Estimation the remaining service-lifetime of wooden structure of geothermal cooling tower

• DOI: 10.1016/j.cscm.2017.01.001
• Publication Date: 2017-01-12T05:31:55Z
• Authors: Effendi Tri Bahtiar; Naresworo Nugroho; Mohamad Miftah Ra...; Arinana; Rita Kartika Sari; Wilis Wirawan; Dede Hermawan
• Keywords: Sequoia

Similar with other construction materials, wood strength is decreasing when applied by long term loading. Wooden cooling tower structure at Star Energy Geothermal (Wayang Windu) Ltd was built in 1998 and it should be evaluated to avoid sudden structural failure. Evaluation conducted through several steps: species identification, the physical mechanical properties testing, estimation for remaining service-lifetime generating mathematical models derived from creep test reduction of cross sectional area wood. Identification result that are redwood (Sequoia sempervirens) Douglas fir (Pseudotsuga menziesii). The density value has degraded surface until 0.25 cm depth. Strength characteristics have considerably decreased, but allowable stress bending, tension parallel grain, shear were still higher than NDS2005 requirements. compression grain slightly lower NDS, while perpendicular much lower. Average modulus elasticity reduces become stated code, minimum (Emin) code value, Emin Then, accordance those findings, would not failure yet deformation vibration will occur rate design planning. This research develops estimating wooden geothermal power plant based on performance resisting loading its deterioration rate. member 0.0147 depth per year, so equation residual service life σlaterσtoday=bh2(b−0.0147T)(h−0.0147T)2, σlater must stress.