基于抗剪性能的混凝土桥沥青铺装设计方法

Design Approach of Shear Properties based Asphalt Pavement Structure of Concrete Bridges

摘要:

采用三维有限元方法，对不同混凝土桥型桥面铺装在实测荷载作用下的受力状态进行系统的力学分析，确定不同桥型的临界荷位.从抗剪角度提出进行铺装结构设计时可采用的力学控制指标、桥面铺装层混合料抗剪参数标准以及桥面铺装设计流程，并给出桥面铺装结构组合设计原则或建议.基于此，从铺装层结构设计和材料设计角度提出了七种桥面铺装层结构或材料组合方案，并在申嘉湖高速公路四个混凝土桥梁上铺筑试验段.从目前观测结果看，所有方案均表现出良好的性能.

Abstract:

Stress states of deck pavements of several types of concrete bridges under the action of observed load were analyzed systematically with three dimensional finite element method. Critical load positions of different types of bridges were identified. Then, the design control indexes for paving structure design, shear strength standards for mixture at deck pavement layers and flow chart for deck pavement design were proposed by taking shear properties into consideration, and design principle or recommendation on deck pavement structure combination were provided. Seven options for deck pavement structure or materials combination were proposed from the prospects of structural design and material design, and test sections were conducted on four concrete bridges of Shanghai—Jiading—Huzhou Expressway. Current observation results show that all options perform well.