现代斜拉桥不同截面形式的剪力滞效应分析

针对斜拉桥3种典型截面形式如闭口箱形、边箱形和边主肋形,分别采用不同的理论计算方法,如三杆比拟法、弹性理论解法和能量变分法等对其主梁截面剪力滞效应进行分析,并结合有限元数值计算和模型试验的分析结果进行了对比验证。结果表明:该理论计算方法较为简便直观且具有一定的精度,其计算结果偏于安全,可以用于初步设计;计算分析和模型试验研究相结合的方法是分析评议斜拉桥主梁截面剪力滞效应的有效手段。

Theoretical Analysis of Shear-lag Effect of Modem Cable-stayed Bridge with Different Cross Sections

According to three representative forms of cable-stayed bridge cross section,including traditional box cross section,side-box cross section and side-main-web cross section,different corresponding theoretical methods are studied such as the three-bar simulation method,the elastic theoretical solution method and the principle of minimum potential energy method.Moreover,finite-element method and model test method are compared with the theoretical method mentioned above.And the comparison shows that though the theoretical results are bigger than FEM and model-test results,it is appropriate and convenient for each theoretical method with some precision to analyze corresponding cross section,which can guide cable-stayed bridge principle design in the future.Besides,it is efficient to assess the shear-lag effect of cable-stayed bridge by combining numerical analysis with model test.