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根据混凝土单轴动力特性试验,对规范给出的混凝土应力—应变关系表达式进行了修正,引入了应变率的影响,并利用修正的表达式对钢筋混凝土梁的开裂弯矩、开裂曲率、极限弯矩和极限曲率进行了数值分析。分析考虑2种情况:①只考虑混凝土的动态特性;②既考虑混凝土的动态特性,也考虑钢筋的动态特性。结果表明,对于适筋梁,混凝土的动态特性对梁的开裂弯矩、开裂曲率、极限弯矩和极限曲率的影响很小,但是钢筋的动态特性的影响比较大;而对于超筋梁,混凝土的动态特性和钢筋的动态特性对梁的开裂弯矩、开裂曲率、极限弯矩和极限曲率都有显著影响。
According to the test of uniaxial dynamic characteristics of concrete, the stress-strain relation expression of concrete given in the regulation is modified, the influence of strain rate is introduced, and the modified expression is used to calculate the cracking moment, cracking curvature and limit of reinforced concrete beam The bending moments and the ultimate curvature were numerically analyzed. Analysis consider two cases: ① only consider the dynamic properties of concrete; ② both consider the dynamic properties of concrete, but also consider the dynamic properties of steel. The results show that the dynamic behavior of concrete beam has little effect on the moment, cracking, ultimate bending moment and ultimate curvature of the beam, but the dynamic characteristics of the steel tend to be relatively large. For the super-beam, concrete The dynamic characteristics of the steel and the dynamic characteristics of the steel have a significant impact on the cracking moment, cracking curvature, ultimate bending moment and ultimate curvature of the beam.