【摘要】：基于起裂韌度擴展準則和黏聚裂縫模型研究混凝土斷裂全過程中的裂縫尖端黏聚區(qū)特性;利用不同尺寸的帶裂縫三點彎曲梁試件,計算得到了裂縫尖端黏聚區(qū)的長度、黏聚力、裂縫張開位移等,并采用現(xiàn)有試驗成果和有限元方法計算成果對本文結(jié)果進行了驗證。分析結(jié)果表明:最大黏聚區(qū)長度以及峰值時刻對應(yīng)的臨界黏聚區(qū)長度隨試件尺寸增大而逐漸增大,最大黏聚區(qū)長度受拉伸軟化曲線影響;裂縫斷裂全過程曲線受軟化曲線影響較小;當外荷載達到峰值后裂縫張開位移近似為線性分布,黏聚力分布受拉伸軟化曲線影響較大。
[Abstract]:Based on the crack initiation toughness propagation criterion and the cohesive crack model, the characteristics of the crack tip adhesion zone in the whole process of concrete fracture are studied. Using different sizes of three-point bending beams with cracks, the length, cohesion force and crack opening displacement at the crack tip are calculated, and the present experimental results and the results of finite element method are used to verify the results in this paper. The results show that the length of the maximum cohesive zone and the critical cohesive zone corresponding to the peak time increase with the size of the specimen, and the maximum length of the cohesive zone is affected by the tensile softening curve. The whole fracture process curve is less affected by the softening curve, and the crack opening displacement is approximately linear distribution when the external load reaches the peak value, and the cohesive force distribution is greatly affected by the tensile softening curve.
【作者單位】： 河北工業(yè)大學土木與交通學院;
【基金】：國家自然科學基金(51309073) 河北省自然科學基金(E2014202257) 高等學校博士學科點專項科研基金(20131317120012)
【分類號】：TU528.0

【相似文獻】

相關(guān)期刊論文 前1條

1 曹明莉;楊海成;王立久;;基于起裂荷載的混凝土抗凍機理研究[J];混凝土;2011年01期

，

本文編號：2301902