低温-动荷载耦合作用下混凝土连续箱梁桥桥面铺装层动态响应

李雄傲¹，王琨^1*，谢丹丹¹，孙星辰¹，姜自玉¹，李洪珍²，冯壮壮²

1.山东交通学院交通土建工程学院，山东 济南  250357；2.山东沂蒙交通发展集团有限公司，山东 临沂  276004

摘要：为解决混凝土连续箱梁桥桥面铺装层常出现开裂、拥包、脱层等病害问题，研究低温-动荷载耦合作用下混凝土连续箱梁桥的桥面铺装层应力与位移分布规律，基于有限元软件COMSOL构建混凝土连续箱梁桥模型，分析桥面铺装受低温环境作用与低温-动荷载耦合作用时的动态力学响应。结果表明：在低温作用下，桥面铺装上面层顶部最大位移为28.75 mm，平均主应力为0.79 MPa；在低温–动荷载耦合作用下，桥面铺装主要受拉应力，桥面铺装上面层拉应力大于下面层，桥面铺装拉应力由荷载中心向荷载边缘增大，桥面铺装最大位移随荷载的增大而增大。

关键词：混凝土桥；桥面铺装；温度-荷载耦合；力学响应

Dynamic response of concrete continuous box girder bridge deck pavement layer under coupled action of low temperature and dynamic load

LI Xiongao¹, WANG Kun^1*, XIE Dandan¹, SUN Xingchen¹, JIANG Ziyu¹, LI Hongzhen², FENG Zhuangzhuang²

1. School of Civil Engineering, Shandong Jiaotong University, Jinan 250357, China;

2. Shandong Yimeng Transportation Development Group Co., Ltd., Linyi 276004, China

Abstract: To address the common issues of cracking, bulging, and delamination in the pavement layer of concrete continuous box girder bridges, the stress and displacement distribution of the pavement layer under low temperature and dynamic load coupling effects are investigated. A concrete continuous box girder bridge model is established using the finite element software COMSOL to analyze the dynamic mechanical response of the pavement layer under low temperature conditions and the coupling effects of low temperature and dynamic loads. The results indicate that under low temperature conditions, the maximum displacement at the top of the pavement layer reaches 28.75 mm, with an average principal stress of 0.79 MPa. Under the coupling effects of low temperature and dynamic loads, the pavement layer primarily experiences tensile stress, with the tensile stress in the upper layer being greater than that in the lower layer. The tensile stress in the pavement layer increases from the center of the load towards the edges, and the maximum displacement of the pavement layer increases with the increase of the load.

Keywords: concrete bridge; bridge deck; temperature-load coupling; mechanical response