钢-混凝土拱肋混合接头模型试验研究
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摘要
钢-混凝土拱肋混合接头充分利用了钢和混凝土的受力特点,将钢拱采用混凝土外包,形成箱型截面混合梁结构,通过在弦杆间浇筑混凝土板以形成双叠合梁结构,且两种结构形式在结合处形成钢-混凝土结合拱肋混合接头。通过1∶5大比例结构模型试验,分别研究了钢拱肋合龙工况(工况1)、成桥工况(工况2)、主力组合工况(工况3)、主+附组合工况(工况4)、1. 5倍主力组合工况(工况5)的加载试验,研究钢-混凝土结合拱肋混合接头受力特性、传力机理、变形和承载能力,验证接头设计的强度、刚度、稳定性是否满足GB 50917—2013《钢-混凝土组合桥梁设计》要求,进而对钢-混凝土结合拱肋混合接头提出构造优化建议。研究结果表明:所有工况的试验过程中拱肋主要部分处于弹性状态,钢结构未出现塑性变形及失稳等现象,应力水平满足GB 50917—2013要求,结构承载能力满足设计要求。有限元计算提出的优化措施效果在模型试验中得到了验证,实桥设计可按优化后方案进行。
The steel-concrete arch rib joints takes full advantage of the mechanical characteristics of steel and concrete. The steel arch was encased by concrete to form a box section mixed beam structure. Concrete slabs were poured between the chords to form a double composite beam structure. Then the steel concrete arch rib joint of these two structures was formed. In the paper,the 1 ∶5 large scale structural model test was used to study the steel arch rib closing condition( condition 1),the bridge working condition( condition 2),the main combined working condition( condition 3),and the main + attachment combination condition( condition 4) and 1. 5 times main combined working condition( condition 5). The mechanical characteristics,force transmission mechanism,deformation and bearing capacity of steel-concrete arch rib mixed joints were studied. It was rerified whether the strength,stiffness,and stability of the joint design could meet the requirements of code for Design of Steel and Concrete Composite Bridges( GB 50917—2013). Furthermore,some suggestions for structural optimization of steel-concrete composite arch rib joints were put forward.The results showed that the main part of the arch rib was in elastic state during the test of all test conditions. There was no plastic deformation and instability in the steel structure. Stress level could meet the specification requirements.The bearing capacity of the structure could meet the design requirements.The effect of the optimization measures proposed by finite element calculation was verified in the model test. The real bridge design could be carried out according to the optimized scheme.
The steel-concrete arch rib joints takes full advantage of the mechanical characteristics of steel and concrete. The steel arch was encased by concrete to form a box section mixed beam structure. Concrete slabs were poured between the chords to form a double composite beam structure. Then the steel concrete arch rib joint of these two structures was formed. In the paper,the 1 ∶5 large scale structural model test was used to study the steel arch rib closing condition( condition 1),the bridge working condition( condition 2),the main combined working condition( condition 3),and the main + attachment combination condition( condition 4) and 1. 5 times main combined working condition( condition 5). The mechanical characteristics,force transmission mechanism,deformation and bearing capacity of steel-concrete arch rib mixed joints were studied. It was rerified whether the strength,stiffness,and stability of the joint design could meet the requirements of code for Design of Steel and Concrete Composite Bridges( GB 50917—2013). Furthermore,some suggestions for structural optimization of steel-concrete composite arch rib joints were put forward.The results showed that the main part of the arch rib was in elastic state during the test of all test conditions. There was no plastic deformation and instability in the steel structure. Stress level could meet the specification requirements.The bearing capacity of the structure could meet the design requirements.The effect of the optimization measures proposed by finite element calculation was verified in the model test. The real bridge design could be carried out according to the optimized scheme.
引文
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[12]胡长明,郭艳,梅源,等.模板支撑系统承载性能的试验研究[J].西安建筑科技大学学报(自然科学版),2017(4):179-186.
[13]中华人民共和国住房和城乡建设部.钢-混凝土组合桥梁设计规范:GB 50917—2013[S].北京:中国建筑工业出版社,2013.
[2]梁会东.钢-混凝土接头试验研究与受力性能分析[D].成都:西南交通大学,2006.
[3]周端明.钢-混凝土混合拱桥接头受力性能研究[D].重庆:重庆交通大学,2008.
[4]苏小梅,程斌,侯华东.某提篮拱桥拱肋下弦钢-混凝土结合段剪力钉分析及优化[J].钢结构,2017,32(11):91-95.
[5]马德才,杨晨霞,赵文宏.中承式钢管混凝土系杆拱桥主桥主跨拱脚模型试验[J].天津建设科技,2012(2):66-68.
[6]马俊.碟式CSP钢构机架风洞模型相似设计研究[D].长沙:湖南科技大学,2015.
[7]李树山,解伟.混凝土结构模型试验的相似理论研究[J].河南科技,2010(1):83-85.
[8]中华人民共和国住房和城乡建设部,钢结构设计标准:GB50017—2017[S].北京:中国建筑工业出版社,2017.
[9]聂永福.尼尔森拱桥施工监控技术[J].山西建筑,2017(12):169-170.
[10]罗甲生,李跃,王建辉,等.大跨度拱桥边拱钢拱肋与刚性系杆连接区域试验研究[J].桥梁建设,2007(1):39-42.
[11]吴文明,刘玉擎,蒋劲松,等.混合拱肋钢与混凝土结合部局部模型试验研究[J].公路交通科技(应用技术版),2008(4):113-116.
[12]胡长明,郭艳,梅源,等.模板支撑系统承载性能的试验研究[J].西安建筑科技大学学报(自然科学版),2017(4):179-186.
[13]中华人民共和国住房和城乡建设部.钢-混凝土组合桥梁设计规范:GB 50917—2013[S].北京:中国建筑工业出版社,2013.