新型竹质工程材料抗震房屋基本构件力学性能.docVIP

新型竹-混凝土组合结构的力学性能研究 作者：程啸林 孙 文 指导老师：魏洋 李国芬 摘要：Pmax提高1.84~2.06倍，对应挠度限值L/250的荷载PL/250关键词：竹结构；竹；；中图分类号：TU375.4 文献标识码：A 文章编号： Mechanical Behavior of Novel Bamboo-Concrete Composite Structures Abstract: A new type of bamboo-concrete composite structures (BCCS) was proposed, which is composed of bamboo and concrete. Concrete and bamboo are connected by connectors. Mechanical behavior of BCCS with dowel type connections have been investigated by testing and analysis. The results indicate that BCCS are subject to some slip at the concrete-bamboo interface and the response of BCCS showed as partially composite structures. The ultimate bearing capacity is achieved with fracture in tension of bottom bamboo fiber. Contrasted to the bamboo beams, ultimate load Pmax enhances 1.84 to 2.06 times, load corresponding to L/250 mid-span deflection of PL/250 increases 3.33 to 3.82 times. The carrying capacity and rigidity has been significantly improved. The mechanical performance of the novel composite beams is between full composite and non-composite, and the composite efficiency can be estimated by the quantity E. In order to reduce or avoid concrete subjected to tensile stresses, the neutral axis of the composite cross section should be located near the bamboo-concrete interface. Key words: Bamboo structures; Bamboo-concrete; Composite structures; Partially composite; Mechanical Performance 0引言 竹材是当前节能环保的生物质绿色材料的重要品种之一，是一种天然有机体，具有强度高、质量轻、可再生和环境友好的特点。[1][3]我国的竹材工业化的水平和规模均居世界领先地位，先后开发了竹编胶合板、竹帘胶合板、竹材材竹材层积材、竹材重组材等多种竹质工程材料，产品品种已经系列化和标准化。[4]江泽慧等[5]对结构用竹集成材物理力学性能进行了研究，竹集成材的水平剪切强度、静曲强度以及弹性模量等力学性能非常优越，水平剪切强度明显优于桉树、马尾松、落叶松、杨木、思茅松等5 种层积材。陈绪和等[6]对竹胶合梁的制造工艺进行了研究，并报道了2004年建成的第一所用竹材制作的云南省屏边小学校舍，该校舍的屋架、屋顶板和内外墙板均为竹集成材和竹胶合板制成，这是竹人造板材首次作为结构材用于建筑，实现了竹材从天然传统建筑材料向现代工程建筑材料的转变，扩大了竹材在建筑领域的应用范围。肖岩等[7][8]研制了装配式竹结构过度安置房，所用的主要材料为竹胶合板，该结构具有施工速度块、保温隔热效果好、造价低廉等优点，适合抗震救灾所需的过渡安置房。李玉顺等[9][10][11]采用梁柱结构体系，实现了竹结构的快速集成装配施工表明竹结构具有优良品质，在近年节能、低碳的背景下，竹结构的发展对于[12]，通过3根竹-混凝土组合结构和1根对比竹梁的抗弯试验，研究了新型竹-混凝土组合结构的力