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After describing the diseases on hinge joints of the hollow plate and analyzing causes, eight reinforcement measures are put forward and introduced herein accordingly. By means of solid finite element analyzing method, the article conducts a contrastive analysis on a variety of working conditions of those eight reinforcement measures, including the hinge joint stress and transverse distribution parameter. Three ideal methods are selected to conduct further analysis on the reinforcement effect of the hinge joint stress and it is concluded that there is risk in one way steel beam hinge joint reinforcement and two ideal methods are two-way steel beam reinforcement and adding transverse diaphragm in precast phase. From the perspective of fundamental solution to hinge joints, two-way reinforcement exerts more obvious effect on the bridges in service while adding transverse diaphragm is better for newly built bridges. Making it easy for design and construction, this paper offers constructive reference for engineering practice by deducting the vertical arrangement distance of the steel beam, presenting needs to be met by the shear resistance and flexural bearing capacity after verifying reasonable distance, discussing numbers and distance of transverse diaphragm and summarizing the strain of the external prestressed steel beam.

For low price bidding method, how to detect the cost price has been the research difficulty and hot. Effective detection method of combination entropy decision and fuzzy risk evaluation was proposed.According to each construction unit’ project bidding risk index systems, using entropy proportion method to determine the weights, and then through the project risk fuzzy evaluation model, fuzzy comprehensive evaluation of risk value, and finally according to the size of risk value in order to determine the level of profits, and the cost was determined. The effectiveness was validated through the practical engineering cases. The method opened up that judge bidding price whether lower than the cost. While overcoming the only pursuit of winning the bid in the lowest price, regardless of the disadvantages whether lower than the cost.

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