Modelling of masonry infilled RC frames subjected to cyclic loads: State of the art review and modelling with OpenSees

Noh, Nurbaiah Mohammad; Liberatore, Laura; Mollaioli, Fabrizio; Tesfamariam, Solomon

doi:10.1016/j.engstruct.2017.07.002

Cited by 139 publications

(38 citation statements)

References 45 publications

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“…For the former, the average mechanical properties assigned to the infills are representative of those adopted in Italy, and some regions in southern Europe, in frames designed according to old seismic codes (Liberatore and Mollaioli 2015). On the other hand, the (average) mechanical properties of the infills used for the special-code frames are based on the study of Noh Mohammad et al (2017), which implemented the same properties in investigating the infill response of a highly reinforced and ductile experimental frames. It can be noticed here that the thickness of the infills in the SI frame is less than that in the PI frame.…”

Section: Layout Geometry and Materials Characteristicsmentioning

confidence: 99%

Effects of ground-motion sequences on fragility and vulnerability of case-study reinforced concrete frames

Aljawhari

Gentile

Freddi

et al. 2020

Bull Earthquake Eng

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This study investigates the effects of ground-motion sequences on fragility and vulnerability of reinforced concrete (RC) moment-resisting frames (MRFs). Two four-storey, four-bay RC MRFs are selected as case studies. These structures, which share the same geometry, are representative of distinct vulnerability classes in the Mediterranean region and are characterized by different material properties, cross-section dimensions, and detailing. The first case study is a ductile MRF designed according to Eurocode 8 (i.e., a special-code frame), while the second is a non-ductile MRF designed to sustain only gravity loads (i.e., a pre-code frame). The influence of masonry infills on their seismic performance is also investigated. Advanced numerical models are developed to perform cloud-based sequential nonlinear time history analyses using ground-motion sequences assembled by randomly pairing two real records via Latin hypercube sampling. Different structure-specific damage states are considered to derive fragility curves for the undamaged structures, when subjected to a single ground-motion record, and state-dependent fragility curves by considering the additional damage induced by a second ground-motion record within the sequence. Damage-to-loss models are then used to derive mean vulnerability relationships. Results of the analysis show the importance of considering the effect of damage accumulation in the pre-code frames. Moreover, the presence of infills shows an overall positive contribution to the seismic performance of both frame types. Vector-valued vulnerability relationships accounting for the damaging effect of two ground-motion records are finally presented in the form of mean vulnerability surfaces.

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Section: Layout Geometry and Materials Characteristicsmentioning

confidence: 99%

Effects of ground-motion sequences on fragility and vulnerability of case-study reinforced concrete frames

Aljawhari

Gentile

Freddi

et al. 2020

Bull Earthquake Eng

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“…The equivalent area of each strut is established based on the maximum lateral force of the infill, 38 transformed to the direction of the diagonal, and on the masonry compressive stress f m . The parameters obtained, ie, the maximum stress and strain, are used to define the masonry material with zero tensile strength simulated by the Concrete01 constitutive model 33,40 ( Figure 3B). 39 The lateral displacement of each infill is transformed into the diagonal displacement for the subsequent definition of the strain of the strut.…”

Section: Modelling Of the Infillsmentioning

confidence: 99%

“…39 The lateral displacement of each infill is transformed into the diagonal displacement for the subsequent definition of the strain of the strut. The parameters obtained, ie, the maximum stress and strain, are used to define the masonry material with zero tensile strength simulated by the Concrete01 constitutive model 33,40 ( Figure 3B). The stress f m is equal to 3.10 MPa, and all infills have a thickness of 0.15 m. Additionally, a residual stress equal to 10% of the maximum stress is considered for numerical stability, which is reached at an interstorey drift five times the interstorey drift at maximum strength.…”

Section: Modelling Of the Infillsmentioning

confidence: 99%

How is collapse risk of RC buildings affected by the angle of seismic incidence?

Skoulidou

Romão

Franchin

2019

Earthq Engng Struct Dyn

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Summary Despite the undeniable influence of the angle of seismic incidence on seismic demand, limited research has been performed to determine its effect when assessing the probabilistic seismic performance of a structure. Since the ground motion group size has a well‐known significant effect on the variability of collapse risk, the joint effect of both the ground motion group size and the angle of seismic incidence on the estimation of collapse risk is investigated. Results show that the two variables have a different effect on the collapse risk estimates, with one affecting the bias in the expected value of the estimates and the other their variability. In order to ensure acceptable levels of variability and bias, practical proposals are made regarding the minimum number of records and angles of seismic incidence that should be considered.

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“…Masonry infills have been modelled by idealized equivalent struts. The pinching factors for reloading strain and reloading stress and the degradation power of unloading stiffness have been defined according to [18]. The tensile response of the strut was assumed as 5% of the compressive response as the struts are meant to act in compression only.…”

Section: Non-linear Modellingmentioning

confidence: 99%

State-Dependent Vulnerability of Case-Study Reinforced Concrete Frames

Aljawhari¹,

Freddi²,

Galasso³

2019

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

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This study investigates the effect of mainshock-aftershock sequences on numerical fragility and vulnerability relationships of European reinforced concrete (RC) moment-resisting frames (MRFs). A four-story, four-bay nonductile RC MRF is selected for illustrative purposes. This index building is representative of a typical vulnerability class in the Mediterranean region. The influence of the masonry infills on seismic performance is also investigated. An advanced numerical nonlinear model is developed for the case-study frame and then assessed through nonlinear dynamic analysis using both real and artificial mainshock-aftershock sequences, via a 'sequential cloud' approach. The obtained seismic demand estimates allow to generate fragility functions for the undamaged frame when subjected to mainshocks only. Moreover, statedependent fragility functions are derived for the mainshock-damaged frame when subsequently subjected to aftershocks. Damage-to-loss models, specifically calibrated on Italian post-earthquake data, are used to derive vulnerability functions for this case-study structure. Preliminary results from the study show that the frame experiences severe damages states and high losses for a range of ground-motion shaking intensities, with a clear damage increase due to aftershocks. An attempt to generate vector-valued mainshock-aftershock vulnerability relationships is finally presented. The proposed vulnerability surfaces can be more easily implemented into a time-dependent risk assessment framework.

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Modelling of masonry infilled RC frames subjected to cyclic loads: State of the art review and modelling with OpenSees

Cited by 139 publications

References 45 publications

Effects of ground-motion sequences on fragility and vulnerability of case-study reinforced concrete frames

Effects of ground-motion sequences on fragility and vulnerability of case-study reinforced concrete frames

How is collapse risk of RC buildings affected by the angle of seismic incidence?

State-Dependent Vulnerability of Case-Study Reinforced Concrete Frames

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