【摘要】 研究在不同荷载作用和截面布置情况下,钢管-钢骨高强混凝土的破坏模式及抗弯承载力计算方法.根据构件在不同状态下的中和轴位置和3种材料的应力-应变关系,确定了9种破坏模式.考虑到钢管增强了混凝土的约束效应,在已有钢骨高强混凝土的抗弯承载力计算方法的基础上,通过采用极限状态叠加法,推导出对称和非对称组合构件在纯弯状态下的受压区高度和承载力计算公式.计算结果与已有文献数据吻合较好,表明极限状态叠加法可以应用于该种组合构件,并适用于不同截面的配置情况.更多还原

【Abstract】 Studies theoretically the failure modes and calculation of the flexural bearing capacity of steel tube members filled with bar-reinforced high-strength(HS) concrete under different loadings with different sectional layouts.According to the different positions of neutral axis and stress-strain relationship of 3 kinds of materials,9 failure modes are ascertained.Based on the existing calculation of flexural bearing capacity of bar-reinforced HS concrete and taking account of the strengthened constraining effect of steel tube on concrete,the formulae of the height of compression zone and flexural bearing capacity are deduced by superposition method in limiting state for both symmetric and asymmetric composite members in pure bending state.The calculated result conforms well to earlier works and shows that the superposition method used is available and suitable for different sectional layouts.更多还原