摘要
单箱双室箱梁截面能提供更大的桥面宽度,在交通运输不断发展、桥梁通行需求迅猛增长的背景下得到了广泛地应用。桥梁运营过程中,单箱双室箱梁顶板容易出现纵向裂缝病害,对结构技术状况等级和耐久性带来不利影响。结合顶板纵向裂缝现场检查和取芯结果,对裂缝的分布特征和形态特征进行了分析,重点研究了顶板横向预应力钢束的有效度和上浮偏位情况及其对开裂的影响;结合裂缝特征和成因,设计了处治方案并进行了试验应用和效果跟踪观测。研究结果表明,顶板横向预应力上浮将显著降低下缘压应力储备,引起混凝土纵向开裂;针对顶板纵向裂缝,采用高延性防侵蚀涂装方案进行处治可获得良好的效果。
Due to its larger deck width,the single-box double-cell box section has been widely used under the background of continuous development of transportation and rapid growth of bridge traffic demand.In the operation phase,the top slab of single-box double-cell box girder is prone to longitudinal cracks,which affects the technical condition and durability of the structure.In this paper,the distribution and morphological characteristics of the cracks are analyzed based on the results of on-site inspection and coring of the longitudinal cracks in the top slab,and then the effectiveness of the transverse prestressed tendons in the top slab,the floating deviation and the impact on the cracking are studied;combined with the characteristics and causes of the cracks,the treatment scheme is designed and the experimental implementation and effect tracking observation are carried out.The results show that the transverse prestress floating of the top slab will significantly reduce the compressive stress reserve of the lower edge and cause the longitudinal cracking of the concrete;for the longitudinal cracks of the top slab,the high ductility anti-corrosion coating scheme can achieve good results.
作者
王富颉
何厚乐
王灏
WANG Fu-jie;HE Hou-le;WANG Hao(Zhejiang Jiashao River-crossing Bridge Investment and Development Co.Ltd,Shaoxing 312366,China;CCCC Highway Consultants Co.Ltd,Beijing 100010,China)
出处
《公路》
北大核心
2024年第4期118-123,共6页
Highway
关键词
桥梁工程
单箱双室箱梁
纵向裂缝
成因分析
处治对策
bridge engineering
single-box double-cell box girder
longitudinal crack
cause analysis
treatment countermeasures
