【作者】 张鹏；

【导师】 程东辉；

【作者基本信息】 东北林业大学 ， 结构工程， 2013， 硕士

【摘要】 随着经济的发展和社会的进步,可持续发展问题和生态建设的理念逐渐受到人们的重视。木材作为唯一可再生的绿色建材再次受到重视,但由于木材的短缺和木结构本身的缺陷,组合木结构应时代而生。但木与混凝土交界面上的粘结滑移性能的研究还处于空白。为了考察自然粘结和剪力件作用下木-混凝土试件交界面上的粘结力学性能,根据剪力件的类型的不同和数量的差异、锚固长度大小设计制作了10个木-混凝土短柱试件,其中一个为混凝土与木自然粘结的对比试件,并完成了这些试件的推出试验,采集了数据,并与ABAQUS有限元软件的仿真模拟结果进行了对比,综合分析了木-混凝土的粘结滑移机理、荷载-滑移特征、木材应变分布、剪力件的受力情况等。通过试验与分析得出以下结论：(1)木与混凝土的自然粘结作用由化学胶结力、机械咬合力和摩擦阻力组成,在不同的受力阶段,分别或同时发挥作用。(2)推出试件标准的荷载-滑移曲线大致包括4个阶段：无滑移段、滑移段、破坏段和下降段。(3)在锚固长度和连接件数量的相同的情况下,角钢形式剪力件试件的极限承载力最高,与极限荷载相对应的自由端的滑移最小；斜向螺栓和垂直角度螺栓试件的承载力基本相同,但是斜向对滑移的限制要好于垂直角度螺栓试件。(4)在较低的荷载作用下,有螺栓剪力件和无剪力件面木材沿高度的应变呈指数分布,当荷载增加到一定程度后,无螺栓剪力件的木材侧面的应变呈现出中间附近处的应变最大、两端较小的情况,不再满足指数分布；角钢形式剪力件试件有剪力件面和无剪力件面木材沿高度的应变呈现近似的指数分布。(5)剪力件基本上不起太大的作用,整个试验过程中剪力件变形基本上处于弹性阶段。(6)ABAQUS模拟结果与试验结果吻合较好,即模拟过程中选取的材料模型、单元模型和分析模型是合理的。更多还原

【Abstract】 With the development of economy and the progress of the society, the sustainable development problem and the concept of ecological construction attract people’s attention gradually. Wood, as the only renewable green building materials, has been taken seriously again. Therefore, composite timber structure emerge as required because of the shortage of timber and defects of timber structure. But the study on bond-slip behavior of the interface of wood and concrete is still in the blank.In order to compare natural bonding with bonding mechanical properties of the interface of wood and concrete under the action of shear force, ten short specimens of wood-concrete composite columns have been designed and made according to the types and numbers of shear connecters and anchorage length. The interface of one column used as the contrast specimen is natural bonding between wood and concrete. This paper not only completes push-out test of specimens but also collects the test data, which is compared with simulation results of the analysis of ABAQUS finite element software. This paper also analyzes the bond-slip mechanism between wood and concrete, load-slip characteristics, wood strain distribution, and the force condition of shear connecters. There are the following conclusions through experiments and analysis.(1) Natural bonding between wood and concrete provided by chemical cohesion, mechanical interaction force and frictional resistance works separately or simultaneously in different stages.(2) Standard load-slip curve of the push-out test includes four stages roughly:no sliding period, sliding period, failure period and decline period.(3) In the case of the same anchorage length and the same number of shear connectors, the specimens strengthened with shear connectors of angle steels have the highest ultimate bearing capacity, and the free end slip is minimal under ultimate load. The specimens strengthened with shear connectors of oblique Angle bolts have the same bearing capacity with the specimens strengthened with shear connectors of vertical bolts, but for the limitation to sliding, the former is better than the latter.(4) Under lower load, For the specimens strengthened with shear connectors of bolts, strains of wood on each side present exponential distribution along the height. When the load increases to a certain degree, strains of wood on sides without bolts show large at two poles and little in the middle, no longer meeting the exponential distribution. For the specimens strengthened with shear connectors of angle steels, the strains of wood present approximate exponential distribution along the height.(5) Basically, in the entire test process, shear connectors can not work for specimens and the deformation of shear connectors is in the elastic stage.(6) The simulation results of ABAQUS are in good agreement with the experiment results, that means, material model, unit model and analysis of the model we used in the simulation process are reasonable.更多还原