One of the pressing issues is the development of existing methods for connecting elements of wooden structures and the creation of new ones. In pursuit of advancing and improving mechanical connection elements, steel rods with a twisted cross-section in the shape of a cross have been developed. The main advantages of such connections include: integration into the wood mass without prior drilling, the ability to withstand both bending and significant tensile forces, the possibility of employing rapid driving methods, including ballistic techniques, and securing elements in their designed position without auxiliary components. These advantages allow for a reduction in material consumption and labor intensity when making connections, significantly shortening the assembly time required. The methodology and results of experimental studies on wooden beams under prolonged load conditions have been examined. The tested beams, each measuring 3.0 m in length, feature a composite cross-section composed of two wooden beams connected using twisted steel cross-section rods with dimensions of 12 mm. The load on the beam was applied as concentrated forces at four points evenly distributed along the length of the beam. During the tests for prolonged loading and to determine the actual performance of the beam and its connection elements, deflections were measured at the midspan and one-third points of the span, along with support settlements and displacements at the ends of both the lower and upper beams. The duration of the tests was 120 days. The experimental studies established that the deformability of the test beams follows the usual temporal patterns regarding the strength changes in wood under prolonged loading, which can be described by a decaying exponential relationship. The research confirmed the reliability of composite section structures made using twisted steel cross-section rods.