Abstract
The purpose of this paper is to adopt the Johansen's yielding theory as a possibility to predict the ultimate load for timber‐to‐concrete joints using self‐tapping threaded connectors screwed at an angle into the wood. The ultimate load‐bearing capacity of a single connector is predicted to be when either the stresses in the wood reach the plastic failure stress level or when a combination of plastic failure in wood and dowel is attained. K. W. Johansen assumed that no axial tension occurred in the dowel and, thus no frictional contribution affected the lateral load‐bearing capacity. However, the joints with inclined fasteners are first affected by tension load, so the withdrawal capacity of the screws has to be taken into account. In order to determine the load bearing capacity for specific connector geometry, the kinematical possible failure modes are determined. The screw in the concrete part of connection was taken as rigidly embedded and thus no deformations appeared. The study showed that the load‐bearing capacity for connections with inclined high tensile strength screws can be predicted using the yielding theory, but this theory was unable to predict precisely the failure mode. Possible reasons for that include limited fastener ductility and influence of the screw inclination on the strength properties of timber.
Highlights
The general yield theory exists since the 1940s
This paper presents derived basic equations for the determination of ultimate load bearing capacity of timberto-concrete joints with inclined screws, and the comparison between theoretical and experimental results
In this paper timber-to-concrete connections with inclined self-tapping screws were analysed according to the European Yield Model
Summary
The general yield theory exists since the 1940s. It is currently used in Europe where it provides a rational basis for setting design criteria for nailed, screwed, bolted and dowelled timber-to-timber joints. The ultimate lateral load of timber-totimber joints using inclined screw connectors can be defined using a theory of “yielding” (Johansen yielding theory) which assumes plasticity in both the wood and the fastener. Johansen first applied the theory [1] of plasticity to dowel-type connectors in wood Those design criteria for the single connector form the basis for the design of nailed timber-to-timber joints given in the Eurocode. In order to obtain the load bearing capacity of timber-to-concrete connection with inclined screws, which are principally loaded in tension, the Johansen theory is extended, taking into the account the withdrawal capacity of fastener and friction between contact interfaces of connected members. This paper presents derived basic equations for the determination of ultimate load bearing capacity of timberto-concrete joints with inclined screws, and the comparison between theoretical and experimental results
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