【摘要】 将无网格法和弥散裂缝模型结合用于裂缝分析时,需要较细密的节点分布。为了准确描述土体裂缝开展,提出了一种无网格自动加密方法。通过在等参单元上布点后变换到实际的背景积分单元中,实现了裂缝开展区域的局部加密。在背景积分单元中使用有限元插值来计算新增节点和高斯积分点的状态变量。将提出的方法与弥散裂缝模型相结合,可用于土体裂缝的分析。对土梁弯曲试验进行模拟计算,验证了方法的有效性。更多还原

【Abstract】 When applied to crack analysis,the meshfree method requires a dense node distribution to get satisfactory result.An automatic node refinement procedure is presented in this paper for better describing crack propagation.The crack area is refined by generating nodes in isoparametric elements and then transferring them into corresponding background integration elements.The state values at new nodes and gauss integration points are obtained using finite element interpolation.Combining with the smeared crack model,the presented method can be used to simulate crack propagation in soil.A soil beam bending test is analyzed to demonstrate the effectiveness of the proposed method.更多还原