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Trefftz间接法解自由面渗流问题   总被引:2,自引:0,他引:2  
渗流问题是岩体水力学研究的重点之一,较常规的有限元法和传统的边界元法而言,Trefftz型边界元法具有程序简单、计算量小及无须奇异积分等特点。本文给出定常和非定常自由面渗流问题的Trefftz解法,计算结果表明,该法收敛性好,结果比较精确。  相似文献
2.
The differences between finite deformation and infinitesimal deformation are discussed. They are exercised on elasto-viscoplastic constitutive relations of concrete. Then, a rate-dependent mechanics model was presented on the basis of Ottosen‘ s fourparameter yield criterion, where different loading surface transferring laws were taken into account, when material was in hardening stage or in softening stage, respectively. The model is well established, so that it can be applied to simulate the response of concrete subject to impact loading. Green-Naghdi stress rate was introduced as objective stress rate. Appropriate hypothesis was postulated in accordance with many experimental results, which could reflect the mechanical behaviour of concrete with large deformation. Available thoughts as well as effective methods are also provided for the research on related engineering problems.  相似文献
3.
基于数值流形方法,结合广义节点的概念,构造了一类节点位移用任意阶多项式展开的流形Trefftz直接法。这种方法融合了数值流形方法和Trefftz直接法的优点。计算结果表明,流形Trefftz直接法与Trefftz直接法以及其他计算方法相比有较高的精度。  相似文献
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