【作者】 王建娥；

【导师】 徐建新；

【作者基本信息】 河北理工大学 ， 防灾减灾工程及防护工程， 2005， 硕士

【摘要】 在轻型木结构住宅中,楼板和屋顶体系多采用轻型框架木桁架体系,在此体系中桁架节点处常用齿板连接,齿板连接木桁架节点可以提前预制并可以成批制作,这不但节约了劳动力,缩短了施工周期,而且效率高、节点性能稳定可靠,制作简单,齿板连接木桁架在我国推广轻型木结构住宅中是一项值得我们研究的技术,主要介绍了齿板连接轻型框架木桁架的材料、制作、设计、储存、安装和支撑,并在齿板承载力试验的基础上对影响齿板承载力的一些因素进行了分析,为齿板连接轻型框架木桁架的设计验算方法以及此类木桁架的制作、连接以及安装提供一些参考依据。在试验中主要测试了齿板的四个力学性能:板齿极限承载力、齿板的极限受拉承载力、齿板的极限受剪承载力以及板齿的抗滑移承载力。影响板齿承载力的因素有荷载与木纹的夹角,荷载与板轴的夹角、荷载作用时间、木材含水率、木材是否经过阻燃处理、端距和边距、安装方法等,荷载与木纹的夹角对板齿承载力影响较大,而荷载与板轴的夹角对板齿承载力的影响不是很大,另外在选择阻燃处理时应选择对齿板没有腐蚀性的处理方法;影响齿板极限受拉承载力的主要因素有荷载与板轴的夹角以及齿板的外伸长度以及在外伸长度处是否有填块,如齿板在连接节点时有外伸长度,当没有放置填块的外伸齿板处抗拉承载力仅仅是其本身抗拉承载力的23%,影响齿板极限受剪承载力的主要因素有荷载与板轴的夹角、齿板质量和齿板形状,在这次试验中,荷载与板轴交角为60°和120°时,齿板极限受剪承载力可降低55.5%,而且在一些情况中齿板剪力线附近会产生板齿屈服破坏;本文提出净面积和毛面积在计算齿板承载力时换算系数为0.8。更多还原

【Abstract】 The floor and roof framing systems of the wood frame construction are the lightframe wood trusses system, in which there is used by metal plate connection. The metalplate connected wood trusses can be prefabricated in advance ,manufactured in batches andsave labors, lessen construction time, but is efficient and performance of joint is steadily,manufacturing is simple. It is worthy of our research in our country.It introduces materials,manufacturing, design, storage, installation and bracing of the metal plate connected woodtrusses, and analyzes factors which are affected on resistances of truss plate.The four truss plate’s mechanical properties are established through testing of platejoints. To ultimate resistance of teeth, the factors are angle between load and wood grain,angle between load and major axis of plate, loading time, moisture content of wood,whether wood is handled by fire retardant treatment, end and edge instance and installationmethods and so on. In these factors, the effect of angle between load and wood grain isevident, but the effect of angle between load and major axis of plate is smaller. In addition,the selected fire retardant treatment should be not to corrosive to truss plate. The majorfactors which are affected on tensile resistances of truss plate are angle between load andprimary axis of plate and the length of extended plate and whether there are blocking injoints with extended plate. For example, if there are blocking in joint, the tensile resistanceof the extended plate with blocking is 23% of that of plate. The factors which are affectedon shear resistances of truss plate are angle between load and major axis of plate, trussquality and its size. When angle between load and major axis of plate is 60°and120°,shear resistances of truss plate can reduce by 55.5%.In some situations, the plates fail bywithdrawal of the teeth near the shear line after bucking of the plate. The paper advise thatthe conversion factor be 0.8 when we calculate the resistance of plate by gross area method.更多还原