钢筋混凝土圆管式空心板塑性内力重分布试验研究

圆管式空心板是一种使用GBF系列高强薄壁管作为永久性内模的空心板。通过试验对两种不同布管方式的圆管式空心板进行了塑性内力重分布性能研究。其中一种试验板为将GBF高强薄壁管平行跨径方向布置的顺管向板,另一种为将GBF高强薄壁管垂直跨径方向布置的横管向板。研究表明:圆管式空心板具有良好的内力重分布性能;顺管向板至少在30.7%的弯矩调幅幅度下均满足承载能力要求和正常使用要求;横管向板至少在27%的调幅幅度下满足承载能力要求和正常使用要求。并且,圆管式空心板受弯时的截面弯矩-曲率关系近似地符合二折线本构模型。

EXPERIMENTAL STUDY ON THE BEHAVIOR OF REDISTRIBUTION OF INTERNAL FORCE OF REINFORCED CONCRETE TUBULAR CORED SLAB

Tubular hollow slab is the hollow slab whose internal mold is permanent internal mold of GBF serial high strength thin-wall pipe.Experimental study on the behavior of plastic internal force redistribution of two kinds of tubular hollow slabs which have different arrangement manner of the high-strength thin-wall pipes was conducted.One of the experimental slabs was called parallel slab inside which the GBF high-strength thin-walled tubes were placed to be parallel with the span direction,the other was called vertical slab inside which the GBF thin-walled tubes were placed to be vertical with the span direction.It was indicated from the study that the tubular hollow continuous slab had good performance of plastic internal force redistribution.The parallel slab could meet requirements of the bearing capacity and the regular service when the value of moment modulating is 30.7% at least.And the vertical slab could meet requirements of the bearing capacity and the regular service when the value of moment modulating is 27% at least.And,the moment-curvature relationship of section approximately conforms to the constitutive model of two straight lines.