地下枢纽车站V型柱结构体系转换模拟分析和监测  

Simulation Analysis and Monitoring of Transformation of V-column Structural System in Underground Hub Station

作　　者：丁加亮 丁慧文 潘建平 范冰 黄中河 严仁章 Ding Jialiang;Ding Huiwen;Pan Jianping;Fan Bing;Huang Zhonghe;Yan Renzhang(China Railway Tunnel Group Sanchu Co.Ltd.,Shenzhen,Guangdong 512205;Department of Civil Engineering,Chongqing Jiaotong University,Chongqing 400000)

机构地区：[1]中铁隧道局三处有限公司,广东深圳512205 [2]重庆交通大学土木工程学院,重庆400000

出　　处：《江西建材》2024年第2期195-200,208,共7页Jiangxi Building Materials

摘　　要：V型柱地下枢纽车站首次被应用于地下空间结构,该结构需经过体系转换,由临时支撑受力转换为V型柱受力。文中通过Midas模拟该结构简化模型模拟体系转换过程,对比两种方案下体系转换过程结构受力状态变化情况,研究体系转换对结构力学行为的影响。结果表明,两种方案下,结构最终受力状态区别很小,分组同步顶升卸载结构受力状态变化更平缓;卸载后,荷载主要传入V型柱,V型柱底部轴力增幅达80%~120%,永久钢管柱轴力增幅仅2%;卸载后,结构跨度变大,V柱与连接V柱的梁弯矩和应力均大幅增加,受卸载影响最大处的负一层梁最大竖向位移和应力增幅分别达到2倍和6.2倍,负一层板竖向位移和应力增幅分别达到3.4倍和4.2倍。对结构体系转换过程进行现场监测,对比结构构件的实测数据与模拟数据,结果显示,关键构件的内力变化规律相似均呈阶梯性增加,同时,监测数据与模拟数据相差较小,验证了数值模拟的正确性。The V-column underground hub station was used for the first time in an underground space structure,which had to be converted from temporary support to V-column forces.The simplified model of the structure was established by Midas to simulate the system conversion process,compare the changes of the structural force state during the system conversion process under the two scenarios,and study the influence of the system conversion on the structural mechanical behavior.The results show the difference between the final force state of the structure under the two schemes is very small,and the change of the force state of the structure is smoother with simultaneous jacking and unloading in groups;After unloading,the load is mainly transferred to the V-shaped column,and the axial force at the bottom of the V-shaped column increases by 80%to 120%,while the axial force of the permanent steel tube column increases by only 2%.After unloading,the span of the structure becomes larger,and the bending moment and stress of the V-column and the beam connected to the V-column increase significantly,and the maximum vertical displacement and stress increase of the negative first floor beam,which is most affected by unloading,reach 2 times and 6.2 times respectively,and the vertical displacement and stress increase of the negative first floor slab reach 3.4 times and 4.2 times respectively.The structural system conversion process is monitored and the measured data of the structural elements are compared with the simulated data.The results show that the internal forces of the key members change in a similar pattern with a step increase,while the difference between the monitoring data and the simulation data is small,which verifies the correctness of the numerical simulation.

关 键 词：V型柱 体系转换 临时支撑 数值模拟 现场监测 

分 类 号：TU398.9[建筑科学—结构工程]