• Title/Summary/Keyword: structural walls

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Cyclic load experiment study on the laminated composite RC walls with different concrete ages

  • Zhang, Hongmei;Lua, Xilin;Li, Jianbao;Liang, Lin
    • Structural Engineering and Mechanics
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    • v.36 no.6
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    • pp.745-758
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    • 2010
  • 12 typical laminated composite reinforced concrete (RC) walls with different concrete ages and 3 cast-in-place RC walls subjected to low frequency cyclic load were carried out in this study. The failure mode, force-deformation response and energy dissipation capacity of these specimens were investigated. Differences of structural behaviours between composite RC walls and common cast-in-place RC walls were emphasized in the analysis. The compatibility of the composite specimens with different concrete ages was discussed based on the experiment. Test results indicated that the differences between the lateral bearing capacity and the displacement ductility of the composite walls and the common walls were not so obvious. Some of the composite specimen even has higher bearing capacity under the experiment loading situation. Besides, the two parts of the laminated composite specimens demonstrates incompatibility at the later loading sequence on failure mode and strain response when it is in tension. Finally, this laminated composite shear walls are suggested to be applied in rapid reconstruction structures which is not very high.

Strength of Low Rise Structural Walls Using High Strength Concrete (고강도 콘크리트를 사용한 저층형 내력벽의 강도)

  • 윤현도;최창식;이리형
    • Proceedings of the Korea Concrete Institute Conference
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    • 1999.10a
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    • pp.407-410
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    • 1999
  • An experimental investigation to study the behavior of low rise structural walls using high strength concrete is presented. The test parameter included in the study were the level of constant axial load. The shear strength of walls is predicted by the design provision given in the current the American Concrete Institute Building Code ACI 318-95 and Architectural Institute Japan Code AIJ. The predictions are compared with the test results reported herein as well as those available in the literature.

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Effects of Web Reinforcement Amount on Hysteretic Behavior of High Strength Reinforced Concrete Structural Walls (전단보강근비에 따른 고강도 철근콘크리트 내력벽의 이력특성)

  • 최근도;정학영;윤현도;최장식;이리형
    • Proceedings of the Korea Concrete Institute Conference
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    • 1994.04a
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    • pp.85-90
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    • 1994
  • Three high strength reinforced concrete structural walls were tested under the combined action of a constant axial and a horizontal cycle load. The aim of the tests has been to investigate the effects of the web horizontal reinforcement on hysteretic behavior of wall. The results have helped to identify the causes of wall failure and have demonstrated the web horizontal reinforcement does not appear have a significant effect on shear capacity, stiffness and energy dissipation but have a significant effect on the failure mode of the walls.

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Structural impact response characteristics of an explosion-resistant profiled blast walls in arctic conditions

  • Sohn, Jung Min;Kim, Sang Jin;Seong, Dong Jin;Kim, Bong Ju;Ha, Yeon Chul;Seo, Jung Kwan;Paik, Jeom Kee
    • Structural Engineering and Mechanics
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    • v.51 no.5
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    • pp.755-771
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    • 2014
  • Environmental changes, especially global climate change, are creating new challenges to the development of the Arctic regions, which have substantial energy resources. And attention to offshore structures has increased with oil and gas development. The structural impact response of an explosion-resistant profiled blast walls normally changes when it operates in low temperatures. The main objectives of this study are to investigate the structural response of blast walls in low temperature and suggest useful guidelines for understanding the characteristics of the structural impact response of blast walls subjected to hydrocarbon explosions in Arctic conditions. The target temperatures were based on the average summer temperature ($-20^{\circ}C$), the average winter temperature ($-40^{\circ}C$) and the coldest temperature recorded (approximately $-68^{\circ}C$) in the Arctic. The nonlinear finite element analysis was performed to design an explosion-resistant profiled blast wall for use in Arctic conditions based on the behaviour of material properties at low temperatures established by performing a tensile test. The conclusions and implications of the findings are discussed.

Experimental studies on seismic behavior of steel coupling beams

  • Park, Wan-Shin;Yun, Hyun-Do;Chung, Jae-Yong;Kim, Yong-Chul
    • Structural Engineering and Mechanics
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    • v.20 no.6
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    • pp.695-712
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    • 2005
  • Hybrid coupled shear walls in tall buildings are known as efficient structural systems to provide lateral resistance to wind and seismic loads. Multiple hybrid coupled shear walls throughout a tall building should be joined to provide additional coupling action to resist overturning moments caused by the lateral loading. This can be done using a coupling beam which connects two shear walls. In this study, experimental studies on the hybrid coupled shear wall were carried out. The main test variables were the ratios of coupling beam strength to connection strength. Finally, this paper provides background for rational design guidelines that include a design model to behave efficiently hybrid coupled shear walls.

Seismic assessment and finite element modelling of glazed curtain walls

  • Caterino, Nicola;Zoppo, Marta Del;Maddaloni, Giuseppe;Bonati, Antonio;Cavanna, Giovanni;Occhiuzzi, Antonio
    • Structural Engineering and Mechanics
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    • v.61 no.1
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    • pp.77-90
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    • 2017
  • Glazed curtain walls are façade systems frequently chosen in modern architecture for mid and high-rise buildings. From recent earthquakes surveys it is observed the large occurrence of non-structural components failure, such as storefronts and curtain walls, which causes sensitive economic losses and represents an hazard for occupants and pedestrians safety. In the present study, the behavior of curtain wall stick systems under seismic actions has been investigated through experimental in-plane racking tests conducted at the laboratory of the Construction Technologies Institute (ITC) of the Italian National Research Council (CNR) on two full-scale aluminium/glass curtain wall test units. A finite element model has been calibrated according to experimental results in order to simulate the behavior of such components under seismic excitation. The numerical model investigates the influence of the interaction between glass panels and aluminium frame, the gasket friction and the stiffness degradation of aluminium-to-glass connections due to the high deformation level on the curtain walls behavior. This study aims to give a practical support to researchers and/or professionals who intend to numerically predict the lateral behavior of similar façade systems, so as to avoid or reduce the need of performing expensive experimental tests.

Investigation of Structural Damage in Bearing Wall Buildings with Pilotis by 2017 Pohang Earthquake (2017 포항지진에 의한 필로티형 내력벽건물의 구조손상 분석)

  • Eom, Tae Sung;Lee, Seung Jae;Park, Hong Gun
    • Journal of the Earthquake Engineering Society of Korea
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    • v.23 no.1
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    • pp.9-18
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    • 2019
  • In 2017 Pohang Earthquake, a number of residential buildings with pilotis at their first level were severely damaged. In this study, the results of an analytical investigation on the seismic performance and structural damage of two bearing wall buildings with pilotis are presented. The vibration mode and lateral force-resisting mechanism of the buildings with vertical and plan irregularity were investigated through elastic analysis. Then, based on the investigations, methods of nonlinear modeling for walls and columns at the piloti level were proposed. By performing nonlinear static and dynamic analyses, structural damages of the walls and columns at the piloti level under 2017 Pohang Earthquake were predicted. The results show that the area and arrangement of walls in the piloti level significantly affected the seismic safety of the buildings. Initially, the lateral resistance of the piloti story was dominated mainly by the walls resisting in-plane shear. After shear cracking and yielding of the walls, the columns showing double-curvature flexural behavior contributed significantly to the residual strength and ductility.

Prediction of shear strength and drift capacity of corroded reinforced concrete structural shear walls

  • Yang, Zhihong;Li, Bing
    • Structural Engineering and Mechanics
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    • v.83 no.2
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    • pp.245-257
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    • 2022
  • As the main lateral load resisting system in high-rise reinforced concrete structures, the mechanical performance of shear wall has a significant impact on the structure, especially for high-rise buildings. Steel corrosion has been recognized as an important factor affecting the mechanical performance and durability of the reinforced concrete structures. To investigate the effect on the seismic behaviour of corroded reinforced concrete shear wall induced by corrosion, analytical investigations and simulations were done to observe the effect of corrosion on the ultimate seismic capacity and drift capacity of shear walls. To ensure the accuracy of the simulation software, several validations were made using both non-corroded and corroded reinforced concrete shear walls based on some test results in previous literature. Thereafter, a parametric study, including 200 FE models, was done to study the influence of some critical parameters on corroded structural shear walls with boundary element. These parameters include corrosion levels, axial force ratio, aspect ratio, and concrete compressive strength. The results obtained would then be used to propose equations to predict the seismic resistance and drift capacity of shear walls with various corrosion levels.

Influence of openings of infill wall on seismic vulnerability of existing RC structures

  • Dilmac, Hakan
    • Structural Engineering and Mechanics
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    • v.75 no.2
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    • pp.211-227
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    • 2020
  • The contribution of infill wall is generally not considered in the structural analysis of reinforced concrete (RC) structures due to the lack of knowledge of the complex behavior of the infilled frame of RC structures. However, one of the significant factors affecting structural behavior and earthquake performance of RC structures is the infill wall. Considering structural and architectural features of RC structures, any infill wall may have openings with different amounts and aspect ratios. In the present study, the influence of infill walls with different opening rates on the structural behaviors and earthquake performance of existing RC structures were evaluated. Therefore, the change in the opening ratio in the infill wall has been investigated for monitoring the change in structural behavior and performance of the RC structures. The earthquake performance levels of existing RC structures with different structural properties were determined by detecting the damage levels of load-carrying components. The results of the analyzes indicate that the infill wall can completely change the distribution of column and beam damage level. It was observed that the openings in the walls had serious impact on the parameters affecting the behavior and earthquake performance of the RC structures. The infill walls have a beneficial effect on the earthquake performance of RC structures, provided they are placed regularly and there are appropriate openings rate throughout the RC structures and they do not cause structural irregularities.

Fragility Analysis of RC Moment Resisting Frame with Masonry Infill Walls (비내력벽을 가진 RC모멘트저항골조의 취약도 해석)

  • Ko, Hyun;Park, Yong-Koo;Lee, Dong-Guen
    • Journal of the Computational Structural Engineering Institute of Korea
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    • v.22 no.4
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    • pp.355-362
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    • 2009
  • Many of residential buildings, which have pilotis in lower stories to meet the architectural needs, are recently constructed in Korea. Usually, infill walls located in the upper stories of these buildings may cause a soft first story, which is very weak from the earthquake resistance. In the design of the buildings, the infill walls of upper stories are usually considered as non-structural elements and thus they are not included in the analytical model. However, the infill walls may affect the seismic behavior of the residential buildings. Therefore, the differences in seismic behaviors of RC buildings with and without masonry infill walls are required to be investigated. In this study, seismic fragility analyses were performed for masonry infilled low-rise RC moment-resisting frames. And seismic behaviors of RC moment-resisting frame with/without masonry infill walls were evaluated. Two types of structural system with the same frame and different allocation of infill walls are used to evaluate the influence of masonry infill walls on seismic behavior of RC moment-resisting frames. The infill walls were modeled as bi-equivalent diagonal struts. The fragility analyses show that the seismic performance of RC moment-resisting frames with soft story is below the desirable building seismic performance level recommended by current seismic codes, indicating high vulnerability of RC moment-resisting frames with soft story.