钢板混凝土复合梁在爆炸荷载作用下的损伤评估研究

为满足钢板混凝土复合梁爆炸损伤评估的实际需要，完成了钢板混凝土复合梁与钢筋混凝土梁承载性能的比较试验，研究了两种梁的承载性能与破坏特点，获得了二者的抗力试验曲线、抗弯变形限值及抗力函数。基于钢板混凝土复合梁的等效单自由度运动方程，采用数值求解方法，得出了评估其在爆炸荷载作用下破坏状态的超压-冲量（P-I）等损伤曲线。研究结果表明：钢板混凝土复合梁的承载力、变形限值、临界超压以及临界冲量比钢筋混凝土梁的都要高，前者的抗爆性能更好。

Damage assessment of steel-concrete composite beam subjected to blast loading

In order to meet the practical needs of damage assessment of the steel-concrete composite beams (i.e. the composite beams in short) subjected to blast loading, tests of carrying load capacity of the composite beams were conducted compared with reinforced concrete beams. The carrying load capacities and failure features of the two kinds of beams were studied, and the experimental resistance curves and bending deformation limits as well as the resistance functions of them were obtained. Based on the equivalent single-degree-of-freedom motion equation of the composite beams, the pressure-impulse (i.e. P-I in short ) isodamage curves for assessing the damage status of them were got by means of the numerical simulation method. The research results show that the carrying load capacity, deformation limits, critical overpressure and critical impulse of the composite beams are higher than those of reinforced concrete beams, indicating that the former beams have better blast resistance.