摘要
为研究无背索曲塔曲梁斜拉桥施工中各参数变化的影响,对桥梁施工过程进行预控和参数误差识别,确保成桥时主梁和主塔位移、应力及拉索索力达到设计状态。以无背索曲塔曲梁斜拉桥—东莞水道桥为工程背景,采用MIDAS/CIVIL空间有限元分析软件,考虑结构重度、混凝土弹性模量、拉索弹性模量、温度作用等参数变化的影响,进行了各参数的敏感性分析。结果表明:主梁在y方向上变形的敏感参数为整体温度作用,在z方向上变形、主梁应力、塔顶位移、塔底应力以及拉索索力的敏感参数是整体温度作用和重度。整体降温时,主梁z方向最大位移增量为-12.2 mm,梁截面应力增量在上、下缘的左右侧相差较大,主梁的扭转明显;引起塔顶x、y、z方向的位移增量最值分别为7.4、3.2 mm和-21.3 mm,在塔底截面产生拉应力增量,最大值为7.28 MPa;整体降温和重度增加引起的索力增量最值分别为23.24 kN和18.11 kN,其中,整体降温时左、右侧对应拉索的索力增量表现出较大的差异。
In order to study the influence of parameters on curved-pylon and curved-girder cable-stayed bridge without back-stay during construction process, to precontrol the construction process and identify the parameter error, to ensure the deformation, stress of the beam and the pylon and of the cable force achieve the design value at the completion of the bridge construction, based on the construction of Dongguanshuidao bridge, which is a curved-pylon and curved-girder cable-stayed bridge without back-stay, the sensitivity analysis of parameters are performed through the finite element analysis software MIDAS/CIVIL considering the parameters change such as structural unit weight, concrete elasticity modulus, cable elasticity modulus and temperature action. The results show that （ 1 ） the sensitive parameter of the deformation of the beam in the y direction is temperature, the sensitive parameters of the deformation of the beam in the z direction, the stress of the beam, the deformation of the pylon top, the stress of the pylon bottom and the cable force are temperature and structural unit weight; （2） when temperature drops, the maximum deformation increment at the z direction of the beam is - 12. 2 mm, the differences of sectional stress increment at the left and right sides of upper and lower beam edges are greater, torsion of the beam is obvious ; （3） the extreme deformation increments of the pylon top in the x, y and z directions are 7.4, 3.2 and - 21.3 mm respectively, the tensile stress increment occurs at the bottom section of pylon, and the maximum value is 7.28 MPa; （4） the extreme cable force increment caused by temperature drop and unit weight increment are 23.24 kN and 18.11 kN respectively, the cable force differences of the same number cable between the left and right are lager.
出处
《公路交通科技》
CAS
CSCD
北大核心
2014年第2期54-59,68,共7页
Journal of Highway and Transportation Research and Development
基金
国家自然科学基金项目(51178051)
关键词
桥梁工程
钢-混组合梁
斜拉桥参数敏感性分析
有限元分析
无背索
曲塔
bridge engineering
steel-concrete composite beam
sensitivity analysis of parameters of cable- stayed bridge
finite element analysis
cable without back-stay
curved-pylon
