钢-混凝土组合与叠合梁自振特性研究
|
摘要
为改善连续组合梁在负弯矩区的受力性能和抗裂性能,构造了组合与叠合双重作用梁截面,其中叠合作用采用抗拔不抗剪连接技术。根据组合与叠合梁的工作原理,给出了负弯矩区组合与叠合梁抗拔不抗剪连接件的设计方法。假设上、下层梁竖向变形一致,导出了混凝土顶板未开裂和正常使用两个阶段组合与叠合梁自振频率的计算公式。通过算例分析得出:在负弯矩区段,叠合所需抗拔连接件的个数远少于组合抗剪连接件的个数;叠合界面粘结力未破坏时与组合梁完全等效;粘结力失效后,刚度下降,自振频率下降幅度较大;混凝土顶板开裂后,刚度变化很小,自振频率下降甚微。
In order to improve the forced performance and anti-cracking performance of a continuous composite beam in the negative bending-moment field, a new type of cross section of a composite and laminated double-action beam is constructed, in which case the superimposed action adopts the anti-uplifting-slip-free connective technique. According to the composite and superimposing working principles, the design methods for the anti-uplifting-slip-free connectors of the composite and superimposed beam in the negative bending-moment field are given in the present paper. Provided that the vertical deformations of the upper and lower beams are the same, the calculation formulae for the self-vibration frequencies of the composite and superimposed beam, when the top concrete plate does not crack or the beam is normally used, are derived in the paper. Upon the basis of analyzing the calculation examples, it is found that in the negative bending-moment field the number of the anti-uplifting connectors required by superimposing is far less than that of the anti-shear connectors required by the composite beam; the bonding power of the overlapping interface is the same in effect as that of the composite beam when the bonding power does not fail; however, when the bonding power fails, the stiffness falls and the frequency of the self vibration falls relatively sharply; when the top concrete plates crack, the change in stiffness is very little and the frequency of the self vibration also falls quite slightly.
In order to improve the forced performance and anti-cracking performance of a continuous composite beam in the negative bending-moment field, a new type of cross section of a composite and laminated double-action beam is constructed, in which case the superimposed action adopts the anti-uplifting-slip-free connective technique. According to the composite and superimposing working principles, the design methods for the anti-uplifting-slip-free connectors of the composite and superimposed beam in the negative bending-moment field are given in the present paper. Provided that the vertical deformations of the upper and lower beams are the same, the calculation formulae for the self-vibration frequencies of the composite and superimposed beam, when the top concrete plate does not crack or the beam is normally used, are derived in the paper. Upon the basis of analyzing the calculation examples, it is found that in the negative bending-moment field the number of the anti-uplifting connectors required by superimposing is far less than that of the anti-shear connectors required by the composite beam; the bonding power of the overlapping interface is the same in effect as that of the composite beam when the bonding power does not fail; however, when the bonding power fails, the stiffness falls and the frequency of the self vibration falls relatively sharply; when the top concrete plates crack, the change in stiffness is very little and the frequency of the self vibration also falls quite slightly.
引文
[1] REINER,S.Bridges with double composite action [J].Structural Engineering International,1996 (01):32-36
[2]段树金,霍军会,周庆东.钢-混凝土双面组合梁极限承载力计算方法研究[J].石家庄铁道学院学报(自然科学版),2007(04):1-5
[3]段树金,霍军会,安蕊梅.钢-混凝土双面组合连续梁承载能力研究[J].铁道学报,2010,32(05):82-87
[4]聂建国,陶慕轩,聂鑫,等.抗拔不抗剪连接新技术及其应用[J].土木工程学报,2015,48(04):7-14,58
[5] 段树金,牛润明,安蕊梅,等.钢-混凝土组合与叠合双重作用连续箱梁桥:ZL 201621090805.0[P].2017-04-19
[6]聂鑫.钢-混凝土组合刚构桥关键结构受力性能研究[D].北京:清华大学,2013
[7]王园园.钢-混凝土组合与叠合梁静力性能试验研究[D].石家庄:石家庄铁道大学,2018
[8]聂建国,马原.抗拔不抗剪连接抗拔性能试验研究[J].特种结构,2015,32(03):6-12
[9]王园园,段树金,牛润明.钢-混凝土组合与叠合双重作用梁负弯矩区刚度和叠合面滑移研究[J].工程力学,2018,35(S1):265-269
[2]段树金,霍军会,周庆东.钢-混凝土双面组合梁极限承载力计算方法研究[J].石家庄铁道学院学报(自然科学版),2007(04):1-5
[3]段树金,霍军会,安蕊梅.钢-混凝土双面组合连续梁承载能力研究[J].铁道学报,2010,32(05):82-87
[4]聂建国,陶慕轩,聂鑫,等.抗拔不抗剪连接新技术及其应用[J].土木工程学报,2015,48(04):7-14,58
[5] 段树金,牛润明,安蕊梅,等.钢-混凝土组合与叠合双重作用连续箱梁桥:ZL 201621090805.0[P].2017-04-19
[6]聂鑫.钢-混凝土组合刚构桥关键结构受力性能研究[D].北京:清华大学,2013
[7]王园园.钢-混凝土组合与叠合梁静力性能试验研究[D].石家庄:石家庄铁道大学,2018
[8]聂建国,马原.抗拔不抗剪连接抗拔性能试验研究[J].特种结构,2015,32(03):6-12
[9]王园园,段树金,牛润明.钢-混凝土组合与叠合双重作用梁负弯矩区刚度和叠合面滑移研究[J].工程力学,2018,35(S1):265-269