大面积混凝土结构非线性有限元分析  

Non-Linear Finite Element Analysis on Large-area Concrete Frame Structure

作　　者：张永胜[1] 李雁英[2] 

机构地区：[1]太原理工大学土木工程学院,太原030024 [2]山西大学土木工程系,太原030013

出　　处：《电力学报》2016年第2期167-170,共4页Journal of Electric Power

摘　　要：混凝土结构中,当混凝土的拉应力达到抗拉强度时,混凝土就会开裂,由于混凝土与钢筋的变形协调性,此时钢筋的抗拉强度很小,没有屈服在弹性阶段工作,用弹性方法求得的内力不符合实际受力状态.在反复荷载作用下,钢筋和混凝土的这种粘结作用逐渐减少,相对滑移会很大,再加上收缩变形,它们都与时间有关,导致内力重分布。通过有限元软件,在温度作用下,大面积混凝土结构的裂缝发展极其相应的应力分别从材料的线性和非线性进行数值模拟,并和实际工程观测结果进行比较,采用非线性有限元开裂模型能够较好的估测结构降温引起的应力分布,对工程设计及实践有非常重要的指导意义。In concrete structure,when the tensile stress reaches the tensile strength of concrete,concrete will crack.Deformation due to coordination of concrete and steel,which the tensile strength of steel is very small,did not yield and in elastic stage,elastic method do not meet the actual stress state.Under cyclic loading,the bonding of steel and concrete reduced gradually,the relative slip will be great.With the shrinkage deformation related to time,it leads to redistribution of internal force.Through the finite element software large area concrete frame structure the temperature cracks develop are numerically simulated under the linear and nonlinear material respectively and compare with observations of actual engineering.By nonlinear finite element model it estimates the structure cracks caused by temperature stress distribution better,and have very important significance on the engineering design and practice.

关 键 词：大面积混凝土 非线性 预应力 有限元 

分 类 号：TU378[建筑科学—结构工程]