摘要
为研究自锚式悬索桥主缆锚固区的应力分布及传力机制,以烟台夹河大桥为例,在桥梁体系转换过程中对锚固区布置测点进行应力监测。随后基于多尺度有限元方法,分别从宏观和局部尺度建立全桥杆系模型和锚固区局部精细模型,依据平截面假定在模型界面处建立控制方程,形成多尺度模型耦合。将关键工况下的测点监测结果与多尺度模型和局部精细模型的计算结果进行对比,并将多尺度模型用于主缆锚固区力学性能分析。结果表明:多尺度模型可有效改善局部模型边界的圣维南效应,与实测值更为相符;锚固区整体以受压为主,主要受力构件纵桥向应力自锚固端向跨中方向呈增大趋势;压重混凝土与钢结构共同受力,使锚固区相应构件的应力分布更加均匀;主缆力首先传递至腹板F1、F2,然后逐步传递至底板,最终各构件受力达到稳定状态。
In order to study the stress distribution and transmission mechanism of the anchorage zone of the main cable of the self-anchored suspension bridge,Yantai Jiahe bridge was taken as an example to monitor the stress measurement point of the anchorage zone arrangement during the bridge system conversion process.Based on the multi-scale finite elements method,the whole bridge rod system model and the local fine model of anchorage zone were established from the macro and local scale respectively,and the control equation was established at the model interface according to the flat cross-sectional assumption,and the multi-scale model coupling was formed.The results show that the multi-scale model effectively improves the Saint-Venant effect of local model boundary,which is more consistent with the measured value.The anchorage zone is mainly under compression,and the longitudinal stress of the main load-bearing member increases from the anchorage end to the mid-span direction.The load bearing concrete and the steel structure bear the force together,making the stress distribution of the corresponding components in the anchorage zone more uniform.The main cable force firstly transfers to the web F1 and F2,and then gradually transfers to the bottom plate,and finally the stress of each component reaches a stable state.
作者
董鹏宇
缪长青
葛付何
DONG Pengyu;MIAO Changqing;GE Fuhe(Key Laboratory of Concrete and Prestressed Concrete Structures(Southeast University),Ministry of Education,Nanjing 211189,China;School of Civil Engineering,Southeast University,Nanjing 211189,China)
出处
《中国科技论文》
CAS
北大核心
2023年第2期131-136,143,共7页
China Sciencepaper
基金
国家自然科学基金资助项目(51778135)。
关键词
多尺度模型
自锚式悬索桥
主缆锚固区
实桥原位监测
multi-scale model
self-anchored suspension bridge
cable anchorage zone
bridge in-situ monitoring
