Seismic fragility of lightly reinforced concrete frames with masonry infills

Jeon, Jong‐Su; Park, Ji Hun; DesRoches, Reginald

doi:10.1002/eqe.2555

Cited by 66 publications

(43 citation statements)

References 40 publications

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“…About research studies from literature, the issue of shear failure modelling in non-ductile RC frames due to local interaction with infill elements has been investigated with different approaches (Figure 1) during the last years (e.g., [16]- [19], among others). Multiple-strut approaches are generally suggested in these studies, generally proposing to model the infill by a minimum of one-strut -eccentrically placed respect to the infill diagonal, like suggested in the ASCE-SEI/41 [13] -to a maximum of two (Figure 1b,d) or three struts (Figure 1c,e,f), basically different for the position of the loading points on the adjacent columns, the ratio of the total infill lateral load adsorbed by each strut, and for the struts inclination.…”

Section: Columns-infill Shear Interaction Modelling From Codes and LImentioning

confidence: 99%

Numerical Modelling of Infilled Rc Frames: The Detection of Column Failure Due to Local Shear Interaction

Risi¹,

Gaudio²,

Ricci³

et al. 2019

Proceedings of the 7th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering (COM

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Numerical and experimental studies highlighted that the presence of masonry infills in Reinforced Concrete (RC) frames certainly leads to the increase in their lateral strength and stiffness. Nevertheless, post-earthquake observed damage showed that infills can also cause potential brittle failures due to the local interaction with structural elements, thus producing a limitation of deformation capacity of the surrounding frame. This detrimental effect is particularly important for existing masonry-infilled RC buildings designed for gravity loads only without any capacity design requirements. A proper numerical model both for infills and RC members is necessary to reliably detect the shear failure on columns due to the local interaction with the masonry infill. In the last years, several researches dealt with this topic, ranging from very simple models such as the equivalent strut model to more complex models like the double-and triple-strut models or FEMapproaches. Nevertheless, the choice of the proper modelling strategies and degrading shear strength model is still a frontier issue for the most recent research works, especially when the shear failure occurs in the degrading phase of the infilled frame response. This paper presents a preliminary numerical investigation on column shear failure due to local interaction between structural and non-structural elements, starting from the results of two experimental tests on infilled frames performed by the Authors. Different shear strength models and different strategies of macro-modelling for infills are applied and discussed, in order to (i) to match the experimental response in terms of initial stiffness, peak strength and corresponding displacement, and softening behaviour and (ii) to capture (or not) the column shear failure exhibited (or not) during the test. The best modelling strategy is finally identified to provide a support towards future necessary numerical investigations.

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Section: Columns-infill Shear Interaction Modelling From Codes and LImentioning

confidence: 99%

Numerical Modelling of Infilled Rc Frames: The Detection of Column Failure Due to Local Shear Interaction

Risi¹,

Gaudio²,

Ricci³

et al. 2019

Proceedings of the 7th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering (COM

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“…Although the Hysteretic Material in OpenSees can be defined as a tension‐compression asymmetric uniaxial trilinear hysteretic material by adjusting the user option of pinchx and pinchy , the material cannot capture the compression‐only behavior of the equivalent struts when the lateral loading is suddenly reversed. The problem of this material is ignored in the present analyses . Therefore, the Hysteretic Material and Elastic‐No Tension Material are combined by the Series Material definition in the OpenSees program to model the infill strut behavior.…”

Section: Modeling and Analysis Of Infilled Sc‐mrfmentioning

confidence: 99%

“…The problem of this material is ignored in the present analyses. [42,43] Therefore, the Hysteretic Material and Elastic-No Tension Material are combined by the Series Material definition in the OpenSees program to model the infill strut behavior.…”

Section: The Modeling Of Infillsmentioning

confidence: 99%

Influence of infill configurations on seismic responses of steel self‐centering moment resisting frames

Huang

Zhou

Hua

et al. 2018

Structural Design Tall Build

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Summary Steel self‐centering moment resisting frames (SC‐MRFs) have been validated experimentally as resilient structural systems, mainly highlighting the minimized residual drift responses but are prone to suffering high‐mode effects. In this paper, the influence of infill configurations on seismic responses of steel SC‐MRFs was first analyzed. A comparison of the previous experimental results was conducted to investigate the effect of infills on the residual drift of steel frames. In the numerical simulation, the infills were modeled as the equivalent strut diagonals, and the force–displacement of the infills was modeled using the combination of Elastic‐No Tension Material and Hysteretic Material offered by the OpenSees program. The seismic analyses of 3‐ and 9‐story SC‐MRFs with and without infills were carried out to analyze the effects of infills on the residual drift responses and high‐mode contribution under the selected ground motions. Finally, the different infill types and infill irregularities on the seismic responses were investigated to obtain general conclusions. The plastic deformations of columns and infills are also compared in the different cases of infill configurations. The results reveal that all infilled cases experience reduced peak‐story drift and force demands at the upper stories.

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“…In that respect, several probabilistic seismic demand models have been proposed (e.g., [2][3][4][5][6][7][8]). Although these models predict reasonably well the peak story drift ratios (SDRs) along the height of a building, they typically do not predict other EDPs [e.g., residual drifts, peak absolute floor accelerations (PFAs)] that are deemed to be critical in earthquake-induced loss assessment [9,10].…”

Section: Introductionmentioning

confidence: 99%

Proposed Methodology for Earthquake-Induced Loss Assessment of Instrumented Steel Frame Buildings: Building-Specific and City-Scale Approaches

Hwang¹,

Lignos²

2017

Proceedings of the 6th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering (COM

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Seismic fragility of lightly reinforced concrete frames with masonry infills

Cited by 66 publications

References 40 publications

Numerical Modelling of Infilled Rc Frames: The Detection of Column Failure Due to Local Shear Interaction

Numerical Modelling of Infilled Rc Frames: The Detection of Column Failure Due to Local Shear Interaction

Influence of infill configurations on seismic responses of steel self‐centering moment resisting frames

Proposed Methodology for Earthquake-Induced Loss Assessment of Instrumented Steel Frame Buildings: Building-Specific and City-Scale Approaches

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