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Asian Journal of Scientific Research

Year: 2014 | Volume: 7 | Issue: 4 | Page No.: 501-512
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Authors

Effendi Tri Bahtiar

Arinana

Naresworo Nugroho

Dodi Nandika

Keywords

Research Article

Daily Cycle of Air Temperature and Relative Humidity Effect to Creep Deflection of Wood Component of Low-cost House in Cibeureum-Bogor, West Java, Indonesia

Effendi Tri Bahtiar, Arinana, Naresworo Nugroho and Dodi Nandika
There are fluctuations of air temperature and relative humidity which make a cyclic loop every day. These fluctuations are caused by the sunrays radiation and earth surface energy. Sinusoidal equations are developed in this study to estimate the effect of both sunrays radiation and earth surface energy to the daily cycle of air temperature and relative humidity. A dummy variable is applied to represent the presence of sunrays radiation. The effect of this daily cycle to wood creep behavior is also studied. The wood samples which tested in this study are cut from the purlin of a 17 years old low cost house in Cibeureum Village, Bogor, West Java, Indonesia and identified as Saninten wood. Wood is more capable in resisting short term loading than long term loading. The deflections of wood beam under sustained load consist of initial deflection and creep deflection. Initial deflections immediately happen after load applied, while creep deflections is time dependent deflection as the result of viscous flow under long term loading and wood reaction to the surrounding condition (moisture content, temperature and relative humidity). Creep deflection is highly correlated with the logarithm of load duration. The creep deflection is increasing in decreasing rate as with the loading time for all of load level. The daily cycle of air temperature and relative humidity have opposite effect to the additional creep deflection. Air temperature has positive correlation with creep deflection, while relative humidity has negative correlation. Total additional creep deflection is superposition of both air temperature and relative humidity effects. The multiple regression analysis with logarithm transformation for load duration and sinusoidal transformation for daily cycle of air temperature and relative humidity are satisfactory fitted the empirical creep deflection data (R2 = 82.52-96.00%). This study succeed determining the daily fluctuation of temperature and relative humidity effects toward creep deflection by mathematical equation in regular room condition without controlling the surrounding condition.
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Effendi Tri Bahtiar, Arinana, Naresworo Nugroho and Dodi Nandika, 2014. Daily Cycle of Air Temperature and Relative Humidity Effect to Creep Deflection of Wood Component of Low-cost House in Cibeureum-Bogor, West Java, Indonesia. Asian Journal of Scientific Research, 7: 501-512.

DOI: 10.3923/ajsr.2014.501.512

URL: https://scialert.net/abstract/?doi=ajsr.2014.501.512

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