简支梁桥桥面连续缝受力机理及影响因素研究

Study on Stress Mechanism and Influencing Factors of Continuous Joints on Deck of Simple supported Beam Bridge

将简支梁桥纵向相邻两片板梁及中间的桥面连续缝模拟为一变跨度、变刚度的三跨连续梁,计算其中跨(即桥面连续缝处)的跨中弯矩影响线方程,计算桥面连续缝在活载和支座沉降下的开裂弯矩。将其中一个参数作为变值,其余参数取定值,研究该变值对弯矩值的影响。由此得出桥面连续缝开裂弯矩的影响因素,并据此提出桥面连续缝开裂的改善措施。

The two longitudinal adjacent slab beams and the middle deck continuous joints of a simple-supported beam bridge are simulated as a three-span continuous beam with variable span and varying stiffness to calculate the influential line equation of the moments in the middle span(i.e. at the continuous joints of the bridge deck), and to calculate the cracking moment of the continuous joints on deck in the live load and support settlement. One parameter is taken as a variable value, and the other parameters are taken as the constant values. The article studies the influence of this variable value on the moment value. Therefore, the influence factors of the cracking moment of the continuous joints on deck are obtained. And accordingly the improvement measures for the cracking of continuous joints on deck are proposed.