基于起裂韧度准则的混凝土裂缝黏聚区特性
发布时间:2018-10-31 10:50
【摘要】:基于起裂韧度扩展准则和黏聚裂缝模型研究混凝土断裂全过程中的裂缝尖端黏聚区特性;利用不同尺寸的带裂缝三点弯曲梁试件,计算得到了裂缝尖端黏聚区的长度、黏聚力、裂缝张开位移等,并采用现有试验成果和有限元方法计算成果对本文结果进行了验证。分析结果表明:最大黏聚区长度以及峰值时刻对应的临界黏聚区长度随试件尺寸增大而逐渐增大,最大黏聚区长度受拉伸软化曲线影响;裂缝断裂全过程曲线受软化曲线影响较小;当外荷载达到峰值后裂缝张开位移近似为线性分布,黏聚力分布受拉伸软化曲线影响较大。
[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.
【作者单位】: 河北工业大学土木与交通学院;
【基金】:国家自然科学基金(51309073) 河北省自然科学基金(E2014202257) 高等学校博士学科点专项科研基金(20131317120012)
【分类号】:TU528.0
本文编号:2301903
[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.
【作者单位】: 河北工业大学土木与交通学院;
【基金】:国家自然科学基金(51309073) 河北省自然科学基金(E2014202257) 高等学校博士学科点专项科研基金(20131317120012)
【分类号】:TU528.0
【相似文献】
相关期刊论文 前1条
1 曹明莉;杨海成;王立久;;基于起裂荷载的混凝土抗冻机理研究[J];混凝土;2011年01期
,本文编号:2301903
本文链接:https://www.wllwen.com/kejilunwen/huaxuehuagong/2301903.html