不同初始静载混凝土轴向拉伸试验研究

发布时间：2019-03-20 17:02

【摘要】：为研究混凝土材料的动态性能,利用MTS-810NEW液压伺服试验机对尺寸为100 mm×100 mm×510 mm棱柱体混凝土材料试样进行了初始静态荷载为0~20 k N的动态轴向拉伸试验,研究了混凝土材料经历不同初始静态荷载后的动态拉伸破坏特征、应力应变关系和动态抗拉强度。结果表明:荷载值由静态过渡到动态荷载时,混凝土材料的动弹性模量发生较大变化,且随着初始静态荷载值的增加,混凝土材料动弹性模量有增大趋势;混凝土材料动态应力应变关系曲线中,峰值应力所对应的应变值与初始静态荷载值无关;随着初始静态荷载的增加,混凝土材料动态拉伸破坏断面面积逐渐增大,且粗骨料被拉断的数目随着初始静态荷载的增加而先增加,后趋于平稳;随着初始预加静态荷载值的增加,混凝土材料的动态轴向拉伸强度先增加,然后趋于稳定。
[Abstract]:In order to study the dynamic performance of concrete material, the dynamic axial tensile test of concrete specimen with the size of 100 mm 脳 100 mm 脳 510 mm prismatic concrete was carried out by using MTS-810NEW hydraulic servo test machine, and the initial static load was 0 / 20 kV. The dynamic tensile failure characteristics, stress-strain relationship and dynamic tensile strength of concrete subjected to different initial static loads are studied. The results show that the dynamic elastic modulus of concrete material changes greatly when the load value is transferred from static to dynamic load, and the dynamic elastic modulus of concrete material increases with the increase of initial static load value. In the dynamic stress-strain curve of concrete, the strain value corresponding to the peak stress is independent of the initial static load. With the increase of initial static load, the area of dynamic tensile failure section of concrete material increases gradually, and the number of coarse aggregate broken increases first with the increase of initial static load, then tends to steady. With the increase of initial preloading static load, the dynamic axial tensile strength of concrete increases first and then tends to be stable.
【作者单位】：南京水利科学研究院;水文水资源与水利工程科学国家重点实验室;河海大学;
【基金】：国家杰出青年科学基金(51325904) 国家自然科学基金(51409162;51679150) 国家重大科研仪器研制项目(51527811) 江苏省自然科学基金资助项目(BK20140081) 国家重点研发计划资助(2016YFC0401907) 水利部公益性行业专项经费项目(201501036) 南京水利科学研究院基金(Y415005)
【分类号】：TU528

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