The Old Bridge Specification Is Designed To Calculate The Comparative Study

As the bridges play an important role in the highway traffic, the bridge engineering has developed into a systemic course including the academic analysis, structure designing, construction controlling and project management subjects.With the economic development and the increment of the traffic, the damages and the disfigurements appear in the existing bridge structures, which have been badly interfering the normal use of the existing bridge structures. Therefore, it is quite important to do the detecting, evaluating, repairing and servicing work relating to the existing bridge structures.Most of the bridges have been designed according to the old bridge criterion (JTJ023-85), comparing with the old one, the new criterion (JTGD62-2004) has made greater changes in the value of the material properties, designing formulas and the calculations of the action effect. To evaluate the qualities of the existing bridges, we should apply the new bridge criterion. So this dissertation provides certain rules and evidences for the evaluable work by comparing the old and new criterions.This dissertation takes the pre-stressed reinforced concrete hollow slab as an example, which has been widely used in HeNan province. On the basis of the old and new criterions (JTJ023-85 and JTGD62-2004), this dissertation contains the calculations of the bending bearing capacities of the front section and the slanting section and the cracking moment. In addition to this, the action effect and the consumption of the materials are also included in this dissertation . By comparing the two different kinds of the calculation results, the author provides some certain analysis. Combining the pre-stressed reinforced concrete hollow slab, the dissertation evaluates the different permitted bearing capacities of the bridge designed according to the old and new criterions.