Q690高性能焊接钢管轴压临界承载力实验研究  

Experimental Investigation on Critical Bearing Capacity of Q690 High Performance Welded Steel Pipe Subjected to Axial Compression

作　　者：方有珍[1] 彭奕亮 杨俊芬[3] 顾强[1] 江涛[1] 蒋鸿云[1] 

机构地区：[1]苏州科技学院土木工程学院,江苏苏州215011 [2]河南省电力勘测设计院,河南郑州450007 [3]西安建筑科技大学土木工程学院,陕西西安710055

出　　处：《实验力学》2014年第3期382-391,共10页Journal of Experimental Mechanics

基　　金：国家电网公司应用科研项目(2010-12);江苏省"青蓝"优秀中青年骨干;江苏省高校首批优秀中青年教师出国研修

摘　　要：为研究国家电网输电塔中Q690高性能钢焊接圆管的临界承载力,取长细比45和60,且考虑径厚比为31.25、37.50和43.75的三种截面,以厚度为8mm的国产Q690高性能钢板设计制作了18根焊接圆管足尺试件并进行轴向受压试验。由试验结果分析表明:试件与普钢圆管发生相同的弹性整体失稳破坏,破坏瞬时突然;而相对普通钢材,Q690高性能钢材料弹性段相对较长,管材环向约束增强,试件失稳相对滞后,临界承载力相应提高。与中国和美国相关行业规范公式计算值对比分析发现:所有规范计算值均不同程度小于试验实测结果,且长细比越大,差异越明显。上述结果进一步验证了将河南省电力勘测设计院"Q690钢管杆塔设计试验研究技术报告"得出的轴压稳定系数取值的相关规范设计公式应用于指导工程设计的可行性。To study the critical bearing capacity of state grid transmission tower made of Q690 high-performance welded circular steel pipes, taking two slenderness ratios 45 and 60 and three cross sections with aspect ratios （D0/t） 31.25. 37. 50 and 43. 75, respectively, 18 full-scale welded pipe specimens were designed and manufactured by using t = 8mm domestic high-performance Q690 steel plate, the axial compression experiments were conducted. Experimental results indicate that elastic overall instability destruction of the specimens is similar to that of common steel pipe, namely, the instantaneous destruction appears suddenly; the elastic segment of Q690 high-performance steel is longer than that of common steel pipe; specimen＇s instability is lagging behind due to stronger lateral restraint of the pipe, which result in the improvement of specimen＇s critical bearing capacity. Comparative analysis of calculated values based on both Chinese specification and American code for transmission tower design reveals that all calculated results obtained from code formulas are smaller than experimental data to different extents; the difference is more obvious with the slenderness ratio increase. Above results further validate that the relevant norms of design formulas based on ＂Technical report of experimental study of Q690 transmission steel pipe tower design＂ written by Henan Electric Power Survey ＆ Design Institute, are feasible for engineering design guidance.

关 键 词：Q690高性能钢 焊接钢管 轴向受压 静力试验 临界承载力 

分 类 号：TU392.3[建筑科学—结构工程]