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基于细观刚体弹簧元的轻骨料混凝土力学性能数值模拟
引用本文: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):588-595.
作者姓名:王立成  陈桂斌
作者单位:大连理工大学,海岸和近海工程国家重点实验室,辽宁,大连,116024
基金项目:教育部创新团队发展基金
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.

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  刚体弹簧元  轻骨料混凝土结构  静态力学性能  数值模拟  spring  model  body  rigid  lightweight  aggregate  concrete  mechanical  properties  simulation  预测  分析表  比较  应变关系  抗压强度  全曲线  应力  状态  受拉  单轴受压
文章编号:0559-9350(2008)05-0588-08
修稿时间:2007年6月6日

Mesoscopic simulation for mechanical properties of lightweight aggregate concrete by rigid body spring model
WANG Li_cheng.Mesoscopic simulation for mechanical properties of lightweight aggregate concrete by rigid body spring model[J].Journal of Hydraulic Engineering,2008,39(5):588-595.
Authors:WANG Li_cheng
Affiliation:Dalian University of Technology, Dalian 116024, China
Abstract: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.
Keywords:lightweight aggregate concrete  rigid body spring model  mesoscopic  static mechanical properties  numerical simulation
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