摘要
芜湖长江公路二桥引桥首次采用全体外预应力节段预制拼装连续梁桥,为明确结构使用阶段受力性能,进行足尺模型试验研究。试验以“1跨+1/3跨”结构作为足尺模型试验梁,对跨中最大正弯矩、支点最大负弯矩及支点最大扭矩工况下主梁变形、关键截面应力及转向块等构件的受力状态进行分析。结果表明:在使用阶段跨中最大正弯矩、支点最大负弯矩及最大扭转状态下,试验梁各测试断面均未发生开裂,具有良好的抗裂性;结构的应力及变形响应与理论计算值较吻合,处于弹性工作状态且受力状态良好;墩顶横梁及转向块结构使用阶段工作性能良好。
The approach bridge of the Second Wuhu Changjiang River Highway Bridge is a continuous girder bridge,which is the first bridge project that precast girder segments are assembled with full external prestressing.A full-scale model test was conducted to examine the load bearing behavior of the structure in service period,taking a full span plus 1/3 span of the approach bridge as the prototype to build up the model.The main girder deformation,stresses in the key cross sections and the load bearing conditions of the deviators were analyzed,in the load cases of maximum midspan positive bending moment,maximum hogging moment at the supports and the maximum torsional moment at the supports.The results show that no cracks occurred in the tested cross sections of the model under the conditions of maximum midspan positive bending moment,maximum hogging moment at the supports and the maximum torsional state in the service period,proving that the girder has good cracking resistant capacity.The measured stress and deformation responses of the structure agree well with the calculated results,implying that the structure is in elastic working condition and the load bearing condition is good.The pier-top cross beams and deviators can also perform well in the service period.
作者
马祖桥
陈艾荣
胡可
MA Zu-qiao;CHEN Ai-rong;HU Ke(0x09School of Civil Engineering,Tongji University,Shanghai 200092,China;Anhui Transportation Holding Group Co.,Ltd.,Hefei 230088,China)
出处
《桥梁建设》
EI
CSCD
北大核心
2020年第3期39-45,共7页
Bridge Construction
关键词
连续梁桥
节段预制
全体外预应力
足尺模型试验
使用性能
受力状态
continuous girder bridge
segmental precast
full external prestressing
full-scale model test
service performance
load bearing condition