【摘要】：在中國倡導低碳的大背景下，木結構建筑以及與之相關的木產業(yè)發(fā)展前景正在被越來越多的人看好。特別是沿海地區(qū)，例如海南，近幾年海南房地產進入高速發(fā)展期，旅游資源開發(fā)也進行得如火如荼，對于木結構建筑的需求十分旺盛，然而當地“日照、臺風、降雨”三強、“高溫、高濕、高鹽”三高的氣候環(huán)境特點使得對木結構建筑用材耐候性能、抗風性能、耐腐性能等要求大大提高。中國是地域差異較明顯的國家，各個地方氣候條件相差甚大，在木結構建筑進行施工以及施工一段時間后會發(fā)現，結構材料以及外飾面材料會產生開裂、變色、強度降低等現象，影響木結構建筑結構的安全性。 本文主要研究高溫高濕、高鹽環(huán)境對木結構建筑用材性能的影響。通過模擬不同的溫濕度環(huán)境以及不同濃度的鹽溶液分別對規(guī)格材握釘力、定向刨花板剪切性能以及齒板承載性能進行試驗分析。研究發(fā)現： 規(guī)格材握釘力表面和側面握釘力約為端面握釘力的4.27倍。三面握釘力會受三高環(huán)境的影響，其中濕度和鹽分對其影響較大，溫度對規(guī)格材幾乎沒有影響。隨著濕度和鹽分越大，規(guī)格材三面握釘力會逐漸減少，且各鹽度梯度間差異顯著。隨著高溫高濕處理周期的增加，規(guī)格材握釘力逐漸減小，隨著鹽分處理周期的增加，規(guī)格材握釘力先增大后減少，鹽溶液濃度每增加0.5%，各側握釘力下降了約為1%，在變化過程中均有一定的規(guī)律性。各側握釘力隨高溫高濕處理周期變化的函數關系式：表面握釘力為y=-2.5317x+42.435；側面握釘力為y=-2.6143x+43.589；端面握釘力為y=-0.7648x+15.716。上述式中x代表處理的周期數，y代表此時的握釘力大小。 高溫高濕高鹽環(huán)境對木結構釘連接抗剪性能的影響：濕度和鹽分對其影響較大，溫度對其幾乎沒有影響。隨著鹽濃度和溫濕度的上升，單剪試件在承載過程中彈性形變階段縮短，塑性形變階段延長，使其屈服荷載較��；隨著試件處理時間的延長，，各強度指標大體呈現下降的趨勢，中途會有微弱的上升。其中在高溫高濕處理中當處理周期達到48周期時，會達到極限荷載設計值。并能得出相應的回歸曲線。 高溫高濕高鹽環(huán)境對木結構齒板抗拉性能的影響：隨著處理濃度、溫濕度以及時間的遞增，齒板試件承載性能變化無明顯單調趨勢，較為平緩。隨著處理周期的逐漸增加，會由于規(guī)格材先破壞而導致實驗失敗，結構失效。 總體看來，在高溫高濕高鹽環(huán)境下，木結構握釘力性能最易受環(huán)境的影響，而木結構齒板抗拉性能在三高環(huán)境下最為穩(wěn)定。故三高環(huán)境下，相比于木構件釘連接，齒板的力學性能更為穩(wěn)定，更適用于沿海地區(qū)建筑用材。
[Abstract]:Against the background of low carbon in China, the prospect of wood structure building and its related wood industry is becoming more and more popular. Especially in coastal areas, such as Hainan, where real estate has entered a period of rapid development in recent years, the development of tourism resources is in full swing, and the demand for wooden structures is very strong. However, the local "sunshine, typhoon, rainfall" three strong forces, The climatic and environmental characteristics of "high temperature, high humidity and high salt" make the requirements of weathering resistance, wind resistance and corrosion resistance of wood structure building materials greatly improved. China is a country with obvious regional differences, and climate conditions vary greatly from place to place. After construction and construction of wooden structures for some time, it will be found that structural materials and exterior finishing materials will produce cracking and discoloration. The decrease of strength affects the safety of wood structure. In this paper, the effects of high temperature and high humidity and high salt environment on the properties of wood structure building materials are studied. Through simulating different temperature and humidity environment and different concentration of salt solution, the holding force of specification material, shear property of oriented particleboard and bearing capacity of tooth plate were tested and analyzed respectively. The results showed that the surface and side holding force of the specification material was about 4.27 times of that of the end face nail holding force. The strength of holding nail on three sides is affected by three high environment, humidity and salt have great influence on it, and temperature has little effect on the standard material. With the increase of humidity and salinity, the nail holding force on the three sides of the specification will gradually decrease, and the difference between the salinity gradient is significant. With the increase of high temperature and high humidity treatment cycle, the holding force of specification material decreases gradually, and with the increase of salt treatment cycle, the holding force of specification material increases first and then decreases. When the concentration of salt solution increased 0.5%, the holding force of each side decreased to about 1%, and there was a certain regularity in the process of change. The functional formula of the change of each side holding force with the period of high temperature and high moisture treatment was as follows: the surface holding force was yr 2.5317x 42.435, the side grip force was yr 2.6143x 43.589, and the end face holding nail force was yr -0.7648x 15.716. In the above formula, x represents the number of cycles in the process and y represents the holding force at this time. The influence of high temperature and high humidity and high salt environment on the shear resistance of wood structure nail joint: humidity and salt had great influence on it, but temperature had little effect on it. With the increase of salt concentration and temperature and humidity, the elastic deformation stage is shortened, the plastic deformation stage is prolonged, and the yield load is smaller. There will be a slight rise in the middle. In high temperature and high humidity treatment, the design value of ultimate load will be reached when the treatment cycle reaches 48 cycles. The corresponding regression curve can be obtained. The influence of high temperature and high humidity and high salt environment on the tensile properties of wood structure tooth plate: with the increase of treatment concentration, temperature, humidity and time, the load-bearing performance of the tooth plate has no obvious monotonic trend and is relatively flat. With the increasing of the treatment cycle, the failure of the test and the failure of the structure will be caused by the first destruction of the specification material. In general, under the environment of high temperature, high humidity and high salt, the grip strength of wood structure is the most easily affected by the environment, while the tensile performance of wood structure tooth plate is the most stable in the three high environment. Therefore, the mechanical properties of the tooth plate are more stable than that of the wood component nail connection under the three high environment, and are more suitable for building materials in coastal areas.
【學位授予單位】：南京林業(yè)大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TU366.2;S781

【參考文獻】

相關期刊論文 前10條

1 林利民,耿紹輝,王厚軍;輕型木結構建筑用覆面膠合板的產品特點及性能要求[J];人造板通訊;2004年07期

2 王春明;閆超;林利民;井學偉;王戈;耿紹輝;;木結構用膠合板膠合耐久性的試驗研究[J];中國人造板;2007年01期

3 闕澤利;蔣海東;付R

本文編號：2163765