子模型在沥青混凝土桥面铺装荷载分析中的应用

Load Analysis on Asphalt Concrete Deck Pavement With Submodel Method

为获得在车辆局部荷载以及桥梁整体变形综合影响下,先简支后连续混凝土T梁桥沥青混凝土铺装层在不同接触条件下弯沉与应力应变的分布规律,建立局部梁段子模型进行分析。分析结果表明:采用子模型计算结果比整体模型小10%,满足精度要求。在连续体系中,受到桥梁横向结构显著影响,弯沉U2由中梁至边梁逐渐增加,边车道应力应变水平大于中车道;边车道荷位处,沥青下面层纵向剪应力S23值较上面层更大,纵向应变ε33随深度增加而递减。在滑移体系中,下面层S23迅速减小,但材料出现较大反向形变;且粘结刚度越大,S23与ε33值越大,受力特征越接近层间连续状态。

In order to get the deflection and stress-stain distribution in the asphalt concrete deck pavement of simply supported-continuous T-beam bridge under the comprehensive effect of local loading and bridge deformation,the partial beam-segment submodel was built. The analyses indicate that the result of submodel is 10% smaller than the whole model which meets the requirement of precision. In the continuous system of deck pavement,U2（ deflection） increases from center to edge beam. And the stress and strain of edge lanes are much higher than the central lanes under the significant effect of transverse structure of bridge. S23（ longitudinal shear stress） in the asphalt lower layer of edge-lanes is much higher than the upper layer. And ε33（ longitudinal strain） of edge-lanes decreases with the increase of depth. In the partial slip system of deck pavement,S23 of lower layer rapid decreases but the great reverse deformation occurs in the material. The higher the bonding stiffness is,the higher S23 and ε33are and more close to continuous system the mechanics characteristics.