长悬臂混凝土箱梁翼缘板荷载有效分布宽度计算分析

Analysis of Load Effective Width of Long Cantilever Concrete Box Girder Flange Plate

长悬臂混凝土箱梁由于增加了翼缘板的长度,采用我国规范的荷载有效分布宽度进行翼缘板受力计算将造成配筋与实际不符。以有限元为基础,采用大型有限元ANSYS软件建立不带边梁全箱梁模型以及带边梁全箱梁模型,考虑翼缘板长度、厚度以及荷载作用位置在不同坡度的情况下,进行荷载有效宽度计算对比分析,结论表明,长悬臂翼缘板的边梁效应不容忽略。并根据最小二乘法原理,利用Matlab软件拟合得出不带边梁全箱梁模型和带边梁全箱梁模型翼缘板荷载有效宽度的计算公式,为翼缘板配筋计算提供帮助。

Since the long cantilever concrete box girder increases the length of the flange plate, using the load effective width of flange plate from Chinese code to calculate stress will cause reinforcement not to tally with the actual condition. On the basis of finite element, large finite element software ANSYS is used to establish box girder model without boundary beam and box girder model with boundary beam. With different flange plate length and thickness and with load position at different slope, the load effec- tive widths are calculated to make a comparison and analysis. The conclusion shows that responses of boundary beams of long cantilever flange plate should not be ignored. Based on the principle of least square method, the Matlab software is used to fit the formula of load effective width of flange plate of the box girder model without boundary beam and box girder model with boundary beam, giving help to its reinforcement design.