小徑木輕型木結(jié)構(gòu)體系及受力性能研究
發(fā)布時(shí)間：2018-07-21 11:57
【摘要】：小徑木是指徑級(jí)較小的原木,主要來(lái)源于人工林撫育期間的間伐作業(yè),是一種較廉價(jià)的自然資源。我國(guó)小徑木的產(chǎn)量很大,但利用效率較低,經(jīng)濟(jì)效益較差,主要用作生產(chǎn)非結(jié)構(gòu)用板材和造紙的原料,甚至直接用作燃料。為充分合理利用小徑木,本文基于輕型木結(jié)構(gòu)體系研發(fā)了小徑木輕型木結(jié)構(gòu)體系,提出了小徑木組合墻骨、小徑木墻骨剪力墻、小徑木鋼木組合擱柵、小徑木鋼木組合屋架以及小徑木組合樓蓋等5種構(gòu)件的構(gòu)造方案,對(duì)這些構(gòu)件進(jìn)行了試驗(yàn)研究、數(shù)值分析和理論分析,并給出了各類構(gòu)件的承載力設(shè)計(jì)計(jì)算方法。研究表明提出的小徑木輕型木結(jié)構(gòu)體系的各類構(gòu)件具有良好的受力性能,可以作為輕型木結(jié)構(gòu)中對(duì)應(yīng)構(gòu)件的替代品使用。對(duì)小徑木的材性進(jìn)行了研究。通過(guò)對(duì)295個(gè)清材小試件和61個(gè)足尺構(gòu)件進(jìn)行材性試驗(yàn),測(cè)定了東北落葉松小徑木的物理力學(xué)性能,得到了其抗彎強(qiáng)度、抗彎彈性模量、順紋抗拉強(qiáng)度、順紋抗壓強(qiáng)度和順紋抗剪強(qiáng)度等物理力學(xué)性能指標(biāo),推測(cè)了東北落葉松小徑材的強(qiáng)度設(shè)計(jì)值。制作了36根小徑木組合墻骨,組成12個(gè)試件,對(duì)其6個(gè)試件進(jìn)行了軸心受壓試驗(yàn),對(duì)另6個(gè)試件進(jìn)行了偏心受壓試驗(yàn),獲得了其承載力和破壞形式。建立了小徑木組合墻骨的有限元模型,對(duì)其受力性能進(jìn)行了分析。推導(dǎo)了小徑木組合墻骨的換算長(zhǎng)細(xì)比計(jì)算式,計(jì)算了其穩(wěn)定承載力,并給出了小徑木組合墻骨承載力設(shè)計(jì)值的計(jì)算方法。制作了15片足尺小徑木墻骨剪力墻,進(jìn)行了水平低周往復(fù)荷載試驗(yàn),獲得了其滯回曲線及破壞形式,經(jīng)計(jì)算得到了墻體的各項(xiàng)承載性能指標(biāo)。建立了覆面板釘連接的滯回模型,并應(yīng)用該模型在ABAQUS中通過(guò)子程序建立了自定義釘連接單元,進(jìn)而建立了剪力墻有限元模型,對(duì)小徑木墻骨剪力墻的水平受力性能進(jìn)行了參數(shù)分析。最終給出了小徑木墻骨剪力墻的抗剪強(qiáng)度設(shè)計(jì)值。制作了18榀足尺小徑木組合擱柵和6榀組合屋架,進(jìn)行了擱柵受彎試驗(yàn)和屋架受力性能試驗(yàn),獲得了小徑木組合擱柵和屋架的荷載-位移曲線和破壞形式。建立了小徑木組合擱柵和屋架的有限元模型,分別對(duì)其進(jìn)行了有限元分析,研究了不同構(gòu)造改進(jìn)措施對(duì)小徑木組合擱柵和屋架受力性能的影響,提出了小徑木組合擱柵和屋架承載力設(shè)計(jì)值的計(jì)算方法。制作了3個(gè)小徑木組合樓蓋,在樓蓋平面內(nèi)按三分點(diǎn)施加集中荷載,測(cè)得了樓蓋的面內(nèi)剛度。進(jìn)行了樓蓋覆面板釘連接試驗(yàn),獲得了樓蓋覆面板釘連接的工作曲線。建立了小徑木組合樓蓋的有限元模型,對(duì)其進(jìn)行了有限元分析。采用深梁-彈簧模型計(jì)算了樓蓋剛度對(duì)水平荷載分配的影響,給出了剪力墻水平荷載分配系數(shù)的計(jì)算方法。
[Abstract]:Small diameter wood refers to the log with small diameter grade, which is mainly derived from the thinning operation during the tending period of artificial forest and is a kind of cheaper natural resources. The yield of small diameter wood in China is very large, but its utilization efficiency is low and its economic benefit is poor. It is mainly used as raw material for the production of non-structural planks and papermaking, and even as fuel directly. In order to make full and reasonable use of small diameter wood, this paper develops a light wood structure system based on light wood structure system, and puts forward the small diameter wood composite wall bone, small diameter wood wall bone shear wall, small diameter wood and steel wood composite joist. The structural schemes of five kinds of members, such as small diameter, steel and wood composite roof truss and small diameter wood composite floor, are studied experimentally, numerically and theoretically, and the design and calculation methods of bearing capacity of each kind of members are given. The study shows that the proposed light wood structure system has good mechanical properties and can be used as a substitute for the corresponding components in the light wood structure. The wood properties of small diameter wood were studied. The physical and mechanical properties of Larix gmelini (Larix gmelinii) small diameter wood were measured by means of material properties tests on 295 small specimens and 61 full-scale components. The bending strength, modulus of elasticity and tensile strength along grain were obtained. The physical and mechanical properties such as the compression strength and shearing strength of the parallel grain were calculated and the strength design values of the small diameter timber of Larix gmelini were inferred. A total of 36 small diameter wood composite wall bones were made and 12 specimens were formed. The axial compression tests were carried out on 6 of the specimens and the eccentric compression tests were carried out on the other 6 specimens. The bearing capacity and failure form of the specimens were obtained. The finite element model of small diameter wood composite wall is established and its mechanical performance is analyzed. In this paper, the calculating formula of the conversion aspect ratio of small diameter wood composite wall bone is derived, its stable bearing capacity is calculated, and the method of calculating the design value of small diameter wood composite wall bone bearing capacity is given. In this paper, 15 shear walls with full diameter wood wall are made, the horizontal low cycle reciprocating load test is carried out, the hysteretic curve and failure form are obtained, and the load-bearing performance indexes of the wall are obtained by calculation. The hysteretic model of overlay plate nail connection is established, and the self-defined nail connection element is established by subroutine in Abaqus, and then the shear wall finite element model is established. The horizontal mechanical behavior of small diameter wood shear wall is analyzed. Finally, the design value of shear strength of small diameter wood wall bone shear wall is given. Eighteen full diameter wood composite joists and 6 composite roof trusses were made. The flexural tests and truss stress tests were carried out. The load-displacement curves and failure modes of small diameter wood composite joists and roof trusses were obtained. The finite element model of small diameter wood composite joist and roof truss is established, and the finite element analysis is carried out, and the influence of different structural improvement measures on the mechanical performance of small diameter wood composite joist and roof truss is studied. The design method of bearing capacity of small diameter wood composite joist and roof truss is presented. Three small diameter wood composite floors were made and concentrated loads were applied on the floor plane according to the three points. The in-plane stiffness of the floor was measured. In this paper, the working curve of the floor cover panel nail connection is obtained by the test of the floor cover panel nail connection. The finite element model of small diameter wood composite floor is established, and the finite element analysis is carried out. The influence of floor stiffness on horizontal load distribution is calculated by using deep beam-spring model, and the calculation method of horizontal load distribution coefficient of shear wall is given.
【學(xué)位授予單位】：哈爾濱工業(yè)大學(xué)
【學(xué)位級(jí)別】：博士
【學(xué)位授予年份】：2015
【分類號(hào)】：TU366.2
本文編號(hào)：2135449
[Abstract]:Small diameter wood refers to the log with small diameter grade, which is mainly derived from the thinning operation during the tending period of artificial forest and is a kind of cheaper natural resources. The yield of small diameter wood in China is very large, but its utilization efficiency is low and its economic benefit is poor. It is mainly used as raw material for the production of non-structural planks and papermaking, and even as fuel directly. In order to make full and reasonable use of small diameter wood, this paper develops a light wood structure system based on light wood structure system, and puts forward the small diameter wood composite wall bone, small diameter wood wall bone shear wall, small diameter wood and steel wood composite joist. The structural schemes of five kinds of members, such as small diameter, steel and wood composite roof truss and small diameter wood composite floor, are studied experimentally, numerically and theoretically, and the design and calculation methods of bearing capacity of each kind of members are given. The study shows that the proposed light wood structure system has good mechanical properties and can be used as a substitute for the corresponding components in the light wood structure. The wood properties of small diameter wood were studied. The physical and mechanical properties of Larix gmelini (Larix gmelinii) small diameter wood were measured by means of material properties tests on 295 small specimens and 61 full-scale components. The bending strength, modulus of elasticity and tensile strength along grain were obtained. The physical and mechanical properties such as the compression strength and shearing strength of the parallel grain were calculated and the strength design values of the small diameter timber of Larix gmelini were inferred. A total of 36 small diameter wood composite wall bones were made and 12 specimens were formed. The axial compression tests were carried out on 6 of the specimens and the eccentric compression tests were carried out on the other 6 specimens. The bearing capacity and failure form of the specimens were obtained. The finite element model of small diameter wood composite wall is established and its mechanical performance is analyzed. In this paper, the calculating formula of the conversion aspect ratio of small diameter wood composite wall bone is derived, its stable bearing capacity is calculated, and the method of calculating the design value of small diameter wood composite wall bone bearing capacity is given. In this paper, 15 shear walls with full diameter wood wall are made, the horizontal low cycle reciprocating load test is carried out, the hysteretic curve and failure form are obtained, and the load-bearing performance indexes of the wall are obtained by calculation. The hysteretic model of overlay plate nail connection is established, and the self-defined nail connection element is established by subroutine in Abaqus, and then the shear wall finite element model is established. The horizontal mechanical behavior of small diameter wood shear wall is analyzed. Finally, the design value of shear strength of small diameter wood wall bone shear wall is given. Eighteen full diameter wood composite joists and 6 composite roof trusses were made. The flexural tests and truss stress tests were carried out. The load-displacement curves and failure modes of small diameter wood composite joists and roof trusses were obtained. The finite element model of small diameter wood composite joist and roof truss is established, and the finite element analysis is carried out, and the influence of different structural improvement measures on the mechanical performance of small diameter wood composite joist and roof truss is studied. The design method of bearing capacity of small diameter wood composite joist and roof truss is presented. Three small diameter wood composite floors were made and concentrated loads were applied on the floor plane according to the three points. The in-plane stiffness of the floor was measured. In this paper, the working curve of the floor cover panel nail connection is obtained by the test of the floor cover panel nail connection. The finite element model of small diameter wood composite floor is established, and the finite element analysis is carried out. The influence of floor stiffness on horizontal load distribution is calculated by using deep beam-spring model, and the calculation method of horizontal load distribution coefficient of shear wall is given.
【學(xué)位授予單位】：哈爾濱工業(yè)大學(xué)
【學(xué)位級(jí)別】：博士
【學(xué)位授予年份】：2015
【分類號(hào)】：TU366.2
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