港珠澳大桥组合连续箱梁模型试验研究

Model Test of Continuous Composite Box Girder in Hong Kong-Zhuhai-Macao Bridge

以港珠澳大桥组合连续箱梁为研究背景,基于相似原理设计制作了2×8.5m的钢-混组合连续箱梁试验模型。根据实桥施工过程和运营荷载,对试验模型开展分级加载试验和有限元模拟。结果表明:正常运营和150%运营荷载下,集束式剪力钉和混凝土板连接良好,钢箱梁、混凝土板应变和挠度呈线性增长,且卸载回弹良好,表明钢-混组合连续箱梁桥受力安全储备高,结构整体性能好,值得推广应用。

A two-span composite continuous box girder （2 × 8.5 m） test model was designed based on the HZMB shal- low water non-navigable bridge according to principle of similitude. Gradation loading test and finite element modeling were researched based on the actual construction process and operation load. The experimental results show that under 100% and 150% normal operation loads, the measured value of each key strain and deflection measure point in steel gird- er and concrete is linear, and the connection between the shear studs of cluster type and concrete slab is well. In addition, the unloading spring-back strain and deflection is small. In a word, for the high safety capacity and excellent structural o- verall performance, the continuous composite box girder bridge should be popularized and applied.