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To study the bending strength of mass concrete under dynamic loading, the pure bending zone of three-graded concrete beam is considered as a three-phase composite composed of matrix, aggregate and interface between them on meso-level. Dynamic constitutive model considering strain-rate strengthening effect and damage softening effect is adopted to describe the cocrete and meso-element's damage. The failure mechanisms of beam under impact loading, triagle wave load, dynamic load coupling with initial static loading were simulated by using displacement-controlled FEM. Furthermore, stress-strain curve of the specimens and their dynamic bending strength were obtained. The results obtained from numerical simulation agreed well with experimental data. 相似文献
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大学生的专业素质和专业能力培养是大学人才培养质量中的重要一环,大学生力学类课程的教学对训练大学生的专业素质和锻炼大学生专业能力有重要的提升作用,如何做好力学类课程的教学工作,培养大学生的专业素质和专业能力,有待于力学类课程教师进行深入研究,本文拟结合北京工业大学土木工程专业力学类课程的教学改革探索与思考,提出采用"教育+教学+训练"模式,实施精细化教学,是提高教学质量的关键。 相似文献
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