摘要
桥面沥青混凝土铺装是桥梁的重要组成部分,对于交通路网通畅运营至关重要,装配化是促进其韧性耐久、绿色低碳、快速智能建造的有效途径。为此,提出了面向未来装配化的新型桥面沥青混凝土铺装结构体系,设计了“梁段+铺装”的一体化复合预制节段及装配连接的接缝构造形式,并对接缝构造关键区域进行了力学优化分析,探究了接缝存在、接缝界面不同黏结状态,以及接缝和预制沥青混凝土铺装不同模量差等因素对装配式桥面沥青混凝土铺装的力学影响。研究结果表明:接缝存在导致铺装上面层最大拉应力增大、下面层最大拉应力减小;接缝界面黏结状态的改善使得接缝和预制下面层边界表面最大拉应力逐渐增大,铺装上面层最大拉应力逐渐减小,直至接缝界面达到完全连续时,两者分别达到最大值和最小值;当接缝材料弹性模量和预制下面层弹性模量接近时,接缝和预制下面层边界表面最大拉应力最小。可见良好的接缝界面黏结状态,以及接缝材料模量与预制铺装材料模量之间的匹配性,对减轻铺装表面开裂可能、平衡上下面层力学状态具有积极作用。建议加强接缝界面黏结,设计或选取与预制沥青混凝土铺装材料模量相近、材料特性相近的接缝填充材料。研究成果对于未来装配式桥面沥青混凝土铺装结构体系设计、预制生产、装配连接,以及桥梁装配化的进一步发展具有重要价值。
The bridge deck asphalt pavement(BDAP)is an important component of bridges and crucial for the smooth operation of transportation road networks.Prefabrication is an effective routine to promote resilience and durability,green and low-carbon materials,and rapid and intelligent construction.To this end,this paper proposes an innovative future prefabrication-oriented BDAP structure system,and designs the integrated composite prefabricated segment of“girder+paving”and the joint structure form of assembly connection.Moreover,a mechanical optimization analysis was conducted on the critical area of the joint structure.The mechanical influences of certain factors on the prefabricated BDAP were investigated,including the existence of joints,different bonding states of the joint interface,and various modulus differences between the joints and prefabricated BDAP.The results show that the existence of joints leads to an increase in the maximum tensile stress in the upper layer of BDAP and a decrease in the maximum tensile stress in the lower layer.The improvement in the bonding state of the joint interface causes the maximum tensile stress on the boundary surface of the lower layer to increase gradually,the maximum tensile stress in the upper layer to decrease gradually,and causes both to reach the maximum and minimum values,respectively,when the joint interface attains complete continuity.When the elastic modulus of the joint material and that of the prefabricated BDAP are similar,the maximum tensile stress on the boundary surface is the smallest.It is evident that good bonding of the joint interface and matching between the modulus of the joint material and that of the prefabricated BDAP material play a positive role in mitigating the possibility of cracking and balancing the mechanical state of the upper and lower layers.Based on the findings of this study,it is recommended to strengthen the interfacial bonding of the joints and design or select joint materials with moduli and material properties similar to those of the prefabricated BDAP materials.The findings of this study are of great value for the design of future prefabricated BDAP structure systems,prefabrication production,assembly connections,and the development of bridge prefabrication processes.
作者
刘刚
钱振东
陈磊磊
陆国阳
NG Shiu-Tong-Thomas
LIU Gang;QIAN Zhen-dong;CHEN Lei-lei;LU Guo-yang;NG Shiu-Tong-Thomas(Department of Civil and Environmental Engineering,University of Wisconsin-Madison,Madison WI 53706,Wisconsin,United States;Intelligent Transportation System Research Center,Southeast University,Nanjing 211189,Jiangsu,China;Department of Architecture and Civil Engineering,City University of Hong Kong,Kowloon 999077,Hong Kong,China)
出处
《中国公路学报》
北大核心
2025年第9期124-133,共10页
China Journal of Highway and Transport
基金
国家自然科学基金项目(52178419)。
关键词
路面工程
桥面沥青混凝土铺装结构体系
未来装配化
复合预制节段
接缝构造
pavement engineering
bridge deck asphalt pavement structure system
future prefabrication
composite prefabricated segment
joint structure
