【摘 要】
:
In order to study the transverse mechanics behavior of curved box girder with corrugated steel webs(CSWs),the transverse bending moment is obtained by integration about the longitudinal length through
论文部分内容阅读
In order to study the transverse mechanics behavior of curved box girder with corrugated steel webs(CSWs),the transverse bending moment is obtained by integration about the longitudinal length through the transverse normal stress expression of the upper and lower edges of the roof of the box girder.And the transverse bending moment and effective width of the roof are adopted to reflect these indexes.The results of study show that: when the radius of curvature increases,the transverse bending moment and the effective distribution width of the roof root on the inner side of box girder are reduced,and the ratios are more than two times.Moreover,the finite element(FE)value of the transverse bending moment of box girder transverse midspan is less than the theoretical value in the case of simple support,accounting for about 0.91,this shows that the bending moment coefficient 0.7 of Chinese bridge code is not applicable for curved box girder with CSWs.With the increase of the radius of curvature,the transverse bending moment and effective width of the roof root at the outer side of the box girder show a decreasing trend,and the ratios are more than 1.1 times.Thus,two working conditions,the load is located at the roof interior root of the midspan section of the box girder and the load acts on the outermost side of midspan section of the box girder,have the greatest influence on the transverse performance of curved bridge with CSWs.
其他文献
在役桩基的桩长和完整性检测是桩基检测中的难题。与常规反射波法相比,旁孔透射波法信号强、干扰少,具有良好的应用前景。本文通过建立三维有限元模型,采用旁孔透射波法对在役桥梁基桩的长度进行了模拟分析。通过不同深度处的首至波走时,研究了激振方向、激振距离和旁孔距对首至波时深曲线的影响;通过对首至波时深曲线进行分段线性拟合,探讨了三种计算桩底深度方法的合理性。结果 表明:激振方向、激振距离对桩底计算深度的影
本文设计了跨径3×25m 装配式钢-UHPC 组合连续梁桥,并与同等跨径装配式钢-普通混凝土组合梁桥、预应力T 梁桥进行了技术经济性对比。结果 表明:钢-UHPC 组合梁桥较钢-普通混凝土组合梁桥、预应力T 梁桥恒载自重分别降低30%和50%;钢-UHPC 组合梁单位吊装重量比钢-普通混组合梁桥、预应力T 梁桥小约30%和53%,易于装配式施工,具有广阔的应用前景。
大跨钢管混凝土拱桥钢拱肋多采用斜拉扣挂法架设,扣索张拉值对拱肋松索成拱后的内力和线形影响极大。为避免施工中反复调索的繁琐工作,同时保证钢拱肋松索成拱后线形满足期望要求,基于零阶优化法,运用大型有限元分析软件ANSYS,开展钢管拱肋扣索一次张拉索力优化研究。提出在各迭代子步中对程序自动搜索值进行宏观调整的改进算法。算例表明:改进算法可提高迭代效率和计算精度,按优化出的索力和预抬量进行施工控制,钢拱肋
本文在深入研究《公路隧道和地道照明指南》(CIE88-2004)的基础上,分析比较《公路隧道照明细则》和《公路隧道通风照明设计规范》在隧道照明设计思想及方法上的不同。并结合具体的隧道采用《细则》方法进行照明优化设计,将设计所得结果与根据原《规范》所得结果比较。说明采用CIE 隧道照明的设计思想,不仅符合隧道行车的视觉适应特点,亦利于隧道照明节能,从隧道照明的舒适性与节能性均体现了《细则》的先进性。
In this report,an experimental program to test reinforced concrete(RC)slabs subjected to the combination of fire and explosive loads was planned.This project was conducted as part of the submerged flo
In this study,main types and distribution laws are attained based on field survey and statistical analysis from a plenty of multiple-arch tunnels in Yunnan province.Main influencing factors of lining
在大跨径连续体系和柔性体系桥梁中,传统钢-混凝土组合梁结构存在着两方面难题:其一,混凝土抗拉强度低导致负弯矩区混凝土容易受拉开裂;其二,因自重较大,传统组合梁应用于(特)大跨径桥梁时并不经济。为了解决上述难题,本文提出了钢-超高性能混凝土UHPC(Ultra High Performance Concrete)轻型组合桥梁结构,利用轻薄的UHPC 桥面板代替传统组合梁中较厚的混凝土桥面板,既可减轻
随着高速公路建设里程的增长,山区高速公路穿越崇山峻岭、隧道施工中岩溶、富水、瓦斯等复杂地质在施工中越来越多,为了保证岩溶富水长大隧道施工安全,本文就施工过程中安全有效的施工方法和过程中的一些控制关键技术进行分析,确保山区高速公路岩溶富水长大隧道施工的安全,为今后长大隧道领域的施工起到一定的参考价值。
Corrosion of reinforcing steel leading to structural deterioration and failure of reinforced concrete structures is a serious problem for port and highway agencies,and facility owners.Corrosion of rei
基于车-桥耦合振动,以一下承式钢桁梁为例,采用灵敏度方法分析了桥梁与车辆响应对于桥梁整体损伤的敏感性,结果表明桥梁响应对损伤的敏感性远大于车辆响应,且桥梁跨中节点加速度响应对损伤最为敏感。基于此提出了一种基于桥梁单测点加速度响应互相关函数的灵敏度损伤识别方法,通过观测桥梁结构损伤前后某一测点的相关函数变化,使用灵敏度方法来识别桥梁结构损伤。通过数值模拟对该方法进行了验证,结果表明:使用单测点加速度