高速铁路槽形连续梁拱桥拱脚局部应力分析与验证
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摘要
为了解高速铁路槽形连续梁拱桥拱梁固结段的真实应力状态及验证局部分析中边界条件表达的准确性,以济青高速铁路(66.5+142+66.5) m双线有砟轨道预应力混凝土连续槽形梁拱桥为工程背景,利用FEA有限元软件建立细化的空间实体有限元模型,分析中支点横截面空间效应,并对局部模型的边界条件模拟的正确性进行验证。分析表明:中支点截面应力呈现明显的空间不规律现象,恒载比活载剪力滞效应更为明显,局部位置如拱肋与主梁连接部位、主梁下缘支座处、横隔板进人孔倒角处应力集中,应适当加强配筋,其余部位应力均满足要求,通过验证局部模型的内力分布,确保实体模型应力结果的准确性,保证结构安全。
In order to investigate the real stress state of the arch foot of the prestressed concrete continuous channel beam arch bridge and verify the accuracy of the expressed local boundary conditions, a refined space solid finite element model is established. With the model, the spatial effect at the section of the support is analyzed and the accuracy of the expressed local boundary conditions are verified with reference to the engineering of a(66.5+142+66.5) m ballasted double line prestressed concrete continuous channel beam arch bridge on Jinan-Qingdao high-speed railway line. The analysis shows that the section of the support presents obvious spatial irregularities and the dead load is more irregular than live load in shearing force lag effect. The analysis also indicates that the pier-tower-girder fixed region experiences stress focus at several local positions such as the connection part of arch and girder, bearing edge, chamfer of manhole, where reinforcement should be strengthened appropriately, and the remaining parts' stress can meet the requirement. The accuracy of the solid model stress results is guaranteed by the validation of the local model's internal force distribution. As a result, the structural safety is ensured.
In order to investigate the real stress state of the arch foot of the prestressed concrete continuous channel beam arch bridge and verify the accuracy of the expressed local boundary conditions, a refined space solid finite element model is established. With the model, the spatial effect at the section of the support is analyzed and the accuracy of the expressed local boundary conditions are verified with reference to the engineering of a(66.5+142+66.5) m ballasted double line prestressed concrete continuous channel beam arch bridge on Jinan-Qingdao high-speed railway line. The analysis shows that the section of the support presents obvious spatial irregularities and the dead load is more irregular than live load in shearing force lag effect. The analysis also indicates that the pier-tower-girder fixed region experiences stress focus at several local positions such as the connection part of arch and girder, bearing edge, chamfer of manhole, where reinforcement should be strengthened appropriately, and the remaining parts' stress can meet the requirement. The accuracy of the solid model stress results is guaranteed by the validation of the local model's internal force distribution. As a result, the structural safety is ensured.
引文
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[2] 王文博.铁路简支槽形梁结构设计与动力仿真分析[J].铁道标准设计,2015,59(5):97-99.
[3] 张兴杰.预应力混凝土槽形梁应用及研究综述[J].山西建筑,2006,32(6):53-54.
[4] 胥为捷,薛伟辰.预应力混凝土槽形梁的研究与应用[J].建筑结构,2006,36(S1):594-599.
[5] 缪文辉,何涛.兰新二线风区槽形梁设计分析[J].铁道标准设计,2010(11):44-47.
[6] 胡匡璋,江新元,陆光闾.槽形梁[M].北京:中国铁道出版社,1987.
[7] 王起才,薛彦瑾,张戎令,等.高速铁路无砟轨道简支槽形梁静载弯矩试验研究[J].西安建筑科技大学学报(自然科学版),2016,48(4):463-467.
[8] 汪金辉.道砟桥面槽形梁结构受力性能研究[D].长沙:中南大学,2009.
[9] 戴公连,粟淼.高铁槽形梁斜拉桥塔梁固接结构试验研究及数值分析[J].铁道学报,2015,37(3):85-92.
[10] 李战胜.石济客运专线预应力混凝土槽形梁设计研究[J].铁道标准设计,2017,61(7):76-79.
[11] 李喜平,严爱国,张池权,等.沪通铁路(80+108+80) m连续槽形梁方案研究[J].铁道标准设计,2013,57(5):44-47.
[12] 吴大宏.济青高速铁路(40+70+70+40) m槽型连续梁设计研究[J].高速铁路技术,2018(2):53-56.
[13] 倪元增.槽形宽梁的剪力滞问题[J].土木工程学报,1986,19(4):32-41.
[14] 韦成龙,李斌.槽形宽翼梁剪滞效应分析的有限段法[J].公路交通科技.2009,26(1):83-87.
[15] 陆光闾.连续铁路槽形梁桥空间作用分析[J].铁道学报,2000,22(S):41-46.
[16] 郭丰哲,苏国明,周家新,等.基于英国BS5400的预应力混凝土槽形梁结构性能研究[J].铁道标准设计,2010(10):90-91.
[17] 高小妮,贺拴海,宋一凡.基于两类结构形式的索梁锚固区力学行为分析[J].郑州大学学报(工学版),2012,33(6):59-63.
[18] 王传素.槽形梁-拱组合桥梁拱结合部局部应力分析[J].四川建筑,2010,30(2):168-170.
[19] 邓江涛.高速铁路矮塔斜拉桥墩塔梁固结段局部应力分析与验证[J].铁道标准设计,2016,60(6):43-47.
[20] 季伟强.高速铁路矮塔斜拉桥主梁局部受力行为分析[J].铁道标准设计,2017,61(2):63-67.
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