Seismic performance of URM buildings with in-plane non-stiffened and stiffened timber floors

Scotta, Roberto; Trutalli, Davide; Marchi, Luca De; Pozza, Luca

doi:10.1016/j.engstruct.2018.02.060

Cited by 28 publications

(16 citation statements)

References 25 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The solution is shown in Figure 8 and aims at reinforcing the IP and OOP connections between the wood diaphragms and the URM bearing walls and increase the flexural capacity of the diaphragms reinforcing the chord element through the use of a continuum steel angle along the edges of the timber diaphragm connected to the masonry using anchor bolts or alternate injection anchorages in order to preserve the original figure of the external façade. (6,20).…”

Section: Figure 7 Strengthening Solution Proposed For Pombalino Buildings (9)mentioning

confidence: 99%

A review on wall-to-timber floor anchorages in URM buildings

Solarino

Oliveira

Giresini

2019

IABSE Symposium, Guimarães 2019: Towards a Resilient Built Environment Risk and Asset Management

View full text Add to dashboard Cite

<p>Out of plane failure of unreinforced masonry walls is considered one of the most vulnerable seismic hazards in medium and high earthquake-prone regions. Efficient structural connections enable global equilibrated mechanisms, ensuring the “box-behavior”. Timber floors are widely used as horizontal diaphragm in historical constructions, and their connection to the boundary walls is crucial to facilitate internal force redistribution and to restrain out of plane walls. Wall-to-floor anchorages are typical in existing historical buildings, and innovative solutions are proposed nowadays by engineers as strengthening devices. Unfortunately, they are often too invasive or unsustainable solutions, applied without reliable seismic design and evaluation through valid models.</p><p>This paper presents a literature review on the traditional and innovative wall-to-timber floor anchors used in unreinforced masonry buildings taking into account experimental works, analytical and numerical studies.</p>

show abstract

Section: Figure 7 Strengthening Solution Proposed For Pombalino Buildings (9)mentioning

confidence: 99%

A review on wall-to-timber floor anchorages in URM buildings

Solarino

Oliveira

Giresini

2019

IABSE Symposium, Guimarães 2019: Towards a Resilient Built Environment Risk and Asset Management

View full text Add to dashboard Cite

show abstract

“…The influence of the mechanical properties of floors on the global seismic behaviour of masonry buildings has been addressed in different studies using linear dynamic numerical analysis (Tena-Colunga and Abrams 1996), push-over analysis (Giongo et al 2012;Gattesco and Macorini 2014;Ortega et al 2018;Jiménez-Pacheco et al 2020) and non-linear dynamic analysis (Betti et al 2014;Gubana andMelotto 2017, 2019a;Nakamura et al 2017;Scotta et al 2018;Trutalli et al 2019). Moreover, previous investigations have evaluated the possibility of designing and calibrating the in-plane properties of the floor to cap the shear forces transferred to shear-resistant walls (Preti et al 2017;Longarini et al 2019).…”

Section: Introductionmentioning

confidence: 99%

Evaluation of timber floor in-plane retrofitting interventions on the seismic response of masonry structures by DEM analysis: a case study

Gubana

Melotto

2021

Bull Earthquake Eng

View full text Add to dashboard Cite

The seismic response of existing masonry structures is strongly influenced by floor and roof in-plane properties. A strengthening intervention is often needed for traditional timber floors to overcome their low in-plane stiffness and to preserve historical buildings. In this study, the effects of unreinforced and reinforced timber floors on the seismic behaviour of an existing listed masonry building are investigated with dynamic non-linear analyses by means of the Discrete Element Method (DEM). With this approach, the failure processes and collapse sequences of masonry structures can be captured in detail. A previously developed model of the floor cyclic behaviour, based on experimental data, is applied herein to DEM models of the masonry building. Different seismic ground accelerations, different floor types and different floor-to-wall connections are considered. The results highlight the effectiveness of the analysed floor strengthening solution in reducing the out-of-plane displacements of masonry walls. With adequate connections, the reinforced floor is able to transfer the seismic forces to the shear-resistant walls up to the shear-sliding collapse of the structural sidewalls. A comparison with the ideal rigid diaphragm case confirms the good performance of the strengthened floors. The small observed out-of-plane displacements are compatible with the masonry wall capacity, and the reinforced floor hysteretic cycles contribute to dissipate part of the input energy. Moreover, different designs of the connections can also cap the transferred seismic forces to an acceptable level for shear-resistant walls.

show abstract

“…Past seismic events showed that the seismic vulnerability of unreinforced masonry structures is high due to its low tensile strength, low ductility, and low energy dissipation capacity, particularly in the case of existing buildings lacking "box-type" behavior [7][8][9][10]. The lack of seismic design rules for URM buildings, which have been often designed mostly for vertical loads, also contributes to the high seismic vulnerability.…”

Section: Introductionmentioning

confidence: 99%

Pushover analysis of unreinforced irregular masonry buildings: Lessons from different modeling approaches

Aşıkoğlu

Vasconcelos

Lourénço

et al. 2020

Engineering Structures

View full text Add to dashboard Cite

The present paper addresses the seismic performance of a half-scale two-story unreinforced masonry (URM) building with structural irregularity in plan and in elevation. The main objectives are (i) to understand the seismic response of URM buildings with torsional effects, and (ii) to evaluate the reliability of using simplified approaches for irregular masonry buildings. For this purpose, nonlinear static analyses are carried out by using three different modeling approaches, based on a continuum model, beam-based and spring-based macro-element models. The performance of each approach was compared based on capacity curves and global damage patterns. Reasonable agreement was found between numerical predictions and experimental observations. Validation of simplified approaches was generally provided with reference to regular structures but, based on the differences in the base shear capacity found here, it appears that structural irregularities are important to be taken into account for acquiring higher accuracy on simplified methods when torsion is present.

show abstract

Seismic performance of URM buildings with in-plane non-stiffened and stiffened timber floors

Cited by 28 publications

References 25 publications

A review on wall-to-timber floor anchorages in URM buildings

A review on wall-to-timber floor anchorages in URM buildings

Evaluation of timber floor in-plane retrofitting interventions on the seismic response of masonry structures by DEM analysis: a case study

Pushover analysis of unreinforced irregular masonry buildings: Lessons from different modeling approaches

Contact Info

Product

Resources

About