预应力混凝土T梁足尺模型抗弯加固后效果试验  

Experimental on the Full-scale Model Bending ReinforcementEffect of Prestressed Concrete T-beams

作　　者：邓旭东 董谷远航 林帆 冉志红 宋泽冈 DENG Xudong;DONG Guyuanhang;LIN Fan;RAN Zhihong;SONG Zegang(Yunnan Science&Technology Research Institute of Highway,Kunming 650051,China;School of Architecture and Planning,Yunnan University,Kunming 650500,China)

机构地区：[1]云南省公路科学技术研究院,昆明650051 [2]云南大学建筑与规划学院,昆明650500

出　　处：《科技和产业》2024年第19期176-183,共8页Science Technology and Industry

基　　金：云南省交通运输厅科技创新示范项目(2022-48)。

摘　　要：为研究常见加固方式对预应力混凝土T梁足尺模型的加固效果,依托换梁工程,以更换下来的病害T梁作为试验研究对象,使用常用加固方法中的预应力碳纤维板加固、粘贴钢板加固、封缝加固以及体外预应力钢束加固并验证加固效果,对挠度、钢筋应变、裂缝发展情况进行分析。试验结果表明,相较于未加固梁,体外预应力钢束加固效果最突出,开裂荷载提升136%,屈服荷载提升84%,极限荷载提升37%,并且原裂缝基本闭合。由此表明,预应力碳板加固、粘贴钢板加固、体外预应力钢束加固对梁体刚度提升、延缓原裂缝发展、抑制新裂缝产生、承载能力提升等都有较好的效果,而体外预应力钢束加固各方面提升效果最明显。In order to study the reinforcement effect of common reinforcement methods on full-scale models of prestressed concrete T-beams,relied on beam replacement engineering,and taking the replaced diseased T-beams as experimental research objects,common reinforcement methods including prestressed carbon fiber board reinforcement,steel plate bonding reinforcement,joint sealing reinforcement,and external prestressed steel tendon reinforcement were used to verify the reinforcement effect.The deflection,steel strain,and crack development were analyzed.The experimental results show that compared to unreinforced beams,the external prestressed steel strands have the most prominent reinforcement effect,with a 136%increase in cracking load,an 84%increase in yield load,and a 37%increase in ultimate load,and the original cracks are basically closed.This indicates that prestressed carbon plate reinforcement,bonded steel plate reinforcement,and external prestressed steel tendon reinforcement have good effects on improving the stiffness of the beam,delaying the development of original cracks,suppressing the generation of new cracks,and improving the bearing capacity.However,external prestressed steel tendon reinforcement has the most significant improvement effect in all aspects.

关 键 词：桥梁加固 静载试验 足尺模型 加固效果 抗弯性能 

分 类 号：U442[建筑科学—桥梁与隧道工程]