Creep Properties of Walikukun (Schouthenia ovata) Timber Beams

Ali Awaludin (Research Group of Innovative Sustainable Infrastructure Materials and Construction Technologies, Department of Civil and Environmental Engineering, Gadjah Mada University, Grafika Street # 2, UGM campus, Sleman, Yogyakarta)
Ngudiyono Ngudiyono (Department of Civil Engineering, Faculty of Engineering, Mataram University, Majapahit street # 62, Nusa Tenggara Barat)
Achmad Basuki (SMARTWood Research Group, Department of Civil Engineering, Faculty of Engineering, Sebelas Maret University, Ir Sutami street # 36A, Surakarta)

Civil Engineering Dimension
Vol. 18 No. 2 (2016): SEPTEMBER 2016

This study presents an evaluation of creep constants of Walikukun (Schoutheniaovata) timber beams when rheological model of four solid elements, which is obtained byassembling Kelvin and Maxwell bodies in parallel configuration, was adopted. Creep behaviorobtained by this method was further discussed and compared with creep behavior developedusing phenomenological model of the previous study. Creep data of previous study was deformationmeasurement of Walikukun beams having cross-section of 15 mm by 20 mm with a clearspan of 550 mm loaded for three weeks period under two different room conditions: with andwithout Air Conditioner. Creep behavior given by both four solid elements model and phenomenological(in this case are power functions) had good agreement during the period of creepmeasurement, but they give different prediction of creep factor beyond this period. The powerfunction of phenomenological model could give a reasonable creep prediction, while for the foursolid elements model a necessary modification is required to adjust its long-term creep behavior.