WOOD RESEARCH Volume 71, Number 2, 2026
JÁN BRODNIANSKY, SILVIA MARTINKOVIČOVÁ, Jaroslav Sandanus, TOMÁŠ KLAS, JIŘÍ KUNECKÝ, JIŘÍ BLÁHA, and MICHAL KLOIBER

THE EXPERIMENTAL INVESTIGATION OF A MODEL OF A HISTORICAL-TYPE TIMBER ROOF SEGMENT UNDER PROGRESSIVE TIE-BEAM WEAKENING

This paper reports on an experimental study of a model of a historical timber roof segment subjected to progressive weakening of the central tie beam. A three-frame specimen was tested under controlled loading, short-term sustained full load, and sequential cutting of the middle tie beam. Close-range photogrammetry was combined with inductive displacement sensors and conventional control measurements. The study examined the agreement of optical and contact measurements, redistribution of displacement demand to the adjacent frames, and the temporary residual stability provided by lathing after complete failure of the middle tie beam. Across the tie-beam midspans, the mean absolute difference between inductive and paired optical measurements ranged from 0.07 to 0.40 mm, with a maximum point-wise deviation of 1.39 mm. After complete failure, additional settlement of the two intact frames reached 4.28 and 3.97 mm relative to the pre-cut full-load state, indicating longitudinal redistribution through the lathing.

WOOD RESEARCH Volume 69, Number 3, 2024
ROMAN HERDA, MILOŠ SLIVANSKÝ, JÁN BRODNIANSKY, and TOMÁŠ KLAS

DETERMINATION OF FLEXURAL STRENGTH AND YOUNG’S MODULUS OF ELASTICITY OF ACTIVELY BENT WOOD

The article focuses on the experimental verification of wooden laths with a cross-section of 10 mm x 40 mm which were selected for active bending. The laths are made of pine wood and are 2 m in length. The research includes experimental measurements to determine the limit deformations achieved by bending the wood without chemical treatment, by applying compressive force to an originally straight beam, causing it to buckle and further deform. Ten bending tests of beams were performed, and from the same pieces, 21 tests were conducted using the four-point bending test to determine the flexural strength, and 30 tests to determine the global modulus of elasticity

WOOD RESEARCH Volume 61, Number 4, 2016
Vladimír Duchoň, TOMÁŠ KLAS, Orsolya Katona, JÁN BRODNIANSKY, Ľuboš Balcierák, Jaroslav Sandanus, and Kristian Sógel

Experimental tests of timber connections with glued-in rods in bending

The article deals with research of joints with glued-in threaded rods. The introduction provides a brief presentation of the issue. The first part focuses on axially loaded glued-in threaded rods. The second part explains the behaviour of joints with glued-in rods loaded by bending moment. Theoretical analysis was performed on models based on the finite element method. Verification of theoretical results was realized by practical experiments. Tensile tests were carried out on timber blocks with glued-in bars to verify the depth of affixing. Furthermore, the resistance in bending was confirmed on actual beams with glued-in bars in the middle of the span. Results and the follow-up work are summarized in the conclusion.