论文部分内容阅读
为了完善超压G冲量(PGI)曲线法使其更利于先期设计阶段的使用,基于单自由度等效运动方程模型和理想弹塑性抗力函数,对传统能量法进行去无量纲化处理,推导出PGI曲线弯曲和剪切破坏下的超压及冲量渐近线的理论计算公式,使用LSGDYNA动力分析软件对RC梁构件进行大量数值模拟计算,并利用经验法得到了动态区PGI曲线的拟合公式.通过数值模拟获得的数据拟合PGI曲线与改进的无量纲能量法推导公式得到的PGI曲线进行对比,验证了所提方法的合理性与实用性.研究表明,仅仅通过计算构件最大抗力、刚度和质量等参数就可以较好地预测构件不同损伤水平的PGI曲线,从而可以快速生成PGI曲线,并利用其比较不同参数RC构件的抗爆性能,以及预测构件在不同爆炸荷载下的破坏模式与损伤水平.
In order to improve the use of overpressure G impulse (PGI) curve method to make it more conducive to the use of the early design stage, based on the single degree of freedom equation of motion equations and the ideal elastoplastic resistance function, the traditional energy method to go non-dimensional treatment, derived PGI curve bending and shear failure under the overpressure and impulse asymptotic theoretic formula, the use of LSGDYNA dynamic analysis software for RC beam member numerical simulation and the use of empirical method obtained PGI dynamic curve fitting formula By comparing the PGI curves obtained from the data obtained by numerical simulation and PGI curves derived from the improved dimensionless energy method, the rationality and practicability of the proposed method are verified.The results show that only by calculating the maximum resistance of members, the stiffness And PGI curves can be used to predict the PGI curves of different damage levels so that the PGI curve can be quickly generated and compared with the antiknock performance of RC components with different parameters and the failure modes of components under different explosion loads Damage level.