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在役连续配筋混凝土路面横向裂缝传荷能力评价新方法

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通过建立带横向裂缝的连接配筋混凝路面(CRCP)结构仿真模型,计算CRC板在不同挠度传荷系数(LTE)下的最大应力,对比CRC板最大应力的有限元解和基于实测LTE的应力计算值,从理论上分析以挠度传荷系数作为CRCP横向裂缝评价指标的适用性,并提出用于在役CRCP横向裂缝传荷能力的计算与评价新方法.研究结果表明:采用常用的挠度传荷系数(LTE)评价CRCP横向裂缝传荷能力不科学且结果偏保守;基于CRCP横向裂缝处板底水平应力动力响应分析,引入应力折减系数(SRC)来表征横向裂缝的传荷能力,以解决用LTE来评价CRCP横向裂缝传荷能力结果偏保守的问题,并提出以SRC为25%作为传荷能力强的临界值.CRCP板底最大水平应力随板厚增加不断减少,板厚变化对SRC影响显著,对横向裂缝传荷能力评价时需考虑板厚的影响;通过非线性回归建立考虑CRCP板厚的LTE与SRC换算公式,实现基于实测挠度采用SRC评价不同板厚下CRCP横向裂缝传荷能力的目的;运用提出的评价新方法评价CRCP实体工程横向裂缝传荷能力,评价结果基本符合实体工程的实际服役能力,解决了原有评价方法结果过于保守的问题,可为CRCP养护决策提供依据,实现对CRCP横向裂缝的精准控制.
A new method for evaluating load transfer capacity of transverse crack of continuously reinforced concrete pavement in service
A simulation model of CRCP with transverse cracks was established to calculate the maximum stress in CRC slab under different deflection load transfer coefficients(LTE).The finite element solution of maximum stress in CRC slab was compared with stress calculation values based on measured LTE,aiming to theoretically analyze the applicability of using LTE as an evaluation indicator for transverse cracks in CRCP.Additionally,a new method for calculating and evaluating the load transfer capacity of transverse cracks in in-service CRCP was proposed.The results show that applying the LTE to evaluate the load transfer capacity of transverse cracks in CRCP is not scientifically justified and it tends to yield conservative results.This conclusion is drawn based on the comparison of the measured deflection data from field tests and the theoretical analysis of maximum stress in panels.To address this issue,a stress reduction coefficient(SRC)is proposed to characterize the load transfer capacity at the location of transverse cracks.The horizontal stress dynamic response analysis under the slab with transverse cracks supports the introduction of the SRC.Furthermore,it is suggested that SRC of 25% can be used as the critical threshold to assess great load transfer capacity.The maximum horizontal stress under the CRC slab decreases as the thickness increases.The variation in CRC slab thickness significantly affects SRC,and therefore the evaluation of the load transfer capacity of transverse cracks should consider the influence of CRC slab thickness.A conversion formula between LTE and SRC is established through nonlinear regression analysis taking into account the thickness of CRCP.This formula enables the evaluation of the load transfer capacity of transverse cracks in CRCP with different plate thicknesses using SRC based on measured deflection data.The newly proposed method is applied to assess the load transfer capacity of transverse cracks in practical CRCP structures.The evaluation results align well with the actual service capacity of the concrete pavement,resolving the issue of over-conservatism in the previous evaluation methods.This approach provides a basis for maintenance decision-making in CRCP to facilitate accurate control of transverse cracks in CRCP.

road engineeringcontinuously reinforced concrete pavement(CRCP)numerical simulationload transfer capacitystress reduction coefficient

李盛、余时清、孙煜、王阳

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长沙理工大学特殊环境道路工程湖南省重点实验室,湖南长沙,410114

中冶南方城市建设工程技术有限公司,湖北武汉,430063

道路工程 连续配筋混凝土路面 数值模拟 传荷能力 应力折减系数

国家重点研发计划项目国家自然科学基金资助项目湖南省交通运输厅科技进步与创新计划项目湖南省自然科学基金资助项目

2021YFB2601000523784362022352022JJ30598

2024

10.11817/j.issn.1672-7207.2024.02.025

中南大学学报(自然科学版)
中南大学

中南大学学报(自然科学版)

CSTPCD北大核心
影响因子：0.938
ISSN：1672-7207
年,卷(期)：2024.55(2)
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