温度和粗糙度对混凝土桥面铺装层间剪切强度的影响研究

Effect of temperature and roughness on interlayer shear strength of concrete bridge deck pavement

为探究温度和粗糙度对混凝土桥面铺装层间剪切强度的影响规律.在室内剪切试验中,采用摩擦系数、构造深度、2D/3D灰度值表征混凝土板粗糙度;并测量剪切试件的层间剪切强度.对粗糙度与层间剪切强度的关系进行灰色关联分析后,基于主成分回归法分析温度、粗糙度对层间剪切强度的影响规律.发现摩擦系数、构造深度变化对层间剪切强度的影响较大;灰度值变化对层间剪切强度的影响较小.从温度、粗糙度与层间剪切强度的非线性回归模型可知:相较于粗糙度变化,温度变化对层间剪切强度的影响更大,层间剪切强度随温度的升高而减小.

The paper exploring the influence of temperature and roughness on interlayer shear strength of concrete bridge deck pavement.In the indoor shear test,the roughness of concrete slab is characterized by friction coefficient,structure depth and 2D/3D gray value,and the interlayer shear strength of shear specimens is measured.After grey correlation analysis of the relationship between roughness and interlayer shear strength,the influence of temperature and roughness on interlayer shear strength was analyzed based on principal component regression method.It is found that the variation of friction coefficient and structural depth has a greater impact on interlayer shear strength,while the variation of gray value has a smaller impact on interlayer shear strength.From the non-linear regression model of temperature,roughness and interlayer shear strength,it can be seen that compared with the change of roughness,the influence of temperature on interlayer shear strength is greater,and the interlayer shear strength decreases with the increase of temperature.