钢-混凝土曲线组合梁弯扭性能的试验研究

Experimental Research on Bending-torsion Characteristics of Steel-Concrete Curved Composite Beams

以跨径比(计算跨度与曲线半径的比值)和横隔板数目为参数,对6片钢-混凝土简支曲线组合梁进行了试验研究,得到了曲线组合梁跨中集中荷载作用下的荷载-变形曲线、应变分布和钢梁与混凝土板间的相对滑移规律。试验结果表明:曲线组合梁的抗弯刚度和抗扭刚度均随跨径比的增大而降低,横隔板数目对其受弯性能影响不大,但端横隔板对受扭性能影响较大;有横隔板处切向应变在曲线内侧小,外侧大,无横隔板处则相反;钢梁与混凝土板结合面上的切向滑移随跨径比的增大而增大,横隔板数目对其影响较小。

With the span-radius ratio and diaphragm’ s number as the design parameters, six simple steel-concrete curved composite model beams were tested under the concentrated load at middle span, the load-de-formation curve, section strain, and interfacial slip were measured. The test results show that, the bending and torsional stiffness of the steel-concrete curved composite beam all decrease with the span-radius ratio’ s increase, the diaphragm’ s number has little influence on the bending stress behavior, but the end diaphragms affect the torsional stress behavior apparently. The tangential strain at the position with diaphragm is small at inside and large at outside of the curve, but reverse at the position without diaphragm. The tangential slip between the con-crete slab and steel girder increase with the span-radius ratio’ s increase, but the diaphragm’ s number has little influence on it.