【摘要】 宽度与跨度之比B/L>1的桥梁一般称之为特宽桥,其受力与普通窄桥有所不同。对一座B/L>1的下承式钢筋混凝土系杆拱桥建立空间有限元计算模型,对其进行静、动力分析,并与平面静力计算分析进行了比较。通过静力计算比较,发现平面计算的内力比空间计算的内力大,但是,平面计算不能反应拱肋和系梁的扭矩;通过动力分析,发现特宽拱桥横向刚度比纵向刚度和竖向刚度小,其横向地震响应相对较大。通过计算分析发现,对于特宽桥梁,应采用空间分析才能满足计算的精度,才能发现一些平面分析无法发现的问题,对于特宽拱桥,尤其要注意其横向刚度的处理。更多还原

【Abstract】 A super-wide bridge is one whose width-span ratio is greater than 1.0,which forcing characteristic is different from ordinary bridges.Spatial finite element modal is built for a reinforced super-wide bridge,and its static and dynamic spatial finite element analysis is made.By comparison between spatial analysis and plane analysis,it is find that inner force from plane analysis is greater than that of spatial analysis,but torque of arch rib and tie bar cannot obtained from plane analysis.Through dynamic analysis,it is find that stiffness of cross direction is less than that of longitudinal and vertical direction for super-wide arch bridge,and the lateral earthquake response is greater than that of other directions.It is indicate through calculations and analysis that,spatial analysis must be made for super-wide bridges in order to meet the precision of calculation,some deficiency can only find through spatial analysis,and lateral stiffness of super-wide arch bridge must be pay attention to.更多还原