基于统一强度理论的巴西圆盘劈裂强度分析-《建筑科学与工程学报》

文章信息/Info

Title:: Analysis on Splitting Strength of Brazilian Disc Based on Unified Strength Theory

Author(s):: ZHAI Yue, ZHAO Jun-hai, AI Xiao-qin, DENG Zi-chen; School of Geology Engineering and Geomatics, Chang’an University

Keywords:: Brazilian disc test; splitting strength; unified strength theory; concrete; strength criterion; tensioncompression ratio

摘要:: 基于统一强度理论，构建了考虑2个较大主应力相互影响并适用于不同拉压比材料的巴西圆盘试验应力分析的统一劈裂破坏强度准则，通过参数变化得到常用的多种强度准则推导结果；为了验证理论公式，对C35商品混凝土试件进行了巴西圆盘劈裂试验，在试验研究基础上对统一强度准则演化出的多种强度准则计算结果进行对比分析。结果表明：材料的拉压比和中间切应力及相应作用面上正应力组合的加权参数对材料劈裂抗拉强度影响很大，最大拉应变强度理论和最大拉应力强度理论计算得到的劈裂强度分别为上、下限值，其他强度理论得到的值在两者之间，从而验证了统一强度理论对巴西圆盘劈裂试验分析的可靠性和适用性。

Abstract:: Based on the unified strength theory, unified splitting failure strength criterion which considering the interplay of two relatively large principal stress was built. The proposed failure criterion was suitable for all materials under different tensioncompression ratio in Brazilian disc test. The derivation results of several strength criteria were got by changing parameters. In order to verify the theoretical formula, the Brazilian disc split test of specimen made of C35 concrete was carried out. Based on the test data, the calculation results of several strength criteria which developed from the unified strength criterion were compared. The results show that the tensioncompression ratio of material and the weighted parameter which are combined intermediate shear stress and normal stress have great influence on the splitting tensile strength of material. Meanwhile, the splitting strength calculated by the maximum tensile strain strength theory and the maximum stress strength theory are the upper and lower limits of all strength theory. The results verify that the unified strength theory is reliable and suitable for Brazilian disc test.