高铁槽形梁斜拉桥塔梁固接结构试验研究及数值分析

发布时间：2018-01-01 17:09

本文关键词：高铁槽形梁斜拉桥塔梁固接结构试验研究及数值分析　出处：《铁道学报》2015年03期 　论文类型：期刊论文

【摘要】：以沪昆高铁某独塔斜拉桥为研究对象,模型试验与数值模拟相结合,研究槽形截面斜拉桥的塔梁固接结构模型的试验方法、受力状态、极限承载能力以及传力机理等。研究表明:运营阶段荷载作用下,斜拉桥塔梁固接区的应力水平较低,纵向和竖向正应力在6.5 MPa以内,塔梁结合部具有较强的安全储备;在梁体抗弯强度极限荷载下,靠近固接区主跨侧槽形梁断面最先破坏,固接区截面抗弯强度大于主梁断面;槽形截面边箱梁和桥面板传力特征在主梁和塔梁固接区基本一致,边箱梁为主要受力构件;较之于塔梁固接区,主梁内的桥面板剪力滞效应更为明显。
[Abstract]:Taking a single tower cable-stayed bridge of Shanghai-Kunming high-speed railway as the research object, the model test method and the stress state of the tower beam-fixed structure model of the cable-stayed bridge with slot section are studied by combining the model test with numerical simulation. The ultimate load-carrying capacity and the mechanism of load transfer are studied. The results show that the stress level is lower and the longitudinal and vertical normal stress is less than 6.5 MPa under the load of operation stage. There is a strong safety reserve in the junction of tower and beam; Under the ultimate load of the bending strength of the beam, the cross section of the beam near the fixed zone is destroyed first, and the flexural strength of the section in the fixed zone is higher than that of the section of the main beam. The force transfer characteristics of side box girder and bridge deck are basically the same in the fixed zone of main girder and tower beam, and the edge box girder is the main force member. The shear lag effect of bridge deck is more obvious than that of tower beam.
【作者单位】：中南大学土木工程学院;高速铁路建造技术国家工程实验室;
【基金】：国家自然科学基金(51378503,U1334203)
【分类号】：U446;U448.27
【正文快照】： 槽形截面桥梁可节省下部净空,广泛应用于城市轨道交通。对于跨越既有高速铁路的有砟轨道桥梁,采用槽型截面还能防止道砟掉落至桥下高铁,阻隔列车噪音。国内学者对槽形梁的静力行为进行了一定的研究。陆光闾等[1]采用三维实体模型对铁路槽形截面连续梁进行了整体空间分析;聂建

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