| 王立成,陈桂斌.基于细观刚体弹簧元的轻骨料混凝土力学性能数值模拟[J].水利学报,2008,39(5): |
| 基于细观刚体弹簧元的轻骨料混凝土力学性能数值模拟 |
| Mesoscopic simulation for mechanical properties of lightweight aggregate concrete by rigid body spring model |
| |
| DOI： |
| 中文关键词: 轻骨料混凝土 刚体弹簧元 细观 静态力学性能 数值模拟 |
| 英文关键词: lightweight aggregate concrete rigid body spring model mesoscopic static mechanical properties numerical simulation |
| 基金项目: |
|
| 摘要点击次数: 2890 |
| 全文下载次数: 620 |
| 中文摘要: |
| 采用基于二维细观刚体弹簧元的数值方法，模拟了轻骨料混凝土静态加载下的力学性能，并将数值模拟结果与试验结果进行了对比分析。得出的主要结论为：加载边界无约束试件的抗压强度与峰值应变相对于有约束试件分别降低31.4％、55.6％；立方体试件抗压强度、峰值应变随尺寸的增大而减小，100mm×100mm×100mm、 200mm×200mm×200mm非标准立方体试件抗压强度换算系数分别为0.95和1.09，峰值应变换算系数分别为0.91和1.08,通过数值模拟得到了棱柱体试件单轴受压、单轴受拉状态下的应力应变关系全曲线，并给出了单轴拉压强度之间的关系。与试验结果的比较分析表明，二维刚体弹簧元数值方法能较好地预测轻骨料混凝土的静态力学性能，可以用于分析轻骨料混凝土结构。 |
| 英文摘要: |
| The lightweight aggregate concrete is regarded as a three_phase composite on meso_scale composed of mortar, light weight coarse aggregate and interfacial transition zone. A 2_D mesoscopic rigid body spring model is suggested to simulate the static mechanical properties of this kind of concrete and the numerical analysis results are compared with some previous experimental findings. It is found that the compressive strength and peak strain of cubic specimen without friction are less than those of the specimen with friction by 31.4% and 55.6% respectively. In addition, by varying the size of cubic specimen, the compressive strength and peak strain decrease with the increase of specimen size is revealed. Moreover, by using the rigid body spring model, the full stress-strain curves of lightweight aggregate concrete under uniaxial compression and tension are simulated. The feasibility of this method is verified by experimental data. |
|
查看全文
查看/发表评论 下载PDF阅读器 |
| 关闭 |