钢筋混凝土拱桥结构受力与施工控制参数敏感性分析  

Sensitivity Analysis of Structural Stress and Construction Control Parameters of Reinforced Concrete Arch Bridge

作　　者：马记[1] MA Ji(Shaanxi Railway Institute,Weinan 714000,China)

机构地区：[1]陕西铁路工程职业技术学院,陕西渭南714000

出　　处：《粉煤灰综合利用》2021年第2期117-122,共6页Fly Ash Comprehensive Utilization

摘　　要：针对当前方法分析钢筋混凝土拱桥结构参数敏感性时,未考虑计算温度场和收缩徐变参数,导致敏感性分析结果存在的误差较大,影响钢筋混凝土拱桥结构的使用安全的问题,提出了钢筋混凝土拱桥结构受力与施工控制参数敏感性分析。根据流入微分体的净热量,结合混凝土内部温度场控制方程,计算钢筋混凝土拱桥结构温度场,利用灰色关联分析法,计算钢筋混凝土收缩徐变量,将作用在钢筋混凝土拱桥上的支撑力作为集中力,得到钢筋混凝土拱桥的挠度和内力,根据应力与挠度的关系,获得最终钢筋混凝土的荷载,获取钢筋混凝土的荷载传递规律,实现对拱桥结构受力、施工控制参数的敏感性分析。试验结果表明:本文方法的钢筋混凝土容重与弹性模量以及摩擦系数的挠度变化较大,钢筋混凝土拱桥结构受力以及施工控制参数敏感性变化量较大,敏感性分析结果误差较小。When the current method analyzes the sensitivity of reinforced concrete arch bridge structure parameters,it does not consider the calculation of temperature field and shrinkage and creep parameters,which leads to large errors in the sensitivity analysis results and affects the safety of the use of reinforced concrete arch bridge structures.Reinforced concrete is proposed Sensitivity analysis of arch bridge structure stress and construction control parameters.According to the net heat flowing into the differential body,combined with the control equation of the internal temperature field of the concrete,the temperature field of the reinforced concrete arch bridge structure is calculated.The gray correlation analysis method is used to calculate the shrinkage and creep variables of the reinforced concrete,and the supporting force acting on the reinforced concrete arch bridge is used as the concentrated force.Obtain the deflection and internal force of the reinforced concrete arch bridge,obtain the final reinforced concrete load according to the relationship between stress and deflection,obtain the load transfer law of reinforced concrete,and realize the sensitivity analysis of the arch bridge structure stress and construction control parameters.The test results show that the deflection of the reinforced concrete bulk density,elastic modulus and friction coefficient of the method in this paper has a large change,and the stress of the reinforced concrete arch bridge structure and the sensitivity of construction control parameters have a large change,and the sensitivity analysis results have small errors.

关 键 词：钢筋混凝土 拱桥结构 受力 施工控制 敏感性 

分 类 号：U448.27[建筑科学—桥梁与隧道工程]