高速铁路大跨钢桁加劲连续刚构桥长期变形影响因素研究
U238%U448.13; 为研究钢桁长度和高度以及合龙顺序和顶推力对钢桁加劲连续刚构桥长期变形的影响,以某在建钢桁加劲连续刚构桥为对象,采用有限元软件建立实体模型,考虑混凝土收缩徐变作用,对恒载作用下运营20年内的变形进行分析,系统分析钢桁长度和高度对连续刚构桥长期变形的影响程度,同时利用结构力学原理推导不同合龙顺序下的顶推力解析式,探讨合龙顺序和顶推力对连续刚构桥长期变形的影响.结果表明:钢桁长度和高度的增加均可使挠跨比下降,均能提高桥梁的整体刚度,考虑到实际结构受力及施工难度,建议钢桁长度在桥梁中跨长度的3/4～7/8范围内选择,挠跨比下降42.3％～44.1％,为避免出现设计过于保守的...
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| Published in | 铁道标准设计 Vol. 68; no. 11; pp. 87 - 93 |
|---|---|
| Main Authors | , , , , , |
| Format | Journal Article |
| Language | Chinese |
| Published |
西南交通大学土木工程材料研究所,成都 610031%西南交通大学土木工程学院,成都 610031%西南交通大学土木工程学院,成都 610031
01.11.2024
成都大学建筑与土木工程学院,成都 610106 四川省公路规划勘察设计研究院有限公司,成都 610041%中铁四局集团有限公司第七工程分公司,合肥 230022 西南交通大学土木工程学院,成都 610031 |
| Subjects | |
| Online Access | Get full text |
| ISSN | 1004-2954 |
| DOI | 10.13238/j.issn.1004-2954.202303270003 |
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| Abstract | U238%U448.13; 为研究钢桁长度和高度以及合龙顺序和顶推力对钢桁加劲连续刚构桥长期变形的影响,以某在建钢桁加劲连续刚构桥为对象,采用有限元软件建立实体模型,考虑混凝土收缩徐变作用,对恒载作用下运营20年内的变形进行分析,系统分析钢桁长度和高度对连续刚构桥长期变形的影响程度,同时利用结构力学原理推导不同合龙顺序下的顶推力解析式,探讨合龙顺序和顶推力对连续刚构桥长期变形的影响.结果表明:钢桁长度和高度的增加均可使挠跨比下降,均能提高桥梁的整体刚度,考虑到实际结构受力及施工难度,建议钢桁长度在桥梁中跨长度的3/4～7/8范围内选择,挠跨比下降42.3％～44.1％,为避免出现设计过于保守的情况,建议钢桁高度取12 m,挠跨比下降43.8％;推导出不同合龙顺序下的顶推力解析式,只与桥墩和主梁的参数有关,计算简便、概念清晰,可指导实际工程中顶推力的确定;不同合龙顺序对钢桁加劲连续刚构桥长期变形的影响较小,施加顶推力后可明显改善钢桁加劲连续刚构桥的长期变形,建议在施工过程中采用先中后边的合龙顺序,同时施加顶推力,在运营20年时边跨和中跨最大竖向变形分别下降34.6％和34.2％. |
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| AbstractList | U238%U448.13; 为研究钢桁长度和高度以及合龙顺序和顶推力对钢桁加劲连续刚构桥长期变形的影响,以某在建钢桁加劲连续刚构桥为对象,采用有限元软件建立实体模型,考虑混凝土收缩徐变作用,对恒载作用下运营20年内的变形进行分析,系统分析钢桁长度和高度对连续刚构桥长期变形的影响程度,同时利用结构力学原理推导不同合龙顺序下的顶推力解析式,探讨合龙顺序和顶推力对连续刚构桥长期变形的影响.结果表明:钢桁长度和高度的增加均可使挠跨比下降,均能提高桥梁的整体刚度,考虑到实际结构受力及施工难度,建议钢桁长度在桥梁中跨长度的3/4～7/8范围内选择,挠跨比下降42.3％～44.1％,为避免出现设计过于保守的情况,建议钢桁高度取12 m,挠跨比下降43.8％;推导出不同合龙顺序下的顶推力解析式,只与桥墩和主梁的参数有关,计算简便、概念清晰,可指导实际工程中顶推力的确定;不同合龙顺序对钢桁加劲连续刚构桥长期变形的影响较小,施加顶推力后可明显改善钢桁加劲连续刚构桥的长期变形,建议在施工过程中采用先中后边的合龙顺序,同时施加顶推力,在运营20年时边跨和中跨最大竖向变形分别下降34.6％和34.2％. |
| Abstract_FL | To study the effects of steel truss length,height,closure sequence,and thrust on the long-term deformation of steel truss-reinforced continuous rigid frame bridges,finite element software was used to establish a solid model of a steel truss-reinforced continuous rigid frame bridge under construction.Considering the effects of concrete shrinkage and creep,the deformation over a 20-year operational period under constant load was analyzed,focusing on the influence of truss length and height on long-term deformation.Furthermore,analytical formulas for thrust under different closure sequences were derived using principles of structural mechanics to assess their impact on long-term deformation.The results showed that increasing both the truss length and height reduced the deflection-span ratio,thereby improving the bridge's overall stiffness.Considering the actual structural forces and construction difficulty,it was recommended to select the steel truss length within 3/4 to 7/8 of the mid-span length,which achieved a 42.3％to 44.1％reduction in the deflection-span ratio.To avoid overly conservative designs,a steel truss height of 12 meters was suggested,yielding a 43.8％reduction in deflection-span ratio.The derived analytical formulas for thrust under various closure sequences,which relied solely on pier and main beam parameters,provided a simple and clear calculation method,offering practical guidance for determining thrust in engineering projects.The study found that different closure sequences had a relatively minor impact on the bridge's long-term deformation.However,applying thrust significantly improved its long-term performance.A closure sequence that first completes the mid-span before the edges,along with the simultaneous application of thrust,was recommended.After 20 years of operation with this sequence,the maximum vertical deformations of the edge and mid-span decreased by 34.6％and 34.2％,respectively. |
| Author | 张程 邵俊虎 占玉林 林金根 张志强 陈文尹 |
| AuthorAffiliation | 西南交通大学土木工程学院,成都 610031;西南交通大学土木工程材料研究所,成都 610031%西南交通大学土木工程学院,成都 610031%西南交通大学土木工程学院,成都 610031;成都大学建筑与土木工程学院,成都 610106;四川省公路规划勘察设计研究院有限公司,成都 610041%中铁四局集团有限公司第七工程分公司,合肥 230022 |
| AuthorAffiliation_xml | – name: 西南交通大学土木工程学院,成都 610031;西南交通大学土木工程材料研究所,成都 610031%西南交通大学土木工程学院,成都 610031%西南交通大学土木工程学院,成都 610031;成都大学建筑与土木工程学院,成都 610106;四川省公路规划勘察设计研究院有限公司,成都 610041%中铁四局集团有限公司第七工程分公司,合肥 230022 |
| Author_FL | CHEN Wenyin ZHAN Yulin ZHANG Zhiqiang ZHANG Cheng LIN Jingen SHAO Junhu |
| Author_FL_xml | – sequence: 1 fullname: ZHAN Yulin – sequence: 2 fullname: LIN Jingen – sequence: 3 fullname: ZHANG Cheng – sequence: 4 fullname: ZHANG Zhiqiang – sequence: 5 fullname: SHAO Junhu – sequence: 6 fullname: CHEN Wenyin |
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| DocumentTitle_FL | Study on Influencing Factors of Long-Term Deformation in Large-Span Steel Truss-Reinforced Continuous Rigid Frame Bridges in High-Speed Railways |
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| Keywords | long-term deformation 顶推力 钢桁高度 closure sequence 高速铁路 长期变形 high-speed railway 钢桁加劲连续刚构桥 钢桁长度 steel truss length 铁路桥 railway bridge steel truss-reinforced continuous rigid frame bridges steel truss height thrust 合龙顺序 |
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| PublicationTitle | 铁道标准设计 |
| PublicationTitle_FL | Railway Standard Design |
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| Publisher | 西南交通大学土木工程材料研究所,成都 610031%西南交通大学土木工程学院,成都 610031%西南交通大学土木工程学院,成都 610031 成都大学建筑与土木工程学院,成都 610106 四川省公路规划勘察设计研究院有限公司,成都 610041%中铁四局集团有限公司第七工程分公司,合肥 230022 西南交通大学土木工程学院,成都 610031 |
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| Title | 高速铁路大跨钢桁加劲连续刚构桥长期变形影响因素研究 |
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