板底脱空下BFRP筋连续配筋混凝土路面力学敏感性分析  

Mechanical Sensitivity Analysis of BFRP Reinforced CRCP under Void below Concrete Slab Condition

作　　者：张丽娟[1] 黄建武[1] 许薛军 明恩农 

机构地区：[1]华南理工大学土木与交通学院,广东广州510641 [2]广东省公路管理局,广东广州510075 [3]悉地(苏州)勘察设计顾问有限公司,江苏苏州215123

出　　处：《公路交通科技》2016年第10期32-38,共7页Journal of Highway and Transportation Research and Development

基　　金：广东省交通运输厅科技项目(科技-2013-02-015);广东省公路管理局科研课题(2013-5)

摘　　要：建立了考虑板底脱空及裂缝传荷能力的BFRP筋连续配筋混凝土路面荷载有限元模型,选取混凝土板厚及其弹性模量、基层弹性模量、BFRP筋的弹性模量及其配筋设计,以及地基反应模量等参数,对板底脱空状态下BFRP筋连续配筋混凝土路面板的力学响应及其裂缝传荷能力进行敏感性分析。研究结果表明,增加混凝土板厚可明显改善混凝土板的力学状态,提高混凝土板的模量不能有效改善混凝土板的力学状态;板底脱空区域宽度大时,增大基层弹性模量使混凝土板的受力状态变差;增大BFRP筋的弹性模量及配筋率可以略微改善脱空状态下的混凝土板受力状态和裂缝传荷能力;提高地基反应模量使受荷板板顶最大横向拉应力增大,横向裂缝传荷能力大幅降低,会导致裂缝处的BFRP筋连续配筋混凝土路面板的破坏。A finite element model for simulating traffic loads on continuously reinforced concrete pavement（ CRCP） with basalt fiber reinforced polymer（ BFRP） bars considering void below concrete slab and load transfer efficiency（ LTE） at the transverse cracks of concrete slab is established. Selecting slab thickness and its elasticity modulus,base elasticity modulus,BFRP bars＇ elasticity modulus and its design,and foundation modulus as parameters,the sensitivity analysis of the mechanical response and the LTE at the transverse cracks in BFRP reinforced CRCP slab under void below concrete slab condition is conducted. The result shows that（ 1） the increase of the concrete slab＇s thickness could significantly improve the mechanical condition of the concrete slab,but the increase of concrete＇s elasticity modulus cannot effectively improve the mechanical condition of concrete slab;（ 2） for the case of the wider width of void area below concrete slab,increasing base＇s elasticity modulus may lead the mechanical condition of the slab to worse;（ 3） improving BFRP bars＇ elasticity modulus and its reinforcement percentage could slightly improve the mechanical condition and the LTE at the transverse cracks in the concrete slab under void below concrete slab condition;（ 4） with the increase of foundation response modulus,the maximum lateral tensile stress on the top of the loaded slab increases and LTE at the transverse cracks significantly decreases,which could cause damage of concrete slab near the cracks in BFRP reinforced CRCP.

关 键 词：道路工程 BFRP筋连续配筋混凝土路面 有限元分析 力学敏感性 板底脱空 传荷能力 

分 类 号：U416.216.2[交通运输工程—道路与铁道工程]