高性能材料桥梁外挂板摩擦耗能节点受力性能试验及分析
Test and Analysis of Stress Performance of Friction Energy Dissipation Nodes of Bridge External Hanging Plate with High Performance Material
赵炯枫 1张阳 2喻满 3李磊4
作者信息
- 1. 湖南大学 土木工程学院,长沙 410082
- 2. 湖南大学 土木工程学院,长沙 410082;风工程与桥梁工程湖南省重点实验室,长沙 410082
- 3. 湖南中路华程桥梁股份科技有限公司,湖南 湘谭 411100
- 4. 林同棪国际工程咨询(中国)有限公司,重庆 401121
- 折叠
摘要
为实现高性能材料外挂板与桥梁主梁的装配式连接,提出一种由螺栓、长圆孔垫片、圆孔垫片、防松垫圈、垫高垫片和角钢组成的新型摩擦耗能节点.设计并开展了新型摩擦耗能节点的推出试验,探究了超高性能混凝土(Ultra-high Performance Concrete,UHPC)、玻璃纤维增强水泥(Glass Fiber Reinforced Concrete,GRC)两种材料外挂板节点在不同方向剪切力作用下的荷载-滑移特征、螺栓滑移路径、极限承载力和破坏模式,并采用数值模拟方法对不同螺栓直径节点的受力性能进行扩大参数分析.试验结果表明:该摩擦耗能节点抗剪破坏形态均为螺栓剪断,螺栓刺入混凝土会造成螺栓孔壁不同程度压碎,GRC挂板螺栓孔壁损坏较严重且有裂缝形成,UHPC挂板仅被螺栓轻微刺入.节点受剪方向对螺栓滑移路径、变形特性以及节点极限承载力有明显影响,沿长螺栓孔短边方向推出抗剪承载力高于沿长边推出;M16螺栓节点抗剪承载力约为螺栓抗拉承载力的72%～87%.数值模拟结果表明:螺栓直径每增大2 mm节点抗剪极限承载力约提升16%,改变UHPC强度对节点抗剪承载力无明显影响,破坏模式均为螺杆受剪断裂.
Abstract
In order to achieve the assembly connection between the high performance material external plate and the main beam of the bridge,a new type of friction energy dissipation node has been proposed,which is composed of bolts,long circular hole washers,circular hole washers,anti-loosening washers,heightening washers,and angle steel.A push-out test was conducted to investigate the load-slip characteristics,bolt slip path,ultimate bearing capacity,and failure modes of the UHPC(Ultra-high Performance Concrete)and GRC(Glass Fiber Reinforced Concrete)external plate nodes under different shear forces and directions.The force performance of nodes with various bolt diameters was analyzed using numerical simulation.The test results show that the friction energy dissipation node primarily fails in shear due to bolt shear fracture,and the penetration of bolts into the concrete leads to varying degrees of crushing of the bolt hole wall.The GRC plate exhibits more severe damage to the bolt hole wall,including the formation of cracks,while the UHPC plate experiences only minor bolt penetration.Moreover,the shear direction significantly influences the bolt slip path,deformation characteristics,and ultimate bearing capacity of the node.Shear bearing capacity is higher along the short side of the long bolt hole compared to the long side.The shear bearing capacity of the M16 bolt node is approximately 72%～87%of its tensile bearing capacity.Furthermore,the numerical simulation results demonstrate that the ultimate shear bearing capacity of the node increases by approximately 16%for every 2 mm increase in bolt diameter.The change in UHPC strength does not significantly affect the shear bearing capacity of the node,and the failure mode consistently involves shear fracture of the bolt.
关键词
桥梁/摩擦耗能节点/试验研究/桥梁外挂板/UHPC/GRC/抗剪性能/推出试验Key words
bridge/friction energy dissipation node/experimental research/bridge external hanging plate/UHPC/GRC/shear resistance performance/push-out test引用本文复制引用
出版年
2024
NETL
NSTL
万方数据