钢筋混凝土震塌厚度计算公式对比研究

COMPARATIVE ANALYSIS OF SCABBING THICKNESS ESTIMATION OF REINFORCED CONCRETE STRUCTURES

震塌破坏是钢筋混凝土结构三种局部破坏中的一种,也是影响结构抗局部破坏能力的主要因素。分析对比了目前应用较广泛的钢筋混凝土震塌厚度经验计算公式,并与试验结果进行比较,得到了各经验公式的计算误差和适用范围。在这些经验公式中,Bechtel公式和修正BRL公式的预测值与试验结果吻合得最好,Bechtel公式可用来预测无震塌最小厚度,而修正BRL可用来预测震塌最小厚度,即临界贯穿厚度。

Recent terrorist activities have rekindled an interest in studying the local damage of reinforced concrete (RC) structures subjected to explosion or impact loads. Scabbing is one of three types of local damage of RC structures. It is also the major factor that influences the resistance of RC structures to the local damage. In this paper, the presently widely-used formulae of the scabbing thickness of RC structures are compared with the test data and analyzed. The application range and the predicting error of each empirical formula is obtained. It is concluded that, the predictions of Bechtel formula and modified BRL formula fit best with the test results. The Bechtel formula can be used to predict critical scabbing thickness, and the modified BRL formula can be used to predict the critical penetration thickness.