混凝土双轴拉压动态强度及破坏准则试验  

Experimental Study of Concrete Dynamic Strength and Failure Criterion under Biaxial Tensile-Compressive Load

作　　者：尚世明[1] 宋玉普[1] 

机构地区：[1]大连理工大学海岸及近海工程国家重点实验室,辽宁大连116024

出　　处：《沈阳建筑大学学报（自然科学版）》2012年第5期782-787,共6页Journal of Shenyang Jianzhu University：Natural Science

基　　金：国家自然科学基金项目(90815026)

摘　　要：目的研究不同应变率和不同侧拉应力对普通混凝土强度的影响,建立普通混凝土的动态拉压强度准则.方法利用大连理工大学自行研制的大型静、动三轴伺服试验系统,对带有螺栓的哑铃形变截面试件和立方体试件,进行了不同侧拉应力和不同应变率下混凝土动态强度试验.结果混凝土动态双轴拉压强度随拉应力的增加而逐渐减小,随着应变率的增加而增加.当应变率为10-2s-1时,单轴抗拉强度增加幅度最小,为8.9%;当侧拉应力为1.4 MPa时增加最大,为32.8%.结论通过数据拟合得到了混凝土动态拉压破坏准则,为分析混凝土在动态拉压应力状态下混凝土结构的数值分析提供了依据.The influences of different strain rates and different lateral tensile stresses to ordinary concrete were studied;the dynamic tensile-compressive failure criterion was established. By the large static and dynamic triaxial servo test system developed by Dalian University of Technology, under the different tensile stresses（0 MPa,0. 7 MPa,1.4 MPa,2. 1 MPa and 2. 8 MPa） ,and different strain rates（ 10 ^-5 s^-1 ,10^-4 s^-1, 10^-3 s^-1 ,and 10^-2 s^-1）, dynamic biaxial tensile-compressive strength of concrete was tested. The concrete dynamic strength is decreased with the increase of lateral tensile stress and increased with the increase of strain rate. When the strain rate is 10^-2 s^-1 ,the increased scale of uniaxial tensile strength is the smallest （8.9 % ） ;when lateral tensile stress is 1.4 MPa, the increased scale of strength is the biggest （32. 8 % ）. By fitting the experimental data, concrete dynamic tensile-compressive failure criterion was established. The established failure criterion could provide the basis for analyzing concrete failure under dynamic tensile-compressive load.

关 键 词：混凝土 拉压 动态强度 应变率 动态破坏准则 

分 类 号：TU502.6[建筑科学—建筑技术科学]