论文部分内容阅读
为研究经不同硫酸盐浓度、不同荷载历史以及不同浸泡方式作用下的混凝土的力学性能,对不同因素损伤后的混凝土进行单轴抗压试验,对比分析了混凝土应力-应变曲线的变化规律。研究表明:当荷载历史应力水平低于50%时,单独荷载历史对混凝土应力-应变全曲线影响较小,随着荷载历史应力水平的增大,峰值应力降低,混凝土试件破坏时脆性增加。在连续浸泡-荷载历史-硫酸盐侵蚀联合作用下,混凝土应力-应变曲线有较为明显的上扬,上升段斜率增大,峰值应力提高。在干湿循环-荷载历史-硫酸盐侵蚀联合作用下,混凝土应力-应变曲线变得扁平,单轴抗压强度降低,损伤劣化作用明显。
In order to study the mechanical properties of concrete under different sulfate concentrations, different loading histories and different immersion methods, uniaxial compressive tests of concrete with different factors were carried out. The variation of stress-strain curve of concrete was analyzed. The results show that when the historical stress level is lower than 50%, the history of individual load has little effect on the whole curve of stress-strain curve. With the increase of the historical stress level, the peak stress decreases and the brittleness of the concrete specimen increases. Under the combined action of continuous immersion-load history-sulphate erosion, the stress-strain curve of concrete increases obviously, the slope of rising section increases and the peak stress increases. Under the combination of dry-wet cycle-load history and sulfate attack, the stress-strain curve of concrete becomes flat, the uniaxial compressive strength decreases and the damage is obviously deteriorated.