桥台裂缝的温度场效应研究

Temperature Effect of Abutment Crack

以重庆盘溪路大石坝立交工程为例,从温度场理论出发,研究了冬季降温产生的温度应力对如桥台结构的大体积混凝土应力变化的影响;应用有限元软件对桥台背面进行切缝处理,研究切缝后的桥台应力场分布情况。研究结果表明:桥台的外侧受温度影响比内侧受温度影响更为敏感,在降温时候外侧更容易开裂,在桥台背面适当位置增加竖向切缝后,桥台的温度应力集中现象将获得释放。

Taking Chongqing Panxi Road Interchange Project as an example,the effect of temperature stress caused by cooling in winter on the stress change of mass concrete structures of bridge abutment is studied.Abutment back treatment is slit by finite element software and then the stress field distribution of bridge abutment stress is studied.Research results show that the effect of temperature on lateral abutment is more sensitive than the medial one.In the cooling time,the lateral is easier to crack;the increase of vertical slit at abutment back position is in favor of releasing the abutment temperature stress.