Lv Nao, Zong Qi, Xie Liang, Guo Jian, Guo Shihai, Lu Ziyi, Gao Deling, Xu Haibiao, Wang Hao
School of Civil Engineering and Architecture, Anhui University of Science and Technology, Huainan, 232001, Anhui, China.
ZCCC Road and Bridge Construction Co., Ltd, Hangzhou, 310000, China.
Sci Rep. 2025 Jul 1;15(1):20451. doi: 10.1038/s41598-025-04897-2.
The mechanical properties and energy dissipation evolution of GFRP tube-mortar under dynamic tensile load were investigated based on experiments. The influence of GFRP tube wall thickness and hollow ratio on the peak stress, energy dissipation and failure form of GFRP tube was analyzed by using SHPB test device. The results show that: (1) The dynamic tensile peak stress of GFRP tube-mortar specimens is increased by the restraint protection of GFRP tubes, and the increase of stress is more significant with the tube wall thickness. The presence of hollow ratio will degrade the specimen and reduce its dynamic tensile strength, and the greater the hollow ratio, the more significant the stress reduction of the specimen. (2) Both the wall thickness growth factor and the hollow ratio growth factor are greater than 1, and the increase of the wall thickness and the decrease of the hollow ratio will increase the dynamic tensile strength. The restraint protection of GFRP tube not only enhances the mechanical properties of mortar, but also reduces the weakening of mortar properties caused by internal holes. (3) The presence of GFRP tube significantly reduces the degree of fracture and breakage, and the greater the thickness of the tube wall, the lower the overall degree of fracture and breakage, the stronger the deformation resistance and the higher the stability. The existence of the hollow ratio will produce stress concentration inside the specimen and increase the degree of breakage. (4) The reflection energy and dissipative energy decrease with the increase of GFRP tube wall thickness, and the transmission energy increases with it. The increase of hollow ratio will enhance the energy dissipation effect of the specimen. For mortar concrete buildings, the restraint protection effect of GFRP tubes can greatly improve the dynamic load resistance of the structure, reduce the damage degree of the structure, and improve the safety performance of the building structure. At the same time, reducing the hollow-ratio of the structure itself can enhance the safety performance of the building structure.
基于实验研究了玻璃纤维增强塑料（GFRP）管-砂浆在动态拉伸载荷下的力学性能及能量耗散演化规律。利用霍普金森压杆（SHPB）试验装置，分析了GFRP管壁厚度和空心率对GFRP管峰值应力、能量耗散及破坏形式的影响。结果表明：（1）GFRP管对砂浆试件的动态拉伸峰值应力有约束保护作用，应力增幅随管壁厚度增加更为显著。空心率的存在会使试件性能退化，降低其动态拉伸强度，空心率越大，试件应力降低越显著。（2）壁厚增长系数和空心率增长系数均大于1，壁厚增加和空心率减小会提高动态拉伸强度。GFRP管的约束保护作用不仅增强了砂浆的力学性能，还减小了内部孔洞对砂浆性能的削弱。（3）GFRP管的存在显著降低了破碎程度，管壁厚度越大，整体破碎程度越低，抗变形能力越强，稳定性越高。空心率的存在会在试件内部产生应力集中，增加破碎程度。（4）反射能和耗散能随GFRP管壁厚度增加而减小，透射能则随之增加。空心率的增加会增强试件的能量耗散效果。对于砂浆混凝土建筑，GFRP管的约束保护作用可大大提高结构的动态荷载抵抗能力，降低结构破坏程度，提高建筑结构的安全性能。同时，减小结构本身的空心率可增强建筑结构的安全性能。
