Stiffness test in lateral direction of temporary wooden building supports

Temporary supports consisting of a jack, a stack of wooden cubic elements and a iron plate are used during the removal of buildings deflections by uneven raising. Where the weight of a building is rested on temporary supports with a considerable length, unintentional displacements of buildings in th...

Full description

Bibliographic Details
Main Author: Gromysz Krzysztof
Format: Article
Language:English
Published: EDP Sciences 2019-01-01
Series:MATEC Web of Conferences
Online Access:https://www.matec-conferences.org/articles/matecconf/pdf/2019/11/matecconf_krynica2018_10004.pdf
id doaj-1b22f08820514cc79cd890ae5c1692fe
record_format Article
spelling doaj-1b22f08820514cc79cd890ae5c1692fe2021-02-02T06:18:01ZengEDP SciencesMATEC Web of Conferences2261-236X2019-01-012621000410.1051/matecconf/201926210004matecconf_krynica2018_10004Stiffness test in lateral direction of temporary wooden building supportsGromysz Krzysztof0Silesian University of Technology, Faculty of Civil EngineeringTemporary supports consisting of a jack, a stack of wooden cubic elements and a iron plate are used during the removal of buildings deflections by uneven raising. Where the weight of a building is rested on temporary supports with a considerable length, unintentional displacements of buildings in the horizontal direction are seen. The displacements are connected with supports deformations caused by horizontal forces acting on the building part being raised. Non-vertically installed jacks, being part of the supports, are the most frequent reason for the occurrence of such forces. The jacks are not vertical due to deformations in the stack of wooden elements, upon which they are rested. In such case, the stiffness of temporary supports is essential for the safety of the deflection removal process. Laboratory tests of temporary supports were carried out and they showed that their stiffness, understood as a horizontal force divided by a displacement in the acting direction of the force, is not constant. The stiffness of supports is decreasing as the displacement amplitude grows. A considerable decrease in supports stiffness was experienced when positive longitudinal deformations occurred in the cross section of the support elements. As a result, the unconnected elements of the supports were unable to transmit positive stresses of this number. For the investigated range of loads, the deformations of the material of the supports elements were elastic. Inelastic forces were however generated along the contact points of the elements forming part of the supports, and such forces were responsible for creating a hysteresis loop and energy dissipation by the supports. The system, when a full load-unload cycle was applied, was returning to the initial position. Higher values of the energy dissipation coefficient correspond to higher values of a displacement amplitude.https://www.matec-conferences.org/articles/matecconf/pdf/2019/11/matecconf_krynica2018_10004.pdf
collection DOAJ
language English
format Article
sources DOAJ
author Gromysz Krzysztof
spellingShingle Gromysz Krzysztof
Stiffness test in lateral direction of temporary wooden building supports
MATEC Web of Conferences
author_facet Gromysz Krzysztof
author_sort Gromysz Krzysztof
title Stiffness test in lateral direction of temporary wooden building supports
title_short Stiffness test in lateral direction of temporary wooden building supports
title_full Stiffness test in lateral direction of temporary wooden building supports
title_fullStr Stiffness test in lateral direction of temporary wooden building supports
title_full_unstemmed Stiffness test in lateral direction of temporary wooden building supports
title_sort stiffness test in lateral direction of temporary wooden building supports
publisher EDP Sciences
series MATEC Web of Conferences
issn 2261-236X
publishDate 2019-01-01
description Temporary supports consisting of a jack, a stack of wooden cubic elements and a iron plate are used during the removal of buildings deflections by uneven raising. Where the weight of a building is rested on temporary supports with a considerable length, unintentional displacements of buildings in the horizontal direction are seen. The displacements are connected with supports deformations caused by horizontal forces acting on the building part being raised. Non-vertically installed jacks, being part of the supports, are the most frequent reason for the occurrence of such forces. The jacks are not vertical due to deformations in the stack of wooden elements, upon which they are rested. In such case, the stiffness of temporary supports is essential for the safety of the deflection removal process. Laboratory tests of temporary supports were carried out and they showed that their stiffness, understood as a horizontal force divided by a displacement in the acting direction of the force, is not constant. The stiffness of supports is decreasing as the displacement amplitude grows. A considerable decrease in supports stiffness was experienced when positive longitudinal deformations occurred in the cross section of the support elements. As a result, the unconnected elements of the supports were unable to transmit positive stresses of this number. For the investigated range of loads, the deformations of the material of the supports elements were elastic. Inelastic forces were however generated along the contact points of the elements forming part of the supports, and such forces were responsible for creating a hysteresis loop and energy dissipation by the supports. The system, when a full load-unload cycle was applied, was returning to the initial position. Higher values of the energy dissipation coefficient correspond to higher values of a displacement amplitude.
url https://www.matec-conferences.org/articles/matecconf/pdf/2019/11/matecconf_krynica2018_10004.pdf
work_keys_str_mv AT gromyszkrzysztof stiffnesstestinlateraldirectionoftemporarywoodenbuildingsupports
_version_ 1724301593254297600