填充材料对受拉弦杆构件的极限性能影响分析  

作　　者：杨世胜 高岳[2] 周继波 

机构地区：[1]连云港市赣榆区公路事业发展中心,江苏连云港222100 [2]中国人民解放军73049部队,江苏苏州215101 [3]中国人民解放军32136部队,河北张家口075499

出　　处：《科技创新与应用》2023年第34期70-76,共7页Technology Innovation and Application

摘　　要：钢管组合桥梁和抗震韧性结构是近几年工程开发前沿和热点方向。钢管组合结构中,很多管材构件处于受拉状态,提升管材在抗震等极限状态下的力学性能对于提升结构的安全性有重要作用。针对受拉圆管破坏时易横向颈缩的特点,对5种填充工况的薄壁圆管进行单轴拉伸断裂试验,测得不同组别试件的极限抗拉强度、极限伸长量和断裂能。分析结果表明,柔性填充材料对于限制薄壁圆管的横向颈缩有显著作用。管材极限强度最大增幅10.81%,伸长量最大增幅24.56%,断裂能最大增幅35.94%。使用聚氨酯(PU)作为内部填充时,可在重量、成本不显著增加的情况下,使名义极限抗拉强度、伸长量、断裂能最大提升分别为8.12%、18.78%、26.01%。该文结果为改善钢管组合结构在极限状态下的综合表现提供新的技术路径,对于提高结构设计安全性、节约工程建设成本有重要意义。Steel pipe composite bridges and earthquake resistant ductile structures are the frontier and hot direction of engineering development in recent years.In the steel pipe composite structure,many pipe members are in the tensile state,so improving the mechanical properties of the pipe in the seismic and other limit state plays an important role in improving the safety of the structure.According to the characteristics of transverse necking of tensile circular tubes,uniaxial tensile fracture tests of thin-walled circular tubes under five filling conditions were carried out,and the ultimate tensile strength,ultimate elongation and fracture energy of different groups of specimens were measured.The results show that the flexible filling material plays a significant role in limiting the transverse necking of the thin-walled circular tube.The maximum increase of ultimate strength of pipe is 10.81%,the maximum increase of elongation is 24.56%,and the maximum increase of fracture energy is 35.94%.When polyurethane(PU)is used as internal filling,the nominal ultimate tensile strength,elongation and fracture energy can be increased by 8.12%,18.78%and 26.01%respectively without significant increase in weight and cost.The results of this paper provide a new technical path for improving the comprehensive performance of steel pipe composite structures in the limit state,and are of great significance for improving the safety of structural design and saving engineering construction costs.

关 键 词：受拉弦杆 填充材料 断裂试验 极限性能 薄壁圆管 

分 类 号：TU513[建筑科学—建筑技术科学]