论文部分内容阅读
以重庆江津至贵州习水高速公路笋溪河特大桥为研究对象,从施工监控的角度,对悬索桥线形控制中影响成桥线形、无应力索长、索鞍预偏量以及空缆线形的参数进行分析研究,选取了计算方法、主缆弹性模量、主缆自重、加劲梁自重、环境温度作为重点研究参数,采用解析法与Midas/Civil相结合的研究方法。通过计算得出结论,计算方法对线形计算有较大影响,对于特大跨悬索桥应采用高精度的分段悬链线法和节线法;主缆弹性模量、加劲梁重量、环境温度对主缆成桥标高、空缆标高、无应力索长、索鞍预偏量等几项线形指标的影响最大,敏感度最高,是施工监控中需要重点关注的参数指标;为提高主缆线形和成桥线形的监控精度,在架设之前,对材料参数和荷载参数进行准确统计和测定;架设过程中,需重点监控环境参数的变化。
Taking Sunjiang River Expressway from Jiangjin in Guizhou to Xiushui River in Xishui Expressway of Guizhou as the research object, from the point of view of construction monitoring, the parameters influencing the bridge shape, stress-free cable length, cable saddle pre-deflection, The main research parameters are the calculation method, the elastic modulus of the main cable, the weight of the main cable, the self-weight of the stiffening girder and the ambient temperature, and the analytical methods combined with Midas / Civil are adopted. The conclusion is drawn that the calculation method has a great influence on the linear calculation. For the super-span suspension bridge, high-precision segmented catenary method and nodal method should be adopted; the main cable elastic modulus, stiffening girder weight, ambient temperature Cable-culvert elevation, aerial cable elevation, cable length without stress, saddle pre-deflection several linear indicators of the greatest impact, the highest sensitivity, is the construction monitoring of the need to focus on the parameters of indicators; in order to improve the main cable shape and into Bridge linear monitoring accuracy, before erection, material parameters and load parameters for accurate statistics and determination; erection process, the need to focus on monitoring changes in environmental parameters.