本文選題：螺栓連接 + 銷槽承壓　； 參考：《哈爾濱工業(yè)大學》2014年碩士論文

【摘要】：我國螺栓連接計算方法是假定被連接木構件的木材材質相同,銷槽承壓采用理想彈塑性本構模型。而美、歐等國家銷槽承壓采用剛塑性本構模型,考慮被連接構件木材的材質可以不同,并取多種失效模式中對應的最低承載力作為螺栓連接承載力設計值。顯然,國外的計算方法更適應現代木結構的需要,而我國的計算方法銷槽承壓采用理想彈塑性本構模型更加符合實際工況,本文通過大量算例對同種木材采用理想彈塑性模型計算得到的單剪連接螺栓連接理論承載力與通過剛塑性模型計算得到的理論承載力結果進行了對比,承載力計算結果差距在17%以內。說明我國原有的螺栓連接計算假定和推導方法是可行的。本文利用銷槽承壓理想彈塑性本構模型進行了不同材質木材六種破壞模式的螺栓連接承載力理論計算公式的推導,得到了不同材質木材螺栓連接彈塑性理論承載力計算公式。并通過大量算例對比了剛塑性模型單剪螺栓連接理論和彈塑性模型理論的計算結果,較薄、較厚構件銷槽承壓和形成兩個塑性鉸的破壞模式理論承載力計算公式相同,形成一個塑性鉸破壞模式承載力差距不大,鋼銷形成剛體轉動破壞模式計算結果相差較大。此外,我國木結構設計規(guī)范中取木材的順紋抗壓強度計算螺栓連接的承載力,作為現代木產品,同一樹種不同強度等級的木材,由于缺陷的影響,其順紋抗壓強度可以有很大不同,但木材缺陷對其銷槽承壓強度的影響并不顯著,同樹種不同強度等級的木材,其銷槽承壓強度并無很大差別。所以應利用銷槽承壓強度確定螺栓連接的承載力。針對上述問題,本文進行了12mm、14mm、16mm、18mm鋼銷直徑的樟子松和東北落葉松順紋、橫紋銷槽承壓試驗,共389個試件,并且分別測定了其質量和含水率,得到這兩種木材不同鋼銷直徑的順紋、橫紋銷槽承壓強度和木材氣干密度、含水率等,為螺栓連接承載力計算提供了重要參數,并且通過與美國、歐洲銷槽承壓強度計算結果對比,分析了銷槽承壓強度和木材材質、螺栓直徑的關系。進行了樟子松、東北落葉松順紋雙剪螺栓連接試驗,螺栓直徑分別為12mm、16mm、18mm,共4種破壞模式,48種連接形式,共144個試件,并利用銷槽承壓強度試驗結論,對比分析了螺栓連接試驗結果與彈塑性理論計算結果,發(fā)現試驗與理論結果符合較好,差距一般都在15%以內,只有一個試驗與理論結果相差大于20%。此外,進行了11個12mm螺栓直徑樟子松同種木材有墊片的螺栓連接對比試驗,發(fā)現當螺栓產生彎曲時,螺栓產生的“繩索效應”對承載力有一定提高,其中產生塑性鉸的破壞模式中“繩索效應”對螺栓連接承載力提高達到30%以上。有限元分析彈性階段采用多孔彈性模型,塑性階段采用Drucker-Prager本構模型,引入試驗得到的參數對試驗模型進行有限元分析,有限元模擬破壞模式、承載能力和試驗結果符合較好。且數值模擬、試驗結果、理論推導得到的螺栓連接承載力符合較好。最后,通過理論分析得到了木結構螺栓連接承載力設計公式,并確定了設計公式中銷槽承壓強度、螺栓強度的取值。
[Abstract]:The calculation method of bolt connection in China assumes that the wood material of the connected wood is the same material, and the ideal elastoplastic constitutive model of the pin groove is adopted. While the rigid plastic constitutive model is adopted in the pin trough of the United States, Europe and other countries, the wood material of the connected component can be different, and the corresponding minimum bearing capacity of various failure modes is taken as the bolt connection. It is obvious that the calculation method abroad is more adaptable to the needs of modern wood structure, but in our country, the ideal elastoplastic constitutive model is more in line with the actual working conditions. In this paper, the theoretical bearing capacity of the single shear connection bolt connection obtained by an ideal elastoplastic model for the same kind of wood is calculated by a large number of examples. Compared with the theoretical bearing capacity results obtained by the rigid plastic model, the difference between the calculation results of the bearing capacity is less than 17%. It shows that the original calculation hypothesis and the derivation method of the bolt connection in our country are feasible. In this paper, the bolt connection of the six failure modes of wood with different material is carried out by the ideal elastoplastic constitutive model of the pin trough bearing. Based on the derivation of the theoretical calculation formula of the bearing capacity, the elastic and plastic theoretical bearing capacity of wood bolt connection of different materials is obtained. Through a large number of examples, the calculation results of the single shear bolt connection theory and the elastoplastic model theory of the rigid plastic model are compared, and the failure modes of the two plastic hinges and the pressure of the thicker component pin and the formation of the plastic hinge are compared. On the same calculation formula of bearing capacity, the bearing capacity of the failure mode of a plastic hinge is not large, and the calculation result of the rigid body rotation failure mode of the steel pin is quite different. In addition, the bearing capacity of the bolt connection is calculated by the CIS compression strength of wood structure in our country. As a modern wood product, the strength grade of the same tree is different. Because of the effect of defects, the compressive strength of the wood can be greatly different, but the effect of wood defects on the pressure strength of the pin groove is not significant. There is no significant difference in the compressive strength of the grooves with the wood of different strength grades. Therefore, the bearing capacity of the bolt connection should be determined by the pressure of the pin groove. 12mm, 14mm, 16mm, 18mm steel pin diameter of Pinus sylvestris and Larix gmelinii, 389 specimens were tested, and their quality and moisture content were measured respectively. The CIS grain of the two kinds of steel pin diameter, the pressure strength of the transverse pin grooves and the dry density of wood gas, water content, etc. were used as the bolt connection bearing meter. An important parameter is provided, and the relationship between the pressure strength of the pin and the wood material and the diameter of the bolt is analyzed by comparison with the calculation results of the pressure strength of the American and European grooves. The bolt connection test of Pinus sylvestris and northeastern Larix Larix is carried out, the diameter of the bolt is 12mm, 16mm, 18mm, and 48 kinds of connection forms, a total of 14. The results of bolt connection test and elastoplastic theory are compared and analyzed with 4 specimens. The results show that the results are in good agreement with the theoretical results, and the gap is generally within 15%. Only one test and theoretical results are more than 20%., and 11 12mm bolt diameter of Pinus var. The bolted connection test of the gasket shows that when the bolt is bending, the "rope effect" produced by the bolt has a certain increase in the bearing capacity of the bolt. In the failure mode of the plastic hinge, the "rope effect" increases the bearing capacity of the bolt to more than 30%. The elastic model of the finite element analysis is adopted in the elastic stage and the plastic stage is adopted. The Drucker-Prager constitutive model is introduced by the finite element analysis of the experimental model by the parameters obtained by the test, the finite element simulation of the failure mode, the bearing capacity and the test results are in good agreement. And the numerical simulation, the experimental results, the theoretical deduction of the bolt connection bearing capacity is good. Finally, the wood structure bolt connection is obtained by theoretical analysis. The design formula of the bearing capacity is determined, and the value of the strength of the groove and the strength of the bolt are determined.
【學位授予單位】：哈爾濱工業(yè)大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TU366.2

【參考文獻】

相關期刊論文 前1條

1 樊承謀;按彈塑性工作原理推導木結構螺栓連接計算公式的基本原則——兼復〈對《木結構螺栓聯結工作原理及計算公式》一文的意見〉[J];哈爾濱建筑工程學院學報;1986年03期

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本文編號：1974192