Seismic fragility of threaded Tee-joint connections in piping systems

Ju, Bu Seog; Gupta, Abhinav

doi:10.1016/j.ijpvp.2015.06.001

Cited by 33 publications

(10 citation statements)

References 5 publications

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“…Numerical simulations using a nonlinear building-piping model, with and without a bearing system, are often developed using the Open System for Earthquake Engineering Simulation (OpenSees). A nonlinear finite element model for the T-joint connections and bearings were experimentally validated with the experimental results and were incorporated step-by-step into the building-piping model [11][12][13]. A specified value of 2% damping ratio was used for steel structures, while the damping ratio 5% was used for concrete structures.…”

Section: Numerical Modelingmentioning

confidence: 99%

Section: Piping Modelmentioning

confidence: 99%

“…During the tests, the leakage was attributed to slippage and rupture at the T-joint connections. The component-level nonlinear moment-rotation models were validated and developed by Ryu et al [13] and Ju et al [16], and were then applied at each T-joint connection for the system-level model. System-level laboratory tests were also performed as shown in Figure 3b, and a finite element piping model with respect to each recognized failure was validated by Ryu et al [13] using the provided experimental data.…”

Section: Piping Modelmentioning

confidence: 99%

“…Ju et al [16] and Ju and Gupta [11] characterized system failure in terms of the first leakage and, if observed, in terms of the pipe fracture. The characterization of the damage state in the structural components or the system of piping systems in terms of a limit state should be convinced to evaluate the system failure.…”

Section: Characterization Of Damage Statementioning

confidence: 99%

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Fragility Assessments of Multi-Story Piping Systems within a Seismically Isolated Low-Rise Building

Ryu

Kwag

2018

Sustainability

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A successful, advanced safety design method for building and piping structures is related to its functionality and sustainability in beyond-design-basis events such as extremely strong ground motions. This study develops analytical models of seismically isolated building-piping systems in which multi-story piping systems are installed in non-isolated and base-isolated, low-rise buildings. To achieve the sustainable design of a multi-story piping system subjected to strong ground motions, Triple Friction Pendulum (TFP) elements, specifically TFP bearings, were incorporated into the latter building structure. Then, a seismic fragility analysis was performed in consideration of the uncertainty of the seismic ground motions, and the piping fragilities for the seismically non-isolated and the base-isolated building models were quantified. Here, the failure probability of the piping system in the non-isolated building was greater than that in the seismically isolated building. The seismic isolation design of the building improved the sustainability and functionality of the piping system by significantly reducing the seismic energy of extreme ground motions which was input to the building structure itself.

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Section: Numerical Modelingmentioning

confidence: 99%

Section: Piping Modelmentioning

confidence: 99%

Section: Piping Modelmentioning

confidence: 99%

Section: Characterization Of Damage Statementioning

confidence: 99%

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Fragility Assessments of Multi-Story Piping Systems within a Seismically Isolated Low-Rise Building

Ryu

Kwag

2018

Sustainability

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“…Fragility curves are c 2017 Vietnam Academy of Science and Technology also applied to different structural types in the civil engineering field e.g. buildings [2], bridges [3,4], special structures: chimney [5], piping systems [6], tunnels [7], highway and railway embankments and cuts [8], etc. They are useful for the design of a new structure, and for an existing one they are helpful for seismic retrofitting decisions, disaster response planning and quick loss estimation [9].…”

Section: Introductionmentioning

confidence: 99%

Seismic fragility curves based on the probability density evolution method

Dang

Ray

2017

Vietnam J. Mech.

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A seismic fragility curve that shows the probability of failure of a structure in function of a seismic intensity, for example peak ground acceleration (PGA), is a powerful tool for the evaluation of the seismic vulnerability of the structures in nuclear engineering and civil engineering. The common assumption of existing approaches is that the fragility curve is a cumulative probability log-normal function. In this paper, we propose a new technique for construction of seismic fragility curves by numerical simulation using the Probability Density Evolution Method (PDEM). From the joint probability density function between structural response and random variables of a system and/or excitations, seismic fragility curves can be derived without the log-normal assumption. The validation of the proposed technique is performed on two numerical examples.

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