温度荷载作用下大跨度桥梁与无砟道岔相互作用研究

Study on the interaction between long span bridge and ballastless turnout under temperature force

将道岔、轨道板、梁体和墩台视为一个相互耦合的系统,建立了计算温度荷载作用下桥梁与无砟道岔相互作用的有限元力学模型。根据变分原理和形成矩阵的"对号入座"法则建立了模型求解的非线性方程组。研究了大跨度桥梁上铺设无砟道岔时,钢轨与墩台温度力与位移的规律。计算结果表明:无砟道岔铺设于大跨度桥梁上时,必须设置钢轨伸缩调节器;无砟道岔铺设于连续梁桥上并设置钢轨伸缩调节器时,岔区内钢轨位移增大;采用连续刚构桥,有利于减小岔区内钢轨位移。

Turnout, slab, beam, pier and abutment were considered as an integrated system. A finite element mechanics model was established which can calculate the interaction between bridge and ballastless turnout under temperature force. The nonlinear equation sets of the model were established according to the variational principle and the ＂set - in - right- position＂ rule for formulating matrix. The law of temperature force and displacement of rail and pier/abutment were studied when ballastless turnout was laid on long span bridge. The numerical examples show that the expansion joint must be installed when ballastless turnout is laid on long span bridge. The displacement of rail increases when ballastless turnout is laid on continuous bridge with the expansion joint being installed. The displacement of rail can decrease if ballastless turnout is laid on continuous frame bridge.