鋼筋混凝土箱梁頂板橫向受力有效分布寬度的塑性分析
[Abstract]:In order to study the transverse force characteristics of the common reinforced concrete box girder in plastic stage, the effective distribution width of the transverse force on the box girder roof is obtained, and two test models of the reinforced concrete box girder are made. On the top of the concrete box girder, the plastic hinge distribution form and the limit load are obtained by observing the whole process of the concrete box girder roof from cracking to failure. Based on the failure mode of two roof plates, the plastic analysis model of box girder roof is proposed. Based on the limit analysis of plastic hinge theory, the formula for calculating the limit load and the effective distribution width of plastic transverse force on the roof of reinforced concrete box girder under local load is derived, and the applicability of the formula is verified by the test results. Finally, the test results and theoretical values are compared with the values of the relevant bridge design codes at home and abroad. The results show that the limit equilibrium method can be used to determine the ultimate bearing capacity and the effective distribution width of plastic transverse force on the roof of reinforced concrete box girder. The simplified failure mode proposed in this paper can carve out the transverse force characteristics of the reinforced concrete box girder roof in the plastic stage, and after the box girder roof plate enters the plastic stage under the local load, The effective distribution width of the transverse force is obviously different from that of the elastic stage, and the effective distribution width of the transverse force on the roof of the box girder under the limit state is about 2 times that of the elastic solution.
【作者單位】: 湖南大學(xué)土木工程學(xué)院;湖南工業(yè)大學(xué)土木工程學(xué)院;
【基金】:國家自然科學(xué)基金項目(51278182)
【分類號】:U441
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