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在６根两等跨钢－火山渣混凝土连续组合梁的试验基础上，应用截面转换法，提出此类梁负弯矩区极限抗弯承载力计算公式；该方法无需判断组合截面中性轴的位置，并且避免了按照传统方法计算当中性轴位于钢梁上翼缘时计算结果过于保守的问题；当中性轴住于钢梁上翼缘时该方法能够给出计算简便且与试验值吻合较好的计算结果。
On the basis of the experiment of six two-span steel-volcanic concrete continuous composite beams, the formula of ultimate bending capacity in negative moment area of such beams is proposed by the method of section transformation. The method does not need to judge the neutral axis And avoids the problem that the calculation result is too conservative when the neutral axis is located on the upper flange of the steel beam according to the traditional method. When the neutral axis is on the upper flange of the steel beam, the method can give the calculation result which is easy to calculate and in good agreement with the experimental value .