竹-混凝土组合梁的力学性能研究毕业论文.doc

南京林业大学
本科毕业设计(论文)
题目:竹-混凝土组合梁的力学性能研究
学院: 土木工程学院
专业: 土木工程(交通土建工程方向)
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职称: 副教授
二○一二年五月十八日
摘要
在当前发展低碳经济的大背景下,绿色、生态、环保、低碳的新型建筑结构材料是土木工程科技发展的必然方向。竹材最大的优势是绿色环保和原材料可再生,竹材的成材期一般为2~4年,强重比远胜于混凝土等材料,较好的弹性与韧性保证了其具有良好的变形能力。此外,利用竹质工程材料建造的竹结构建筑、桥梁体系也已经得到了实践应用。
本文提出一种竹-混凝土T型组合梁,翼缘板采用混凝土材料,腹板采用竹集成材,两者之间采用剪力连接件以达到共同工作的效用。文章给出了当前国内外有关竹结构的应用和竹结构的前景效益,并对国外木-混凝土组合结构的研究给出简单介绍。
而在试验方面拟采用四根梁式试件和九个剪力键试件。梁式试件其中一根为对比竹梁,其余三根采用三种不同形式的剪力键;九个剪力键试件共分三种,每种三个。根据试验试件的设计尺寸,文章给出了梁式试件的有限元分析,,完全耦合的组合梁在极限承载力方面比对比竹梁可提高接近78%。在200kN同级荷载下,%,说明组合梁相比于对比梁其刚度提升显著,%,可见利用组合结构后两种材料的力学性能起到互补功效。
在组合梁的使用和设计上,本文给出了组合梁基本参数的确定方法,同时就梁式试件方面,给出了竹-混凝土组合梁的抗弯、抗剪以及相关剪力键的抗剪设计理论计算公式以满足设计所需。
关键词:竹材;混凝土;组合梁;力学性能;ANSYS
Abstract
Under a great background of developing low carbon economy, the direction of civil engineering materials must be green, ecological, environmentally-friendly and low carbon. The greatest advantage of bamboo is green, environmentally-friendly and renewable, with a grow period of 2 to 4 years, better strength weight ratio than concrete and good elasticity which could guarantee its deformability. In addition, buildings and bridges made of bamboo structure have been constructed in some projects.
Bamboo-posite beams were proposed in this paper. The presence of a concrete flange linked to the bamboo beam through a connection system allowed a good performance in terms of both strength and stiffness. This paper has shown the use and great prospect of bamboo structure at home and abroad, moreover, the research about timber-posite structure abroad was briefly introduced.
There were four beams and nine shear key specimens in this test. Among four beams, a bamboo beam without concrete flange was different from posite beams which had concrete flanges linked to the bamboo beams and posite beam had a kind of shear key. Three kinds of shear keys were used in the nine shear key specimens and every kind had three specimens. According to the design