【作者】 肖前慧；

【导师】 于江； 张广泰；

【作者基本信息】 新疆大学 ， 结构工程， 2006， 硕士

【摘要】 端板连接节点是门式刚架轻钢结构中普遍采用的连接形式,由于其构造上的特点,端板连接节点具有非线性性能。目前国内端板连接计算方面还没有设计规范,理论方面仍在探讨研究中,有关的规程对节点的规定主要是传统的设计方法,它对节点的简化和假设不能充分反映端板连接节点的受力性能。我国现行规程关于端板连接承载力的设计计算方法中还没有考虑端板加劲肋对节点承载力的影响,所以,迫切需要对端板连接进行更深入的研究,提出更加合理的设计建议。本文使用通用有限元软件ANSYS 10.0综合考虑了三重非线性(材料非线性、几何非线性以及状态非线性)的影响,同时考虑了螺栓预拉力的影响,对考虑端板厚度、端板加劲肋的设置、螺栓直径、摩擦系数等参数不同的3个系列(端板系列,螺栓直径系列,摩擦系数系列)28个试件进行了有限元数值模拟,对连接节点的性能进行了分析研究。有限元计算结果分析研究的主要结论: (1)有限元模拟的结果表明,几乎所有的梁柱连接的试件在荷载作用下均表现出很好的延性。节点的承载能力主要取决于端板厚度和节点域柱腹板厚度以及细部构造措施,螺栓直径、抗滑移摩擦系数等的影响较小。与普钢结构端板连接中的主要影响因素端板厚度、柱腹板厚度、加劲肋的设置基本一致。(2)在端板厚度相同的试件中,设置加劲肋的作用比增加端板厚度更明显。建议端板加劲肋的厚度取8-12mm,端板加劲肋的高度取梁翼缘到端板伸出处的高度。(3)当端板加劲肋的厚度取8-12mm,端板加劲肋的高度取梁翼缘到端板伸出处的高度,此时考虑端板与加劲肋的共同作用时,端板厚度可取规程计算值的0.9倍,但不宜小于16 mm。(4)单独改变螺栓直径来提高承载能力,使梁柱连接的延性降低,塑性转角减小,而承载能力并没有大的提高。(5)单独改变摩擦系数来提高承载能力,都使梁柱连接的延性降低,塑性转角减小,滑移推迟,而承载能力的提高略小。更多还原

【Abstract】 Recently, with the development of economy and our country’s enhanced in the output and quality of the steel ,gabled frames have been widely used in industrial and civil structures. Bloted end-plate connections are being widely used in gabled frames, because of the geometry complexity of it, the strength models presented in the past few decades can not predict the ultimate strength and distortion of end-plate connection. At the same time there hasn’t existed mature method on the end-plate connection. The standards and specification related can only provide classical design method, most of the assumption do not reflect the actual stress state. The standards don’t considerate the effect when end-plate with rib stiffeners, so it is worthy to research the end-plate in beam-column and some advice on design practice is given as well.Using the general finite element programming package of ANSYS10.0, The study of gabled frames beam-column end-plate connections is made, considering synthetically nonlinear (material, geometry and contact),bolt pretension forces and ratio of axial compression stress to strength. Elastic-plastic finite element analyses are carried out among 28 species of 3 series under monotonic loads,in order to discuss the influence of parameters including stiffness of end-plate, bolt diameter, friction coefficients and so on. The main scopes of this paper include Elastic-plastic finite element analyses are carried out under monotonic load in order to study the similar and the different aspects and reveal organic relationship each other. The main scopes of this paper includes: (1) The species almost have good ductility, the major factors with gabled frames are same as steel structure. (2) Intercalating the rib stiffeners is better than adding the thickness of end-plate, when the thickness of更多还原