Seismic Performance of Moment-Resisting Timber Frames with Fibre Reinforced and Densified Connections

Progress Structural Eng Maths

Haller

2006

This paper describes the analytical models that were used to simulate the full time‐history response of timber frames subjected to dynamic loads. Three‐dimensional models of two‐story timber frames were developed and verified via small‐ and full‐scale shake table experiments. The modeling of the hysteretic properties of the connections was presented in Part I. Verification of the frame model was done using the time‐history response and the dissipated energy as a measure of accuracy. The comparison reveals that the presented approach can be successfully used to simulate the load‐history‐dependent behavior of inelastic systems. The developed model reliably predicted the frame response in the nonlinear range and is capable of simulating initial slippage in the joints due to previous loading. The proposed model is applicable to design and analyze timber frames of arbitrary geometry and configuration under arbitrary loads.

“…The small‐scale experiments reported Heiduschke2 showed that the joint rotations reached a peak value of 0.085 rad. The moment‐rotation curves presented in Fig.…”

Section: Analytical Models Of Framesmentioning

confidence: 98%

Section: The Shake Table Experimentsmentioning

confidence: 99%

“…The joints were textile reinforced but undensified. Detailed information about the small‐scale tests is given by Heiduschke2.…”

Section: The Shake Table Experimentsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Analysis of wood‐composite laminated frames under dynamic loads ‐ analytical models and model validation. Part II: frame model

Heiduschke

Progress Structural Eng Maths

Haller

2006

“…A key aspect to the performance of these structures is the design of the beam-to-column connections (BCCs), which play an important role in withstanding extreme events, such as earthquakes. The performance of differing BCCs under dynamic loads has been under investigation for the past few decades; for example: plane moment-resisting BCCs were conducted by Buchanan and Fairweather (1993) for different connection types of laminated glulam frames, densified and reinforced laminated timber BCC done by Heiduschke (2005), and densified veneer wood and expanded steel tubes showing a relatively high-energy dissipation capacity done by Leijten et al (2006). Most of the research was concentrated on two-dimensional (2D) BCCs and shake table tests of plane frames.…”

Section: Introductionmentioning

confidence: 99%

Report on the seismic performance of three-dimensional moment-resisting timber frames with frictional damping in beam-to-column connections

Polocoșer

Leimcke²,

Advances in Structural Engineering

2018

The seismic performance of three-dimensional moment-resisting timber frames with frictional damping devices was investigated experimentally. This article describes a novel three-dimensional beam-to-column connection which was designed to behave rigidly up to moderate seismic intensities and to start the frictional dissipating behavior at higher intensities. The three-dimensional beam-tocolumn connection component was initially tested under cyclic loading, and then the connection was mounted in a three-level prototype frame and tested on a shake table. From the cyclic loading tests, the energy dissipation of the proposed beam-to-column connection was higher than the equivalent rigid connection. The frame demonstrated self-aligning capabilities without permanent drift at seismic intensities up to 1.4 g and maintained strength up to high seismic intensities of 2 g. Because wood frames allow for large elastic deflections and can exhibit excellent self-aligning capabilities (i.e., connections tolerate large rotations within safe stress levels), the proposed frictional beam-to-column connection is a promising alternative for moment-resisting timber frames that can be used to prevent structural members from reaching critical stresses.

Echtzeit‐Röntgenuntersuchungen an duktilen stabförmigen Holzverbindungen bei dynamischer Beanspruchung

Wehsener

2008

Bautechnik

Der Beitrag beschreibt die Möglichkeiten von Röntgenuntersuchungen an stabförmigen Holzverbindungsmitteln im beanspruchten Bauteil. Trotz verschiedenartiger Untersuchungsmethoden ist die Bestimmung des tatsächlichen Verhaltens von metallischen Verbindungsmitteln im Holz während der Belastung nicht ausreichend gelöst. Mit Hilfe verschiedener mathematischer Ansätze und der Einbeziehung von Materialkennwerten ist die Modellierung von Holzverbindungen möglich. Die Nutzung von Röntgenstrahlen unter Echtzeitwiedergabe ermöglicht es, das Verformungsverhalten von metallischen Verbindungsmitteln während der Lasteinleitung zu beobachten.Ziel der Versuche war die Bestimmung des Verformungsverhaltens einer Stabdübelverbindung in Echtzeit unter quasistatischer und dynamischer Belastung. Mit der Echtzeit‐radio‐graphischen Messung wurden Versuche am Einzelstabdübel und einer Dübelgruppe durchgeführt. Die beim Versuch genutzte Anlage besteht aus einer mobilen Röntgenröhre und einem Detektor, sowie der dazugehörigen digitalen Bildverarbeitung. Bei maximaler Geschwindigkeit von 30 Bildern in der Sekunde wird eine Grenzwertauflösung von 1,97 lp/mm erreicht. Die Pixelteilung ist mit 127 μm2 durch das Empfängermodul vorgegeben [10]. In Abhängigkeit der gewählten Parameter konnte die Verschiebung um einen Bildpunkt (0,21 mm) verifiziert werden. Eine Überprüfung der gemessenen Verformungen der Stabdübel erfolgte mit Hilfe von direkt aufgebrachten Dehnmessstreifen.