现行规范对高强复杂加劲冷弯构件力学性能适用性研究  

Applicability Research of the Current Code for Mechanical Behavior of High-Strength Complex-Stiffening Cold-Formed Members

作　　者：武胜[1] 王蕊[2] 

机构地区：[1]东北林业大学土木工程学院,黑龙江哈尔滨150040 [2]齐齐哈尔大学建筑与土木工程学院,黑龙江齐齐哈尔161006

出　　处：《沈阳建筑大学学报（自然科学版）》2015年第3期393-400,共8页Journal of Shenyang Jianzhu University：Natural Science

基　　金：国家自然科学青年基金项目(51008054);中央高校基本科研业务费专项基金(DL13CB10)

摘　　要：目的研究《冷弯薄壁型钢结构技术规范》(GB50018-2002)对G550级高强复杂加劲冷弯薄壁钢材的适用性,提出计算其承载力的修正系数.方法对17根壁厚均为1.1 mm的G550高强钢材进行试验和理论计算,分析高强新型冷弯箱型组合截面受弯构件力学性能.结果无论试验受弯极限承载力或是理论受弯极限承载力,DS1型截面构件均比DS2型截面构件提高近20%;试件的合理高宽比为2~4;对于DS1型截面构件建议不折减,对于DS2型截面构件建议采用0.8的折减系数.结论现行《冷弯薄壁型钢结构技术规范》(GB50018-2002)对G550级高强复杂加劲构件基本适用,对于新型高强冷弯薄壁型钢梁的受弯极限承载力一般情况下要大于规范给出的理论受弯极限承载力.不同的截面构件所适合的折减系数不同,工程设计可根据构件截面的情况决定是否折减.This paper studied the applicability of Chinese code < Technical code of cold-formed thin-wall steel structures > GB50018-2002 for G550 high-strength cold-formed thin-walled steel and proposed correction factors for calculating capacity. Tests of 17 specimens of new-kind G550 high-strength cold-formed thin-walled steel with wall thickness 1.1 mm were carded out and me- chanical behavior of comoosite section under bending moment loading was analyzed. Results show that the limited bending bearing capacity of DS1 section member increases 20% compared with DS2. The reasonable aspect ratios of test specimens are 2 -4. It is recommended that for DS1 type section member, the reduction factor should not be used. But for DS2 type, the reduction factor 0. 8 should be adopted. Conclusion is that the current code GB50018 - 2002 for G550 high strength complex stiffening member is generally applicable. But the flexural carrying capacity of the new kind high-strength cold-formed thin-walled beam is generally higher than the proposed one based on the code. The reduce coefficients for different section members are also different, which should be determined according to the member section type in engineering design.

关 键 词：高强冷弯薄壁型钢 受弯构件 力学性能 适用性 

分 类 号：TU392.1[建筑科学—结构工程]