并筋混凝土板受力性能试验

Mechanical performance experiment of concrete slabs reinforced with bundled steel bars

针对并筋混凝土板破坏形态、位移延性、抗弯承载力、裂缝宽度与刚度等问题,开展了单调荷载下并筋混凝土板(包括两并筋配筋混凝土板、三并筋成束配筋混凝土板和三并筋成排配筋混凝土板)试验研究.结果表明:单调荷载下并筋混凝土板和普通配筋混凝土板均发生了受弯破坏;普通配筋混凝土板的抗弯承载力比两并筋配筋混凝土板的高2%,两并筋配筋混凝土板的抗弯承载力分别比2个三并筋配筋混凝土板高19%和17%;两并筋配筋混凝土板的最大裂缝宽度和跨中挠度与普通配筋混凝土板接近;三并筋配筋混凝土板的最大裂缝宽度和跨中挠度均大于相应的两并筋配筋混凝土板和普通配筋混凝土板.最后,对并筋混凝土板的设计计算方法进行了探讨.

The tests of concrete slabs reinforced with bundled steel bars and single steel bars under monotonic loading were conducted to evaluate the slab mechanical behavior according to failure mode,displacement ductility,flexural strength,crack width and stiffness.The results indicate that all the specimens failed in bending under monotonic loading.The flexural strength of concrete slab reinforced with single steel bars is about 2% higher than that of slab reinforced with horizontal twin bundled steel bars,while the flexural strength of concrete slab reinforced with horizontal twin bundled steel bars is about 19% and 17% higher than those of slabs reinforced with triangular bundled steel bars and horizontal three-bar bundled steel bars,respectively.The maximum crack width and the deflection in midspan of concrete slab reinforced with horizontal twin bundled steel bars are close to those of concrete slab reinforced with single steel bars,while the maximum crack width and the deflection in midspan of concrete slab reinforced with triangular bundled steel bars and horizontal three-bar bundled steel bars are larger than those of concrete slab reinforced with horizontal twin bundled steel bars.The design and the calculation method of concrete slabs reinforced with bundled steel bars were also discussed.