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中文摘要：
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。
英文摘要：
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.
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