[1]陈 旭,章胜平,霍 红,等.连续组合梁收缩的约束力研究[J].南京理工大学学报(自然科学版),2019,43(05):607-614.[doi:10.14177/j.cnki.32-1397n.2019.43.05.010]
 Chen Xu,Zhang Shengping,Huo Hong,et al.Research on restraint force of continuous composite beam[J].Journal of Nanjing University of Science and Technology,2019,43(05):607-614.[doi:10.14177/j.cnki.32-1397n.2019.43.05.010]
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连续组合梁收缩的约束力研究()
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《南京理工大学学报》(自然科学版)[ISSN:1005-9830/CN:32-1397/N]

卷:
43卷
期数:
2019年05期
页码:
607-614
栏目:
出版日期:
2019-10-31

文章信息/Info

Title:
Research on restraint force of continuous composite beam
文章编号:
1005-9830(2019)05-0607-08
作者:
陈 旭1章胜平2霍 红1毛德均1余文正1
1.昆明学院 建筑工程学院,云南 昆明 650214; 2.昆明理工大学 建筑工程学院,云南 昆明 650504
Author(s):
Chen Xu1Zhang Shengping2Huo Hong1Mao Dejun1Yu Wenzheng1
1.School of Construction Engineering,Kunming University,Kunming 650214,China; 2.School of Construction Engineering,Kunming University of Science and Technology,Kunming 650504,China
关键词:
连续组合梁 约束力 解析法 改进迪辛格法 变荷载 次内力
Keywords:
continuous composite beams restraint forces analytical method improved Dischinger method loads increasing in time secondary internal forces
分类号:
TU398
DOI:
10.14177/j.cnki.32-1397n.2019.43.05.010
摘要:
连续组合梁的混凝土板收缩时将产生较大的弯曲变形。弯曲变形受到钢梁约束产生内部约束力,受到冗余支座约束产生外部约束力。至今对连续组合梁收缩的内部和外部超静定相互耦合的解析分析存在不足。该文对内部超静定引入重分布系数,同时考虑徐变和钢梁约束对柔度系数的修正。按照外部约束力为时间增函数的变荷载特性,进行组合截面应变的增量分析。以钢梁约束弯矩为解耦未知量,基于改进迪辛格法推导重分布系数和钢梁约束弯矩的近似计算公式,结果与微分方程组的精确解吻合。给出了两跨连续组合梁支点次反力和次弯矩的解析式。对收缩徐变的处理方法适用于多跨连续梁。徐变对连续组合梁收缩的次内力有缓解作用,按照常荷载折减系数约为0.625,按照变荷载约0.77。钢梁高度增加将显著加大连续组合梁收缩的外部约束力。
Abstract:
The shrinkage of the concrete slab of the continuous composite beam produces large bending deformation. The deformation is restrained by the internal steel beam and the external redundant support resulting in the corresponding internal and external restraint forces. So far the analytical analysis of the coupling of internal and external statically indeterminate problems of the continuous composite beam shrinkage is deficient. For the internal statically indeterminate problem,the modification of the flexibility coefficient is considered by introducing the redistribution coefficient considering both creep effects and steel beam constraints. The incremental analysis of strains on the composite section is carried out according to the variable load characteristics of the external restraint forces. Based on the improved dischinger method,the approximate formulas for calculating the redistribution coefficient and the restraint moment of the steel beam are obtained by using the restraint moment of the steel beam as the decoupling unknown quantity,and the result is in agreement with the exact solution of the differential equations. The analytic formula of the secondary reaction force and moment of the two-span continuous composite beam is given,and the method of shrinkage and creep can be applied to the multi span continuous beam. Creep has mitigating effect on secondary forces of the continuous composite beam,reduction coefficient is about 0.625 for the constant load and 0.77 for the variable load. The increase of the steel beam height significantly increases the external restraint forces of the continuous composite beam.

参考文献/References:

[1] 樊健生,聂鑫,李全旺. 考虑收缩、徐变及开裂影响的组合梁长期受力性能研究(Ⅱ)——理论分析[J]. 土木工程学报,2009,42(3):16-22.
Fan Jiansheng,Nie Xin,Li Quanwang. Long-term behavior of composite beams with shrinkage,creep and cracking(Ⅱ):theoretical analysis[J]. China Civil Engineering Journal,2009,42(3):16-22.
[2]Ranzi G,Leoni G,Zandonini R. State of the art on the time-dependent behavior of composite steel-concrete structures[J]. Journal of Constructional Steel Research,2013,80(1):252-263.
[3]Kindmann R,Xia G. Erweiterung der berechnungsverfahren für verbundtr?ger[J]. Stahlbau,2000,69(3):170-183.
[4]Iliopoulos A. Kriechbeiwerte für die berechnung von verbundtr?gern[J]. Stahlbau,2006,75(5):375-379.
[5]陈旭,章胜平,莫南明,等. 组合梁截面重分布力的Volterra积分方程[J]. 铁道学报,2019,41(4):142-150.
Chen Xu,Zhang Shengping,Mo Nanming,et al. Volterra integral equation of sectional redistributed forces of composite beams[J]. Journal of the China Railway Society,2019,41(4):142-150.
[6]Partov D,Kantchenv V. Gardner and Lockman model in creep analysis of composite steel-concrete sections[J]. ACI Structural Journal,2014,111(1):59-69.
[7]Tong Teng,Yu Qiang,Su Qingtian. Coupled effects of concrete shrinkage,creep,and cracking on the performance of postconnected prestressed steel-concrete composite girders[J]. Journal of Bridge Engineering,2018,23(3):04017145.
[8]Zhang Shengping,Chen Xu,Wang Fengxian. Creep fibre method of simply-supported composite beams[C]//IOP Conference Series:Earth and Environmental Science. London,UK:Institute of Physics Publishing,2019,267:042108.
[9]Peng Zuqiang,Chen Xu,Zhang Shengping. Mathematic solution of the differential equations on composite beam creep[C]//IOP Conference Series:Earth and Environmental Science. London,UK:Institute of Physics Publishing,2019,304:032043.
[10]Ranzi G,Leoni G,Zandonini R. State of the art on the time-dependent behavior of composite steel-concrete structures[J]. Journal of Constructional Steel Research,2013,80(1):252-263.
[11]Zhang Shengping,Chen Xu,Lai Yingliang. Study on the influence of the height of steel beam on creep effects of composite beams[C]//IOP Conference Series:Earth and Environmental Science. London,UK:Institute of Physics Publishing,2019,267:032067.
[12]Zhang Shengping,Chen Xu,Li Guoliang. Study on the influence of reinforcement on creep and shrinkage effects of composite beams[C]//IOP Conference Series:Earth and Environmental Science. London,UK:Institute of Physics Publishing,2019,267:032068.
[13]Gilbert R I,Brandford M A. Time-dependent behaviour of simply-supported steel-concrete composite beams[J]. Magazine of Concrete Research,1991,43(157):265-274.
[14]Souici A,Tehami M,Rahal N,et al. Creep effect on composite beam with perfect steel-concrete connection[J]. International Journal of Steel Structures,2015,15(2):433-445.
[15]陈旭,莫南明,邱志刚,等. 混凝土松弛系数的实用计算[J]. 公路交通科技,2018,35(3):18-27.
Chen Xu,Mo Nanming,Qiu Zhigang,et al. Practical calculation of concrete relaxation coefficient[J]. Journal of Highway and Transportation Research and Development,2018,35(3):18-27.
[16]谢峻,余天庆. 部分剪力连接钢-混凝土组合梁的截面抗弯分析[J]. 南京理工大学学报,2000,24(5):453-456.
Xie Jun,Yu Tianqing. Analysis of bending capacity of steel-composite beams with partial shear connection[J]. Journal of Nanjing University of Science and technology,2000,24(5):453-456.

备注/Memo

备注/Memo:
收稿日期:2018-06-12 修回日期:2019-03-24
基金项目:国家自然科学基金(51868034; 51668027); 昆明学院科学研究项目(XJZZ17011; YJL16010)
作者简介:陈旭(1978-),女,博士,副教授,主要研究方向:组合结构和混凝土结构,E-mail:126958074@qq.com。
引文格式:陈旭,章胜平,霍红,等. 连续组合梁收缩的约束力研究[J]. 南京理工大学学报,2019,43(5):607-614.
投稿网址:http://zrxuebao.njust.edu.cn
更新日期/Last Update: 2019-11-30