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.
关键词
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
Key words
road engineering/continuously reinforced concrete pavement(CRCP)/numerical simulation/load transfer capacity/stress reduction coefficient
维普
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