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The dynamic responses of a concrete rectangular liquid storage tank on the surface of rigid soil subjected to three-directional earthquake ground motion are investigated with material nonlinearity taken into consideration. Material nonlinearity in concrete is considered using the concrete damage plasticity model. The hydrodynamic pressure due to earthquake ground motion is considered using a finite-element solution of the governing equation for an inviscid and incompressible ideal fluid with the fluid–structure interaction taken into consideration. It was observed from the dynamic analyses that the effects of material nonlinearity and directionality significantly affect the earthquake responses of the considered system. The relative displacement of the structure increased significantly by the nonlinearity of the material. Inclined cracks due to the increased displacement were observed on the long-sided walls. The hydrodynamic pressure can be reduced significantly by the material nonlinearity and is influenced by the directionality of an earthquake’s ground motion. The base shear and overturning moment due to the hydrodynamic pressure and the resulting impulsive mass and corresponding height for a simplified mass-spring analogy are also affected. Because the directionality was observed to have a significant influence on the peak value of the sloshing height, it must be estimated with the directionality considered.
Chae-Been Lee; Jin-Ho Lee. Nonlinear Dynamic Response of a Concrete Rectangular Liquid Storage Tank on Rigid Soil Subjected to Three-Directional Ground Motion. Applied Sciences 2021, 11, 4688 .
AMA StyleChae-Been Lee, Jin-Ho Lee. Nonlinear Dynamic Response of a Concrete Rectangular Liquid Storage Tank on Rigid Soil Subjected to Three-Directional Ground Motion. Applied Sciences. 2021; 11 (10):4688.
Chicago/Turabian StyleChae-Been Lee; Jin-Ho Lee. 2021. "Nonlinear Dynamic Response of a Concrete Rectangular Liquid Storage Tank on Rigid Soil Subjected to Three-Directional Ground Motion." Applied Sciences 11, no. 10: 4688.
Ground motion response spectra (GMRS) at rock/soil sites in regions where earthquake ground motions have dominant contents at high frequencies of 10 Hz or more are evaluated and the effects of soil amplification on the GMRS are studied. The seismic hazard levels at the soil sites are estimated from soil amplification functions and hazard curves for rock outcrop motions. The soil amplification functions are obtained using modified earthquake ground motions which match the uniform hazard response spectra (UHRS) for rock outcrop motions with various mean annual frequencies of exceedance in order to consider the effects of earthquake ground motions consistently in a site response analysis. UHRS at soil sites are determined from the calculated seismic hazard curves. Subsequently, design factors, which will be applied to UHRS, and the corresponding GMRS are evaluated such that the seismic risk for the structures, systems, and components of nuclear facilities would be equal to a target seismic risk. It can be observed from example applications that the UHRS and GMRS at soil sites have peaks at the natural frequencies of the soil, where the soil responses are amplified. Amplification at soil sites depends on the frequency contents of rock outcrop motions.
Jin Ho Lee; Hieu Van Nguyen; In-Kil Choi; Jung Han Kim. Effects of Soil Amplification on Ground Motion Response Spectra with High-Frequency Contents at Generic Soil Sites for Nuclear Facilities in Korea. KSCE Journal of Civil Engineering 2021, 25, 2394 -2410.
AMA StyleJin Ho Lee, Hieu Van Nguyen, In-Kil Choi, Jung Han Kim. Effects of Soil Amplification on Ground Motion Response Spectra with High-Frequency Contents at Generic Soil Sites for Nuclear Facilities in Korea. KSCE Journal of Civil Engineering. 2021; 25 (7):2394-2410.
Chicago/Turabian StyleJin Ho Lee; Hieu Van Nguyen; In-Kil Choi; Jung Han Kim. 2021. "Effects of Soil Amplification on Ground Motion Response Spectra with High-Frequency Contents at Generic Soil Sites for Nuclear Facilities in Korea." KSCE Journal of Civil Engineering 25, no. 7: 2394-2410.
Jin Ho Lee. Consistent Boundary Condition for Horizontally-Polarized Shear (SH) Waves Propagated in Layered Waveguides. Journal of the Computational Structural Engineering Institute of Korea 2021, 34, 113 -120.
AMA StyleJin Ho Lee. Consistent Boundary Condition for Horizontally-Polarized Shear (SH) Waves Propagated in Layered Waveguides. Journal of the Computational Structural Engineering Institute of Korea. 2021; 34 (2):113-120.
Chicago/Turabian StyleJin Ho Lee. 2021. "Consistent Boundary Condition for Horizontally-Polarized Shear (SH) Waves Propagated in Layered Waveguides." Journal of the Computational Structural Engineering Institute of Korea 34, no. 2: 113-120.
When a seismic force acts on bridges, the pier can be damaged by the horizontal inertia force of the superstructure. To prevent this failure, criteria for seismic reinforcement details have been developed in many design codes. However, in moderate seismicity regions, many existing bridges were constructed without considering seismic detail because the detailed seismic design code was only applied recently. These existing structures should be retrofitted by evaluating their seismic performance. Even if the seismic design criteria are not applied, it cannot be concluded that the structure does not have adequate seismic performance. In particular, the performance of a lap-spliced reinforcement bar at a construction joint applied by past practices cannot be easily evaluated analytically. Therefore, experimental tests on the bridge piers considering a non-seismic detail of existing structures need to be performed to evaluate the seismic performance. For this reason, six small scale specimens according to existing bridge piers were constructed and seismic performances were evaluated experimentally. The three types of reinforcement detail were adjusted, including a lap-splice for construction joints. Quasi-static loading tests were performed for three types of scale model with two-column piers in both the longitudinal and transverse directions. From the test results, the effect on the failure mechanism of the lap-splice and transverse reinforcement ratio were investigated. The difference in failure characteristics according to the loading direction was investigated by the location of plastic hinges. Finally, the seismic capacity related to the displacement ductility factor and the absorbed energy by hysteresis behavior for each test were obtained and discussed.
Jung Kim; Ick-Hyun Kim; Jin Lee. Experimental Study on the Behavior of Existing Reinforced Concrete Multi-Column Piers under Earthquake Loading. Applied Sciences 2021, 11, 2652 .
AMA StyleJung Kim, Ick-Hyun Kim, Jin Lee. Experimental Study on the Behavior of Existing Reinforced Concrete Multi-Column Piers under Earthquake Loading. Applied Sciences. 2021; 11 (6):2652.
Chicago/Turabian StyleJung Kim; Ick-Hyun Kim; Jin Lee. 2021. "Experimental Study on the Behavior of Existing Reinforced Concrete Multi-Column Piers under Earthquake Loading." Applied Sciences 11, no. 6: 2652.
Jin Ho Lee. Deflection Limit for a Maglev Railway Guideway Considering Ride Comfort. Journal of the Computational Structural Engineering Institute of Korea 2020, 33, 367 -374.
AMA StyleJin Ho Lee. Deflection Limit for a Maglev Railway Guideway Considering Ride Comfort. Journal of the Computational Structural Engineering Institute of Korea. 2020; 33 (6):367-374.
Chicago/Turabian StyleJin Ho Lee. 2020. "Deflection Limit for a Maglev Railway Guideway Considering Ride Comfort." Journal of the Computational Structural Engineering Institute of Korea 33, no. 6: 367-374.
A root‐finding absorbing boundary condition (RFABC) for scalar‐wave‐propagation problems in infinite anisotropic media was developed. Although the phase velocity and the group velocity in isotropic media have the same sign, the sign of the latter can differ from that of the former in anisotropic media. Therefore, a RFABC for anisotropic scalar waves consistent with the group velocity of the considered media is developed, as the velocity is closely related to the direction of energy propagation. The developed boundary condition is shown to satisfy a criterion for an “enough accurate” boundary condition. The well‐posedness of the boundary condition is proven at the continuous level. Its finite‐element formulation, which ensures well‐posedness at a discrete level, is derived, after which it is demonstrated that accurate and stable solutions to the problem of antiplane shear‐wave propagation in an anisotropic elastic waveguide, an example of anisotropic scalar‐wave propagation, can be obtained using the proposed numerical approach.
Jin Ho Lee. Root‐finding absorbing boundary condition for anisotropic scalar waves in infinite media. International Journal for Numerical Methods in Engineering 2020, 122, 1031 -1050.
AMA StyleJin Ho Lee. Root‐finding absorbing boundary condition for anisotropic scalar waves in infinite media. International Journal for Numerical Methods in Engineering. 2020; 122 (4):1031-1050.
Chicago/Turabian StyleJin Ho Lee. 2020. "Root‐finding absorbing boundary condition for anisotropic scalar waves in infinite media." International Journal for Numerical Methods in Engineering 122, no. 4: 1031-1050.
In this study, a root-finding absorbing boundary condition (RFABC) for wave-propagation problems in infinite poroelastic media is developed. In order to express the boundary condition in terms of local temporal operators in the time domain, poroelastic media with infinite permeability are assumed and dynamic motions in the media are described using four scalar potentials for two dilatational and two rotational waves. The four potentials can be expressed in terms of three independent non-dispersive P1, P2, and S waves. The existing approach of an RFABC for scalar waves is then applied to each wave component and the desired boundary condition for poroelastic waves is derived. The accuracy and stability of the developed boundary condition are verified at the continuous level. Its discretized version is formulated using the finite-element approach and stability at the discrete level is proved. The proposed numerical approach is applied to wave-propagation problems in a poroelastic waveguide. It is demonstrated that the developed boundary condition can produce accurate and stable results for problems in poroelastic media with finite as well as infinite permeability.
Jin Ho Lee. Root-finding absorbing boundary condition for poroelastic wave propagation in infinite media. Soil Dynamics and Earthquake Engineering 2019, 129, 105933 .
AMA StyleJin Ho Lee. Root-finding absorbing boundary condition for poroelastic wave propagation in infinite media. Soil Dynamics and Earthquake Engineering. 2019; 129 ():105933.
Chicago/Turabian StyleJin Ho Lee. 2019. "Root-finding absorbing boundary condition for poroelastic wave propagation in infinite media." Soil Dynamics and Earthquake Engineering 129, no. : 105933.
Root-Finding Absorbing Boundary Conditions (RFABCs) for scalar and elastic waves in infinite media are developed. First, the existing RFABC formulation for scalar-wave propagation problems is refined. Specifically, a Fourier series expansion or an eigenfunction expansion, as in Sturm–Liouville problems, is applied to general scalar-wave fields and a consistent nodal flux is derived for eventual combination with the discrete representation of the problem under consideration. This newly-proposed approach for scalar waves is extended to elastic waves, governed by two scalar-wave equations for pressure and shear waves. Stability of the refined RFABCs can be proven at both the continuous and discrete levels. The newly-developed RFABCs for scalar and elastic waves are applied to various wave-propagation problems. It is verified that they produce accurate and stable results. Perfectly-matched layers and high-order absorbing boundary conditions are the most popular of the available tools for wave-propagation problems. But, their stability properties have not been established in applications to problems of elastic waves in waveguides. It is expected that existing high-order absorbing boundaries will lead to stable results for elastic waves in waveguides, when implemented using the technique proposed in the present study.
Jin Ho Lee; John L. Tassoulas. Root-finding absorbing boundary conditions for scalar and elastic waves in infinite media. Computer Methods in Applied Mechanics and Engineering 2018, 346, 592 -611.
AMA StyleJin Ho Lee, John L. Tassoulas. Root-finding absorbing boundary conditions for scalar and elastic waves in infinite media. Computer Methods in Applied Mechanics and Engineering. 2018; 346 ():592-611.
Chicago/Turabian StyleJin Ho Lee; John L. Tassoulas. 2018. "Root-finding absorbing boundary conditions for scalar and elastic waves in infinite media." Computer Methods in Applied Mechanics and Engineering 346, no. : 592-611.