冷弯薄壁型钢门式刚架极限承载力影响因素

为研究冷弯薄壁型钢门式刚架极限承载力,提出梁-弹簧单元模拟冷弯薄壁型钢门式刚架节点工作性能和考虑构件初始几何缺陷影响的有限元模拟分析法,研究冷弯薄壁型钢门式刚架在竖向荷载作用下的变形性能及破坏特征。对已有冷弯薄壁型钢门式刚架试验模型进行模拟分析的结果显示,有限元计算结果与试验结果吻合较好。通过改变构件的腹板厚度和翼缘宽度、节点板厚度、刚架梁坡度、柱脚刚度等因素计算刚架极限承载力,计算结果表明,增大前述各个参数值均可以提高冷弯薄壁型钢门式刚架的极限承载力。     

冷弯薄壁型钢门式刚架蒙皮效应研究

采用ANSYS软件对冷弯薄壁型钢门式刚架的蒙皮效应作了探讨性研究.对比分析了无蒙皮门式刚架和有蒙皮门式刚架的顶点竖向位移与柱顶水平位移.计算结果表明,蒙皮效应对刚架整体竖向和水平位移都有很大的限制作用.设计时,可以考虑适当放松按平面刚架计算的刚架柱顶水平位移值,来考虑蒙皮效应.     

冷弯薄壁型钢门式刚架应用现状

本文首先简要介绍了冷弯薄壁型钢门式刚架轻型钢结构体系的特征，然后介绍了具体的工程实例。最后提出了尚有待研究的几个问题，希望能对冷弯薄壁门式刚架的推广和运用起到作用。     

冷弯薄壁型钢门式刚架应用现状

本文首先简要介绍了冷弯薄壁型钢门式刚架轻型钢结构体系的特征,然后介绍了具体的工程实例,最后提出了尚有待研究的几个问题,希望能对冷弯薄壁门式刚架的推广和运用起到作用.     

冷弯薄壁型钢门式刚架结构研究现状与展望

介绍了冷弯薄壁型钢门式刚架的结构形式及特点;指出了目前冷弯薄壁型钢门式刚架结构的研究主要集中在以下两个方面:试验研究和计算机模拟分析.分析评价了国内外在这两个方面的研究成果及其最新进展,同时,也指出了目前研究中存在的问题和今后的研究方向.     

冷弯型门式刚架结构极限承载力有限元分析

对冷弯型门式刚架结构在竖向荷载作用下的变形、极限承载力和破坏特征进行了分析,并验证了该方法的正确性和可靠性,考察了改变节点板尺寸参数对冷弯型门式刚架竖向承载力和刚度的影响,结果表明合理增大节点板尺寸可以有效提高刚架的竖向承载力和刚度。     

大跨度索支承实腹式门式刚架钢结构及其应用

针对普通大跨度实腹式门式刚架随着跨度的增大经济性指标下降的问题 ,提出了索支承实腹式门式刚架结构体系。详细分析了这种结构的受力性能、施工工艺和主要节点构造 ,得出了一些有实用意义的结论和建议     

门式实腹刚架CAD系统PSRFCAD开发

介绍了门式实腹刚架CAD系统PSRFCAD软件，详细阐述了PSRFCAD系统各个组成部分的设计原理及功能，以推广应用该软件，从而促进门式刚架结构的发展。     

大跨度门式刚架结构设计研究

当前,大跨度门式刚架已广泛应用在房屋建筑中,结构设计对工程质量具有直接影响。本文以大跨度门式刚架为例,首先从主体设计、构件整合、关键部位优化等方面分析了门式刚架结构设计内容与方法,其次利用PKSTS软件对门式刚架进行有限元分析,最后结合实际案例,重点阐述门式刚架结构选型与节点连接的要点,以期为相关工程设计提供借鉴。     

Optimum design of cold-formed steel portal frame buildings including joint effects and secondary members

In steel portal frames, cold-formed steel channel sections are increasingly used as the primary framing components, in addition to the secondary members e.g. purlins and side rails. For such framing systems, the stiffness of the joints at the eaves and apex affects the bending moment distribution, as well as the frame deflections. This paper investigates the influence of two joint configurations having full rigidity and semi-rigidity, respectively, on the optimum design of cold-formed steel portal frames. A real-coded genetic algorithm is used to search for the most cost-effective design. It is shown that through incorporating joint effects explicitly into the design process, a more appropriate balance between the joints and the member properties can be obtained, thus optimizing material use. The study then investigates the effect of secondary members on the optimum design. It is shown that incorporating the secondary members is important for portal frames having spans shorter than 12 m. For example, for a frame spacing less than 6 m, the material cost of the primary members can be reduced by up to 15%.     

Design approach of cold-formed steel portal frames

A structural arrangement of a portal frame that is easy to fabricate and assemble is developed. The rafter and column members are formed from single cold-formed channel sections, which are bolted, back-to-back at the eaves and apex joints, and connected to the foundation through angle irons. Variables in the frames include the span, width of the channel flanges and the strength of the channels. The design of the frame members follows the traditional approach of applying the effective width method to control local buckling, followed by an assessment of cross-sectional and buckling requirements. However, the yield and overall buckling requirements are modified by a factor of 0.8 to account for stress concentrations, shear lag and bearing deformations in the connections. All deflections of the frames considered are found to be within the limits provided in the literature and by the two codes of practice. It is proposed that the frames of the structure should be provided in a kit form and erected in “meccano” fashion     

冷弯薄壁型钢建筑体系的墙架结构设计

在用冷弯薄壁型钢构成的建筑中，立柱和底导梁、顶导梁的外面一般用板材来覆盖，组成抗侧力构件，以此来抵抗如风、地震等侧向荷载．本文对冷弯薄壁型钢结构体系中墙架的设计进行了介绍．     

Effect of stressed-skin action on optimal design of cold-formed steel square and rectangular-shaped portal frame buildings

Cold-formed steel (CFS) portal frames can be a viable alternative to conventional hot-rolled steel portal frames. They are commonly used for low-rise commercial, light industrial and agricultural buildings. In this paper, the effect of stressed-skin action on the optimum design of CFS portal frames is investigated by conducting a minimum cost design optimisation on a building of span of 6 m, height-to-eaves of 3 m and frame spacing of 3 m; the effect of different number of bays are considered. For the purpose of this study, it is assumed that gables are rigid.The effect of stressed-skin action is larger for“square-shaped” buildings (i.e. when the span and length are the same on plan) and decreases as more bays are added(i.e. as the building becomes more “rectangular-shaped” on plan). The results of the minimum cost optimisation indicate that if stressed-skin action is taken into account, the cost of the internal frame can be reduced by around half for “square-shaped” buildings. It should be noted that this is a minimum cost optimisation, which is not the same as a minimum weight optimisation. It is also shown that a safe design of internal frames could be obtained by ignoring wind loads (i.e. designing the frame only for gravity loads),but this is limited to buildings having a “square-shape”.     

Research on cold-formed steel columns

The paper summarises research on cold-formed steel columns performed by the author. Cold-formed steel members are either cold-rolled or brake-pressed into structural shapes. As a result, cold-formed steel open sections are usually singly-point- or non-symmetric. The most common types of singly-symmetric sections are channel and angle. The research focused on cold-formed steel open sections, such as plain and lipped channels, channels with simple and complex edge stiffeners as well as plain and lipped angles, and unequal angles. In addition, cold-formed steel built-up closed sections with intermediate stiffeners were investigated. Both experimental and numerical investigations into the strength and behaviour of cold-formed steel columns were conducted. The column strengths obtained from these investigations were compared with the design strengths obtained using various international standards for cold-formed steel structures. Furthermore, the behaviour and design of cold-formed steel lipped channel columns at elevated temperatures were also investigated. The paper also summarises the design recommendations for cold-formed steel columns.     

大吨位吊车门式刚架轻钢结构的设计

简要介绍了门式刚架结构体系及应用范围 ;阐述了大吨位吊车门式刚架轻钢结构的设计方法。提出应主要考虑刚架跨度、柱距及柱高 ,刚架柱截面 ,基础设计等方面 ,强调了设计注意事项。     

轻型钢结构门式刚架的设计

介绍轻型钢架的特点,常用的刚架截面形式及刚架的节点设计等。     

基于ANSYS的门式刚架轻钢结构模态分析

针对门式刚架轻钢结构,基于有限元理论,利用大型有限元分析程序对门式刚架轻钢结构进行三维实体建模和模态分析,得到了此结构的模态分析结果,结果表明当频率较小时,在X方向会产生较大结构破坏位移,而随着外部激振频率的增加,结构破坏位移主要产生在Y方向。