钢-UHPC轻型组合梁桥面板结构型式研究
发布时间：2019-01-12 15:38
【摘要】：提出了钢—UHPC轻型组合桥梁结构,以克服传统钢-混凝土组合结构桥梁混凝土桥面板的不足。(1)从基本力学性能和经济性方面对轻型组合梁和传统组合梁进行对比,表明轻型组合梁具有自重低,力学性能优越,施工方便快捷,全寿命经济效益显著等特征,具有较好的应用前景。(2)对等厚板、带纵肋桥面板、华夫桥面板3种结构型式的UHPC桥面板进行有限元分析,结果表明:华夫桥面板竖向位移最小,整体刚度最大;带纵(横)肋桥面板仅纵肋下缘纵向拉应力最大,只需在纵肋下缘配置纵向受拉钢筋;华夫桥面板方案横向拉应力峰值小于较带纵肋方案。(3)基于华夫桥面板方案开展了足尺条带模型试验,正负弯矩试验的初裂应力分别为19.4 MPa和9.1 MPa,华夫桥面板方案能够满足正常使用极限状态的裂缝限值。
[Abstract]:In order to overcome the shortcomings of traditional steel-concrete composite structure concrete deck slab, the steel-UHPC light-duty composite bridge structure is proposed. (1) the light composite beam and the traditional composite beam are compared in terms of basic mechanical properties and economy. The results show that the light composite beam has the characteristics of low deadweight, superior mechanical properties, convenient construction, remarkable economic benefit and so on. It has a good application prospect. (2) the uniform thick plate, the bridge deck with longitudinal rib, etc. The finite element analysis of UHPC deck slab with three types of structure shows that the vertical displacement of Wafu deck slab is the smallest and the overall stiffness is the largest. The longitudinal tensile stress of the bridge floor with longitudinal (transverse) rib is the largest only at the lower edge of the longitudinal rib, and only longitudinal tensile reinforcement should be arranged at the lower edge of the longitudinal rib. (3) the full-scale strip model test was carried out based on the Wafu bridge deck scheme, and the initial crack stress of positive and negative moment test was 19.4 MPa and 9.1 MPa, respectively. The Wafer bridge deck scheme can meet the crack limit of the normal service limit state.
【作者单位】： 湖南大学土木工程学院;山西省交通科学研究院桥梁工程防灾减灾山西省重点实验室;湖南大学风工程与桥梁工程湖南省重点实验室;湖南省交通规划勘察设计院;
【基金】：国家自然科学基金(51378194) 交通运输部重大科技专项(2011318494160) 湖南省交通运输厅科技创新项目(201437)
【分类号】：U443.31
本文编号：2407938
[Abstract]:In order to overcome the shortcomings of traditional steel-concrete composite structure concrete deck slab, the steel-UHPC light-duty composite bridge structure is proposed. (1) the light composite beam and the traditional composite beam are compared in terms of basic mechanical properties and economy. The results show that the light composite beam has the characteristics of low deadweight, superior mechanical properties, convenient construction, remarkable economic benefit and so on. It has a good application prospect. (2) the uniform thick plate, the bridge deck with longitudinal rib, etc. The finite element analysis of UHPC deck slab with three types of structure shows that the vertical displacement of Wafu deck slab is the smallest and the overall stiffness is the largest. The longitudinal tensile stress of the bridge floor with longitudinal (transverse) rib is the largest only at the lower edge of the longitudinal rib, and only longitudinal tensile reinforcement should be arranged at the lower edge of the longitudinal rib. (3) the full-scale strip model test was carried out based on the Wafu bridge deck scheme, and the initial crack stress of positive and negative moment test was 19.4 MPa and 9.1 MPa, respectively. The Wafer bridge deck scheme can meet the crack limit of the normal service limit state.
【作者单位】： 湖南大学土木工程学院;山西省交通科学研究院桥梁工程防灾减灾山西省重点实验室;湖南大学风工程与桥梁工程湖南省重点实验室;湖南省交通规划勘察设计院;
【基金】：国家自然科学基金(51378194) 交通运输部重大科技专项(2011318494160) 湖南省交通运输厅科技创新项目(201437)
【分类号】：U443.31
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