温度效应对矮塔斜拉桥墩梁支撑体系的影响  

Influence of temperature effects on the pylon-beam support system of cable-stayed bridges

作　　者：赵立财 ZHAO Licai(The Third Engineering Co.Ltd.,China Railway 19th Bureau Group,Shenyang 110136,Liaoning Province,P.R.China;Department of Civil and Construction Engineering,National Taiwan University of Science and Technology,Taipei 10607,Taiwan,P.R.China)

机构地区：[1]中铁十九局集团第三工程有限公司,辽宁沈阳110136 [2]台湾科技大学营建工程系,中国台湾台北10607

出　　处：《深圳大学学报（理工版）》2024年第5期635-642,共8页Journal of Shenzhen University(Science and Engineering)

基　　金：辽宁省“兴辽英才计划”青年拔尖人才资助项目(XLYC2007146);中国铁建股份有限公司科技研究开发计划项目(2020-C20)。

摘　　要：为探究单索面多跨矮塔斜拉桥在温度作用下的受力特性,以某矮塔斜拉桥工程为例,基于Midas/civil软件建立了全桥有限元模型,分析了不同墩梁支撑体系下的多跨矮塔斜拉桥体系温度效应.分别考虑中塔、次边塔及边塔均为墩梁全固结(体系1),边塔为墩梁铰接、中塔及次边塔为墩梁固结(体系2),中塔为墩梁固结、次边塔及边塔为墩梁铰接(体系3),次边塔为墩梁固结、中塔及边塔为墩梁铰接(体系4),边塔为墩梁固结、中塔及次边塔为墩梁铰接(体系5)等5种组合下的墩梁支撑体系方案,分析墩梁支撑体系在升温或降温20℃时,主梁与主塔的应力与位移变化规律.研究表明,体系温度效应对墩梁全固结支撑体系下的主梁与主塔的位移与应力产生显著影响.在体系1中,体系温差为20℃时,主梁与主塔的最大位移分别为66.6 mm与94.07 mm,主梁与主塔应力分别为5.95 MPa与5.96 MPa;体系温度效应对仅在中塔处进行墩梁固结而其余位置进行墩梁铰接的体系下主梁与主塔的位移产生显著影响,但对其应力影响则较小;在体系3中,体系温差为20℃时,主梁与主塔的最大位移分别为74.20 mm与70.67 mm,主梁与主塔应力分别为0.59 MPa与0.48 MPa;在相同体系温度下中塔、次边塔和边塔位置任意选择两个墩梁固结,其余位置为墩梁铰接时,中塔、次边塔以及边塔位置处主梁结构响应显示出较高的相似性,且体系温度效应对主梁结构位移和应力产生的影响程度介于体系4和体系5之间.研究成果可为多跨矮塔斜拉主梁的施工线形控制提供参考.In order to explore the stress characteristics of a single-tower multi-span cable-stayed bridge under system temperature effects,taking a multi-span cable-stayed bridge project as an example,a full-bridge finite element model is established based on Midas/civil software to analyze the temperature effects of the multi-span cable-stayed bridge under different pier-beam support systems.The following five combinations of pier-beam support system schemes are studied.1)The secondary side tower,side tower,and central tower are all fully rigidly connected(System 1).2)Side tower is hinged at the pier-beam,while the secondary side tower and central towers are rigidly connected(System 2).3)The secondary side tower and side towers are hinged at the pier-beam,while the central tower is rigidly connected(System 3).4)The secondary side tower is rigidly connected,while side and central towers are hinged at the pier-beam(System 4).5)Side tower is rigidly connected,while the secondary side tower and central towers are hinged at the pier-beam(System 5).The study analyzes the stress and displacement variations of the main beam and main tower under a temperature change of+20℃or-20℃for the five different support system configurations.The research shows that the temperature effect significantly influences the displacement and stress of the main beam and main tower under the fully fixed support system.For System 1,at a temperature difference of 20℃,the maximum displacements of the main beam and main tower are 66.6 mm and 94.07 mm,with stresses of 5.95 MPa and 5.96 MPa,respectively.The temperature effect has a significant impact on the displacement of the main beam and main tower under the support system where only the middle tower is fixed and the rests are hinged,but has a minor effect on their stress.For System 3,at a temperature difference of 20℃,the maximum displacements of the main beam and main tower are 74.20 mm and 70.67 mm,with stresses of 0.59 MPa and 0.48 MPa,respectively.Under the same temperature conditions,when any

关 键 词：桥梁工程 矮塔斜拉桥 温度效应 墩梁固结 支撑体系 结构响应 

分 类 号：U441.2[建筑科学—桥梁与隧道工程]