HRB500级钢筋混凝土梁受弯刚度试验

为了进一步研究高强钢筋混凝土梁的刚度计算方法，进行了15根HRB500级钢筋混凝土简支梁及2根HRB335级钢筋混凝土对比梁的试验，详细分析了HRB500级钢筋混凝土梁的受弯性能。结果表明：HRB500级钢筋混凝土简支梁正截面符合平截面假定，实测挠度比现行规范计算值略大，相对误差在6%左右，根据该试验和收集的部分高强钢筋混凝土梁的试验数据分析结果，提出了修正后适合HRB500级钢筋混凝土梁的刚度公式，且采用该修正后的公式计算HRB500级钢筋混凝土梁的跨中挠度具有更高的精度。

Experiment on Flexural Stiffness of Reinforced Concrete Beams with HRB500 Reinforcement Bars

In order to study the calculation method of stiffness of high-strength reinforced concrete beam, the bending behavior of reinforced concrete beams with HRB500 reinforcement bars were analyzed based on the tests of 15 flexural reinforced concrete beams with HRB500 reinforced concrete and 2 reinforced concrete beams with HRB335 reinforcement bars. The result shows that the normal section of the simply supported beam with HRB500 reinforcement bars accords with the plane section assumption; the measured deflection in relative error is about 6% which is larger than the calculated deflection. According to the tests and some experimental data of high-strength reinforcement bars beams, a modified formula which was suited for reinforced concrete beams with HRB500 reinforcement bars was proposed. The new calculation method is more accurate to mid-span deflection of beams with HRB500 reinforcement bars.