Ductile Behavior of Timber Structures under Strong Dynamic Loads

Porcu, Maria Cristina

doi:10.5772/65894

Cited by 10 publications

(6 citation statements)

References 42 publications

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“…Therefore, it could be improper distinguishing the stiffness boost from that of reduced stiffness after the first loading cycle, as stated by Porcu (2017). The so-called slip-lock effect (Baber & Noori, 1985) features pinching in timber components but not in RC ones (Favvata & Karayannis, 2014).…”

Section: Definition Of Pinchingmentioning

confidence: 99%

Effect of pinching on structural resilience: performance of reinforced concrete and timber structures under repeated cycles

Aloisio

Pelliciari

Bergami

et al. 2022

Structure and Infrastructure Engineering

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This article attempts to define pinching of two structural joints, reinforced concrete (RC) and wood ones. In particular, the research outlines differences and analogies between pinching of an RC portal and a Light Timber Frame (LTF) wall. This is done by focusing on the concavity of pinching in their response under repeated cycles, which produces differences in the energy dissipation. The response of the two structural archetypes under pseudo-static and dynamic simulations is analysed using the Atan hysteresis model modification. The truncated incremental dynamic analysis (TIDA) of the two systems modelled as single-degree-of-freedom (SDOF) oscillators yielded the fragility curves, approximated by a lognormal cumulative distribution (CDF). The stability of RC under repeated cycles reveals its significant resilience compared to LTF structures. The examination of the fragility functions supports a discussion about the relation between the pinching concavity and the notion of structural resilience by introducing a robustness index ranging from 0 to 1. Ultimately, a parametric analysis of a fictitious structural system derived from the timber one by varying the concavity of the pinching path leads to the estimation of the robustness index as a function of the pinching concavity.

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Section: Definition Of Pinchingmentioning

confidence: 99%

Effect of pinching on structural resilience: performance of reinforced concrete and timber structures under repeated cycles

Aloisio

Pelliciari

Bergami

et al. 2022

Structure and Infrastructure Engineering

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“…The ductility of components usually have been evaluated by the ductility factor (μ). The ductility factor was calculated as the ratio between the maximum deformation umax and the yield deformation uy (Porcu 2017). The ductility factor (μ) of the column base was calculated with Eq.…”

Section: Ductilitymentioning

confidence: 99%

Effect of column foot tenon on behavior of larch column base joints based on concrete plinth

Han

Dai

Qian

et al. 2020

BioRes

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The wooden columns in timber structures of ancient buildings have column foot tenons of various sizes. The main reason for these differences is their use for different roof loads. Six full-scale specimens with different sizes of column foot tenon were designed and manufactured. The tree species used for the specimens was larch. The quasi-static test was conducted on the specimens that were used in timber structures of ancient buildings. The effects of column foot tenon size on the mechanical properties of larch wooden columns were studied. The moment-rotational angle hysteretic curves, moment-rotational angle skeleton curves, ductility, stiffness degradation, energy dissipation capacity, slippages between the wooden column and the plinth, and the damage of the column foot tenons were examined. The test results showed that the column foot tenon played an important role in the mechanical behavior of the wooden column under low-cycle reversed cyclic loading. The rotation of the column foot tenon improved the energy dissipation capacity of the wooden column. As the rotational angle of the column base increased, the column foot tenon had different degrees of damage. Different sizes of column foot tenon had their own advantages and hysteretic behavior.

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“…In fact, structural systems typically exhibit a non-linear behavior under exceptional actions like strong earthquakes [9][10][11]. This inelastic behavior entails beneficial effects due to the large amount of energy that can be dissipated during the hysteresis loops, so much so that a ductile and dissipative structural behavior is the basis of the modern design philosophy.…”

Section: Introductionmentioning

confidence: 99%

Some Issues in the Seismic Assessment of Shear-Wall Buildings through Code-Compliant Dynamic Analyses

Porcu

Vielma

Pais³

et al. 2022

Buildings

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Due to their excellent seismic behavior, shear wall-type concrete buildings are very popular in earthquake-prone countries like Chile. According to current seismic regulations, the performance of such structures can be indifferently assessed through linear or non-linear methods of analysis. Although all the code-compliant approaches supposedly lead to a safe design, linear approaches may be in fact less precise for catching the actual seismic performance of ductile and dissipative structures, which can even result in unconservative design where comparatively stiff buildings like reinforced-concrete shear-wall (RC-SW) buildings are concerned. By referring to a mid-rise multistory RC-SW building built in Chile and designed according to the current seismic Chilean code, the paper investigates the effectiveness of the linear dynamic analyses to predict the seismic performance of such kind of structures. The findings show that the code-compliant linear approaches (Modal Response Spectrum Analysis and Linear Time-History Analysis) may significantly underestimate the displacement demand in RC-SW buildings. This is highlighted by the comparison with the results obtained from the Non-Linear Time-History Analysis, which is expected to give more realistic results. A set of ten spectrum-consistent Chilean earthquakes was considered to carry out the time-history analyses while a distributed-plasticity fiber-based approach was adopted to model the non-linear behavior of the considered building. The paper highlights how the risk of an unsafe design may become higher when reference is made to the Chilean code, the latter considering only the Modal Response Spectrum Analysis (MRSA) without even providing corrective factors to estimate the inelastic displacement demand. The paper checks the effectiveness of some amplifying factors taken from the literature with reference to the case-study shear-wall building, concluding that they are not effective enough. The paper also warns against the danger of local soft-story collapse mechanisms, which are typical of reinforced concrete frames but may also affect RC-SW buildings when weaker structural parts made by column-like walls are present at the ground floor.

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Ductile Behavior of Timber Structures under Strong Dynamic Loads

Cited by 10 publications

References 42 publications

Effect of pinching on structural resilience: performance of reinforced concrete and timber structures under repeated cycles

Effect of pinching on structural resilience: performance of reinforced concrete and timber structures under repeated cycles

Effect of column foot tenon on behavior of larch column base joints based on concrete plinth

Some Issues in the Seismic Assessment of Shear-Wall Buildings through Code-Compliant Dynamic Analyses

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