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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of the Earthquake Engineering Society of Korea
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Journal DOI :
Earthquake Engineering Society of Korea
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Volume & Issues
Volume 14, Issue 6 - Dec 2010
Volume 14, Issue 5 - Oct 2010
Volume 14, Issue 4 - Aug 2010
Volume 14, Issue 3 - Jun 2010
Volume 14, Issue 2 - Apr 2010
Volume 14, Issue 1 - Feb 2010
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Effect of Smooth Hysteretic Behavior for Inelastic Response Spectra
Song, Jong-Keol ;
Journal of the Earthquake Engineering Society of Korea, volume 14, issue 1, 2010, Pages 1~9
DOI : 10.5000/EESK.2010.14.1.001
The actual hysteretic behavior of structural elements and systems is closer to smooth hysteretic behavior than piece-wise linear behavior. This paper presents a methodology for computing the constant-ductility inelastic response spectra for smooth hysteretic behaviors. The effect of the hysteretic smoothness on the inelastic response spectra for acceleration, displacement, and input energy is evaluated. The results indicate that increasing smoothness in the hysteretic behavior decreases the inelastic response spectra.
Evaluation of Close-Range Blast Pressure Mitigation using a Sacrificial Member
Shim, Chang-Su ; Yun, Nu-Ri ;
Journal of the Earthquake Engineering Society of Korea, volume 14, issue 1, 2010, Pages 11~23
DOI : 10.5000/EESK.2010.14.1.011
A sacrificial member with aluminum foam of excellent energy absorption capacity was proposed for the protection of significant structures. Parametric studies of explicit finite element analyses were performed to investigate the pressure mitigation of close-range air-blasts. The scaled distance of the blast had a range of Z=0.48~0.95 and an empirical blast load function was utilized. The analytical parameters of the aluminum foam were density, thickness and the existence of a cover sheet. Analytical results showed that the transmitted pressure can be controlled to have a similar level of yield values of the foam by using a foam with low density and higher thickness. As the blast load increased, the sacrificial member needed to have higher density and thickness. A cover sheet of the foam clearly showed its effect on the wider distribution of blast pressure. It is necessary to determine the design parameters of sacrificial foams considering different energy dissipation capacities according to the scaled distance.
A Failure Probability Estimation Method of Nonlinear Bridge Structures using the Non-Gaussian Closure Method
Hahm, Dae-Gi ; Koh, Hyun-Moo ; Park, Kwan-Soon ;
Journal of the Earthquake Engineering Society of Korea, volume 14, issue 1, 2010, Pages 25~34
DOI : 10.5000/EESK.2010.14.1.025
A method is presented for evaluating the seismic failure probability of bridge structures which show a nonlinear hysteretic dynamic behavior. Bridge structures are modeled as a bilinear dynamic system with a single degree of freedom. We regarded that the failure of bridges will occur when the displacement response of a deck level firstly crosses the predefined limit state during a duration of strong motion. For the estimation of the first-crossing probability of a nonlinear structural system excited by earthquake motion, we computed the average frequency of crossings of the limit state. We presented the non-Gaussian closure method for the approximation of the joint probability density function of response and its derivative, which is required for the estimation of the average frequency of crossings. The failure probabilities are estimated according to the various artificial earthquake acceleration sets representing specific seismic characteristics. For the verification of the accuracy and efficiency of presented method, we compared the estimated failure probabilities with the results evaluated from previous methods and the exact values estimated with the crude Monte-Carlo simulation method.
A Study on the Best Estimate of Seismicity Parameter b-Value and Its Application for the Seismic Hazard Analysis of the Korean Peninsula
Seo, Jeong-Moon ; Rhee, Hyun-Me ; Choi, In-Kil ;
Journal of the Earthquake Engineering Society of Korea, volume 14, issue 1, 2010, Pages 35~42
DOI : 10.5000/EESK.2010.14.1.035
The best estimate Gutenberg-Richter b-value of the Korean Peninsula was estimated through an expert panel assigned to evaluate the currently available study results. The panel's assessment yielded that the Gutenberg-Richter b-value was relatively constant over the Korean Peninsula and was independent of seismic zones with an average value of 0.96. Also, the currently most reliable four seismotechtonic structural maps were produced. The effects on the seismic hazard were analyzed by applying the results to the Shinwuljin Units 1&2 NPP site. As a result, the mean hazard level at 0.2g was decreased by about 70-80% (on the order of 0.6-0.7), and the uncertainty band at 0.2g for the reliability band of 15%-85% was significantly reduced. It was proposed, for conservatism, to use b=0.95 over all seismic zones for seismic hazard analysis in the future.
Flexural Behavior of Concrete Beams Reinforced with CFRP rebars
Lee, Young-Hak ; Won, Dong-Min ; Kim, Min-Sook ; Kim, Hee-Cheul ;
Journal of the Earthquake Engineering Society of Korea, volume 14, issue 1, 2010, Pages 43~50
DOI : 10.5000/EESK.2010.14.1.043
To address the problems caused by the corrosion of steel rebar, active research has recently been carried out on members where fiber-reinforced polymer (FRP) is used in place of rebar. As FRP bar is highly brittle and has a low modulus of elasticity, further research is needed on the evaluation of serviceability, in other words on the deflection of flexural concrete members reinforced with FRP rebars. Taking the reinforcement ratio as a variable, this paper analyzes the flexural capacity of concrete beams reinforced with CFRP rebar. The test results of specimens reinforced with CFRP rebar show an increase in stiffness and resisting force along with an increase in the reinforcement ratio. A reinforcement ratio of about 1.3 is needed for the member reinforced with CFRP rebar to show same section property of a steel member. Through a comparison for the value of an effective moment of inertia, the equation suggested by Bischoff & Scanlon predicted values closest to the actual results.
Performance Assessment of Hollow Precast Segmental PSC Bridge Columns
Kim, Tae-Hoon ; Park, Young-Ky ; Kim, Young-Jin ; Shin, Hyun-Mock ;
Journal of the Earthquake Engineering Society of Korea, volume 14, issue 1, 2010, Pages 51~62
DOI : 10.5000/EESK.2010.14.1.051
The purpose of this study was to investigate the performance of hollow precast segmental PSC bridge columns. The proposed system can reduce work at a construction site and makes construction periods shorter. Shortened construction times, in turn, lead to important safety and economic advantages when traffic disruption or rerouting is necessary. Two hollow precast segmental PSC bridge columns were tested under a constant axial load and a quasistatic, cyclically reversed horizontal load. A computer program, RCAHEST (Reinforced Concrete Analysis in Higher Evaluation System Technology), for the analysis of reinforced concrete structures, was used. The proposed numerical method gives a realistic prediction of performance throughout the loading cycles for several test specimens investigated.
Experimental Investigation of The Shear Strengthening of Unreinforced Masonry Infilled RC Frames Using CFRP Sheet
Lee, Young-Hak ; Kim, Min-Sook ; Byon, Eun-Hyuk ; Kim, Hee-Cheul ;
Journal of the Earthquake Engineering Society of Korea, volume 14, issue 1, 2010, Pages 63~70
DOI : 10.5000/EESK.2010.14.1.063
The purpose of this study is to investigate experimentally the behavior of unreinforced masonry RC frames strengthened by CFRP sheet under cyclic lateral loading. Four test specimens were constructed as one-story, one-bay, 1/2 scale unreinforced masonry infilled RC frames and differences in strength and stiffness were evaluated in specimens on which had been applied different retrofitting methods. Test results indicated that the CFRP sheets significantly increased the strength and stiffness of the specimens, and the specimens retrofitted in columns and masonry indicated the most adequate retrofitting methods.