Designing infilled reinforced concrete frames with the ‘strong frame-weak infill’ principle

Huang, Qunxian; Guo, Zi‐Xiong; Kuang, Jingming

doi:10.1016/j.engstruct.2016.05.024

Cited by 46 publications

(15 citation statements)

References 24 publications

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“…Furthermore, Young's modulus of masonry is 190 times the compressive strength. The value of this ratio was equal to 136, 216, 251, 463, and 702 in tests performed by Kalali and Kabir, [44] Kalali and Kabir, [46] Kakaletsis and Karayannis, [26] Huang et al, [47] and Tasnimi and Mohebkhah, [29] respectively, which shows a wide range of this ratio.…”

Section: As Shown Inmentioning

confidence: 98%

Analytical estimation of lateral resistance of low‐shear strength masonry infilled reinforced concrete frames with openings

Mansouri

Marefat

Khanmohammadi

2017

Structural Design Tall Build

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Summary Presence of openings in an infill wall alters its behavior and reduces load resistance and stiffness of the infilled frame. In this paper, a simple method for estimating the lateral resistance of infilled frames with openings is proposed based on experimental data. Six half‐scale, single‐story single‐bay reinforced concrete frame specimens were tested under in‐plane lateral loading. The lateral strength of reinforced concrete (RC) frame could be estimated by assuming the formation of plastic hinges in the end regions of the members. In the specimens with central openings, the major load resistance mechanism of the infill panel was the formation of a compression strut and lateral strength of infill panel could be considered as the smallest values of the diagonal tension and corner crushing modes. In the specimens with eccentric openings, the load resistance mechanism of masonry infill was the formation of a compression strut and bed‐joint sliding in 2 opposite loading directions; thus, the lateral resistance of infill panel could be estimated in diagonal tension and corner crushing modes in one direction and bed‐joint sliding mode in another direction. Furthermore, the deformation capacity and structural performance levels are suggested for solid and perforated infill panels based on test observations.

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Section: As Shown Inmentioning

confidence: 98%

Analytical estimation of lateral resistance of low‐shear strength masonry infilled reinforced concrete frames with openings

Mansouri

Marefat

Khanmohammadi

2017

Structural Design Tall Build

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“…However, as demonstrated by many researchers [1][2][3][4][5], infill panels may completely alter the structural behaviour by their non-negligible bracing actions during strong earthquake excitation. The cost-effective, easy construction and flexible layout characteristics of masonry infill panels make them a popular choice for architects to arrange interior and exterior partitions.…”

Section: Introductionmentioning

confidence: 99%

“…Most of the seismic codes of practice nowadays tend to designate masonry infill panels as non-structural elements and neglect their structural participation during earthquake excitation. However, as demonstrated by many researchers [1][2][3][4][5], infill panels may completely alter the structural behaviour by their non-negligible bracing actions during strong earthquake excitation. The severe interaction between infill walls and bounding frame can be detrimental to the seismic performance of buildings, resulting in irreparable damage or even collapse of the whole structure, tremendously endangering people's lives and properties.…”

Section: Introductionmentioning

confidence: 99%

Low‐seismic damage strategies for infilled RC frames: shake‐table tests

Zhang

Kuang

Yuen

2017

Earthq Engng Struct Dyn

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Summary Unreinforced masonry (URM) infill panels are widely used as partitions in RC frames and typically considered as non‐structural elements in the design process. However, observations from recent major earthquakes have shown that under seismic excitation, the structural interaction between columns and infill walls can significantly alter the structural behaviour, thus causing catastrophic consequences. The purpose of this research was to propose and test an innovative low seismic damage detailing method, which isolates the infill panel from bounding columns with finite width vertical gaps during the infill panel construction phase and deploys steel wire connections in mortar layers anchored to columns. Taking into account the similitude requirements, a total of six one‐third scale, single‐storey single‐bay RC frames with different infill configurations and flexible connection details were carefully designed and tested on a shake‐table. Three real earthquake records were selected and scaled to ascending intensity levels and used as input signals. A series of thorough investigations including dynamic characteristics, hysteretic behaviour, failure mechanisms, out‐of‐plane vulnerabilities and the effect of different gap filling materials and load transfer mechanisms were rigorously studied. The experimental results indicate that the undesirable interaction between infill panels and bounding frame is significantly reduced using the proposed low seismic damage detailing concept. Direct shear failure of columns at an early stage is prevented, and structural redundancy at high levels of excitation can be provided. In general, the structural stability and integrity, and displacement ductility of infilled RC frames can remarkably be improved. Copyright © 2017 John Wiley & Sons, Ltd.

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“…If the strength of the infill wall is relatively high, then the lateral constraint on the column is strong and the free segment of the column decreases, causing short column effect. Hence, the shear bearing capacity ratio of the frame column to the infill wall is an important parameter that affects the failure mode of the column [15]. This ratio can be expressed by the following equation:…”

Section: Shear Bearing Capacity Ratio Of the Frame Column To The Infimentioning

confidence: 99%

“…Thus, the column is kept captive by the infill wall, and only a segment can deform laterally; this structure will be prone to short column effect, which is harmful to seismic performance [13,14]. Then the "strong frame-weak infill" criterion which can form a two-line system of defense and prohibit the brittle shear failure in columns was proposed by Huang [15] for the seismic design of infilled frame structures. Other literature review shows that using isolator subframes or flexible connection between the wall and frame can reduce the wall-frame interaction and improve the seismic performance [16][17][18][19][20][21][22].…”

Section: Introductionmentioning

confidence: 99%

Influence of Infill Wall Configuration on Failure Modes of RC Frames

Zhou

Kou

Peng

et al. 2018

Shock and Vibration

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An improper configuration of masonry infill walls in RC frame may lead to short column effect on the columns, which is harmful to the seismic behavior of the structure. In this study, a bare frame and two single-story, single-bay RC frames, partially infilled with masonry, were tested under cyclic loading. The failure mechanism and seismic performance of these partially infilled RC frames (with an infill height of 600 mm) with different types of connections were analysed. Based on the experiment, nonlinear finite element simulation and analysis were conducted to study the effects of the infill walls and connections. The results show that both mechanical performance and failure mode are affected by the infill height, the type of connection between the frame and the infill, and the ratio of shear bearing capacity of the frame column to that of the infill. For the masonry-infilled frame with rigid connection, the higher the infill wall is, the lower the shear bearing capacity ratio will be. Thus, the effect of the lateral constraint of the infill wall on the column increases, and the shear span ratio of the free segment of the column decreases, resulting in the short column effect. Based on the analysis results, a value of 2.0 is suggested for the critical shear bearing capacity ratio of the frame column to the infill wall. If the shear bearing capacity ratio is less than 2.0 and the shear span ratio of the column free segment is not more than 2.0, the short column effect will occur. For the infilled frame with flexible connection, both the lateral constraint from the wall to the column and the wall-frame interaction decrease; this reduces or prevents the short column effect. The conclusion can present guidance for the design and construction of masonry-infilled RC frame structure.

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Designing infilled reinforced concrete frames with the ‘strong frame-weak infill’ principle

Cited by 46 publications

References 24 publications

Analytical estimation of lateral resistance of low‐shear strength masonry infilled reinforced concrete frames with openings

Analytical estimation of lateral resistance of low‐shear strength masonry infilled reinforced concrete frames with openings

Low‐seismic damage strategies for infilled RC frames: shake‐table tests

Influence of Infill Wall Configuration on Failure Modes of RC Frames

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