• Title, Summary, Keyword: Masonry-infilled wall

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Improvement and Evaluation of Seismic Resistant Performance of Reinforced Concrete Infilled Masonry Frame (철근콘크리트 프레임면내 조적벽체의 내진성능 평가 및 개선기술)

  • Shin, Jong-Hack;Ha, Gee-Joo;Jun, Ha-Suk;Lee, Jong-Chan
    • Journal of the Korea institute for structural maintenance and inspection
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    • v.4 no.1
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    • pp.147-155
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    • 2000
  • Five reinforced concrete rigid frame and masonry infilled wall and cut off type masonry infilled wall were tesed during vertical and cyclic loads simultaneously. Experimental programs were accomplished to improve and evaluate the structural performance of test specimens, such as the hysteretic behavior, the maximum horizontal strength, crack propagation, and ductility etc. Test variables are hoop reinforcement ratio, with or without masonry infilled wall, and masonry method. All the specimens were constructed in one-third scale size. Based on the test results, the following conclusions can be made. For masonry infilled wall(IFB-1), maximum horizontal capacity was increased by 1.45 time in comparision with that of rigid frame(FB-0). For cut off masonry infilled wall (IFBC-1~3), maximum horizontal capacity was increased by 1.73~1.98 time in comparision with that of rigid frame(FB-0). For cut off masonry infilled wall(IFBG-1~3), ductility was increased by 1.48~2.08 time in comparision with that of masonry infilled wall (IFB-1).

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Improvement and Evaluation of Seismic Resistant Performance of Reinforced Concrete Infilled Masonry Frame with Restraining Factor of Frame (철근콘크리트 프레임면내 조적벽체의 골조 구속에 따른 내진성능 평가 및 개선)

  • Shin, Jong-Hack;Ha, Gee-Joo;Lee, Hee-Jong
    • Journal of the Korea institute for structural maintenance and inspection
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    • v.5 no.3
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    • pp.131-139
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    • 2001
  • Experimental programs were accomplished to improve and evaluate the structural performance of RC frame structures with masonry infilled wall, such as the hysteretic behavior, the maximum horizontal strength, crack propagation, and ductility etc. Test variables are restraining factors of frame, with or without masonry infilled wall, and masonry method. Six reinforced concrete rigid frame and masonry infilled wall were tested and constructed in one-third scale size under vertical and cyclic loads simultaneously. Based on the test results, the following conclusions can be made. For masonry infilled wall with restraining factors of frame(IFWB-1~3), cumulated energy dissipation capacities were increased by 1.35~1.60 times in comparision with that of masonry infilled wall(IFB-1) at final stage of testing. For masonry infilled wall with restraining factors of frame, maximum horizontal capacities were increased by 1.91~2.24 times in comparision with that of rigid frame.

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Improvement and Evaluation of Structural performance of Reinforced Concrete Infilled Masonry Frame with Restraining Factor of Frame under Load Reversals (반복하중을 받는 철근콘크리트 프레임면내 조적벽체의 골조 구속에 따른 구조성능 평가 및 개선)

  • 신종학;하기주;김광연;이희종;남왕교
    • Proceedings of the Korea Concrete Institute Conference
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    • pp.541-546
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    • 2001
  • Experimental programs were accomplished to improve and evaluate the structural performance of test specimens, such as the hysteretic behavior, the maximum horizontal strength, crack propagation of and ductility etc. Test variables are restraining factors of frame, with or without masonry infilled wall, and masonry method Six reinforced concrete rigid frame and masonry infilled wall were tested and constructed in one-third scale size under vertical and cyclic loads simultaneously. Based on the test results, the following conclusions can be made. For masonry infilled wall with restraining factors of frame, maximum horizontal capacities were increased by 1.91~2.24 times in comparision with that of rigid frame. For masonry infilled wall with restraining factors of frame(IFWB-l~3), cumulated energy dissipation capacities wear increased by 1.35~l.60 times in comparision with that of masonry infilled wall(IFB-1) at final stage of testing.

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Development of Technique for Improvement of Earthquake-Resistant Performance of Reinforced Concrete Infilled Masonry Frame (철근콘크리트 프레임면내 조적벽체의 내진성능개선 기술 개발)

  • 신종학;하기주;최민권;권중배;남왕교
    • Proceedings of the Korea Concrete Institute Conference
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    • pp.1143-1148
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    • 2001
  • Experimental programs were accomplished to improve and evaluate the structural performance of test specimens, such as hysteretic behavior, maximum horizontal strength, crack propagation, and ductility etc. Test variables are restraining factors of frame, with or without masonry infilled wall, and masonry method. Six reinforced concrete rigid frame and masonry infiiled wall were constructed and tested in one-third scale size under vertical and cyclic loads simultaneously. Based on the test results, the following conclusions can be made. For masonry infilled walls with restraining factors of frame, maximum horizontal capacities were increased by 1.26~2.24 times in comparision with that of rigid frame. For masonry infilled wall with restraining factors of frame(IFWB-1), cumulated energy dissipation capacities wear increased by 1.60 times in comparision with that of masonry infilled wall(IFB-1) at final stage of testing.

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Evaluation and Improvement for Seismic Resistant Capacity of Reinforced Concrete Infilled Masonry Frame (철근콘크리트 프레임면내 조적벽체의 내진성능 평가 및 개선)

  • 신종학;하기주;최민권;전하석
    • Proceedings of the Korea Concrete Institute Conference
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    • pp.411-414
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    • 1999
  • Five reinforced concrete rigid frame and masonry infilled wall and cut off type masonry infilled wall were constructed and tesed during vertical and cycle loads simultaneously. Experimental programs were accomplished to evaluate the structural performance of test spcimens, such as the hysteretic behavior, the maximum horizontal strength, crack propagation, and ductility etc. Test variables are hoop reinforcement ratio and masonry infilled wall with on without. All the specimens were modelling in one-third scale size.

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Discontinuous deformation analysis for reinforced concrete frames infilled with masonry walls

  • Chiou, Yaw-Jeng;Tzeng, Jyh-Cherng;Hwang, Shuenn-Chang
    • Structural Engineering and Mechanics
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    • v.6 no.2
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    • pp.201-215
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    • 1998
  • The structural behavior of reinforced concrete frame infilled with a masonry wall is investigated by the method of discontinuous deformation analysis (DDA). An interface element is developed and it is incorporated into DDA to analyze the continuous and discontinuous behavior of the masonry structure. The numerical results are compared with previous research and possess satisfactory agreement. Then the structural behavior and stress distribution of a reinforced concrete frame infilled with a masonry wall subjected to a horizontal force are studied. In addition, the justification of equivalent strut is assessed by the distribution of principal stresses. The results show that the behavior of the masonry structure is highly influenced by the failure of mortar. On the basis of the distribution of principal stress of the masonry wall in the reinforced concrete frame, the equivalent strut can be approximately substituted for the masonry wall without separation and opening. However, the application of equivalent strut to the masonry wall with separation and opening needs further study.

A simplified method for estimating the fundamental period of masonry infilled reinforced concrete frames

  • Jiang, Rui;Jiang, Liqiang;Hu, Yi;Ye, Jihong;Zhou, Lingyu
    • Structural Engineering and Mechanics
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    • v.74 no.6
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    • pp.821-832
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    • 2020
  • The fundamental period is an important parameter for seismic design and seismic risk assessment of building structures. In this paper, a simplified theoretical method to predict the fundamental period of masonry infilled reinforced concrete (RC) frame is developed based on the basic theory of engineering mechanics. The different configurations of the RC frame as well as masonry walls were taken into account in the developed method. The fundamental period of the infilled structure is calculated according to the integration of the lateral stiffness of the RC frame and masonry walls along the height. A correction coefficient is considered to control the error for the period estimation, and it is determined according to the multiple linear regression analysis. The corrected formula is verified by shaking table tests on two masonry infilled RC frame models, and the errors between the estimated and test period are 2.3% and 23.2%. Finally, a probability-based method is proposed for the corrected formula, and it allows the structural engineers to select an appropriate fundamental period with a certain safety redundancy. The proposed method can be quickly and flexibly used for prediction, and it can be hand-calculated and easily understood. Thus it would be a good choice in determining the fundamental period of RC frames infilled with masonry wall structures in engineering practice instead of the existing methods.

Inelastic Behavior of Reinforced Concrete Frame Structure with Shear Strength of Masonry Wall (조적벽의 전단강도를 고려한 철근콘크리트골조의 비탄성 거동)

  • Yoon, Tae-Ho;Kang, Kyung-Soo
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.12 no.9
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    • pp.4216-4222
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    • 2011
  • In this study the inelastic behavior of the existing school buildings with infilled masonry walls is analysed by pushover method. The shear stiffness and strength of masonry wall is calculated from the prior experimets and verified by inelastic analysis. The height of infilled masonry wall affects the structural behavior. The higher the masonry wall height, the higher the initial shear stiffness and strength of masonry wall. As the cracks are developed, the strength of masonry wall is much decreased. The proposed inelastic analysis method shows similar results with the experiments and can be used as inelastic analysis model of reinforced concrete buildings with infilled masonry walls.

Seismic Performance Evaluation of Masonry Infilled Wall With Non-seismic Detail (비내진 상세를 가진 조적채움벽의 내진성능평가)

  • Park, Byung Tae;Kwon, Ki Hyuk
    • Journal of the Korean Society of Safety
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    • v.32 no.1
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    • pp.66-74
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    • 2017
  • Masonry walls which are commonly used for partitions in low-rise reinforced concrete (RC) structures, can be easily exposed to high risks under strong earthquakes. Since the strength degradations cannot be protected under the ground motions, their applications cannot be recommended for building structures which are designed to possess high seismic performances. However, masonry-infilled walls are typically considered as non-structural elements in evaluating the seismic performance of building structures. In order to figure out this problem, this study performed experiments using two specimens-only RC frame and RC frame infilled with masonry walls- under static loading. Also, the study established analytical models representing fully infilled frames and bare frame, and compared their structural behavior with test results. In addition, analytical model representing partially infilled frames was established and analyzed. Test results indicated that strength and energy dissipating capacity were increased for IW-RN(fully infilled frames) compared to the NW(bare frame). The nonlinear static analysis of the three specimens was also conducted using the inelastic plastic hinge frame element and diagonal strut models, and the analytical results successfully simulated the nonlinear behaviour of the specimens in accordance with the test results.

Finite Element Analysis of Reinforced Concrete Masonry Infilled Frames with Different Masonry Wall Thickness Subjected to In-plane Loading (채움벽 두께에 따른 철근콘크리트 조적채움벽 골조의 면내하중에 대한 유한요소해석)

  • Kim, Chungman;Yu, Eunjong;Kim, Minjae
    • Journal of the Computational Structural Engineering Institute of Korea
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    • v.29 no.1
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    • pp.85-93
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    • 2016
  • In this study, finite element analyses of masonry infilled frames using a general purpose FE program, ABAQUS, were conducted. Analysis models consisted of the bare frame, infilled frames with masonry wall thickness of 0.5B and 1.0B, respectively. The masonry walls were constructed using the concrete bricks which were generally used in Korea as infilled wall. The material properties of frames and masonry for the analysis were obtained from material tests. However, four times increased the tensile strength was used for 1.0B wall, which is seemingly due to the differences in locating the bricks. The force-displacement relation and development of crack from the FE analysis were very similar to those from the experiments. From the FEA results, contact force between the frame and masonry, distribution of shear force and bending moments in frame members were analyzed. Obtained contact stress shows a trianglur distribution, and the contact length for 0.5B speciment and 1.0B specimen were close to the value estimated using ASCE 41-06 equation and ASCE 41-13 equation, respectively. Obtained shear force and bending moment distribution seems to replicate actual behavior which originates from the contact stress and gap between the frame and masonry.