哈大客运专线沈阳高铁站弹塑性时程分析

Time-lapse analysis of elasto-plasticity of Shenyang high-speed railway station on Harbin-Dalian passenger dedicated line

以哈大客运专线沈阳站为工程背景,对该结构进行罕遇地震作用下的弹塑性时程分析。通过SAP2000有限元软件研究结构的动力特性、变形状况、基底剪力时程曲线,分析了框架梁、柱的塑性损伤发展历程、拱桁架的塑性铰出铰机制以及关键框架梁、柱构件的塑性损坏状态。结果表明:结构在7度罕遇地震作用下基底剪力与多遇地震下比值最大为5.69;框架梁的损伤比框架柱严重,已进入"极限承载力"状态,仅有少量框架柱进入塑性变形阶段,结构满足"强柱弱梁"的设防要求;关键梁、柱构件损坏程度为79%和68%,仍有较大的富余度。结构薄弱区集中在顶层商业层区域,由于屋面和框架柱的连接效应,柱顶率先出现塑性铰,致使顶层位移角增大。

Shenyang station of the Harbin-Dalian Passenger dedicated Line is taken as the engineering background and the elasto-plastic time history of the structure under the rare earthquake is analyzed.The dynamic characteristics,deformation state and basement shear time-history curve of the structure are analyzed by SAP2000 finite element software.The plastic damage development process of the frame beams and columns,the plastichinge mechanism of the arch trusses and the plastic damage state of the key frame beam and column members is investigated.Results show that the ratio of the base shear force to the multi-incidence earthquake is 5.69 under a 7 degree rare earthquake.The damage of the frame beams is more serious than that of the columns.It has entered the"extreme bearing capacity"state,and only a few frame columns enter the plastic state.The structure satisfies the fortification requirements of"strong columns and weak beams",and the damage degree of key beams and column members is 79%and 68%,and there is still a large margin.The structural weak area is concentrated on the top commercial layer area.Due to the connection effect of the roof and the frame columns,the top of the columns first appears plastic hinge,which results in an increase in the top side shift angle.