钢材缺陷及焊接对Z向性能的影响分析  

EFFECTS OF MATERIAL DEFECT AND WELDING ON Z-DIRECTION PROPERTIES ON STRUCTURE STEEL

作　　者：王元清[1] 张元元[1] 石永久[1] 

机构地区：[1]土木工程安全与耐久教育部重点实验室,清华大学土木工程系,北京100084

出　　处：《低温建筑技术》2013年第7期1-4,共4页Low Temperature Architecture Technology

基　　金：国家自然科学基金资助项目(50778102)

摘　　要：对于钢材的Z向性能,最广泛而直接的影响是产生层状撕裂破坏。Z向性能不足导致的层状撕裂在钢结构建筑体型越来越大,厚板应用越来越多的情况下更加普遍。为了研究Z向性能的影响机理,文中着重分析了钢材自身缺陷、焊接的不利影响、厚板及连接的拘束作用及Z向残余应力的影响。有以下结论:Z向层状撕裂实际是焊接时基体金属在Z向应力下沿夹杂物与基体金属界面开裂和扩展的过程。在钢材材质及缺陷,焊接工艺及方法上进行优良的改进可以大大避免Z向破坏的发生。For Z-direction properties of structure steel, the most common and direct influence is la- mellar tearing. LameUar tearing from deficiency of Z-direction properties will be much more prevalent during much more huge buildings using more thick plates. To make clear the mechanism how material defeet and welding affect Z-direction properties, defects of steel, detrimental of welding to thick steel, constrain of joint and the residual stress were analyzed. The conclusion is as follows, lamellar tearing is a process in which base metal cracks and flaw stretches along the interface between base metal and inclusions under Z-direction stress;With properties of steel and the welding method being improved lamellar tearing can be avoid.

关 键 词：钢结构 缺陷 焊接 厚板 Z向性能 层状撕裂 

分 类 号：TU391[建筑科学—结构工程]