The Influence On Properties Of Wood Structure In High Temperature High Humidity And High Salinity

In China, people advocate low-carbon living environment. Timber construction and timberindustry therefore, see a more and more prosperous future. Especially in the coastal areas, such asHainan, in recent years, Hainan real estate has entered a period of rapid development, the tourismresources development has carried out like a raging fire, the wooden structure of the building isvery strong demanded. However, the characteristics of the climate which are "sunshine, rainfall,typhoon","three high temperature, high humidity, high salt" make the weathering resistance,wind resistance, corrosion resistance and other requirements of wood building timber greatlyimprove. Regional differences and climates are quite obvious in China. After timber constructionfor some time, it is easy to find that the construction materials and finish materials craze, discolor,and weaken, which threatens the safety of timberwork construction.This article mainly studies the effects of high temperatures, high humidity and high salinityon the performance of timber construction materials. Different temperature and humidity anddifferent concentrations of salt solution are respectively simulated to test and analyze theNail-holding power of dimension lumber, the shear performance of oriented strand board and theload-carrying performance of truss plate.The study finds that the surface and side nail holding power is4.27times bigger than theedge nail holding force. Nail holding force is affected by high temperatures, high humidity andhigh salinity, among which humidity and salinity has a significant impact while the temperaturehas little effects on dimension lumber. The higher humidity and salinity is, the weaker nailholding forces become. The concentration of salt solution for each additional0.5%, each sideholding nail force decreased by about1%.Besides, there is great difference between salinitygradients. With the extension of the treatment period of high temperature and humidity, the nailholding performance of dimension lumber will gradually decrease and the function relations ofeach side holding nail force was: the surface of nail holding power as y=-2.5317x+42.435; theside nail holding power as y=-2.6143x+43.589; end nail holding power as y=-0.7648x+15.716. The cycle number x represents the weeks of treatment; Y represents the nail holdingforce. With the extension of the salinity treatment period, the nail holding force will first increaseand then decrease in certain regularity.As for the effects of high temperatures, high humidity and high salinity on the shearperformance of oriented strand board, humidity and salinity has a significant impact while thetemperature has little effects. As the salt concentration, humidity and temperature increases, theelastic deformation of single shear model decreases and the plastic deformation increases, leadingto a small yield load. With the extension of the treatment period, the strength index trends down,but have a slight rise in the middle. When it reaches the48nd cycle under the treatment of hightemperature and humidity, it will also reach the ultimate load. And can draw the corresponding regression curve.As for the effects on tensile property of truss plate, the load-carrying performance has noobvious changes with the increasing concentration, humidity, temperature. With the gradualincrease of processing cycles, the dimension lumber breaks down, the test and the constructiontherefore comes to the failure.To sum up, the nail holding force of timberwork is easy to be effected by high temperature,high humidity and high sanity, while the tensile property of truss plate are quite stable. Comparedto nailed joints, truss plates have more stable mechanical property and are more suitable fortimbering in coastal areas.