斜拉桥异型拱塔施工临时横撑方案比选

发布时间：2018-08-09 18:39

【摘要】：南宁青山大桥主桥为主跨430m的双塔混合梁斜拉桥,桥塔采用钢筋混凝土异型拱结构,塔柱采用全自动液压爬模施工,施工中沿塔柱高度方向布置了5道临时横撑。为有效控制施工过程中桥塔的变形和应力,提出4种(3种水平横撑和1种"横撑+斜撑")临时横撑方案,采用ANSYS软件建立桥塔的空间有限元模型,模拟桥塔施工全过程,分析临时横撑和塔柱的位移和应力。结果表明:"横撑+斜撑"方案的临时横撑横向和竖向位移最小,受到的应力水平最低,最能有效控制桥塔的应力和变形。因此,采用"横撑+斜撑"方案。分析该方案下横撑对桥塔的位移和空间受力影响可知:塔柱的压、拉应力分别控制在10.0 MPa和0.7 MPa内;桥塔横桥向最大位移为7.8mm,倾斜度约为1/17 600,均满足施工要求。
[Abstract]:The main bridge of Qingshan Bridge in Nanning is a cable-stayed bridge with 430m main span. The bridge tower adopts reinforced concrete irregular arch structure, and the tower column is constructed by fully automatic hydraulic climbing formwork. Five temporary transverse braces are arranged along the direction of tower column height during construction. In order to effectively control the deformation and stress of the bridge tower during construction, four kinds of temporary transverse brace schemes (3 horizontal supports and 1 kind of "horizontal brace") were proposed. The spatial finite element model of the bridge tower was established by using ANSYS software to simulate the whole construction process of the bridge tower. The displacement and stress of temporary support and column are analyzed. The results show that the transversal and vertical displacement of temporary transverse brace is the smallest and the stress level is the lowest, which can effectively control the stress and deformation of the bridge tower. Therefore, we adopt the scheme of "horizontal brace oblique brace". By analyzing the influence of transverse brace on the displacement and spatial stress of the bridge tower under this scheme, it can be concluded that the column compression and tensile stress are controlled within 10.0 MPa and 0.7 MPa respectively, the maximum displacement of the bridge is 7.8 mm and the slope is about 1 / 17 600, which meets the construction requirements.
【作者单位】：中南大学土木工程学院;中铁四局集团第五工程有限公司;
【基金】：国家自然科学基金项目(51578547,51378501)~~
【分类号】：U445.4;U448.22

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