutral axis location for structural health monitoring: an overview

Bending strength of concrete-filled narrow-width steel box girder

Long‐term performance monitoring and assessment of concrete beam bridges using neutral axis indicator

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