预制装配式地铁车站单环结构传力与变形机理

Force Transfer and Deformation Mechanism of Single Ring Structure of Prefabricated Subway Station

为了研究新型装配式车站结构的力学与变形性能,以长春某国内首例预制装配式地铁车站为背景,基于有限元软件ABAQUS对装配式地铁车站单环结构拼装成环后传力与变形机理进行研究.首先,建立了不同结构形式与钢丝杠支撑组合的4种工况数值模型;其次,对结构在自重作用下的力学、变形和接头接触性能进行了对比分析;最后,揭示了该类型预制装配式地铁车站单环结构的传力与变形机理.研究结果表明:钢丝杠的支撑作用不容忽视,在拱脚外侧增设水平钢丝杠后,结构最大Mises应力降低约40%,最大主应力降低约80%,最大水平位移降低约90%,拱顶挠度降低约80%,结构内部降剪、降弯效果明显;接头接触状态发生明显变化,除拱顶D-E接头外其余接头接触面挤压面积比例显著增大,拼装结构基本达到了传力稳定可靠、变形安全可控的设计要求,整体自稳能力显著提升.钢丝杠与拼装结构协同工作优化了单环结构的传力路径,有效限制了结构的水平与竖直变形,该类型装配式结构的力学与变形性能优于未设置钢丝杠的现浇结构的对应指标.

In order to study the mechanical and deformation properties of the new prefabricated subway station,took the first prefabricated subway station in Changchun as the background,based on the large-scale general finite element software ABAQUS,the force transfer and deformation mechanism of the single-ring structure of the prefabricated subway station after assembling into a ring were studied.Four numerical models of different structure types and steel bars bracing combination were established.The mechanical,deformation and joint contact surfaces performances of the structure under the action of self-weight were compared and analyzed.The force transfer and deformation mechanism of the type of prefabricated subway station single ring structure were revealed.The results show that the supporting function of steel bars could not be ignored.After added horizontal steel bars to the outside of arch foot,the maximum Mises stress of the structure was reduced by about 40%,the maximum principal stress was reduced by about 80%,the maximum horizontal displacement was reduced by about 90%,and the deflection of the vault was reduced by about 80%,the shear force and bending moment of the structure decreased obviously.The contact state of the joints changed obviously,and the extrusion area ratio of the other joints increased significantly except the D-E joint of the vault,the assembled structure basically met the design requirements of stable and reliable force transmission,safe and controllable deformation,and the overall self-stabilization ability was significantly improved.The cooperative work of steel bars and assembled structure optimized the transmission path of single-ring structure,limited the horizontal and vertical deformation of the structure effectively,the mechanical and deformation performance of this type of fabricated structure was better than the corresponding index of the cast-in-place structure without the steel bar.