地铁车站密肋空心板受力特性研究
Research on mechanical characteristics of ribbed hollow slab in metro station
高升1
作者信息
- 1. 陕西省铁道及地下交通工程重点实验室,陕西西安 710043;中铁第一勘察设计院集团有限公司,陕西西安 710043
- 折叠
摘要
结合建筑结构中密肋空心板结构形式及理论方法,在地铁车站主体结构设计中引入密肋空心板结构.采用有限元软件ANSYS,分析了不同空心率时顶板和中上板抗弯、抗剪、裂缝宽度及抗浮四方面的受力性能,得到了弯矩、抗剪安全系数、裂缝宽度和抗浮安全水位随空心率的变化规律.结果表明:当空心率在规范要求范围内增大时,方案S1和S2下空心板弯矩、抗剪安全系数、裂缝宽度和抗浮安全水位均减小;其中,空心率变化对边墙附近截面弯矩影响最大,对柱子截面处弯矩影响最小,纵向肋间距较横向肋间距对抗剪安全系数有更大的影响,裂缝宽度在跨中截面处减小最突出,方案S2较方案S1抗浮安全水位减小率更大.另外,方案S1顶板存在以抗剪安全系数为限定条件的最佳空心率45％;方案S2中上板存在以结构构造要求为限定条件的最佳空心率48.6％.若实际工程中地下水位较高,应通过抗剪安全系数和抗浮安全水位两个限定条件综合考虑最佳空心率.为了验证数值模拟结果的可靠性,以方案S1中空心率为40％的结构为原型,进行几何相似比例为1∶25的缩尺模型试验.试验结果表明,模型试验与数值模拟得到的弯矩、位移误差较小,变化规律相似.
Abstract
In order to investigate the mechanical performance of the frame structure under different hollow rates,this paper incorporates the structural form and theoretical method of the multi-ribbed hollow slab in the building structure.A multi-ribbed hollow slab structure is introduced into the main structure design of the metro station,and the finite element software ANSYS is used.The mechanical properties of the top slab and upper middle slab in bending,shearing,crack width and floating resistance are analyzed at different hollow rates,and the variation laws of bending moment,shear safety factor,crack width and anti-floating safety water level with hollow rates were obtained.The results show that the bending moment,shear safety factor,crack width and anti-floating safety water level of the hollow rates are all reduced under schemes S1 and S2,when the hollow rate increases within the scope of the specification.Among them,the change of hollow rate has the greatest influence on the bending moment of the section near the side wall,and the smallest influence on the bending moment of the column section,The longitudinal rib spacing has a greater impact on the shear safety factor than the transverse rib spacing.The crack width decreases at the mid-span section is the most prominent,and S2 has a greater reduction rate of anti-floating safety water level than S1.In addition,the top slab of scheme S1 has the optimal hollow rate with the shear safety factor as the limitation factor,and its value is 45％.The upper middle slab of scheme S2 has the optimal hollow rate with the structure requirements as the limitation factor,and the value is 48.6％.If the groundwater level is high in the actual project,the optimal hollow rate should be considered comprehensively through the two limitation factors of the shear safety factor and the anti-floating safety water level.In order to verify the accuracy of numerical simulation results,a scale model test with geometric similarity ratio of 1∶25 is carried out on the structure with 40％hollow rate in scheme S1.The test results show that the error of bending moment and displacement obtained by model test and numerical simulation is small,and the variation law is similar.
关键词
框架结构/密肋空心板/空心率/模型试验/受力特性Key words
frame structure/ribbed hollow slab/hollow ratio/model test/mechanical characteristics引用本文复制引用
基金项目
国家自然科学基金项目(51668036)
国家自然科学基金项目(51868041)
长江学者和创新团队发展计划项目(IRT_15R29)
轨道交通工程信息化国家重点实验室项目(18-40)
出版年
2024
NETL
NSTL
万方数据