新型被动式真三轴试验装置
发布时间：2018-09-12 12:25
【摘要】：为探究混凝土在被动约束机制下的多轴本构关系,采用玻璃纤维增强复合材料(GFRP)筋和钢板作为组成侧向围压装置的主要部件,采用万能试验机作为竖向加载装置,形成新型被动式真三轴试验装置.该装置可在两垂直方向施加互相独立的随混凝土侧向膨胀线性增长的被动约束.通过单根GFRP筋及侧向围压装置的轴拉试验,验证采用同种GFRP筋的侧向围压装置的被动约束刚度的恒定性和可重复性,并确定不同GFRP筋直径对应的侧向刚度值.对12个100mm×100mm×100mm的混凝土立方体试块进行双向等约束的被动式真三轴试验.立方体试块的力学性能与FRP布约束混凝土标准圆柱的轴压结果类似,极限强度随约束刚度比的增长而增长.该装置可为混凝土提供有效的被动围压,替代FRP包裹圆柱的试验方法,为被动约束下混凝土的本构关系研究提供试验基础.
[Abstract]:In order to explore the multiaxial constitutive relationship of concrete under passive restraint mechanism, glass fiber reinforced composite (GFRP) bars and steel plates are used as the main components of the lateral confining pressure device, and the universal testing machine is used as the vertical loading device. A new type of passive true triaxial test device is formed. The device can impose independent passive constraints in two vertical directions with linear growth of concrete lateral expansion. Based on the axial tension test of a single GFRP bar and a lateral confining pressure device, the stability and repeatability of the passive restraint stiffness of the same GFRP bar are verified, and the lateral stiffness values corresponding to the different diameter of the GFRP bar are determined. A passive true triaxial test of 12 100mm 脳 100mm 脳 100mm concrete cubes is carried out. The mechanical properties of cube specimens are similar to those of FRP confined concrete standard columns, and the ultimate strength increases with the increase of confined stiffness ratio. The device can provide effective passive confining pressure for concrete, replace the test method of FRP wrapped cylinder, and provide experimental basis for the study of constitutive relation of concrete under passive restraint.
【作者单位】： 同济大学结构工程与防灾研究所;中国能源建设集团江苏省电力设计院有限公司;
【基金】：国家自然科学基金资助项目(51308404)
【分类号】：TU528
，
本文编号：2239002
[Abstract]:In order to explore the multiaxial constitutive relationship of concrete under passive restraint mechanism, glass fiber reinforced composite (GFRP) bars and steel plates are used as the main components of the lateral confining pressure device, and the universal testing machine is used as the vertical loading device. A new type of passive true triaxial test device is formed. The device can impose independent passive constraints in two vertical directions with linear growth of concrete lateral expansion. Based on the axial tension test of a single GFRP bar and a lateral confining pressure device, the stability and repeatability of the passive restraint stiffness of the same GFRP bar are verified, and the lateral stiffness values corresponding to the different diameter of the GFRP bar are determined. A passive true triaxial test of 12 100mm 脳 100mm 脳 100mm concrete cubes is carried out. The mechanical properties of cube specimens are similar to those of FRP confined concrete standard columns, and the ultimate strength increases with the increase of confined stiffness ratio. The device can provide effective passive confining pressure for concrete, replace the test method of FRP wrapped cylinder, and provide experimental basis for the study of constitutive relation of concrete under passive restraint.
【作者单位】： 同济大学结构工程与防灾研究所;中国能源建设集团江苏省电力设计院有限公司;
【基金】：国家自然科学基金资助项目(51308404)
【分类号】：TU528
，
本文编号：2239002
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