爆炸荷载下钢筋混凝土简支板的有限差分分析

考虑应变率效应、剪切和弯曲变形、横断面几何尺寸、荷载情况,编制有限差分分析程序,精确有效地分析爆炸荷载下钢筋混凝土简支板的动力响应。与构件截面应变速率相适应,采用截面分层分析模型,建立截面矩与和曲率的关系。根据所提公式,将相应的应变率效应与截面分层分析模型相结合,沿构件长度方向,对构件纵向应变速率的分布进行评估。采用明确的有限差分方法,可得到包括剪切变形和转动变量的Timoshenko梁方程的数值解。结合爆炸量和距离,根据钢筋混凝土板爆炸试验的结果,验证所提有限差分分析模型的精确性。与传统的单自由度分析和有限元分析相比,有限差分分析程序快速、精确,结合了单自由度分析的速度和有限元分析精确的优势,十分适合于设计公司应用。

Finite Difference Analysis of Simply Supported RC Slabs for Blast Loadings

A finite difference procedure that can account for strain-rate effects,both shear and flexural deformations,permits variations in cross-section geometry and strength and loading over the length of a component is proposed to accurately and efficiently analyze the dynamic response of a simply supported structural member under blast loads.A section-based layered analysis model that accommodates varying strain rates across a member's cross-section is used to derive sectional moment-curvature relationships.A for...