顺几河大桥荷载试验与承载能力评估

发布时间：2019-02-16 18:08

【摘要】：为了评价顺几河大桥的技术状况和承载能力,抽取其中的4跨连续梁进行了静载试验。试验测试了控制截面上各测点的应变和挠度值,并与相应的理论计算值进行了比较。结果表明:所有工况下求得的荷载效率系数值均介于0.95~1.05之间;各试验工况下,T梁测试截面实测应力校验系数介于0.46~0.92之间,各测点的挠度校验系数介于0.35~0.78之间,该桥的结构强度和刚度具有一定的富余度,能较好满足实际运营;控制截面上多数测点的相对残余应变和挠度值为0,结构的多数位置均处于弹性工作状态,部分应变和挠度测点出现残余应变和挠度,其相对最大值分别为17.4%,16.7%,表明该桥在试验荷载下无较大不可恢复变形;结构整体的横向连接可靠,刚度分配均匀,技术状况和承载能力能够满足正常使用要求。
[Abstract]:In order to evaluate the technical condition and bearing capacity of Shunji River Bridge, four span continuous beams were selected for static load test. The strain and deflection values of each measuring point on the control section are tested and compared with the corresponding theoretical calculation values. The results show that the load efficiency coefficient obtained under all working conditions is between 0.95 and 1.05; Under each test condition, the measured stress check coefficient of T beam section is between 0.46 and 0.92, and the deflection coefficient of each measuring point is between 0.35 and 0.78. The structural strength and stiffness of the bridge have a certain degree of surplus. Can better meet the actual operation; The relative residual strain and deflection of most of the measured points on the control section are 0, and most of the positions of the structure are in the elastic state. The relative maximum values of the residual strain and deflection at the partial strain and deflection measuring point are 17.4 and 17.4, respectively. The result shows that there is no large unrecoverable deformation of the bridge under test load. The transverse connection of the whole structure is reliable, the stiffness distribution is uniform, and the technical condition and the bearing capacity can meet the requirements of normal use.
【作者单位】：西南交通大学土木工程学院;云南省公路科学技术研究院;
【基金】：国家自然科学基金项目(51308471)
【分类号】：U446

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