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由于目前曲线桥抗倾覆稳定性设计尚未有统一标准,禁止支座脱空和抗倾覆稳定系数大于2.5均可以用作曲线桥梁的抗倾覆稳定性满足要求的判别标准,在此基础上本文引入了新的稳定性系数等效计算公式并与前两种设计方法进行对比。基于某公路钢-混组合曲线梁桥建立空间有限元模型,通过对设计荷载和实际车队荷载进行最不利布置,计算其抗倾覆稳定性系数并进行对比。研究结果表明:设计荷载和实际车队荷载作用下此桥均满足抗倾覆的要求,但是后者作用下的稳定系数较小;以禁止支座脱空系数大于1来进行抗倾覆稳定设计更安全;引入的抗倾覆稳定系数等效计算方法更为简便、实用。
Due to the fact that there is no uniform standard for anti-overturning stability of curvilinear bridges at present, the stability of anti-overturning can not be used as a criterion to meet the requirements of anti-overturning stability of curved bridges. The article introduces The new equivalent coefficient of stability coefficient is compared with the first two methods. Based on the steel-concrete composite curved beam bridge of a highway, a finite element model was established. By calculating the most unfavorable layout of design load and actual fleet load, the stability coefficient of anti-overturning was calculated and compared. The results show that this bridge meets the requirements of anti-overturning under the design load and the actual fleet load, but the stability coefficient is small under the latter. It is safer to forbid the over-cooling coefficient of the support to be greater than 1, The equivalent calculation method of anti-overturning stability coefficient introduced is more simple and practical.