新型冷弯翼缘闭合构件力学性能研究

为进一步利用空翼缘梁截面形式开展,抗弯、扭刚度大的特点,并进一步优化冷弯薄壁型钢构件的截面形式,适当改变空翼缘梁的截面构成参数,提出2种新型冷弯翼缘闭合截面．采用非线性有限元方法分析新型截面构件在轴压、弯矩和压弯荷载作用下的屈曲模式、变形特征、承载力、刚度等方面力学性能．分析表明：新型冷弯截面构件在承受轴压荷载时具有截...     

新型冷弯翼缘闭合组合构件轴压力学性能

为探讨进一步优化使用冷弯薄壁型钢材料,利用冷弯薄壁型钢截面成型灵活的特点,将既有的两类翼缘闭合截面形式经过合理变形,再经组合点焊形成两类新型截面形式——翼缘闭合组合截面DHF1、DHF2.采用ANSYS非线性有限元分析方法,针对新型截面轴压构件,建立了有效的分析模型,通过对构件的应力-应变关系曲线、参数变化时的极限应力变化曲线和应力、变形云图,全面考察了截面高度、截面宽度、板件厚度和闭合区高度比等参数对构件的变形模式、屈曲特征、承载力、极限应力等方面力学性能的影响规律.研究结果表明,新型截面轴压构件板件的局部屈曲不易出现,从而具有截面刚度大、承载能力强的特点,对于中、小长细比构件的极限应力常可达到材料的屈服强度,证明提出的冷弯翼缘闭合新型组合截面轴压构件具有较为优越的力学性能.     

轻钢龙骨结构住宅体系的发展和应用

轻钢龙骨结构住宅体系以其重量轻、抗震好,寿命长、施工快等优良特性,逐渐成为钢结构住宅的一个重要发展方向.从技术和应用两方面介绍了轻钢龙骨结构住宅在国内外发展过程,对比发现我国的轻钢结构住宅技术与欧美,日本等发达国家的先进技术还存在着较大差距。     

新型冷弯翼缘闭合组合构件压弯力学性能

目的 分析冷弯翼缘闭合截面(DHF1、DGF2)构件在压弯荷载作用下的力学性能.方法 采用非线性有限元数值方法,应用大型有限元通用程序ANsYs对新型截面构件的力学性能进行模拟.结果 分析了新型截面构件在压弯荷载作用下的屈曲模式、变形特征、承载力、刚度等方面力学性能,新型冷弯截面构件具有截面平均应力高、相关曲线饱满、构件刚度大、弯曲变形小,板件不易局部屈曲等方面力学性能优势,DHF1、DHF2构件的单位承载力耗钢量最低分别为同截面参数C形构件的46.0%和44.2%.结论 所提出的新型冷弯翼缘闭合构件相关曲线饱满,适宜承受压弯荷载,并且具有多方面优良的力学性能,可以深入研究并合理推广使用.     

中高层钢结构住宅——武汉赛博园小区一期工程

介绍武汉赛博园小区一期工程,该工程为11层钢结构住宅,6.55万m~2,符合经济适用房的现行标准,采用钢框架支撑结构体系,钢柱采用冷弯矩型钢。     

Experimental investigation into the structural behaviour of lapped connections between cold-formed steel Z sections

This paper presents an experimental investigation on the structural behaviour of lapped cold-formed steel Z sections. A total of 26 one point load tests on lapped connections between Z sections with various lap lengths and test spans were carried out, and both the strength and the deformation characteristics of these connections were examined in detail. Among all tests, section failure at the end of lap under combined bending and shear was always found to be critical in the connected Z sections. Moreover, the moment resistances of lapped connections with lap lengths equal to 1.2 times section depth were found to develop only 80% of the moment capacities of connected sections. For lapped connections with lap lengths equal to six times section depth, their moment resistances were found to be significantly increased to about 140% of the moment capacities of connected sections. Similar results in the flexural rigidities of the lapped connections were also found. Consequently, it is shown that the degree of structural continuity in lapped connections against bending depend on not only the load levels, the lap length to section depth ratios, but also the lap length to test span ratios. Hence, the widely adopted assumption of full strength and stiffness connections in lapped sections is not always correct. The research work aims to provide understanding to the structural performance of lapped connections between cold-formed steel Z sections, and hence, to develop a set of rational design rules for multi-span purlin systems with overlaps in modern roof construction. The analysis and design method will be fully presented in a complementary paper.     

截面尺寸对冷弯薄壁槽形钢屈曲的影响

薄壁构件在轴向受压荷载作用下很容易由于屈曲而失效,但是冷弯薄壁型钢构件的屈曲又是一个复杂的过程。在此用有限条法分析了卷边C型截面钢构件的局部屈曲性能,较真实地反映了其受力的实际情况,得出了卷边C型截面钢构件各个截面参数变化对屈曲的影响。     

Fire resistance of cold-formed steel framed shear walls under various fire scenarios

This paper presents results of large-scale experiments with varying levels of fire severity on lateral force-resisting systems commonly used in cold-formed steel framed buildings. Gypsum-sheet steel composite panel sheathed walls, oriented strand board sheathed walls, and steel strap-braced walls are examined. Postflashover fire conditions of two different intensities as well as 1 hour of fire exposure similar to that in a standard furnace qualification test are studied. Additionally, a full-scale furnished kitchen fire experiment is conducted for comparison. The results highlight differences in the thermal response and subsequent performance of the walls as well as differing sensitives of the walls to pre-damage, eg, that might occur during an earthquake. The results are part of a larger effort to provide fragilities for these wall systems in response to realistic fires for performance-based design.     

冷弯薄壁型轻钢结构在建筑扩建应用中的技术解析

冷弯薄壁型轻钢结构已应用于众多建筑工程实践,可适用于低层建筑、局部扩建工程和需要快速搭建的建筑等方面,这种结构还可以尝试在新农村住宅的建造。工业化"制造"轻钢结构,缩短了现场施工工期,减少劳动强度和时间,增加了建造的准确性,提高了建筑的完成度。通过实例解析冷弯薄壁型轻钢结构在建造过程中涉及的各种技术及构造做法,并对冷弯薄壁型轻钢结构进行技术评价,指出这种结构类型优点和不足。     

输电杆塔钢结构技术发展与市场

从输电杆塔钢结构技术发展与市场方面,论述了当前我国输电杆塔的用钢现状、存在的问题和发展趋势,指出随着电网建设的不断发展,输电杆塔对钢材的品种和规格将提出更多的要求,塔材材质方面将向高强度环保型、节约型方向发展,输电杆塔对优质高强的钢材需求量巨大。