【作者】 王美；

【导师】 傅学怡；

【作者基本信息】 哈尔滨工业大学 ， 土木工程， 2010， 硕士

【摘要】 随着钢结构的发展,越来越多的建筑物使用钢结构,而构件中的梁柱尺寸也越来越大,这样在梁柱连接处会形成一个较大的节点域,由于梁柱的约束作用,此节点域刚度相对于梁或柱刚度较大,因此梁或柱的有效长度有所减小,相当于在节点域内沿梁或柱有一段刚度无穷大的区域,称之为刚域。目前结构分析软件中大多采用杆系模型来模拟实际结构,在杆系模型中,节点刚域长度的取值将影响杆件的有效长度,从而影响到整个结构的刚度,而结构刚度对于结构的振动响应影响很大,因此要准确计算结构的地震响应,前提是要准确计算结构的实际刚度,也就是要准确设置节点刚域的长度。目前对钢框架节点的研究基本都集中在节点域和节点承载力方面,对节点刚域方面很少涉及,因此有必要对钢框架节点刚域进行研究。本文采用通用有限元分析软件ANSYS,对钢框架全焊接节点建立实体模型,给出了模拟分析刚域长度的方法和算例,并对该方法计算出的刚域系数进行了ANSYS实体框架模型和SAP2000线模型设定刚域系数的对比,框架在水平荷载作用下的最大侧移吻合较好,证明了这种分析刚域长度方法的有效性。对“╋”型和“┣”型节点进行了影响节点刚域长度的多参数分析,参数包括梁柱截面尺寸、加劲肋尺寸以及梁跨度和柱层高。计算分析表明,节点域腹板厚度、梁截面高度、柱截面高度是影响刚域系数的主要原因,梁柱其它截面尺寸只对自身刚域影响较大,加劲肋尺寸只对梁的刚域影响较为明显,对柱子刚域,几乎没有影响。最后通过节点域变形对所有参数的影响趋势进行了分析。更多还原

【Abstract】 With the development of steel structure, more and more buildings use steel structure, and the sizes of the beams and columns are also larger, so at the joints will form a large panel zone. As constraints of the beam and column, stiffness of the panel zone is very large relative to beam stiffness or column stiffness. Therefore, the effective length of the beam or column will be reduced, which is equivalent to a region with infinite stiffness known as rigid-zone exists along the beams or columns. In structural analysis software, mostly use the line-element model to simplify and abstract the actual structure, length of the rigid-zone affects the effective length of the beam or column, thus affects the stiffness of the entire structure, while the structural stiffness has a great influence on the vibration response of the structure, so to accurately calculate the seismic response, the premise is to calculate the actual stiffness of the structure accurately, which is to set the rigid region accurately, too.Current researches on the steel frame joints are concentrated in the panel zone of the beam-column joints and the load carrying capacity, not involve the rigid region, so it is essential to research the rigid region of the joints.In this paper, the solid model of all-welded steel frame is constructed by the finite element analysis software ANSYS, then give the simulation analysis method and example of the rigid-zone factor, and compare the deformations of ANSYS solid model with SAP2000 line-element model which has set the rigid-zone factor, the top horizontal displacement of the frame shows good agreement and proves the method is an effective method.Parameters affecting the rigid-zone factor of joints of―╋‖type and―┣‖type have been analyzed, these parameters include the beam and column section sizes, the continuity plate size, the beam span and the storey height. Calculation and analysis show that the thickness of column web, the beam depth, the column depth is the main factor affecting the rigid-zone factor, the other sizes of beam and column has impact only on their own rigid-zone factor, the continuity plate size has obvious impact only on the rigid-zone factor of beam, little impact on the column. Finally, the influence trends of all the parameters are analyzed through the deformation of the panel zone.更多还原