N型相贯节点考虑材料损伤累积效应的破坏机理
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摘要
基于有限元软件ABAQUS平台,建立N型相贯节点实体模型,考虑材料损伤累积效应、Bauschinger效应、混合硬化、裂纹萌生等因素,对其在低周往复加载全过程中的破坏机理进行模拟分析。研究表明:主支管相贯部位材料屈服后,随着塑性变形的不断发展,材料内部空洞的增长合并达到一定门槛值时便萌生裂纹,随荷载及循环次数增加,裂纹的不断扩展与合并导致材料在很多晶粒周围形成滑移带并沿着相贯线向冠点处逐渐发展,最后产生沿主管轴向的横向裂缝,与试验结果基本一致。节点刚度在首次屈服至裂纹萌生的阶段退化较快,裂纹发展至破坏阶段退化缓慢。相贯节点因构造复杂,易形成高度应力集中现象,在往复载荷作用下,其危害性更加严重。
Solid model of the tubular N-joint was built on the platform of the finite element program ABAQUS.The failure mechanism of the whole process under low cycle reciprocating loading was studied. The study considers the effect of material damage accumulation,Bauschinger effect,mixed hardening,crack initiation and other factors. The results show that with the continuous development of plastic deformation after the material yielding at the intersecting part of the chord and brace member,cracks were generated when the interior cavity of material reached a certain threshold value,and that with load and cycle times increasing,the material forms slip bands around many grains because of the growing and merging of cracks,then gradually extend along the intersecting line to the crown point,and finally produce transverse cracks along the axial direction of the chord member. The simulation results are basically consistent with the experimental results. The stiffness of the joints deteriorates rapidly in the stage of first yield to crack initiation,and slowly while cracks develop to failure stage. It is prone to form high stress concentration because of complex structure for tubular joint. The harmness is more serious under reciprocating load.
Solid model of the tubular N-joint was built on the platform of the finite element program ABAQUS.The failure mechanism of the whole process under low cycle reciprocating loading was studied. The study considers the effect of material damage accumulation,Bauschinger effect,mixed hardening,crack initiation and other factors. The results show that with the continuous development of plastic deformation after the material yielding at the intersecting part of the chord and brace member,cracks were generated when the interior cavity of material reached a certain threshold value,and that with load and cycle times increasing,the material forms slip bands around many grains because of the growing and merging of cracks,then gradually extend along the intersecting line to the crown point,and finally produce transverse cracks along the axial direction of the chord member. The simulation results are basically consistent with the experimental results. The stiffness of the joints deteriorates rapidly in the stage of first yield to crack initiation,and slowly while cracks develop to failure stage. It is prone to form high stress concentration because of complex structure for tubular joint. The harmness is more serious under reciprocating load.
引文
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8 李晓彤. CFRP加固T型震损圆钢管节点的滞回性能研究[D].青岛:山东科技大学,2017Li Xiaotong. Study on the hysteresis behavior seismic damaged CHS T-joints reinforced with CFRP[D]. Qingdao:Shandong University of Science and Technology,2017
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11 魏科丰,付伟飞. T型圆钢管相贯节点滞回性能研究[J].钢结构,2016,5(31):12-15Wei Kefeng,Fu Weifei. Experimental research of the hysteretic behavior of unstiffened T-type tubular of joint[J]. Steel Construction,2016,5(31):12-15
12 Yin Y,Han Q H,Bai L J,et al. Experimental study on hysteretic behavior of tubular N-joints[J]. Journal of Constructional Steel Research,2009,65(2):326-334
13 刘静.大跨立体拱桁架的累积损伤试验与模拟分析[D].太原:太原理工大学,2015Liu Jing. Cumulative damage experiment and simulation analysis of long-span spatial arch truss[D]. Taiyuan:Taiyuan University of Technology,2015
14 Shen Z Y,Dong B. An experiment-based cumulative damage mechanics model of steel under cyclic loading[J]. Advances in Structural,1997,1(1):39-46
15 石亦平,周玉蓉. ABAQUS有限元分析实例讲解[M].北京:机械工业出版社,2006:364-368Shi Yiping,Zhou Yurong. Explanation of ABAQUS finite element analysis[M]. Beijing:Mechanical Industry Press,2006:364-368
16 李清,郭洋,田策,等.不同角度裂纹缺陷对材料动态断裂行为的影响[J].科学技术与工程,2016,18(28):1-5Li Qing,Guo Yang,Tian Ce,et al. Effect of material crack flaws on dynamic fracture behavior[J]. Science Technology and Engineering,2016,18(28):1-5
17 黄祎丰,裘进浩,郭志强.多裂纹相互作用下断裂行为的边界元分析[J].科学技术与工程,2018,18(8):6-12Huang Yifeng,Qiu Jinhao,Guo Zhiqiang. Boundary element analysis of fracture behavior under the interaction of multi-cracks[J].Science Technology and Engineering,2018,18(28):6-12
2 Gho W M,Yang Y,Gao F. Failure mechanism of tubular CHS joints with complete overlap of braces[J]. Thin-Walled Structures,2006,44(6):655-666
3 梅亮,黄炳生,邵启俊,等. K型足尺相贯节点极限承载力试验研[J].南京工业大学学报(自然科学版),2016,38(1):96-102Mei Liang,Huang Bingsheng,Shao Qijun,et al. Full-scale experiment on ultimate load capacity for K-joints[J]. Journal of Nanjing Technology University(Natural Science Edition),2016,38(1):96-102
4 Lesani M,Bahaari M R,Shokrieh M M. Detail investigation on unstiffened T/Y tubular joints behavior under axial compressive loads[J]. Journal of Constructional Steel Research,2013,80:91-99
5 朱文正,张季超.内置加强板空间相贯节点受力性能研究[J].建筑结构学报,2016,37(4):158-164Zhu Wenzheng, Zhang Jichao. Mechanical behavior research on multi-planar steel tubular joints with inner plate[J]. Journal of Building Structures,2016,37(4):158-164
6 刘静,李海旺,树学峰.循环荷载作用下钢管拱桁架结构滞回性能试验研究[J].建筑结构学报,2014,35(11):94-101Liu Jing,Li Haiwang,Shu Xuefeng. Experimental research on hysteretic property of steel pipe arch truss under cyclic loading[J]. Journal of Building Structure,2014,35(11):94-101
7 李晨,张大长,李布辉.圆钢管T形相贯节点平面内抗弯承载力试验及计算理论研究[J].建筑结构,2017,47(2):23-27Li Chen,Zhang Dachang,Li Buhui. Experimental and calculation theoretical study on in-plane flexural bearing capacity of circular steel tubular T-shaped connection joints[J]. Building Structure,2017,47(2):23-27
8 李晓彤. CFRP加固T型震损圆钢管节点的滞回性能研究[D].青岛:山东科技大学,2017Li Xiaotong. Study on the hysteresis behavior seismic damaged CHS T-joints reinforced with CFRP[D]. Qingdao:Shandong University of Science and Technology,2017
9 李珏飞.空间隔板焊接X型圆钢管相贯节点力学性能研究[D].广州:华南理工大学,2017Yi Yufei. Research on behavior of welded spatial partition plate circular tubular joints[D]. Guangzhou:South China University of Technology,2017
10 袁波,刘远征,宋志丹.加劲肋加强大尺寸焊接方管K型节点滞回性能分析[J].沈阳建筑大学学报(自然科学版),2016,32(5):846-854Yuan Bo,Liu Yuanzheng,Song Zhidan. Analysis of hysteretic behavior of stiffener strengthen large-sized welded square tube K-joints[J]. Journal of Shenyang Jianzhu University(Natural Science Edition),2016,32(5):846-854
11 魏科丰,付伟飞. T型圆钢管相贯节点滞回性能研究[J].钢结构,2016,5(31):12-15Wei Kefeng,Fu Weifei. Experimental research of the hysteretic behavior of unstiffened T-type tubular of joint[J]. Steel Construction,2016,5(31):12-15
12 Yin Y,Han Q H,Bai L J,et al. Experimental study on hysteretic behavior of tubular N-joints[J]. Journal of Constructional Steel Research,2009,65(2):326-334
13 刘静.大跨立体拱桁架的累积损伤试验与模拟分析[D].太原:太原理工大学,2015Liu Jing. Cumulative damage experiment and simulation analysis of long-span spatial arch truss[D]. Taiyuan:Taiyuan University of Technology,2015
14 Shen Z Y,Dong B. An experiment-based cumulative damage mechanics model of steel under cyclic loading[J]. Advances in Structural,1997,1(1):39-46
15 石亦平,周玉蓉. ABAQUS有限元分析实例讲解[M].北京:机械工业出版社,2006:364-368Shi Yiping,Zhou Yurong. Explanation of ABAQUS finite element analysis[M]. Beijing:Mechanical Industry Press,2006:364-368
16 李清,郭洋,田策,等.不同角度裂纹缺陷对材料动态断裂行为的影响[J].科学技术与工程,2016,18(28):1-5Li Qing,Guo Yang,Tian Ce,et al. Effect of material crack flaws on dynamic fracture behavior[J]. Science Technology and Engineering,2016,18(28):1-5
17 黄祎丰,裘进浩,郭志强.多裂纹相互作用下断裂行为的边界元分析[J].科学技术与工程,2018,18(8):6-12Huang Yifeng,Qiu Jinhao,Guo Zhiqiang. Boundary element analysis of fracture behavior under the interaction of multi-cracks[J].Science Technology and Engineering,2018,18(28):6-12