| Reinforced concrete and prestressed concrete slabs bridge is widely application，as forits better structure performance, convenient construction and easy to mass industrializedprecast etc. But recent years, Due to the factors of vehicles overloading, unreasonable localdesign, and so on, cracking on plate beam bottom has become one of the primary problemsin plate-beam bridge operations. Ever used by the sticking steel slab technology, steelproducts utilization rate is low, the reinforcement effect is not ideal. According to theprinciple that the increase of the primary beam flexural stiffness can decrease the maximumvertical deflection and internal forces of the primary beam under the same load, andeventually reduce the beam bottom cracks, the author proposed the π-type steelstrengthening technology. Considering our domestic blank for researching of the π-typesteel strengthening technology，the authors carry out the nonlinear finite-element numericalsimulation by means of ANSYS to analysis and research on the various properties of theπ-type steel strengthening technology.The main several aspects of this study as follows:(1) Compare the effect on improving the internal forces of the primary beam, reducingthe main span scratch, controlling beam bottom transverse cracking of differentstrengthening methods to show the advantage of π-type steel strengthening technology.(2) Compare the effect on improving the internal forces of the primary beam, reducingthe main span scratch, controlling beam bottom transverse cracking of using weds ofdifferent heights, weds of different thickness and weds of different thickness ratio. Byanalyzing the influence of different factors on the π-type steel reinforcement effect, designideas of the n-type steel section is proposed.(3) By analyzing the structural stability when π-type steel of different thickness ratioapplies to different span main beam, the specific scope is proposed. The appropriate designcriteria of the n-type steel section are proposed. |
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