火灾下PC箱梁的损伤评估与加固设计
发布时间：2019-01-07 19:11
【摘要】：大嶝大桥第五联桥跨(4×35m预应力混凝土连续箱梁)因火灾受损,火损范围为靠桥台跨12m左右的箱梁底板、腹板和翼缘板。为恢复该桥使用功能,利用超声波检测技术、模态试验方法对桥跨结构混凝土的火损波及范围、深度进行了现场检测试验,同时利用ANSYS有限元软件建立该桥跨三维和二维有限元火损分析模型,进行桥跨火损过程仿真分析,结果表明:有限元仿真识别的损伤范围、深度与现场检测结果吻合良好。在此基础上提出分别对底板、腹板及翼缘板采用粘贴钢板和增设预应力碳纤维板等加固修复措施。加固后桥跨超声波检测、静动载试验结果表明,桥跨结构静、动力性能得以恢复,承载能力达到设计要求。
[Abstract]:The fifth span of Dadeng Bridge (4 脳 35m prestressed concrete continuous box girder) is damaged by fire, and the fire damage range is the bottom plate, web plate and flange plate of the box girder with about 12m span of abutment. In order to restore the function of the bridge, the damage range and depth of the bridge span structure concrete were tested by ultrasonic testing technique and modal test method. At the same time, the ANSYS finite element software is used to establish the three-dimensional and two-dimensional finite element fire loss analysis models of the bridge span, and the simulation analysis of the bridge span fire loss process is carried out. The results show that the damage range and depth of the finite element simulation identification are in good agreement with the field detection results. On this basis, the reinforcement and repair measures of bottom plate, web plate and flange plate are put forward respectively, such as sticking steel plate and adding prestressed carbon fiber plate. The results of static and dynamic load test show that the static and dynamic performance of the bridge span can be restored and the bearing capacity can meet the design requirements.
【作者单位】： 兰州交通大学;铁道第三勘察设计院集团有限公司;中铁上海设计院集团有限公司;
【基金】：国家自然科学基金项目(51368032)~~
【分类号】：U448.213;U445.72
[Abstract]:The fifth span of Dadeng Bridge (4 脳 35m prestressed concrete continuous box girder) is damaged by fire, and the fire damage range is the bottom plate, web plate and flange plate of the box girder with about 12m span of abutment. In order to restore the function of the bridge, the damage range and depth of the bridge span structure concrete were tested by ultrasonic testing technique and modal test method. At the same time, the ANSYS finite element software is used to establish the three-dimensional and two-dimensional finite element fire loss analysis models of the bridge span, and the simulation analysis of the bridge span fire loss process is carried out. The results show that the damage range and depth of the finite element simulation identification are in good agreement with the field detection results. On this basis, the reinforcement and repair measures of bottom plate, web plate and flange plate are put forward respectively, such as sticking steel plate and adding prestressed carbon fiber plate. The results of static and dynamic load test show that the static and dynamic performance of the bridge span can be restored and the bearing capacity can meet the design requirements.
【作者单位】： 兰州交通大学;铁道第三勘察设计院集团有限公司;中铁上海设计院集团有限公司;
【基金】：国家自然科学基金项目(51368032)~~
【分类号】：U448.213;U445.72
【参考文献】
相关期刊论文 前7条
1 时旭东，过镇海;钢筋混凝土结构的温度场[J];工程力学;1996年01期
2 童浩;季晓燕;赵佳军;李捷;郭涛;;先张法预应力空心板火损评定方法及处治对策[J];公路交通科技;2012年03期
3 余天庆,陈开利,彭苗;桥梁结构的损伤现代检测与评估[J];世界桥梁;2004年02期
4 陈淮;邹旭岩;朱俊涛;钱辉;;碳纤维布加固预应力混凝土空心板桥极限承载力全过程分析[J];世界桥梁;2011年01期
5 徐文平;钟华;张宇峰;孙吉飚;;粘钢-体外预应力综合加固T梁的结构特性研究[J];世界桥梁;2011年02期
6 张宏;邵永军;;火灾后混凝土桥梁损伤评估方法与应用[J];四川建筑科学研究;2011年03期
7 张荣利;;广东省某高速公路东莞北特大桥维修与加固[J];世界桥梁;2013年04期
【共引文献】
相关期刊论文 前10条
1 李忠,李耀庄;混凝土构件温度场的数值计算[J];四川建筑科学研究;2005年05期
2 陈育;龚春城;张小英;;火灾下钢筋混凝土结构三维温度场的数值模拟[J];四川建筑科学研究;2010年04期
3 周冬林;，
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