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    Timber Frame Moment Joints with Glued-In Steel Rods. II: Experimental Investigation of Long-Term Performance

    Source: Journal of Structural Engineering:;2012:;Volume ( 138 ):;issue: 006
    Author:
    Massimo Fragiacomo
    ,
    Mark Batchelar
    DOI: 10.1061/(ASCE)ST.1943-541X.0000517
    Publisher: American Society of Civil Engineers
    Abstract: The pull-out performance of steel rods glued into timber is well-documented, and short-term tests by many researchers have demonstrated reliable strength. The behavior of glued-in steel rods in moment-resisting beam-column joints is much more complex because of anisotropy of wood in the connection region, discontinuity of material at the interface, and the possible effects of creep of timber and stress concentrations on the joint performance. This paper describes the results of a series of long-term load tests on moment-resisting joints between glulam members and separate load tests on the various joint components, including the epoxy itself and the timber stressed perpendicular to the grain. Different types of knee joints, with rods fully epoxied along their length or epoxied only in one member and tensioned in the other, and with different geometries (with the beam extended over the column or with the column extended past the beam) were tested. Measurements were recorded to identify time-dependent stress redistribution within the test joints, creep of the joint as a whole, and possible crushing of the timber-to-timber bearing surfaces. Local deformation of timber loaded in compression perpendicular to the grain was found to contribute to excessive joint deformations in tests in which the steel rods were not glued over their full length. The test results confirm the possibility to use the transformed section method in design as presented in the first companion paper, and address a number of issues pointed out in the same paper.
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      Timber Frame Moment Joints with Glued-In Steel Rods. II: Experimental Investigation of Long-Term Performance

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    contributor authorMassimo Fragiacomo
    contributor authorMark Batchelar
    date accessioned2017-05-08T21:59:44Z
    date available2017-05-08T21:59:44Z
    date copyrightJune 2012
    date issued2012
    identifier other%28asce%29st%2E1943-541x%2E0000558.pdf
    identifier urihttp://yetl.yabesh.ir/yetl/handle/yetl/68429
    description abstractThe pull-out performance of steel rods glued into timber is well-documented, and short-term tests by many researchers have demonstrated reliable strength. The behavior of glued-in steel rods in moment-resisting beam-column joints is much more complex because of anisotropy of wood in the connection region, discontinuity of material at the interface, and the possible effects of creep of timber and stress concentrations on the joint performance. This paper describes the results of a series of long-term load tests on moment-resisting joints between glulam members and separate load tests on the various joint components, including the epoxy itself and the timber stressed perpendicular to the grain. Different types of knee joints, with rods fully epoxied along their length or epoxied only in one member and tensioned in the other, and with different geometries (with the beam extended over the column or with the column extended past the beam) were tested. Measurements were recorded to identify time-dependent stress redistribution within the test joints, creep of the joint as a whole, and possible crushing of the timber-to-timber bearing surfaces. Local deformation of timber loaded in compression perpendicular to the grain was found to contribute to excessive joint deformations in tests in which the steel rods were not glued over their full length. The test results confirm the possibility to use the transformed section method in design as presented in the first companion paper, and address a number of issues pointed out in the same paper.
    publisherAmerican Society of Civil Engineers
    titleTimber Frame Moment Joints with Glued-In Steel Rods. II: Experimental Investigation of Long-Term Performance
    typeJournal Paper
    journal volume138
    journal issue6
    journal titleJournal of Structural Engineering
    identifier doi10.1061/(ASCE)ST.1943-541X.0000517
    treeJournal of Structural Engineering:;2012:;Volume ( 138 ):;issue: 006
    contenttypeFulltext
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