Abstract

The use of moment-resisting frames with semi-rigid connections as a lateral load-carrying system in timber buildings can reduce the need for bracing with diagonal members or walls and allow for more open and flexible architecture. The overall performance of moment-resisting frames depends largely on the properties of their connections. Screwed-in threaded rods with wood screw thread feature high axial stiffness and capacity and they may be used as fasteners in beam-to-column, moment-resisting timber connections. In the present paper, a structural concept for a beam–to-column, moment-resisting timber connection based on threaded rods is presented and explained. Analytical expressions for the estimation of the rotational stiffness and the forces in the rods were derived based on a component-method approach. The analytical predictions for stiffness were compared to experimental results from full scale tests and the agreement was good.

Highlights

  • Considering structures subjected to horizontal loading, MRFs with semi-rigid, beam-to-column, moment-resisting connections as a lateral load-carrying system, can reduce the need for bracing with di­ agonal members or walls and allow for more open and flexible architecture

  • The coupling parts are connected to the column by use of a pair of inclined threaded rods in each side, see Fig. 1(a)

  • A component method approach was developed for the analytical prediction of the rotational stiffness by simple analytical expressions

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Summary

Background

WOODSOL is a Norwegian research project which aims to develop a structural system for multi-storey timber buildings based on momentresisting frames The design of multi-storey timber buildings is often governed by the fulfilment of serviceability re­ quirements, namely the restriction of wind-induced accelerations and deflections and human-induced vibrations within acceptable limits. Considering structures subjected to horizontal loading (e.g. wind), MRFs with semi-rigid, beam-to-column, moment-resisting connections as a lateral load-carrying system, can reduce the need for bracing with di­ agonal members or walls and allow for more open and flexible architecture. Recent studies [2,3] have shown that a minimum rota­ tional stiffness of connections of the order of 10000–15000 kNm/rad is required in multi-storey MRFs, in order to fulfil the serviceability re­ quirements due to wind-induced deflections and accelerations. In order to achieve the required rotational stiffness in connections with laterally loaded fasteners, a large number of fasteners and shear planes may be required. The mounting between the parts at the building site, should be simple, reliable and should not influence the stiffness of the connection

Outline
General remarks
Column-side connection
Beam-side connection
Metallic coupling parts
Spring components and force distribution
Rotational stiffness of entire connection
Capacity of threaded rods and coupling parts
Properties of threaded rods
Experimental validation
Connection with steel rings as coupling parts
Findings
Concluding remarks
Full Text
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