大跨度弦支混凝土梁结构静动力性能与施工过程分析  

Analysis of Static and Dynamic Performance and Construction Process of Long-span Chord Supported Concrete Beam Structure

作　　者：饶强 RAO Qiang(China Railway 12th Bureau Group Construction and Installation Engineering Co.,Ltd.,Taiyuan 030024,China)

机构地区：[1]中铁十二局集团建筑安装工程有限公司,太原030024

出　　处：《中国厨卫》2025年第2期288-290,共3页Chinese Kitchen & Bathroom

摘　　要：文章以某大跨度混凝土结构体育场馆为研究对象,应用数值模拟的方法对大跨度弦支梁的静力性能和动力性能进行分析,并对施工过程中结构的内力和变形进行计算。研究结果表明,随着垂跨比的增加,大跨度弦支混凝土梁的位移和弯矩均呈现非线性增加且增速不断减小的趋势,中间撑杆的最大应力呈现逐步增加的趋势,而拉索的轴力则表现为近线性减小;3种不同边界条件工况的弦支混凝土梁自振频率均呈指数增加的趋势,在相同的振型中,两端固结和一端固结一端铰接的频率大致相同,而两端铰接的频率比前两者略低;弦支混凝土产生向上的挠度,变形表现为两端小、中间大,最大位移达到1.6 cm,且受到边界条件的强约束作用,在边框架旁侧的弦支混凝土梁位移较小;弦支混凝土的应力在支座处最大,1/4跨处次之,跨中最小,最大应力为4.30 MPa。Taking a long-span concrete stadium as the research object,this paper analyzes the static and dynamic performance of the long-span string supported beam by using the method of numerical simulation,and calculates the internal force and deformation of the structure in the construction process.The results show that with the increase of the vertical span ratio,the displacement and bending moment of the long-span chord supported concrete beam increase nonlinearly and the growth rate decreases continuously.The maximum stress of the intermediate strut increases gradually,while the axial force of the cable decreases nearly linearly;The results show that the natural frequencies of chord supported concrete beams under three different boundary conditions all increase exponentially.In the same vibration mode,the frequencies of two end consolidation and one end consolidation with one end hinged are roughly the same,while the frequencies of two end hinged are slightly lower than the former two;The chord supported concrete has an upward deflection,the deformation is small at both ends and large in the middle,and the maximum displacement reaches 1.6 cm,which is strongly constrained by the boundary conditions.The displacement of the chord supported concrete beam on the side of the frame is small;The stress of chord supported concrete is the largest at the support,followed by 1/4 span,and the smallest at the middle of the span,with the maximum stress of 4.30 MPa.

关 键 词：建筑工程 大跨度结构 静动力性能 弦支混凝土 施工分析 

分 类 号：TU931[建筑科学—结构工程]