单箱多室宽箱梁的翼缘有效宽度取值研究

发布时间：2018-05-25 04:36

本文选题：公路桥梁 + 有效翼缘宽度　；参考：《铁道建筑》2017年10期

【摘要】：以南宁大桥引桥为例,分别采用中国公路桥梁规范、美国AASHTO规范和有限元分析方法对比研究了桥梁在自重和移动荷载作用下典型截面的翼缘有效宽度。计算结果表明:在自重和对称移动荷载作用下,对于连续梁边跨和中跨跨中截面,翼缘有效宽度沿横桥向分布比较均匀,按中国规范得到的翼缘有效宽度相对误差在11%以内,而按美国规范计算的相对误差在10%~27%;对连续梁支点截面,按中国规范得到的翼缘有效宽度取值偏于保守,最大相对误差达40%,而按美国规范所得结果偏于不安全,相对误差达-38%;在偏载作用下,翼缘有效宽度沿横桥向变化较大,按中国规范得到的翼缘有效宽度在边跨和中跨跨中截面比实际要大,而美国规范相对保守。
[Abstract]:Taking the approach bridge of Nanning Bridge as an example, the effective width of flange of typical section of the bridge under dead weight and moving load is studied by using Chinese highway bridge code, American AASHTO code and finite element analysis method respectively. The calculated results show that the effective width of the flange is uniformly distributed along the transverse direction of the bridge under the action of deadweight and symmetrical moving load, and the relative error of the effective width of the flange obtained according to the Chinese code is less than 11%, for the middle section of the edge span and the middle span of the continuous beam, the effective width of the flange is distributed evenly along the transverse direction of the bridge. For the fulcrum of continuous beams, the effective width of the flange obtained according to the Chinese code is conservative and the maximum relative error is 40 percent, while the results obtained according to the United States Code are not safe. Under partial load, the effective width of flange varies greatly along the transverse bridge. The effective width of flange obtained according to Chinese code is larger than that of actual cross section of side span and middle span, while the American code is relatively conservative.
【作者单位】：兰州交通大学甘肃省道路桥梁与地下工程重点实验室;
【基金】：国家自然科学基金(51368031) 甘肃省基础研究创新群体项目(1506RJIA029)
【分类号】：U448.213

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