Fatigue behaviors of glulam beams connected with steel splints and bolts

CHEN Aijun, YANG Lei, ZHOU Jianhua, WANG Hang, HE Guojing, WANG Haolei

Journal of Vibration and Shock ›› 2024, Vol. 43 ›› Issue (14) : 243-252.

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PDF(2157 KB)
Journal of Vibration and Shock ›› 2024, Vol. 43 ›› Issue (14) : 243-252.

Fatigue behaviors of glulam beams connected with steel splints and bolts

  • CHEN Aijun, YANG Lei, ZHOU Jianhua, WANG Hang, HE Guojing, WANG Haolei
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Abstract

The glulam beams connected with steel splints and bolts was subjected to cyclic reciprocating dynamic loads in practical engineering applications, which was prone to damage accumulation and component failure.In order to study the fatigue characteristics of the glulam beams connected with steel splints and bolts, the fatigue damage morphology and mechanism of the glulam beams were analyzed, the stiffness degradation law was studied, and the fatigue limit load was explored through the constant amplitude fatigue test at different stress levels and static comparative test.The test results show that the fatigue damage of the glulam beams connected with steel splints and bolts mainly occurs near the loading point.With the increase of the number of fatigue cycles, the mid-span deflection of the glulam beams connected with steel splints and bolts,the tensile and compressive strains along the height of the section increase significantly, the compressive strain increases more than the tensile strain, and the strain distribution basically conforms to the assumption of the plane section.The bending stiffness of the test beam decreases with the increase of the number of fatigue cycles, which basically degrades linearly.The fatigue life of the glulam beams connected with steel splints and bolts decreases with the increase of the stress level. When the stress ratio was 0.2 and the stress level does not exceed 0.5 times the static ultimate load, the fatigue life was greater than 2 million times, indicating that the glulam beams connected with steel splints and bolts have good fatigue properties.In addition, a linear regression analysis of the amplitude of the fatigue load and the fatigue life was performed, and the fatigue ultimate load of 0.5435 Fu was obtained.Finally, the fatigue finite element analysis of the test beam was performed using ANSYS nCode software, and the analysis showed that the software could better simulate the fatigue response of the glulam beams connected with steel splints and bolts under different stress ratios.

Key words

glulam / Steel splint-bolt connection / Fatigue performance / stiffness degradation / Fatigue limit load / Finite element analysis

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CHEN Aijun, YANG Lei, ZHOU Jianhua, WANG Hang, HE Guojing, WANG Haolei. Fatigue behaviors of glulam beams connected with steel splints and bolts[J]. Journal of Vibration and Shock, 2024, 43(14): 243-252

References

[1] 刘伟庆,杨会峰. 现代木结构研究进展[J].建筑结构学报,2019,40(2):16-43. Liu Weiqing, Yang Huifeng. Research progress on modern timber structures[J].Journal of Building Structures,2019,40(02):16-43. [2] 陆伟东,刘伟庆,耿启凡,杨会峰,岳孔.竖嵌CFRP板条层板增强的胶合木梁受弯性能研究[J].建筑结构学报,2014,35(08):151-157. Lu Weidong,Liu Weiqing,Geng Qifan,Yang Huifeng,Yue Kong. Study on flexural behavior of glued laminated timber beams reinforced with vertical CFRP lath inlay[J]. Journal of Building Structures, 2014,35(08):151-157. [3] 龚迎春,武国芳,徐俊华,任海青.日本落叶松正交胶合木抗弯性能研究[J].西北农林科技大学学报(自然科学版),2018,46(11):25-30+38. Gong Yingchun,Wu Guofang,Xu Junhua,Ren Haiqing. Bengding properties of cross-laminated timber fabricated with Larix kaempferi[J]. Journal of Northwest A&F University (Nat. Sci. Ed.), 2018,46(11):25-30+ 38. [4] 潘毅,安仁兵,张春涛,王懿鑫.BFRP布加固圆截面木梁受弯性能试验研究[J].建筑结构学报,2019,40(10):197-206. Pan Yi,An Renbing,Zhang Chuntao,Wang Yixin. Experimental study on flexural behavior of BFRP reinforced circular timber beams [J]. Journal of Building Structures, 2019, 40(10): 197-206. [5] 周先雁,曹磊,曾丹,何朝红.胶合木梁抗弯承载力分析[J].建筑结构,2015,45(22):91-96. Zhou Xianyan, Cao Lei, Zeng Dan, He Chaohong.Flexural capacity analysis of glulam beams[J].Building Structure,2015,45(22):91-96. [6] 陈爱军,彭容新,贺国京,王解军.装配式木结构钢夹板螺栓连接抗剪性能[J].中国公路学报,2018,31(12):59-70. Chen Aijun, Peng Rongxin, He Guojing, Wang Xiejun.Shear Behavior of Bolted Connections with Steel Plate in Assembled Timber Structures[J]. China J.Highw.Transp,2018,31(12):59-70. [7] HANSEN L P. Experimental investigation of fatigue properties of laminated wood beams[C]/ /Proceedings of the 1991 International Timber Engineering Conference. London,UK:[s.n.],1991: 203-210. [8] Madhoushi M, Ansell M P. Experimental study of static and fatigue strengths of pultruded GFRP rods bonded into LVL and glulam[J]. International journal of adhesion and adhesives, 2004, 24(4): 319-325. [9] KYANKA G H. Fatigue properties of wood and wood composites[J]. International Journal of Fracture,1980,16( 6) : 609-616. [10] Chaplain M, Nafa Z, Guenfoud M. Damage of Glulam Beams Under Cyclic Torsion: Experiments and Modelling[M],2009: 349-356. [11] Wu, C.; Zhang, Z.; He, L.; Tam, L.-H. Experimental study on the static and fatigue performances of GFRP-timber bolted connections. Compos. Struct. 2023, 304, 116435. [12] J. Li, J.F. Hunt, S. Gong, Z. Cai, Fatigue behavior of wood-fiber-based tri-axial engineered sandwich composite panels (ESCP), Holzforschung 70(6) (2016) 567-575. [13] Y. Sasaki, A. Oya, M. Yamasaki, Energetic investigation of the fatigue of wood, Holzforschung 68(7) (2014) 843-848. [14] 曹磊,张仲凤,曾丹,贺国京,蔡佳浓.落叶松胶合木梁疲劳性能试验研究[J].建筑结构学报,2016,37(10):27-35. Cao Lei,Zhang Zhongfeng,Zeng Dan,He Guojing,Cai Jianong.Experimental research on fatigue behavior of larch glulam beams[J].Journal of Building Structures,2016,37(10):27-35. [15] 易锦,周煜,张竞峥,冯新,王智丰.胶合木梁变幅疲劳寿命估算试验研究[J].中南林业科技大学学报,2020,40(4):127-132. Yi Jin, Zhou Yu, Zhang Jing Zheng, Feng Xin, Wang Zhifeng. Experimental study on estimation of variable amplitude fatigue life of plywood beams [J]. Journal of Central South University of Forestry & Technology, 2020, 40(4): 127-132. [16]周建华. 钢夹板—螺栓连接胶合木梁疲劳性能试验研究[D].中南林业科技大学,2021. Zhou Jianhua. Experimental study on fatigue performance of glulam beams with steel plywood and bolt connection[D]. Central South University of Forestry Science and Technology,2021. [17]Molina, J.C.; Calil Junior, C.; Carreira, M.R. Pullout strength of axially loaded steel rods bonded in glulam at a 450 angle to the grain. Mater. Res. 2009, 12, 427–432. [18]汪炳,黄侨,刘小玲.组合梁疲劳后的刚度退化规律及计算模型[J].振动与冲击,2021,40(06):265-271. Bing Wang,Qiao Huang,Xiaoling Liu.Stiffness degradation and its calculation model for composite beams after fatigue[J]JOURNAL OF VIBRATION AND SHOCK,2021,40(06):265-271. [19]李廉锟. 结构力学( 上册) [M]. 北京: 高等教育出版社,2004: 296-312. [20] 樊承谋. 木结构基本原理[M]. 北京: 建筑工业出版社,2008: 81-99.
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