摘要
为了探究体外预应力束转向块在密集隔板UHPC(ultra-high performance concrete)箱梁桥中的合理构造形式,结合UHPC箱梁隔板的构造特征,提出了UHPC肋块式转向块构造;以广东某拟建UHPC连续箱梁桥为工程背景,通过建立是否借助隔板进行转向的线弹性对比模型,验证了在承受预应力束转向力时UHPC肋块式转向块对腹板应力的控制效果,提出了UHPC肋块式转向块在承受转向力时的5种局部效应;根据计算结果,设计UHPC肋块式转向块足尺试验,观察其裂缝发展、挠度变化以及破坏形态;建立试验全过程非线性有限元模型,对转向块不同配筋方式进行了参数分析,并提出了配筋建议。结果表明:UHPC肋块式转向块抗裂设计名义应力限值可取9.6 MPa;当UHPC耗材0.2 m3时,UHPC肋块式转向块承受体外预应力束转向力达2 004 k N,同时保证了结构的耐久性。
In order to explore the reasonable configuration forms of external prestressed tendon steering block in the UHPC( ultra-high performance concrete) box girder bridge with dense diaphragms,the UHPC rib-shape steering block was proposed on the basis of the structural characteristics of the UHPC box girder diaphragms. On the background of a UHPC continuous box girder bridge proposed to be built in Guangdong Province,the control effect of UHPC rib-shape steering block on web stress under the prestressed tendon steering force was verified by establishing a linear elastic contrast model of whether or not to use diaphragm for steering. 5 kinds of local effects of the UHPC rib-shape steering block subjected to steering force were proposed. According to the calculation results,the full-scale test of UHPC rib-shape steering block was designed to observe the crack development,deflection change and failure mode. The nonlinear finite element model of the whole test process was established. The parameters of different reinforcement methods of the steering block were analyzed,and the reinforcement suggestions were put forward. The whole research results show that the nominal stress limit of UHPC rib-shape steering block with the design of crack resistance is 9. 6 MPa. When the UHPC consumption is 0. 2 m3,the steering force of external prestressed tendon of UHPC rib-shape steering block is up to 2,004 k N,and the durability of the structure is guaranteed.
作者
鲁邦泽
邵旭东
邱明红
周林云
张阳
LU Bangze;SHAO Xudong;QIU Minghong;ZHOU Linyun;ZHANG Yang(College of Civil Engineering,Hunan University,Changsha 410082,Hunan,China;Key Laboratory for Windand Bridge Engineering of Hunan Province,Hunan University,Changsha 410082,Hunan,China)
出处
《重庆交通大学学报（自然科学版）》
CAS
CSCD
北大核心
2020年第1期51-59,66,共10页
Journal of Chongqing Jiaotong University(Natural Science)
基金
国家重点研发计划项目(2018YFC0705400)
湖南省科技重大专项项目(2017SK1010)
国家自然科学基金青年基金项目(51808208)
关键词
桥梁工程
UHPC肋块式转向块
足尺试验
UHPC箱梁
预应力束转向
bridge engineering
UHPC rib-shape steering block
full scale test
UHPC box girder
the steering of prestressed tendon
