竹质桥梁构件连接构造研究

发布时间：2018-03-30 17:20

本文选题：重组竹　切入点：力学性能　出处：《重庆交通大学》2014年硕士论文

【摘要】：针对我国丰富的竹材资源，根据可持续发展，节能低碳的原则，，结合桥梁和建筑领域的需求，通过突破强度、刚度、耐久性以及设计和连接等关键技术难题，设计大跨度的竹质工程构件，进行桥梁和房屋的建造，满足社会需要。重组竹材借鉴重组木的制造工艺和原理，是竹材利用上的一个全新起点，重组竹材具有良好的物理力学特性，但是目前将重组竹材运用于一些承重结构中依然较少见，对竹材主要研究和开发内容主要有：一、耐候性高强竹质工程材料加工技术；二、大跨度建筑竹质工程构件设计与制造技术；三、竹质工程材料天然耐腐和防护技术；四、竹质结构房屋设计、建造示范与安全健康性能评价技术；五、竹质工程材料小桥结构设计。竹质桥梁连接构造方式是建造竹质桥梁的基础，通过了解现有钢结构和木结构的相关连接构造形式，提出适用于竹质结构的三种钢构件—螺栓连接构造方式,列举了简支结构、桁架结构、拱式结构中构件的连接，并设计出5种型式竹质材料人行桥。并对材料进行了顺纹力学性能实验，最后采用有限元软件对连接构造设计参数取值进行了计算，分析了连接构造的力学行为及连接构件的破坏形式，主要研究结果归纳如下：（1）胶合重组竹材具有较好的力学性能，得到胶缝的抗剪强度大于胶合竹材的抗剪强度，满足规范要求；在对胶合竹材进行抗拉和抗弯实验中，抗拉试件形状（1）及抗弯试件的第二种加载形式，其受力性能更好；（2）根据螺栓顺纹受力破坏计算条件，得到竹材对称连接中中部和边部构件最小厚度及螺栓端距和中距的最小值，对横向螺栓间距参考木结构设计取值。模型计算中螺栓顺纹最小端距取值满足抗剪强度设计值的要求，与理论计算相符；（3）在竹材构件的抗拉接头中采用外钢夹板连接较为合适、在抗弯接头中采用槽型钢夹板连接较为合适；（4）竹材与竹材连接中改变侧材与主材的相对厚度及螺栓直径，当螺栓直径较大，其破坏形式为中部或边部构件的承压破坏；当螺栓直径较小时，其破坏形式为螺栓弯曲出现塑性铰而达到连接节点的最大承载力。竹材与竹材连接中破坏模式Ⅱ为螺栓弯曲和螺孔的承压破坏，能够充分发挥两种材料的性能。
[Abstract]:For the rich bamboo resources in China, according to sustainable development, low carbon energy principle, combined with the bridge and building areas, breaking through strength, stiffness, durability and key technology of design and connection problems such as bamboo engineering component design of long-span bridge, construction and housing, to meet the needs of the community the recombinant bamboo scrimber and manufacturing process from the principle, is a new starting point of bamboo utilization, has good physical and mechanical properties of Reconstituted Bamboo, but the reconstituted bamboo used in some of the load-bearing structure is still relatively rare at present, there are mainly on the main content: the research and development of bamboo, bamboo engineering of high strength weathering resistance material processing technology; two, the construction of large span bamboo engineering component design and manufacturing technology; three, bamboo engineering materials of natural corrosion and protection technology; four, the bamboo structure building design, construction and demonstration Safety and health performance evaluation technology; five, the design of small bridge structure for bamboo engineering materials.
The bamboo bridge structure is built of bamboo bridge, through the understanding of the relevant connection structure of existing steel structure and wood structure, which is suitable for bamboo structure of three kinds of steel - bolt connection structure, are simple structure, truss structure, arch junction structure components, and design 5 types of bamboo material footbridge. And the materials were along the lines of experimental mechanical properties, use the finite element software for connecting structure design parameters were calculated and analyzed the mechanical behavior of the connection structure and damage form of connection components, the main results are as follows:
(1) recombinant bamboo material has good mechanical properties, obtained shear strength shear strength is greater than the glue laminated bamboo, meet the standard requirements; on glubam of tensile and bending experiments, tensile specimen shape (1) and bending test of second kinds of loading parts, its stress better performance;
(2) according to the longitudinal stress bolt failure calculation conditions, get the symmetric central and edge components of bamboo and the minimum thickness of the bolt connection end distance and the distance of the minimum value, the transverse bolt spacing reference design value of wooden structure. The model calculation of bolt end distance can satisfy the minimum longitudinal shear strength design value requirements in accordance with the theoretical calculation;
(3) it is more appropriate to use the external steel splint to connect the tensile joints of bamboo members, and it is more suitable to use the slot type steel splint in the bending joint.
(4) the bamboo and bamboo in the connection to change the relative thickness and diameter of the bolt material and the material side, when the bolt diameter is larger, the failure form of damage to bearing middle or on the edge of the component; when the bolt diameter is small, the damage in the form of bolt bending plastic hinge and the maximum bearing capacity of joint bearing. Bamboo and bamboo in the connection failure mode II and screw bolt bending failure, can give full play to the performance of the two materials.

【学位授予单位】：重庆交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U441;U448.31

【参考文献】