TEMPERATURE PREDICTION OF ASPHALT CONCRETE AND CORRECTION OF DEFLECTION ON BRIDGE SLABS FOR FWD TESTING
TEMPERATURE PREDICTION OF ASPHALT CONCRETE AND CORRECTION OF DEFLECTION ON BRIDGE SLABS FOR FWD TESTING
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DOI：
10.2208/journalofjsce.9.1_148
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发表时间：
2021
期刊：
影响因子：
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通讯作者：
H. Higashiyama;M. Tsukamoto;H. Mashito
中科院分区：
文献类型：
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作者：
H. Higashiyama;M. Tsukamoto;H. Mashito
通过落锤式弯沉仪（FWD）试验，研究了利用加载点和综合弯沉区的弯沉对梁支承的钢筋混凝土（RC）板的完好性评价。在FWD试验中，沥青混凝土层在冲击荷载作用下在加载点附近局部变形。钢筋混凝土板的挠度，因此，需要确定一个适当的修正方法。本研究提出一个公式，以确定沥青混凝土层的平均温度，采用回归分析与实测结果。结果表明，所提出的公式可以准确地预测平均温度，通过将一个小时的差异，在沥青混凝土表面的温度。此外，分析验证了在FWD测试过程中提出的平均温度的挠度修正方法的沥青混凝土层的温度梯度在整个深度。温度梯度对挠度修正的影响较小，提出的修正方法适用于FWD试验中钢筋混凝土板的挠度修正。
The authors have investigated the soundness evaluation of existing reinforced concrete (RC) slabs supported by girders using deflection at a loading point and an integrated deflection area through falling weight deflectometer (FWD) tests. In FWD tests, an asphalt concrete layer deforms locally around a loading point under an impact load. The deflection of RC slabs thus needs to be determined with an appropriate correction method. This study proposes an equation to determine the average temperature of asphalt concrete layer using a regression analysis with measured results. The results show that the proposed equation can accurately predict the average temperature by incorporating a one-hour difference in asphalt concrete surface temperature. Furthermore, the correction method of deflection using the average temperature during FWD tests proposed was analytically verified for asphalt concrete layers with temperature gradients throughout the depth. The influence of temperature gradients in correcting the deflection was also noted to be small and the previously proposed correction method was applicable to determine the deflection of RC slabs in FWD tests.