本文選題：植筋 + 膠合竹��； 參考：《湖南大學(xué)》2015年碩士論文

【摘要】：隨著現(xiàn)代竹結(jié)構(gòu)的發(fā)展,結(jié)構(gòu)對節(jié)點性能的要求越來越高,對于某些重型竹結(jié)構(gòu)建筑,采用傳統(tǒng)的節(jié)點連接方式難以滿足結(jié)構(gòu)對剛度和承載力的要求。植筋連接作為一種新型連接方式,具有承載力高、剛度大和耐久性好等優(yōu)點,對于推進(jìn)現(xiàn)代竹結(jié)構(gòu)的發(fā)展有重要意義,然而,目前國內(nèi)外對膠合竹植筋連接的研究還很少。本文選取截面尺寸a、螺桿直徑dr、長細(xì)比λ和膠層厚度t為試驗參數(shù),設(shè)計了兩組試驗,分別對GluBam植筋連接的力學(xué)性能和錨固機(jī)理展開研究,為GluBa m的植筋連接設(shè)計提供基礎(chǔ)性數(shù)據(jù)。本文開展的主要工作及取得的成果如下:首先,通過對96根GluBam植筋試件進(jìn)行對拉試驗,探討了各參數(shù)對Glu Bam植筋連接性能的影響,并得到了3種典型破壞模式,分別為Glu Bam的分層開裂破壞、螺桿從GluBam中被拔出和螺桿屈服。研究結(jié)果表明,當(dāng)截面尺寸a較小時,試件容易發(fā)生Glu Bam的分層開裂破壞;長細(xì)比λ對植筋連接的力學(xué)性能和破壞模式有顯著影響,并且存在一個臨界長細(xì)比λcr,當(dāng)長細(xì)比λ達(dá)到臨界長細(xì)比λcr時,試件發(fā)生螺桿屈服破壞,破壞前試件有明顯的變形,屬于延性破壞,當(dāng)螺桿直徑dr為12mm時,λcr為12.5,當(dāng)dr為16mm和20mm時,λc r為15;此外,螺桿的直徑和膠層厚度對試件的破壞形態(tài)也有一定的影響。其次,通過對32根螺桿內(nèi)貼片的GluBam植筋試件進(jìn)行對拉試驗,揭示了各參數(shù)對Glu Bam植筋連接剪應(yīng)力分布規(guī)律的影響,試驗結(jié)果表明,各參數(shù)對界面上黏結(jié)應(yīng)力的峰值及其位置等均有影響。基于線彈性假設(shè),本文提出了植筋錨固力計算模型,并與試驗數(shù)據(jù)進(jìn)行了對比分析,對比結(jié)果表明,線彈性分析模型與試驗結(jié)果吻合較好。最后,基于試驗結(jié)果,本文擬合得到了Glu Bam植筋連接的錨固抗拔力計算公式,給出了具有一定可靠度的長細(xì)比數(shù)值解。結(jié)合木結(jié)構(gòu)植筋的研究成果以及本文的研究結(jié)果,給出了Glu Bam植筋連接參數(shù)的設(shè)計建議取值:GluBam的截面邊長a應(yīng)為螺桿直徑dr的7倍,螺桿直徑不宜超過M20,錨固長細(xì)比λ應(yīng)大于植筋的臨界長細(xì)比λcr但不應(yīng)超過極限長細(xì)比λu,膠層的厚度宜取2mm,此外,在植筋設(shè)計過程中還應(yīng)考慮施工質(zhì)量對植筋性能的影響。
[Abstract]:With the development of modern bamboo structures, the performance of joints is becoming more and more important. For some heavy-duty bamboo structures, it is difficult to meet the requirements of stiffness and bearing capacity by using the traditional connection method. As a new type of connection, it has the advantages of high bearing capacity, high stiffness and good durability. It is of great significance to promote the development of modern bamboo structure. However, there are few researches on glued bamboo planting connections at home and abroad. In this paper, the cross section size a, screw diameter drr, aspect ratio 位 and rubber thickness t are selected as test parameters, and two groups of tests are designed to study the mechanical properties and anchoring mechanism of GluBam tendons. It provides the basic data for the design of GluBa m. The main work and results obtained in this paper are as follows: firstly, through tensile tests on 96 GluBam tendons, the effects of various parameters on the connection properties of Glu Bam tendons are discussed, and three typical failure modes are obtained. The delamination cracking of Glu Bam, the pull-out of the screw from GluBam and the yield of the screw, respectively. The results show that the delamination cracking of Glu Bam is easy to occur when the section size a is small, and the aspect ratio 位 has a significant effect on the mechanical properties and failure mode of the connection. And there exists a critical slenderness ratio 位 cr.When the slenderness ratio 位 reaches the critical aspect ratio 位 cr, the screw yield failure occurs in the specimen, and the specimen has obvious deformation before failure, which belongs to ductile failure. When the diameter of screw is 12mm, 位 cr is 12.5, and when dr is 16mm and 20mm, 位 c r is 15. In addition, the diameter of screw and the thickness of adhesive layer also have some influence on the failure mode of the specimen. Secondly, the effects of various parameters on the shear stress distribution of Glu Bam connections are revealed by the tensile test of 32 GluBam tendons attached to the screws. The experimental results show that the shear stress distribution of Glu Bam connections is affected by the experimental results. Each parameter has an effect on the peak value and position of bond stress at the interface. Based on the assumption of linear elasticity, this paper puts forward a calculation model of anchor force of steel bars, and compares it with the experimental data. The comparison results show that the linear elastic analysis model is in good agreement with the experimental results. Finally, based on the experimental results, the formula of Anchorage pull-out force of Glu Bam connections is obtained, and the numerical solution of slenderness ratio with certain reliability is given. Combined with the research results of the wood structure and the research results of this paper, the design of the connecting parameters of Glu Bam tendons is given. It is suggested that the cross section side length a of 1: GluBam should be 7 times of the diameter of the screw rod. The screw diameter should not exceed M20, the Anchorage aspect ratio 位 should be greater than the critical aspect ratio 位 cr but not exceed the limit aspect ratio 位 u, and the thickness of rubber layer should be 2 mm. In addition, the effect of construction quality on the performance of planting reinforcement should be considered in the process of design.
【學(xué)位授予單位】：湖南大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TU366.3

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