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为明确新型运架一体机对于桥梁结构的力学适用性,确保运梁架设过程中桥梁结构的安全,本文以新建沪昆线某高铁段特大桥群中四座标准跨径连续梁为工程背景,对新型运架一体机荷载作用下的结构响应进行计算,并与传统运梁车荷载作用下的结构响应进行对比分析。计算结果表明:1、运送32m简支梁时,虽然新型运架一体机荷载较传统运梁车大25%,但引起的桥梁结构支反力、弯矩以及位移均有不同程度的减小,支反力减小20%—25%,跨中弯矩减小20%—40%,梁体位移减小45%—75%;2、两种运梁车荷载作用下,连续桥梁最小安全系数为1.83,最大和最小正应力分别为14.1MPa和-1.6MPa,最大和最小剪应力分别为4.33MPa和-3.6MPa,最大主拉应力和最小主压应力分别为14.2MPa和-2.2MPa,均满足规范要求。
In order to clarify the mechanics applicability of the new type of integrated transporter to the bridge structure and ensure the safety of the bridge structure during the erection of the girder, this paper takes four standard cross-section continuous beams of a group of high-speed rail section super large bridge in Shanghai-Kunming Railway as the engineering background, The structure response under the load of the new type of carrier-integrated machine is calculated and compared with the structure response of the traditional carrier beam under the load. The results show that: 1, when the 32m simply supported girder is transported, although the load of the new integrated girder trucking machine is 25% larger than that of the traditional girder girder, the reaction force, bending moment and displacement of the bridge structure are all reduced in varying degrees, 20% -25% reduction of support reaction force, 20% -40% reduction of bending moment in midspan, and 45% -75% reduction of beam body displacement; 2. The minimum safety factor of continuous bridges Was 1.83, the maximum and minimum normal stresses were 14.1MPa and -1.6MPa respectively, the maximum and minimum shear stresses were 4.33MPa and -3.6MPa respectively, and the maximum and minimum principal compressive stresses were 14.2MPa and -2.2MPa respectively Meet the specification requirements.