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自锚式悬索桥在荷载作用下,主梁端部承受主缆巨大的水平分力作用,为压弯构件,其稳定是个十分重要的问题。根据弹性支承梁屈曲失稳简化计算方法,推导了适用于空间索面的自锚式悬索桥主梁屈曲失稳简化计算公式,并以江东大桥为例,分别用简化计算方法和有限元法分析主梁稳定,在恒载下两种方法得到的失稳安全系数很接近,且简化公式计算偏于安全,验证了公式的可行性。
Self-anchored suspension bridge under load, the main beam end of the main cable to withstand the huge horizontal force component, as the bending member, the stability is a very important issue. According to the simplified calculation method of buckling instability of elastic supporting beam, the simplified calculation formula of buckling instability of main girder of self-anchored suspension bridge is deduced, which is suitable for space cable plane. Taking Jiangdong Bridge as an example, the simplified calculation method and finite element method The stability of the beam, the instability safety factor obtained by the two methods under constant load is very close, and simplifying the calculation of the formula is biased in safety, which verifies the feasibility of the formula.