【作者】 王蕊；

【导师】 武胜；

【作者基本信息】 东北林业大学 ， 结构工程， 2013， 硕士

【摘要】 随着科学的发展,我国钢产量以及需求在逐步的增加,钢结构在我国发展的速度也非常快。钢结构在建筑中比起其他材料有很多的优点,如：强度高,重量轻,结构制作简便,施工工期短等。而随着新型轻钢结构体系应用的迅速发展,冷弯薄壁型钢也趋向于向高强、超薄的方向发展,使冷弯薄壁型钢变得更加轻质、高强。目前,壁厚小于1mm,屈服强度达550MPa的高强冷弯薄壁型钢构件已在很多欧美发达国家,特别是澳洲等发达国家和地区应用在低、多层钢结构建筑结构中。为了研究新型高强冷弯薄壁型钢构件受弯受力性能,本文对17根简支梁进行了试验研究。试件的截面分为DS1和DS2两种截面形式即分别为两大组。每一组再通过分别控制构件的单一变量进行试验,即设定一个标准构件(b=50mm,h=150mm,1=1500mm),然后分别改变试件的高度、宽度以及长度进行试验研究。然后将所得到的实验数据进行整理和对比分析,得出构件的宽度对DS1型构件受力影响不大,对DS2截面构件影响较大,但是构件截面的宽度会影响构件的变形情况,对构件的延性有影响,截面宽度越小构件的延性越好。在相同构件参数条件下,DS1的受弯极限承载力要高于DS2的受弯极限承载力,即DS1的受弯力学性能比DS2的受弯力学性能好。最后用《冷弯薄壁型钢结构技术规范》GB50018-2002提供的方法对两种新型高强冷弯薄壁型钢构件的理论受弯极限荷载进行计算,再与试验受弯极限荷载进行比较。得出对于DS1型截面构件试验受弯极限承载力与理论受弯极限承载力比值基本在1.5-3之间；对于DS2型截面构件试验受弯极限承载力与理论受弯极限承载力比值基本在2-3之间。试件合理高宽比为2～4。更多还原

【Abstract】 Along with the development of science, China’s steel production and demand gradually to increase, the steel structure in China’s development is very fast. In building steel structure has many advantages compared to other materials, such as:high strength, light weight, make simple structure, short construction period, etc. And with the rapid development of new type of light steel structure system application, the cold bending thin-wall steel also tend to be developed to the direction of high strength, ultra-thin, make the cold bending thin-wall steel become more light weight, high strength. At present, the wall thickness is less than1mm, the yield strength of550MPa high strength cold-formed thin-walled steel members have been in many European and American developed countries, especially developed countries such as Australia and regional application in a low and multi-storey steel structure building structure.In order to research new type high strength cold-formed thin-walled steel bearing capacity behavior,17root of simply supported beam is researched in this paper. Cross section of the specimens are divided into DS1and DS2two kinds of section form of the two groups respectively. Each group by respectively, the experiments of single variable control components that set a standard component (b=50mm, h=150mm,1=1500mm), and then change the height, width and length of the specimens were respectively studied.Then sorting and comparison of experimental data analysis, concludes that the width of the component has little effect for the DS1type structure of stress, influence of DS2section components, but the width of the component section affects the deflection of the component, have an effect on the ductility of the member, the smaller width component have the better ductility of the section. Under the condition of the same component parameters, the ultimate bearing capacity of the bending of DS1is higher than that of DS2flexural ultimate bearing capacity, namely the DS1flexural mechanical properties better than DS2flexural mechanical properties.In the end, the<Technical code of cold-formed thin-wall steel structures> GB50018-2002provides methods for two kinds of new type of high-strength cold-formed thin-walled steel members theory limit load calculation of the bending, then comparing with testing flexural limit load. Draw for the ratio of DS1type section component test of the bending theory of ultimate bearing capacity and the ultimate bearing capacity of the bending is basic between1.5～3; The ratio of DS2type section component test of the bending theory of ultimate bearing capacity and the ultimate bearing capacity of the bending is basic between2～3. Reasonable depth-width ratio is2～4specimens.更多还原