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Steel intermediate moment frames (SIMFs) with column-tree connections have an advantage in that they can ensure quality control and decrease construction cost and time by the factory welding of stub beams to columns and field bolting at the beam splice. Furthermore, the amount of steel can be reduced by distributing the seismic lateral load to the entire frame, for which beam-to-column joints are fully restrained. Despite such merits, concerns about slip at the beam splice and concentrated deformation in the weak panel zone also exist. Therefore, the influence of beam splice slip and weak panel zone deformation on the seismic performance of the SIMF with column-tree connections was examined numerically by seismic fragility assessment. For comparison, the seismic fragility of a SIMF with conventional field-welded connections was also examined. The result showed that the beams and panel zones share energy absorption in the SIMF with column-tree connections, even though the panel zones are weaker than the beams, because the beam splice slip can reduce the concentration of deformation on the weak panel zone. The collapse probability of a SIMF with column-tree connections is expected to be reduced to a value as low as a SIMF with conventional connections if the quality of test data and modeling are improved.
Eunjong Yu; Taewan Kim; Ji-Hun Park. Seismic fragility analysis of steel intermediate moment frames with column-tree connections. Journal of Building Engineering 2021, 44, 102955 .
AMA StyleEunjong Yu, Taewan Kim, Ji-Hun Park. Seismic fragility analysis of steel intermediate moment frames with column-tree connections. Journal of Building Engineering. 2021; 44 ():102955.
Chicago/Turabian StyleEunjong Yu; Taewan Kim; Ji-Hun Park. 2021. "Seismic fragility analysis of steel intermediate moment frames with column-tree connections." Journal of Building Engineering 44, no. : 102955.
A technique for strengthening masonry walls by plastering with amorphous steel fiber-reinforced mortar (ASFRM) is investigated through compressive and diagonal tension tests for masonry prisms. The vertical joint between masonry units was not completely filled with mortar to mimic poor workmanship, which is typically reflected in low-cost buildings. The test variables include the number and thickness of mortar overlays, fiber volume fraction, and additional reinforcement using glass fiber mesh or shear connectors. In most strengthened specimens, the ASFRM is not damaged but separated from the masonry prisms after its maximum strength is reached. Additional tests for the bond strength between the ASFRM overlay and masonry surface are conducted to evaluate its contribution to the strengthening effects. Based on experimental observations, equations for predicting the compressive and diagonal tension strengths of masonry prisms strengthened with ASFRM are proposed. The compressive strength can be predicted more accurately by considering the asymmetrical distribution of compressive stress when strengthening is performed on only one side. The diagonal tension strength after strengthening can be predicted by incorporating the contribution of the bond strength between the ASFRM overlay and masonry prism to the initial strength.
Ji-Hoon Yu; Ji-Hun Park. Compressive and Diagonal Tension Strengths of Masonry Prisms Strengthened with Amorphous Steel Fiber-Reinforced Mortar Overlay. Applied Sciences 2021, 11, 5974 .
AMA StyleJi-Hoon Yu, Ji-Hun Park. Compressive and Diagonal Tension Strengths of Masonry Prisms Strengthened with Amorphous Steel Fiber-Reinforced Mortar Overlay. Applied Sciences. 2021; 11 (13):5974.
Chicago/Turabian StyleJi-Hoon Yu; Ji-Hun Park. 2021. "Compressive and Diagonal Tension Strengths of Masonry Prisms Strengthened with Amorphous Steel Fiber-Reinforced Mortar Overlay." Applied Sciences 11, no. 13: 5974.
Ji-Hoon Yu; Seong-Jin Myeong; Ji-Hun Park. Enhancement of Compressive and Shear Strength for Concrete Masonry Prisms with Steel Fiber-Reinforced Mortar Overlay. Journal of the Earthquake Engineering Society of Korea 2021, 25, 21 -32.
AMA StyleJi-Hoon Yu, Seong-Jin Myeong, Ji-Hun Park. Enhancement of Compressive and Shear Strength for Concrete Masonry Prisms with Steel Fiber-Reinforced Mortar Overlay. Journal of the Earthquake Engineering Society of Korea. 2021; 25 (1):21-32.
Chicago/Turabian StyleJi-Hoon Yu; Seong-Jin Myeong; Ji-Hun Park. 2021. "Enhancement of Compressive and Shear Strength for Concrete Masonry Prisms with Steel Fiber-Reinforced Mortar Overlay." Journal of the Earthquake Engineering Society of Korea 25, no. 1: 21-32.
This study addresses the effect of boundary confinement on the ductility of shear walls considering various rebar hoop details. Eight walls were tested under cyclic lateral loads. The major test parameters were the type of vertical reinforcement (seismic or non-seismic grade rebar) and the type and spacing of the confinement rebar details (special details (ACI 318-19) or simplified details). The test results showed that the use of confinement hoops increased the deformation capacity of the wall specimens. Although use of the simplified rebar details also increased deformation capacity, they were not as effective as the special details. Furthermore, as the concrete strength increased, the deformation capacity also increased. On the other hand, use of seismic grade rebar did not significantly affect deformation capacity because the walls failed due to concrete crushing in the compression zone before the vertical rebar experienced a large degree of inelastic deformation or tensile fracture. The axial strain capacity of concrete according to the confinement details was investigated based on existing and present test results.
Sung-Hyun Kim; Eun-Kyung Lee; Su-Min Kang; Hong-Gun Park; Ji-Hun Park. Effect of boundary confinement on ductility of RC walls. Engineering Structures 2020, 230, 111695 .
AMA StyleSung-Hyun Kim, Eun-Kyung Lee, Su-Min Kang, Hong-Gun Park, Ji-Hun Park. Effect of boundary confinement on ductility of RC walls. Engineering Structures. 2020; 230 ():111695.
Chicago/Turabian StyleSung-Hyun Kim; Eun-Kyung Lee; Su-Min Kang; Hong-Gun Park; Ji-Hun Park. 2020. "Effect of boundary confinement on ductility of RC walls." Engineering Structures 230, no. : 111695.
A strengthening method using steel fiber-reinforced mortar (SFRM), proposed for the seismic retrofit of masonry buildings, is verified experimentally in this study. The SFRM is overlaid on masonry walls directly, which is possible to implement while the building is occupied for residence. First, tests of workability and material strengths were conducted for SFRM itself in order to find SFRM mixing ratios appropriate for overlay construction and strengthening. Then, masonry prisms were produced using two types of bricks and strengthened with SFRM for the chosen mixing ratios and test variables such as the number of overlaid sides and the fiber volume fraction. Compressive strength tests and diagonal tension tests for those specimens were conducted. Both compressive and shear strengths were improved the most highly by overlaying the SFRM with a fiber volume fraction of 1.3%, which is the highest among the test variables, on both sides. Overlaid SFRM tends to be detached without cracking almost at the maximum strength in both compression and diagonal tension tests. For red clay brick prisms, the compressive and shear strengths increased by up to 61% and 138%, respectively. For concrete brick prisms, the compressive and shear strengths increased by up to 26% and 67%. Finally, a design formula for the shear strength of strengthened masonry prisms is compared with the experimental results, and it is observed that the design formula gives slightly higher results.
Ji-Hoon Yu; Ji-Hun Park. Investigation of Steel Fiber-Reinforced Mortar Overlay for Strengthening Masonry Walls by Prism Tests. Applied Sciences 2020, 10, 6395 .
AMA StyleJi-Hoon Yu, Ji-Hun Park. Investigation of Steel Fiber-Reinforced Mortar Overlay for Strengthening Masonry Walls by Prism Tests. Applied Sciences. 2020; 10 (18):6395.
Chicago/Turabian StyleJi-Hoon Yu; Ji-Hun Park. 2020. "Investigation of Steel Fiber-Reinforced Mortar Overlay for Strengthening Masonry Walls by Prism Tests." Applied Sciences 10, no. 18: 6395.
The seismic performance of ordinary reinforced concrete shear walls, that are commonly used in high-rise residential buildings in Korea (h < 60 m), but are prohibited for tall buildings (h ≥ 60 m), is evaluated in this research project within the framework of collapse probability. Three bidimensional analytical models comprised of both coupled and uncoupled shear walls exceeding 60 m in height were designed using nonlinear dynamic analysis in accordance with Korean performance-based seismic design guidelines. Seismic design based on nonlinear dynamic analysis was performed using different shear force amplification factors in order to determine an appropriate factor. Then, an incremental dynamic analysis was performed to evaluate collapse fragility in accordance with the (Federal Emergency Management Agency) FEMA P695 procedure. Four engineering demand parameters including inter-story drift, plastic hinge rotation angle, concrete compressive strain and shear force were introduced to investigate the collapse probability of the designed analytical models. For all analytical models, flexural failure was the primary failure mode but shear force amplification factors played an important role in order to meet the requirement on collapse probability. High-rise ordinary reinforced concrete shear walls designed using seven pairs of ground motion components and a shear force amplification factor ≥ 1.2 were adequate to satisfy the criteria on collapse probability and the collapse margin ratio prescribed in FEMA P695.
Seong-Ha Jeon; Ji-Hun Park. Seismic Fragility of Ordinary Reinforced Concrete Shear Walls with Coupling Beams Designed Using a Performance-Based Procedure. Applied Sciences 2020, 10, 1 .
AMA StyleSeong-Ha Jeon, Ji-Hun Park. Seismic Fragility of Ordinary Reinforced Concrete Shear Walls with Coupling Beams Designed Using a Performance-Based Procedure. Applied Sciences. 2020; 10 (12):1.
Chicago/Turabian StyleSeong-Ha Jeon; Ji-Hun Park. 2020. "Seismic Fragility of Ordinary Reinforced Concrete Shear Walls with Coupling Beams Designed Using a Performance-Based Procedure." Applied Sciences 10, no. 12: 1.
Seong-Ha Jeon; Ji-Hun Park. Approximate Analysis for Shear Force Amplification Effect in Ordinary RC Shear Walls. Journal of the Earthquake Engineering Society of Korea 2020, 24, 129 -139.
AMA StyleSeong-Ha Jeon, Ji-Hun Park. Approximate Analysis for Shear Force Amplification Effect in Ordinary RC Shear Walls. Journal of the Earthquake Engineering Society of Korea. 2020; 24 (3):129-139.
Chicago/Turabian StyleSeong-Ha Jeon; Ji-Hun Park. 2020. "Approximate Analysis for Shear Force Amplification Effect in Ordinary RC Shear Walls." Journal of the Earthquake Engineering Society of Korea 24, no. 3: 129-139.
Yun Jeong Seol; Ji-Hun Park. Seismic Performance Evaluation of Unreinforced Masonry Buildings Retrofitted by Strengthening External Walls. Journal of the Earthquake Engineering Society of Korea 2020, 24, 77 -86.
AMA StyleYun Jeong Seol, Ji-Hun Park. Seismic Performance Evaluation of Unreinforced Masonry Buildings Retrofitted by Strengthening External Walls. Journal of the Earthquake Engineering Society of Korea. 2020; 24 (2):77-86.
Chicago/Turabian StyleYun Jeong Seol; Ji-Hun Park. 2020. "Seismic Performance Evaluation of Unreinforced Masonry Buildings Retrofitted by Strengthening External Walls." Journal of the Earthquake Engineering Society of Korea 24, no. 2: 77-86.
Won Ho Park; Ji-Hun Park. Seismic Fragility Assessment of NPP Containment Structure based on Conditional Mean Spectra for Multiple Earthquake Scenarios. Journal of the Earthquake Engineering Society of Korea 2019, 23, 301 -309.
AMA StyleWon Ho Park, Ji-Hun Park. Seismic Fragility Assessment of NPP Containment Structure based on Conditional Mean Spectra for Multiple Earthquake Scenarios. Journal of the Earthquake Engineering Society of Korea. 2019; 23 (6):301-309.
Chicago/Turabian StyleWon Ho Park; Ji-Hun Park. 2019. "Seismic Fragility Assessment of NPP Containment Structure based on Conditional Mean Spectra for Multiple Earthquake Scenarios." Journal of the Earthquake Engineering Society of Korea 23, no. 6: 301-309.
Beom Seok Kim; Ji-Hun Park. Response Modification Factors of Non-seismic School Buildings Considering Short Column Effects and Natural Period. Journal of the Earthquake Engineering Society of Korea 2019, 23, 201 -209.
AMA StyleBeom Seok Kim, Ji-Hun Park. Response Modification Factors of Non-seismic School Buildings Considering Short Column Effects and Natural Period. Journal of the Earthquake Engineering Society of Korea. 2019; 23 (4):201-209.
Chicago/Turabian StyleBeom Seok Kim; Ji-Hun Park. 2019. "Response Modification Factors of Non-seismic School Buildings Considering Short Column Effects and Natural Period." Journal of the Earthquake Engineering Society of Korea 23, no. 4: 201-209.
Seismic hazard levels lower than those for design of new buildings have been permitted for seismic evaluation and retrofit of existing buildings due to the relatively short remaining lifespans. The seismic hazard reduction enables cost-effective seismic evaluation and retrofit of existing buildings with limited structural capacity. The current study proposes seismic hazard reduction factors for Korea, one of low to moderate seismicity regions. The seismic hazard reduction factors are based on equal probabilities of non-exceedance within different remaining building lifespans. A validation procedure is proposed to investigate equality of seismic risk in terms of ductility-based limit states using seismic fragility assessment of nonlinear SDOF systems, of which retrofit demands are determined by the displacement coefficient method of ASCE 41-13 for different target remaining building lifespans and corresponding reduced design earthquakes. Validation result shows that the use of seismic hazard reduction factors can be permitted in conjunction with appropriate lower bounds of the remaining building lifespans.
Ji-Hun Park. Seismic hazard level reduction for existing buildings considering remaining building lifespans. Earthquake Engineering and Engineering Vibration 2019, 18, 649 -661.
AMA StyleJi-Hun Park. Seismic hazard level reduction for existing buildings considering remaining building lifespans. Earthquake Engineering and Engineering Vibration. 2019; 18 (3):649-661.
Chicago/Turabian StyleJi-Hun Park. 2019. "Seismic hazard level reduction for existing buildings considering remaining building lifespans." Earthquake Engineering and Engineering Vibration 18, no. 3: 649-661.
An efficient design procedure for building structures with damping systems is proposed using nonlinear response history analysis permitted in the revised Korean building code, KBC 2016. The goal of the proposed procedure is to design structures with damping systems complying with design requirements of KBC 2016 that do not specify a detailed design method. The proposed design procedure utilizes response reduction factor obtained by a limited number of nonlinear response history analyses of the seismic-force-resisting system with incremental damping ratio substituting damping devices. Design parameters of damping device are determined taking into account structural period change due to stiffness added by damping devices. Two design examples for three-story and six-story steel moment frames with metallic yielding dampers and viscoelastic dampers, respectively, shows that the proposed design procedure can produce design results complying with KBC 2016 without time-consuming iterative computation, predict seismic response accurately, and save structural material effectively.
Seong-Ha Jeon; Ji-Hun Park; Tae-Woong Ha. Seismic Design of Steel Moment-Resisting Frames with Damping Systems in Accordance with KBC 2016. Applied Sciences 2019, 9, 2317 .
AMA StyleSeong-Ha Jeon, Ji-Hun Park, Tae-Woong Ha. Seismic Design of Steel Moment-Resisting Frames with Damping Systems in Accordance with KBC 2016. Applied Sciences. 2019; 9 (11):2317.
Chicago/Turabian StyleSeong-Ha Jeon; Ji-Hun Park; Tae-Woong Ha. 2019. "Seismic Design of Steel Moment-Resisting Frames with Damping Systems in Accordance with KBC 2016." Applied Sciences 9, no. 11: 2317.
Seong-Ha Jeon; Ji-Hun Park. Seismic Fragility Assessment of Ordinary RC Shear Walls Designed with a Nonlinear Dynamic Analysis. Journal of the Earthquake Engineering Society of Korea 2019, 23, 169 -181.
AMA StyleSeong-Ha Jeon, Ji-Hun Park. Seismic Fragility Assessment of Ordinary RC Shear Walls Designed with a Nonlinear Dynamic Analysis. Journal of the Earthquake Engineering Society of Korea. 2019; 23 (3):169-181.
Chicago/Turabian StyleSeong-Ha Jeon; Ji-Hun Park. 2019. "Seismic Fragility Assessment of Ordinary RC Shear Walls Designed with a Nonlinear Dynamic Analysis." Journal of the Earthquake Engineering Society of Korea 23, no. 3: 169-181.
Beom Seok Kim; Ji-Hun Park. Response Modification Factors for Seismic Performance Evaluation of Non-seismic School Buildings with Partial Masonry Infills. Journal of the Earthquake Engineering Society of Korea 2019, 23, 71 -82.
AMA StyleBeom Seok Kim, Ji-Hun Park. Response Modification Factors for Seismic Performance Evaluation of Non-seismic School Buildings with Partial Masonry Infills. Journal of the Earthquake Engineering Society of Korea. 2019; 23 (1):71-82.
Chicago/Turabian StyleBeom Seok Kim; Ji-Hun Park. 2019. "Response Modification Factors for Seismic Performance Evaluation of Non-seismic School Buildings with Partial Masonry Infills." Journal of the Earthquake Engineering Society of Korea 23, no. 1: 71-82.
Cheol-Ho Lee; Sung-Yong Kim; Ji-Hun Park; Dong-Kwan Kim; Tae-Jin Kim; Kyoung-Hoon Park. Comparative Analysis of Structural Damage Potentials Observed in the 9.12 Gyeongju and 11.15 Pohang Earthquakes. Journal of the Earthquake Engineering Society of Korea 2018, 22, 175 -184.
AMA StyleCheol-Ho Lee, Sung-Yong Kim, Ji-Hun Park, Dong-Kwan Kim, Tae-Jin Kim, Kyoung-Hoon Park. Comparative Analysis of Structural Damage Potentials Observed in the 9.12 Gyeongju and 11.15 Pohang Earthquakes. Journal of the Earthquake Engineering Society of Korea. 2018; 22 (3):175-184.
Chicago/Turabian StyleCheol-Ho Lee; Sung-Yong Kim; Ji-Hun Park; Dong-Kwan Kim; Tae-Jin Kim; Kyoung-Hoon Park. 2018. "Comparative Analysis of Structural Damage Potentials Observed in the 9.12 Gyeongju and 11.15 Pohang Earthquakes." Journal of the Earthquake Engineering Society of Korea 22, no. 3: 175-184.
Cheol Ho Lee; Ji-Hun Park; Taejin Kim; Sung-Yong Kim; Dong-Kwan Kim. Damage Potential Analysis and Earthquake Engineering-related Implications of Sep.12, 2016 M5.8 Gyeongju Earthquake. Journal of the Earthquake Engineering Society of Korea 2016, 20, 527 -536.
AMA StyleCheol Ho Lee, Ji-Hun Park, Taejin Kim, Sung-Yong Kim, Dong-Kwan Kim. Damage Potential Analysis and Earthquake Engineering-related Implications of Sep.12, 2016 M5.8 Gyeongju Earthquake. Journal of the Earthquake Engineering Society of Korea. 2016; 20 (7 Special):527-536.
Chicago/Turabian StyleCheol Ho Lee; Ji-Hun Park; Taejin Kim; Sung-Yong Kim; Dong-Kwan Kim. 2016. "Damage Potential Analysis and Earthquake Engineering-related Implications of Sep.12, 2016 M5.8 Gyeongju Earthquake." Journal of the Earthquake Engineering Society of Korea 20, no. 7 Special: 527-536.
Cheol Ho Lee; Ji-Hun Park. Considerations and Suggestions for Expressing of Seismic Capacity of Buildings. Journal of the Earthquake Engineering Society of Korea 2016, 20, 517 -526.
AMA StyleCheol Ho Lee, Ji-Hun Park. Considerations and Suggestions for Expressing of Seismic Capacity of Buildings. Journal of the Earthquake Engineering Society of Korea. 2016; 20 (7):517-526.
Chicago/Turabian StyleCheol Ho Lee; Ji-Hun Park. 2016. "Considerations and Suggestions for Expressing of Seismic Capacity of Buildings." Journal of the Earthquake Engineering Society of Korea 20, no. 7: 517-526.
Seong-Ha Jeon; Ji-Hun Park. Experimental Assessment of Numerical Models for Reinforced Concrete Shear Walls with Deficient Details. Journal of the Earthquake Engineering Society of Korea 2016, 20, 211 -222.
AMA StyleSeong-Ha Jeon, Ji-Hun Park. Experimental Assessment of Numerical Models for Reinforced Concrete Shear Walls with Deficient Details. Journal of the Earthquake Engineering Society of Korea. 2016; 20 (4):211-222.
Chicago/Turabian StyleSeong-Ha Jeon; Ji-Hun Park. 2016. "Experimental Assessment of Numerical Models for Reinforced Concrete Shear Walls with Deficient Details." Journal of the Earthquake Engineering Society of Korea 20, no. 4: 211-222.
Ji-Hun Park; Seong-Ha Jeon; Kyung-Soo Kang. Seismic Performance Evaluation of Masonry-Infilled Frame Structures using Equivalent Strut Models. Journal of the Earthquake Engineering Society of Korea 2012, 16, 47 -59.
AMA StyleJi-Hun Park, Seong-Ha Jeon, Kyung-Soo Kang. Seismic Performance Evaluation of Masonry-Infilled Frame Structures using Equivalent Strut Models. Journal of the Earthquake Engineering Society of Korea. 2012; 16 (1):47-59.
Chicago/Turabian StyleJi-Hun Park; Seong-Ha Jeon; Kyung-Soo Kang. 2012. "Seismic Performance Evaluation of Masonry-Infilled Frame Structures using Equivalent Strut Models." Journal of the Earthquake Engineering Society of Korea 16, no. 1: 47-59.
Byoung-Wook Moon; Ji-Hun Park; Sung-Kyung Lee; Jinkoo Kim; Taejin Kim; Kyung-Won Min. Performance evaluation of a transmission tower by substructure test. Journal of Constructional Steel Research 2009, 65, 1 -11.
AMA StyleByoung-Wook Moon, Ji-Hun Park, Sung-Kyung Lee, Jinkoo Kim, Taejin Kim, Kyung-Won Min. Performance evaluation of a transmission tower by substructure test. Journal of Constructional Steel Research. 2009; 65 (1):1-11.
Chicago/Turabian StyleByoung-Wook Moon; Ji-Hun Park; Sung-Kyung Lee; Jinkoo Kim; Taejin Kim; Kyung-Won Min. 2009. "Performance evaluation of a transmission tower by substructure test." Journal of Constructional Steel Research 65, no. 1: 1-11.