大跨连续梁中横梁横向钢束对人孔受力的影响分析

Analysis on Influence of Transverse Steel Bundles of Middle Crossbeam on Stress of Manholes in Long-span Continuous Beams

摘要:

某高架桥采用60 m+105 m +105 m +60 m连续梁结构，采用悬臂施工方式，中横梁受力较为复杂。在中横梁设计时，通常会在中横梁处增设人孔以满足检修人员通过，但人孔的设置会改变中横梁的应力分布，使得人孔周边出现较多拉应力区域。在一般设计时，会在人孔周边配置一定的横向钢束来解决该问题。采用ANSYS有限元软件，建立中横梁实体模型，对计算结果进行分析。结论认为，可通过改变人孔尺寸来分析人孔周边应力的分布情况。

Abstract:

A 60 m+105 m+105 m+60 m continuous beam structure is used in an elevated bridge with the cantilever construction method. The stress on the middle crossbeam is relatively complex. Usually, in the design of the middle crossbeam, a manhole is added to meet the needs of maintenance personnel. However, the setting of the manhole will change the stress distribution of the middle crossbeam, resulting in more tensile stress areas around the manhole. In the general design, a certain transverse steel bundle will be installed around the manhole to solve this problem. The ANSYS finite element software is used to establish a solid model of the middle crossbeam to analyze the calculation results. The conclusion shows that the distribution of stress around the manhole can be analyzed by changing the size of the manhole.