涵洞建筑结构移动载荷优化设计仿真
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摘要
对涵洞建筑结构移动载荷的优化能够有效预防道路和堤坝工程中涵洞建筑存在的难点问题。在优化建筑结构时需要计算出压力集中系数,得到涵洞填土高度和顶部压力值的变化关系。传统方法主要通过计算涵洞顶部在移动载荷下的附加土压力实现移动载荷优化,但是无法得到填土高度和顶部压力值的变化关系,导致优化效果不理想。提出基于有限元分析的移动载荷下涵洞垂直土压力极限分析方法,首先结合土压力理论,从涵顶平面内外土柱沉降差综合参数入手,将增加的模型填土高度重量视为载荷,然后通过分析垂直土压力极限分析法,给出填土高度小于等沉面高度时涵顶土柱与四周土体的相互剪切力,得到涵洞填土高度和涵洞顶部垂直土压力值的变化关系,计算出涵洞顶部垂直土压力的上限解。仿真结果表明,所提方法对涵洞建筑结构移动载荷的优化效果较好。
An ultimate analysis method for vertical soil pressure of culvert under moving load is proposed based on the finite element analysis. Firstly,the method starts with the comprehensive parameters of differential settlement between internal and external earth-pillar in the top culvert plane,and uses the increasing model filling height weight as the load. Then,it gives out the mutual shear force between culvert top earth-pillar and all around soil body during the filling height is less than the equal settlement plane height. Moreover,it obtains the changing relationship of culvert filling height and vertical soil pressure value of culvert top. Finally,it works out the upper-bound solution of top vertical soil pressure. The simulation results show that the method has good optimization effect.
An ultimate analysis method for vertical soil pressure of culvert under moving load is proposed based on the finite element analysis. Firstly,the method starts with the comprehensive parameters of differential settlement between internal and external earth-pillar in the top culvert plane,and uses the increasing model filling height weight as the load. Then,it gives out the mutual shear force between culvert top earth-pillar and all around soil body during the filling height is less than the equal settlement plane height. Moreover,it obtains the changing relationship of culvert filling height and vertical soil pressure value of culvert top. Finally,it works out the upper-bound solution of top vertical soil pressure. The simulation results show that the method has good optimization effect.
引文
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[10]曹成涛.城市交叉口交通信号优化控制方法.[J].西安工程大学学报,2016,4(30):616-621.
[2]赵建斌,申俊敏,董立山.高填方涵洞受力特性现场测试及数值模拟研究[J].郑州大学学报(工学版),2014,35(3):111-115.
[3]李盛,等.黄土地区高填土明洞土拱效应及土压力减载计算[J].岩石力学与工程学报,2014,33(5):1055-1062.
[4]李伟建,郑晴.爆炸冲击载荷作用下混凝土墙动态响应分析[J].计算机仿真,2016,33(2):27-31.
[5]李祝龙,等.高填方路基钢波纹管涵洞分层土压力分析[J].中外公路,2014,34(1):40-44.
[6]邱洪志,等.车辆载荷对支护桩主动土压力的影响分析[J].岩土工程学报,2016,38(3):486-493.
[7]王明珉,王桂林,吴曙光.地震作用下桩间挡土构件主动土压力极限分析方法[J].岩土工程学报,2015,37(12):2301-2307.
[8]王雯璐,赵大军.考虑分布角法的沿涵洞纵向竖向土压力分析和试验[J].中外公路,2014,34(6):12-15.
[9]马强,等.具有硬壳层的涵洞地基极限承载力分析[J].郑州大学学报(工学版),2016,37(1):70-74.
[10]曹成涛.城市交叉口交通信号优化控制方法.[J].西安工程大学学报,2016,4(30):616-621.