基于SINTAP-FAD方法的含裂纹缺陷钢结构构件安全性评定研究

发布时间：2018-02-10 03:05

本文关键词： 钢结构构件裂纹缺陷断裂力学结构整体性评估程序安全性评定　出处：《工程力学》2017年05期 　论文类型：期刊论文

【摘要】：在施工和运营过程中,钢结构构件上出现的裂纹缺陷可能会扩展而导致其发生断裂破坏,因此对含裂纹缺陷钢结构构件的安全性进行评估具有重要意义。首先,引入断裂力学K_(IC)断裂判据和失效评定图(FAD)概念,并介绍了结构整体性评估程序(SINTAP)的原理;给出了裂纹缺陷评定所需材料参数的确定方法,以及含裂纹缺陷构件的断裂力学参数和塑性屈服荷载的计算方法;然后,提出了基于SINTAP-FAD的含裂纹缺陷钢结构构件的安全性评估流程。最后,以华南和华东两个电厂锅炉钢结构大板梁的焊接缺陷为例,进行了基于K_(IC)断裂判据和SINTAP-FAD的裂纹缺陷安全性评定研究。结果表明,基于SINTAP-FAD的方法为含裂纹缺陷工作的钢结构构件的安全性评估提供了一种行之有效的方法,考虑多裂纹耦合作用的安全性评定方法有待进一步研究。
[Abstract]:In the process of construction and operation, the crack defects on steel structure members may expand and lead to fracture failure, so it is very important to evaluate the safety of steel structure members with cracks. In this paper, the concept of fracture criterion and failure assessment diagram of Kill / IC in fracture mechanics is introduced, and the principle of structural integrity evaluation program SINTAP is introduced, and the method of determining material parameters for crack defect evaluation is given. The fracture mechanics parameters and plastic yield load of cracked steel structures are calculated. Then, the process of safety evaluation of steel structures with cracks based on SINTAP-FAD is proposed. Taking the welding defects of large plate beam of boiler steel structure in two power plants in South China and East China as an example, the safety assessment of crack defects based on SINTAP-FAD and Kill IC-fracture criterion is carried out. The results show that, The method based on SINTAP-FAD provides an effective method for the safety evaluation of steel structure members with crack defects. The safety assessment method considering the coupling effect of multiple cracks needs to be further studied.
【作者单位】：清华大学土木工程系土木工程安全与耐久教育部重点实验室;北京工业大学城市与工程安全减灾教育部重点实验室;东方电气集团东方锅炉股份有限公司;成都益国工程设计顾问有限公司;
【基金】：国家自然科学基金项目(51378289,51678339) 高等学校博士学科点专项科研基金项目(20130002110085)
【分类号】：TU391

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