![]() Without reflecting all these time dependent variables, analysis results will deviate considerably from the true behaviors. KEYWORDS: Pre-tensioning, Pre-stressing, I Girder, Bridge. In addition, bridges constructed by ILM are affected by time dependent material properties such as concrete strength (elasticity of modulus), creep and shrinkage. Check on to specify the radius of a curved bridge with a single curvature, which applies to both main girder and launching nose. Reduced stress and deviation rates compared to a straightforward tender profile. According to the calculation results, the maximum combined stress of the bridge i. The geometry, support condition and loading condition of the temporary structure of each stage vary from one stage to the next, without having any resemblance to the finally completed structure. Strength check stress diagram of bridge decki-beam (unit: MPa). The structural system continuously changes during the construction stage. Each current prefabricated segment is post-tensioned with the previously erected box girder segments and pushed in the direction of the bridge by launching equipment, which consists of a combination of hydraulic jacks acting vertically and horizontally and sliding bearings. The basic concept of Incremental Launching Method (ILM) is that approximately 15 to 30m long units of bridge segments are prefabricated under plant conditions behind an abutment and launched by means of sliding (on Teflon bearings), one segment at a time.
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