| 新型UHPC箱梁桥面体系横向受力性能 |
| |
| 引用本文： | 邵旭东,虢玉标,邱明红.新型UHPC箱梁桥面体系横向受力性能[J].中国公路学报,2018,31(12):144-153. |
| |
| 作者姓名： | 邵旭东 虢玉标 邱明红 |
| |
| 作者单位： | 1. 湖南大学 风工程与桥梁工程湖南省重点实验室, 湖南 长沙 410082;
2. 中国市政工程中南设计研究总院有限公司, 湖北 武汉 430010 |
| |
| 基金项目： | 国家自然科学基金项目（51378194）；湖南省科技重大专项（2017SK1010）；广东省交通运输厅科技项目（2013-02-036）；湖南省研究生科研创新项目（CX2017B119） |
| |
| 摘 要： | 为研究新型UHPC连续箱梁桥面体系的受力特性,以广东清新大桥石角侧跨堤引桥为工程背景进行试设计,建立空间有限元模型进行桥面体系静力计算,以此为基础开展了1∶2缩尺模型试验和非线性有限元模拟,并对影响开裂应力的主要因素进行了参数分析。研究结果表明:UHPC箱梁试设计方案整体计算满足要求,正常使用极限状态桥面体系计算时,纵向未出现拉应力,横隔板上弦板底面最大横向拉应力为11.3 MPa。缩尺模型试验结果表明,桥面体系中横隔板上弦板下缘名义开裂应力为15.4 MPa,极限状态名义应力为68.2 MPa。开裂应力和承载能力均满足工程要求。横向受力抗裂性能参数分析表明,采用法国UHPC结构规范计算名义开裂应力是可行的,增大配筋率整体上可以提高上弦板下缘开裂应力,在实桥中,上弦板下缘钢筋直径建议取值■12～■40。增加上弦板高度可以提高抗裂安全性,当试验模型上弦板高度从24 cm增加到36 cm时,抗裂安全系数从1.24增加到1.52。
|
| 关 键 词： | 桥梁工程 UHPC箱梁桥 试验研究 横向受力 桥面体系 |
| 收稿时间： | 2018-06-03 |
Transversal Mechanical Behavior of a Deck System in a New Type of UHPC Box Girder Bridge |
| |
| SHAO Xu-dong,GUO Yu-biao,QIU Ming-hong.Transversal Mechanical Behavior of a Deck System in a New Type of UHPC Box Girder Bridge[J].China Journal of Highway and Transport,2018,31(12):144-153. |
| |
| Authors: | SHAO Xu-dong GUO Yu-biao QIU Ming-hong |
| |
| Affiliation: | 1. Key Laboratory for Wind and Bridge Engineering of Hunan Province, Hunan University, Changsha 410082, Hunan, China;
2. Central and Southern China Municipal Engineering Design & Research Institute Co., Ltd., Wuhan 430010, Hubei, China |
| |
| Abstract: | A trial design of an ultra-high performance concrete (UHPC) box girder was conducted to investigate the mechanical behavior of a deck system on a new UHPC continuous box-girder bridge. The study was based on the cross embankment of the Shi-jiao side of the Qing-xin Bridge, Guangdong Province. First, a finite element model was built for static analysis of the bridge deck system. Then, a 1:2 scale model test and nonlinear finite element simulation were conducted. In addition, the affecting factors of the cracking stress were analyzed. The results show that the calculation of the entire trial design meets the requirements of the bearing load. No tensile stress is found along the longitude of the bridge deck system in serviceability limit states. The maximum transversal tensile stress at the bottom of the upper plate of the diaphragm is 11.3 MPa. The test results of the scale model show that the nominal cracking stress at the bottom of the upper plate of the diaphragm is 15.4 MPa, and the nominal stress of the limit state is 68.2 MPa. The cracking stress and bearing capacity both meet engineering requirements. The parameter analysis of the transversal crack resistance indicates that using the French UHPC structural code to calculate the nominal cracking stress is feasible. The cracking stress at the bottom of the upper plate can be improved by increasing the reinforcement ratio. In an actual bridge, the diameter of the steel bar at the bottom of the upper plate is recommended to be between  12 and 40. Increasing the upper plate height can improve the anti-crack safety. When the upper plate height of the experimental model is increased from 24 to 36 cm, the safety factor increases from 1.24 to 1.52. |
| |
| Keywords: | bridge engineering UHPC box girder experimental research transversal mechanical behavior bridge deck system |
| 本文献已被 CNKI 等数据库收录！ |
| 点击此处可从《中国公路学报》浏览原始摘要信息 |
|
点击此处可从《中国公路学报》下载全文 |
|
