Simulated seismic testing of two pitched roofs constructed using timber trusses extracted from vintage unreinforced masonry buildings

Derakhshan, Hossein; Ingham, Jason; Griffith, Michael; Thambiratnam, David

doi:10.1002/eqe.3981

Cited by 2 publications

References 26 publications

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Vertical spanning wall elastically restrained at the top: validation and parametric dynamic analysis

Destro Bisol,

Prajapati,

Sorrentino

et al. 2024

Bull Earthquake Eng

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In unreinforced masonry structures, among the most dangerous events that can occur during earthquakes are the out-of-plane mechanisms. This type of response significantly changes if the wall is restrained by a horizontal element. The collapse, in this case, could take place for slipping/failure of the diaphragm connection or for overturning of the wall, following the formation of a crack at an intermediate height between the base and the top. A specific analytical model is used to capture the complex dynamic behavior of the wall, formed by two stacked rigid bodies (free to rock) with the top one connected to a flexible diaphragm. The model is calibrated using experimental data available in the literature and it is then used to carry out a dynamic parametric analysis. The variation range of relevant parameters refers to the building features surveyed in Emilia-Romagna region, Italy, and their effect on the global response of the system is investigated. Further, the influence of ground motion is considered, using different ground accelerations. The results of the analysis highlight that, for the considered area and return period, the maximum rotations of the system are significant only for large slenderness values. Further, the investigation shows that the diaphragm plays a crucial role in the dynamic response of the system. The stiffness of the diaphragm can significantly reduce the rotations and consequently the risk of overturning. Additionally, the study on the effect of the wall size pointed out how a top spring causes a reverse scale effect.

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Vertical spanning wall elastically restrained at the top: validation and parametric dynamic analysis

Destro Bisol,

Prajapati,

Sorrentino

et al. 2024

Bull Earthquake Eng

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Experimental Investigation and Finite Element Modelling for Solid Warren Dowelled Timber Roof Truss

Dzulkifli,

Hidayat,

Hassan

et al. 2024

Preprint

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Timber trusses are available in various sizes and shapes and can be placed in situ or prefabricated. Unfortunately, the usage of solid timber as a structural material is limited in Malaysia compared to concrete and steel. Hence, this research investigates the structural experimental performance and finite element modelling for solid timber Warren dowelled connections roof trusses using Chengal species. The goals encompassed assessing flexural performance, establishing a correlation between strength and stiffness, and conducting a comparative study between finite element analysis and experimental findings. The experimental research entailed subjecting a Warren roof truss constructed entirely from solid wood under four-point bending load testing. The truss exhibited a linear response during both the application and removal of the load until it reached its elastic limit. Nonlinearity, resulting from the deformation and fracturing of timber at connections, was detected when the load reached 68.88 kN, ultimately leading to failure at 182.76 kN. The displacements of different components were measured, indicating ductile behaviour and failure of the joints. The objective of utilising the ABAQUS program for finite element modelling was to corroborate the experimental findings. The first model displayed a 42.91% disparity in modulus of rupture (MOR) compared to the experimental results. By meticulously calibrating material properties, the model updating process resulted in a significant 75.23% enhancement in stress. This adjustment successfully aligned the stress values obtained from the Finite Element Method (FEM) with the experimental findings. Comparisons between the experimental and Finite Element Method (FEM) results for the Modulus of Rupture (MOR) demonstrate significant enhancement after the updating process, resulting in a decrease of ΔS from 42.91–0.036%. Direct comparison of displacement values was not possible due to substantial discrepancies. This study provides significant findings on the performance of solid Warren-dowelled timber roof trusses, highlighting the crucial role of exact calibration of material properties for accurate finite element modelling.

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Simulated seismic testing of two pitched roofs constructed using timber trusses extracted from vintage unreinforced masonry buildings

Cited by 2 publications

References 26 publications

Vertical spanning wall elastically restrained at the top: validation and parametric dynamic analysis

Vertical spanning wall elastically restrained at the top: validation and parametric dynamic analysis

Experimental Investigation and Finite Element Modelling for Solid Warren Dowelled Timber Roof Truss

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