钢筋混凝土窄梁桥截面转换加固模型试验研究  

Experimental Research of Section Conversion Reinforcement Model of Narrow-beamed Reinforced Concrete Bridge

作　　者：赵晓斌[1] 曹淑上[1] 黄祖林 张由[1] Zhao Xiaobin;Cao Shushang;Huang Zulin;Zhang You

机构地区：[1]重庆市建筑科学研究院,重庆400016 [2]重庆大学土木工程学院,重庆400045

出　　处：《重庆建筑》2018年第12期11-14,共4页Chongqing Architecture

基　　金：重庆市建筑科学研究院科研合作项目"钢筋混凝土窄梁桥长悬臂钢梁拓宽及截面转换加固模型试验研究"

摘　　要：老旧钢筋混凝土桥受当时施工水平限制,多为装配式结构,整体性能差。其中窄梁桥截面形式较为薄弱,随着交通量日益增长,桥梁承载能力和通行能力已明显表现不足。该文依托秀山西门桥加固改造工程,按5:1的相似等效缩尺比例设计制作2组窄梁桥模型,考察增设底板截面转换方式对其受力性能的影响。试验结果表明:增设底板后,同级荷载下试验梁混凝土应力明显减小;开裂荷载和极限荷载明显增大,极限承载力提高71%,结构整体性明显增强,加固增强效果显著。The aging reinforced concrete bridge are mostly fabricated structures with poor integral performance due to the low construction level at that time.The section of narrow-beamed bridges is relatively weak,showing increasingly poor bearing capacity and traffic capacity with the growing of traffic volume.Based on the Ximen Bridge reinforcement and renovation project in Xiushan,two groups of narrow-beamed models are designed and manufactured as the similar equivalent reduced scale of5:1,to investigate the impact of the added baseplate's section conversion method on its mechanical behavior.The test results show that with the baseplate added the concrete stress of the beam sample decreases obviously under the same load;and cracking load and ultimate load increase patently,the ultimate bearing capacity is increased by70%,the structural integrity is enhanced significantly,and the reinforcement effect is remarkable.

关 键 词：秀山西门桥 老旧钢筋混凝土 窄梁桥 增设底板 截面转换 

分 类 号：U443.35[建筑科学—桥梁与隧道工程]