【摘要】 为解决组合箱梁横向裂缝对结构安全的潜在影响，利用ABAQUS程序建立钢-工程水泥基复合材料(Engineered Cementitious Composite,简称ECC)组合箱梁的数值模型，揭示钢-ECC组合箱梁在受力过程中剪力滞的变化，并分析剪力滞效应的影响因素。研究结果显示，随着荷载增大，钢-ECC组合箱梁的剪力滞效应逐渐加剧，但当ECC翼缘板应变达到极限状态时，剪力滞效应开始趋于稳定。通过适当降低翼缘板的宽度与厚度，或增大箱梁腹板的高度，可以有效减轻钢-ECC组合箱梁的剪力滞效应。相较于两点对称荷载，集中荷载会导致更大的剪力滞效应。更多还原

【Abstract】 In order to analyze the potential impacts of transverse cracks on structural safety of Composite box girder, Engineered Cementitious Composite(ECC) numerical model was built using ABAQUS program. This paper aims to reveal the change of shear lag of steel-ECC composite box girder and analyze the influencing factors of shear lag effects. The results show that with the increase of load, the shear lag effect of steel-ECC composite box girder gradually increases, but when the strain of ECC flange plate reaches the limit state, the shear lag effect begins to stabilize. In addition, the shear lag effect of steel-ECC composite box girder can be effectively reduced by appropriately reducing the width and thickness of flange plate or increasing the height of box girder web. Meanwhile, compared with two-point symmetric loads, concentrated loads lead to greater shear lag effect. These research results can provide theoretical support for designing safer and more reliable steel-ECC composite box girder.更多还原