Research on mechanical properties and crack prevention of skew frame bridge
Practice has proven that using frame bridges for underpass railways is the best solution.When limited by terrain and road selection conditions,inclined frame bridges are more widely used.The mechanical characteristics of oblique frame bridges are complex,and in addition to the stress characteristics of orthogonal frame bridges,there are also torsional and warping deformations.This article takes the underpass railway oblique frame bridge as the research object,and conducts its mechanical performance analysis and crack prevention research.The framework bridge design assistance software DDQ and finite element ANSYS software were used to model the mechanical characteristics of the oblique frame bridge,with the oblique angle,length,and stem chamfer ratio as influencing factors.The research results indicate that the deflection of skew frame bridges increases with the increase of skew angle;When the skew angle is less than 30°,the stress characteristics of the frame bridge are close to those of an orthogonal frame bridge,and the transformation of stress and displacement with length is also small;When the skew angle is greater than 30°,the stress and displacement vary greatly with the length of the frame bridge;The chamfer ratio of the stem has a certain impact on the stress of the frame bridge,and the optimal chamfer ratio is 1∶1;Adopting software DDQ to design a skewed frame bridge with significant safety reserve performance.During the construction and design process,attention should be paid to structural cracks caused by uneven settlement of the foundation,and appropriate cement and aggregates should be selected.The concrete mix ratio should be designed reasonably to avoid temperature cracks.
万方数据
维普
