沿河公路钢筋混凝土悬空路面板等效方法研究

发布时间：2018-01-07 02:13

本文关键词：沿河公路钢筋混凝土悬空路面板等效方法研究　出处：《科学技术与工程》2014年35期 　论文类型：期刊论文

【摘要】：弹性模量是钢筋混凝土路面板的重要物理参数,常在数值模拟和力学分析中使用。将钢筋混凝土路面视作复合材料,采用细观力学方法求解其弹性模量,进而等效为均质板。结合裂纹发展规律和钢筋阻裂效应,将钢筋下部混凝土体积分数作为钢筋的体积分数,对传统的混合率模型进行改进。按照骨料含量不同,概化为并串联模型和串联体模型两种等效模式,得出了相应的等效弹性模量预估模型计算公式。对骨料弹性模量和下部钢筋混凝土体积分数进行研究,得出如下结论:1串联体模型计算值在趋势上与实测值符合较好,略大于实测值;2当骨料弹性模量小于60 GPa时,并串联模型计算值小于实测值,且在10%范围内;3当骨料弹性模量大于60 GPa时,并串联模型计算值大于实测值且偏离较大,预估计算公式不再适用;4对于并串联体模型,钢筋体积分数可取(0.1~0.16),对于串联体模型,钢筋体积分数可取0.1以下的正值。
[Abstract]:Elastic modulus is an important physical parameter of reinforced concrete pavement, which is often used in numerical simulation and mechanical analysis. Combined with crack development law and crack resistance effect of steel bar, the volume fraction of concrete in the lower part of steel bar is taken as volume fraction of steel bar, and the traditional mixing rate model is improved according to the content of aggregate. The equivalent models of parallel series model and series model are generalized, and the calculation formulas of equivalent elastic modulus prediction model are obtained. The elastic modulus of aggregate and the volume fraction of lower reinforced concrete are studied. The following conclusions are drawn: the calculated values of the 1: 1 series model are in good agreement with the measured values in the trend, and are slightly larger than the measured values; 2 when the elastic modulus of aggregate is less than 60 GPa, the calculated value of series model is less than the measured value, and it is in the range of 10%; 3 when the elastic modulus of aggregate is more than 60 GPa, and the calculated value of series model is larger than the measured value and deviates greatly, the prediction formula is no longer applicable; 4 for the model of tandem body, the volume fraction of steel bar should be 0.1 ~ 0.16%, and for the model of series body, the volume fraction of steel bar should be less than 0.1 positive value.
【作者单位】：重庆交通大学岩土工程研究所;
【基金】：重庆市“两江学者”计划专项经费(渝委办发[2009]46号) 四川省交通厅科技项目(glkj201227)资助
【分类号】：U416.216
【正文快照】： (渝委办发[2009]46号)、四川省交通厅科技项目(glkj201227)资助截至2012年底,四川、重庆、云南、贵州、西藏等西南部地区公路总里程超过102×104km(四川27.4×104km、重庆11×104km、贵州12.5×104km、云南20.4×104km、甘肃10.6×104km、西藏5.2×104km),约40%路段属于沿河公

【参考文献】