小径木轻型木结构体系及受力性能研究
发布时间：2018-07-21 11:57
【摘要】：小径木是指径级较小的原木,主要来源于人工林抚育期间的间伐作业,是一种较廉价的自然资源。我国小径木的产量很大,但利用效率较低,经济效益较差,主要用作生产非结构用板材和造纸的原料,甚至直接用作燃料。为充分合理利用小径木,本文基于轻型木结构体系研发了小径木轻型木结构体系,提出了小径木组合墙骨、小径木墙骨剪力墙、小径木钢木组合搁栅、小径木钢木组合屋架以及小径木组合楼盖等5种构件的构造方案,对这些构件进行了试验研究、数值分析和理论分析,并给出了各类构件的承载力设计计算方法。研究表明提出的小径木轻型木结构体系的各类构件具有良好的受力性能,可以作为轻型木结构中对应构件的替代品使用。对小径木的材性进行了研究。通过对295个清材小试件和61个足尺构件进行材性试验,测定了东北落叶松小径木的物理力学性能,得到了其抗弯强度、抗弯弹性模量、顺纹抗拉强度、顺纹抗压强度和顺纹抗剪强度等物理力学性能指标,推测了东北落叶松小径材的强度设计值。制作了36根小径木组合墙骨,组成12个试件,对其6个试件进行了轴心受压试验,对另6个试件进行了偏心受压试验,获得了其承载力和破坏形式。建立了小径木组合墙骨的有限元模型,对其受力性能进行了分析。推导了小径木组合墙骨的换算长细比计算式,计算了其稳定承载力,并给出了小径木组合墙骨承载力设计值的计算方法。制作了15片足尺小径木墙骨剪力墙,进行了水平低周往复荷载试验,获得了其滞回曲线及破坏形式,经计算得到了墙体的各项承载性能指标。建立了覆面板钉连接的滞回模型,并应用该模型在ABAQUS中通过子程序建立了自定义钉连接单元,进而建立了剪力墙有限元模型,对小径木墙骨剪力墙的水平受力性能进行了参数分析。最终给出了小径木墙骨剪力墙的抗剪强度设计值。制作了18榀足尺小径木组合搁栅和6榀组合屋架,进行了搁栅受弯试验和屋架受力性能试验,获得了小径木组合搁栅和屋架的荷载-位移曲线和破坏形式。建立了小径木组合搁栅和屋架的有限元模型,分别对其进行了有限元分析,研究了不同构造改进措施对小径木组合搁栅和屋架受力性能的影响,提出了小径木组合搁栅和屋架承载力设计值的计算方法。制作了3个小径木组合楼盖,在楼盖平面内按三分点施加集中荷载,测得了楼盖的面内刚度。进行了楼盖覆面板钉连接试验,获得了楼盖覆面板钉连接的工作曲线。建立了小径木组合楼盖的有限元模型,对其进行了有限元分析。采用深梁-弹簧模型计算了楼盖刚度对水平荷载分配的影响,给出了剪力墙水平荷载分配系数的计算方法。
[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.
【学位授予单位】：哈尔滨工业大学
【学位级别】：博士
【学位授予年份】：2015
【分类号】：TU366.2
本文编号：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.
【学位授予单位】：哈尔滨工业大学
【学位级别】：博士
【学位授予年份】：2015
【分类号】：TU366.2
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