WOOD RESEARCH Volume 70, Number 2, 2025
YOSAFAT AJI PRANATA and BAMBANG SURYOATMONO

Behavior of Bolted Beam-to-Column Timber Connections using Double Steel Plates

This study aims to investigate the behavior of bolted beam-to-column timber connections with double steel plates. The behavior of the connections, as their strength, initial rotational stiffness, energy dissipation, and ductility ratio, were studied. Test specimens made of red meranti species (Shorea spp.) connected by 5-mm thick steel plates on both sides, and bolted joints of diameters 10 mm and 12 mm were used. Experimental tests of the connections conform to the EN 26891: 1991. The failure mode is splitting of the bolt row path in the column for all connections with the same numbers of bolts in the beam and the column, and splitting of the bolt row path in the beam for all connections with fewer numbers of bolts in the beam than those in the column. Moreover, the results show that the use of combined bolts and double steel plates has an impact in increasing both the ductility ratio and the energy dissipation of the connections

WOOD RESEARCH Volume 69, Number 4, 2024
YOSAFAT AJI PRANATA and BAMBANG SURYOATMONO

EXPERIMENTAL STUDY ON FLEXURAL BEHAVIOR OF RED MERANTI (SHOREA SPP.) GLULAM BEAM OF VARIOUS NUMBER OF LAMINAE

This research aims to study flexural behavior of Red Meranti (Shorea spp.) glulam beam of various number of laminae by carrying out testing beams made from four, six, and eight laminae. Four points bending test method according to ASTM 198-22 was applied. The research results show that glulam composed of a smaller number of laminas reaches a smaller flexural rigidity. The empirical equations for flexural strength ratio and modulus of rupture ratio, and the trend of flexural rigidity between glulam and solid proposed in this study can be used in designing the flexural members of timber buildings, timber bridges, and in calculating the deflection of timber beams

WOOD RESEARCH Volume 69, Number 3, 2024
YOSAFAT AJI PRANATA and BAMBANG SURYOATMONO

EXPERIMENTAL TESTS OF RED MERANTI (SHOREA SPP.) DOWEL BEARING STRENGTH AT AN ANGLE TO THE GRAIN

The angle to the grain has a significant influence on timber bearing strength. As the grain angle increases the bearing strength decreases. The aim of this research was to obtain the dowel bearing strength of the red meranti (Shorea spp.) timber at an angle to the grain. The scope of this research was as follows the specimens were made according to ASTM D143, the grain angle ranged from 0° to 12°, and the dowel bearing tests were displacement controlled in accordance with ASTM D5764. Results of this research was an empirical equation of dowel bearing strength (in MPa) in terms of an angle to grain θ (in degrees) namely Fe = 32.74 – 4.701θ + 0.2064θ2. The importance of studying the influence of the grain angle to the dowel bearing strength for timber connection design is because the direction of the timber grain is not perfectly 0°