Comparison of Round Timber and Squared Timber Joints Capacity in Tension at Different Angles to the Grain

In the current European standards for the design of timber structures, the issue of timber-to-timber joint type is addressed only for squared timber, which makes the pinpointing of the round timber bolted joints carrying capacity near-unfeasible due to the insufficient support in the current standards. To compare the behavior of this type of connections have been made a series of tests of round timber joints in different inclinations tensile load to the grains but also the reference tests of squared timber joints. Mechanical behavior of round and squared timber bolted joints were tested in the laboratory of the Faculty of Civil Engineering in Ostrava. This paper presents results of static tests in tension at an angle of 0°, 90°, 60° to the grain of squared and round timber bolted joints.