Infill Walls with Sliding Joints to Limit Infill-Frame Seismic Interaction: Large-Scale Experimental Test

Preti, Marco; Bettini, N.; Plizzari, Giovanni

doi:10.1080/13632469.2011.579815

Cited by 104 publications

(65 citation statements)

References 20 publications

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“…The experimental results in Preti et al (2012) showed that the vertical confinement provided by the top beam of the frame (4, Fig. 1) results in a progressive increase in friction force along the sliding joints (2) for increasing in-plane deformation imposed on the system.…”

Section: Construction Techniquementioning

confidence: 99%

“…The results obtained by Preti et al (2012) showed the potential of horizontal partition joints (embedded in few masonry mortar beds and acting as sliding joints) to ensure a ductile mechanism for the infill under in-plane loading, preventing the development of the typical diagonal strut mechanism (Paulay and Priestley 1992). This paper presents the new results of that experimental program and also addresses the issue of out-of-plane response for such infill walls with sliding joints, starting with the results collected in previous experience.…”

Section: Introductionmentioning

confidence: 98%

“…The hinges were designed and arranged to reproduce typical structural frame deformation at the ultimate limit state, when the collapse mechanism is fully activated (Preti et al 2012). For efficiency reasons, the four experimental hinges were placed at the end of the columns.…”

Section: Test Set-upmentioning

confidence: 99%

“…The seismic vulnerability of frame-reinforced concrete (RC) structures due to infill frame interaction has been observed repeatedly (EERI 1996(EERI , 2000Hermanns et al 2013) and is well acknowledged in the literature (Paulay and Priestley 1992;Fardis et al 1999;Dolšek and Fajfar 2008). Typically, infill walls have so far been proportioned and verified as nonstructural elements of the building and their role in the structural response has often been underestimated or completely neglected in design practice.…”

Section: Introductionmentioning

confidence: 99%

“…Typically, infill walls have so far been proportioned and verified as nonstructural elements of the building and their role in the structural response has often been underestimated or completely neglected in design practice. Several research programs have recently addressed the need for a design of masonry infill walls with appropriate detailing to enhance their seismic behaviour (Calvi and Bolognini 2001;Mohammadi and Akrami 2010;Preti et al 2012;Markulak et al 2013;Facconi et al 2014). Two different research approaches can be identified, one aiming to strengthen the infill, in order to make it a structural element able to support seismic load, the other to limit the infill frame interaction by reducing the infill strength and stiffness.…”

Section: Introductionmentioning

confidence: 99%

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Experimental testing of engineered masonry infill walls for post-earthquake structural damage control

Preti

Migliorati

Giuriani

2014

Bull Earthquake Eng

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The paper presents the results of an experimental campaign on the behaviour of engineered masonry infill walls subjected to both in-and out-of-plane loading. The aim of the research was to develop a design approach for masonry infill walls capable of solving their vulnerability and detrimental interaction with the frame structure when exposed to seismic excitation. Tests on two large-scale specimens and sub-assemblies were performed in order to evaluate the infill deformation capacity, the damage associated with different drift levels, and the mechanical properties of the components. A design solution with sliding joints to reduce the infill-frame interaction and ensure out-of-plane stability, which was proposed in a previous study, was developed and refined with focus on construction details. The aim of sliding joints is to ensure a predetermined mechanism in the infill wall, which is governed by hierarchy of strength and is capable of ensuring ductility and energy dissipation that can be taken into account in the design practice, thanks to the predictability of the response. The two infill wall specimens, one of them including an opening, reached up to 3 % in-plane drift with very little damage and supported an out-of-plane force equivalent to a horizontal acceleration four times the acceleration of gravity. The force-displacement hysteretic curve, sliding at the joints and crack pattern show the efficiency of the construction technique, based on affordable and tradition-like construction processes and materials. The technique, presented here for hollow fired-clay masonry units, can be extended to different masonry infill typologies.

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Section: Construction Techniquementioning

confidence: 99%

Section: Introductionmentioning

confidence: 98%

Section: Test Set-upmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Experimental testing of engineered masonry infill walls for post-earthquake structural damage control

Preti

Migliorati

Giuriani

2014

Bull Earthquake Eng

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DEGAS: An innovative earthquake‐proof AAC wall system

et al. 2018

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Background:The in-plane response of infill walls independent of the material used has been investigated thoroughly in the literature and the common observation on the response was the formation of both compression struts and tension struts. These struts in the diagonals of the infill walls are the main reason for the cracking and crushing of the infill wall material. Researchers have proposed some techniques that enhance the performance of infill walls. Most of the proposed methods include a special device or connection detailing to isolate the infill wall from the RC frame even during excessive lateral displacement demands. Aim:The objectives of the current study are: to devise and test a seismic isolation system for AAC infill walls that is capable of eliminating the damage due to in-plane demands while being stable under out-of-plane demands. The outcomes of this study are believed to provide a sound alternative for constructing earthquake safe AAC infill walls. Materials & Methods:In this study, a new method is devised to protect and enhance the performance of AAC infill walls, i.e. DEGAS. The DEGAS system is thought to increase both the ductility of the AAC infill walls in in-plane demands and to stabilize the AAC infill wall during out-of-plane demands. To this end, an experimental program was formed to investigate the IP and OOP interaction for AAC infill walls with the application of the DEGAS system. In the scope of this study, three different tests were conducted to simulate i-IP only, ii-OOP only and IP + OOP cases.Two-way cyclic displacement excursions were applied to the test specimens to mimic the in-plane demands. Furthermore, uniform pressure was applied to simulate the OOP related demands. The OOP demands are considered by applying OOP pressure.Results: Some crushing was observed during the testing of the Specimen S1. However, no visible cracks were detected in the AAC infill wall. This observation could be attributed to the application of DEGAS system along with the presence of the gap between the AAC infill wall and the RC frame.The maximum out-of-plane load of the Specimen S2 was determined to be about 20 kN. No sudden collapse-type failure was observed in this test. This showed the importance of the application of the DEAGS system. Because, the out-of-plane failure of the AAC infill walls are generally total or partial sudden collapse of the wall. The Specimen S3 had a drift capacity of 2.5%. At this drift limit, the capacity reduction was determined to be only 8%. In addition, no sudden out-of-plane collapse of the infill wall was observed during the testing of Specimen S3. Discussions & Conclusions:In this study, three half-scaled tests were conducted on AAC infilled frames with the DEGAS system. The DEGAS system was shown to increase the stability of the AAC infill walls as none of the specimens was observed to fail by total or partial collapse of the AAC infill wall. In addition, the cracking of the AAC infill walls were also limited at drift ratios of ce papers. 2018;2:247-252. wileyonli...

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Seismic performance of AAC masonry infill: From traditional systems to innovative solutions

et al. 2018

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According to many post-seismic event surveys and research investigations, the seismic response of masonry infills can cause considerable economic and downtime losses and can represent a serious threat to human lives. Although many researchers have developed innovative infill systems and new design criteria, a widely scientifically and practical recognized solution which can be adopted for every masonry type has not been achieved yet. Moreover, the increased use of autoclaved aerated concrete (AAC) masonry infills thanks to its lightness, excellent thermal and acoustic insulation, and the fire resistance highlights the need of enhancing the knowledge about the seismic behavior of such infill material, and the possibility to develop improved systems that optimize the response of the AAC masonry in order to reduce detrimental issues of traditional infills. Within this paper, the experimental cyclic (in-plane and out-of-plane) response of some traditional and enhanced infill solutions are presented together with a numerical simulation of the in-plane tests on AAC unreinforced masonry infills. Furthermore, the main aspects affecting the seismic response, such as the in-plane performance, the out-of-plane resistance, the local effects on adjacent reinforced concrete (RC) members, are discussed in order to indicate a possible path for future seismic resistant innovative solutions for AAC masonry infills. K E Y W O R D SAAC masonry infill, in-plane and out-of-plane response, infill seismic behavior, improved infill solutions, seismic issues of infills

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Infill Walls with Sliding Joints to Limit Infill-Frame Seismic Interaction: Large-Scale Experimental Test

Cited by 104 publications

References 20 publications

Experimental testing of engineered masonry infill walls for post-earthquake structural damage control

Experimental testing of engineered masonry infill walls for post-earthquake structural damage control

DEGAS: An innovative earthquake‐proof AAC wall system

Seismic performance of AAC masonry infill: From traditional systems to innovative solutions

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