碾压混凝土多轴抗剪试验研究及破坏准则     

彭军  宋玉普  赵国藩 《大连大学学报》1996,(4)

碾压混凝土筑坝具有节省投资,施工速度快及简化温控技术等优点,因此在国内外得到了广泛推广,但随之而来的层间抗剪特性成为急待解决的问题,层间抗剪强度已成为决定碾压混凝土坝抗滑稳定的重要因素,结合同家“八·五”科技攻关项目“普定碾压混凝土拱坝层间抗剪特性研究”,本文进行了碾压混凝土立方试件单轴及多轴抗剪试验,建议了多轴抗剪破坏准则,可以作为工程设计的依据。  相似文献   

混凝土轴拉试验轴拉保证措施的研究   总被引：6，自引：1，他引：6  

张林俊  宋玉普  吴智敏 《实验技术与管理》2003,20(2):99-101,124

在混凝土轴拉试验中，能否达到满意的“轴拉”效果是试验成败的关键。通过对国内混凝土轴拉试验，在制作中和试验中的轴拉保证措施进行分析和比较，得出了一般性的结论和建议。对解决轴拉试验中的对中问题具有一定的参考价值。  相似文献   

Calculation Model of Equivalent Strength for Induced Crack Based on Double-K Fracture Theory and Its Optimizing Setting in RCC Arch Dam   总被引：2，自引：0，他引：2  

张小刚宋玉普  吴智敏 《天津大学学报(英文版)》2005,11(1):59-65

By means of fracture testing on roller-compacted concrete (RCC) three-point bending beams with two different specimen sizes, the P-CMOD complete curve for RCC was gained. Furthermore, by applying double-K fracture theory, KIC^ini,KIC^un, as well as the critical effective crack length and the critical crack tip opening displacement, were evaluated. Based on the double-K fracture parameters above, the calculation model of equivalent strength for induced crack was established, thus the calculation method on its initiation, stable propagation and unstable fracture was ascertained. Moreover, the finite element simulation analysis of stress field in ShaPai arch dam and the on-site observational splaying points of induced crack at different altitudes validated the reliability of the model. Finally, crack inducer‘s optimal setting in RCC arch dam was studied. It improves the design level of induced crack in RCC arch dam and satisfies the necessity of engineering practice.  相似文献   

混凝土三轴等幅拉-压疲劳性能试验研究     

宋玉普  曹伟  孟宪宏 《上海大学学报(英文版)》2005,9(2):127-133

Fatigue tests were conducted on tapered plain concrete prism specimens under triaxial constant-amplitude tension-compression cyclic loading. The low stress of the cyclic loading was taken as 0.2fc and the upper stress ranged from 0.20ft to 0.65ft. Three constant lateral pressures were 0.1fc, 0.2fc and 0.3fc respectively. Based on the results, the three-stage evolution nile of the fatigue stiffness, maximttm(minimum) longitudinal strain and damage were analyzed, and a unified S-N curve to calculate fatigue strength factors was worked out. The results show that the fatigue strength and fatigue life under triaxial constant-amplitude tension-compression cyclic loading are smaller than those under uniaxial fatigue condition. Moreover, the secondary strain creep rate is related to the fatigue life, a formula for describing their relation was derived. The investigation of this paper can provide information for the fatigue design of concrete structures.  相似文献   

高温后高强高性能混凝土双轴压强度规律与破坏准则     

何振军  宋玉普 《东南大学学报》2008,24(2)

利用大型静动真三轴试验机,进行了常温20℃以及200,300,400,500和600℃高温后高强高性能混凝土在7种应力σ2∶σ3=0∶-1,-0.20∶-1,-0.30∶-1,-0.40∶-1,-0.50∶-1,-0.75∶-1,-1.00∶-1双轴压试验.单双轴压试块尺寸为100 mm×100 mm×100 mm立方体.受压面的减摩垫层为3层塑料薄膜中间夹3层黄油.测得了双轴主压方向的静态强度,剖析了温度和应力比对单、双轴压强度发展趋势的影响规律以及试件破坏形态.试验结果表明:随温度的升高,高温后高强高性能混凝土的单轴压强度并不一定降低;双轴压强度相对于其单轴的提高倍数取决于应力比、不同温度等级后的高强高性能混凝土"脆硬性".提出了修正的带有温度和应力比参数高强高性能混凝土Kupfer-Gerstle破坏准则公式.  相似文献