摘要
为准确分析预应力混凝土结构的力学效应,提出预应力钢束张拉和锚固模拟的接触-预紧单元模型。建立孔道实体与混凝土梁体布尔运算并控制划分得到钢束与孔道的一致网格后,调整节点坐标系,在钢束节点与孔道节点之间建立法向点-点接触单元模拟接触、摩擦和滑移等相互作用,在钢束张拉端与锚板之间建立预紧单元并采用多荷载步加载模拟张拉和锚固过程。以空间曲线钢束算例分析表明,与传统锚固损失估算的面积试算法相比,接触-预紧单元模型计算得到的锚固损失最大相对差约5.0%,具有较高的精度;与传统预应力效应分析的约束方程-初应变法相比,接触-预紧单元模型中钢束呈整体受力特征,更符合预应力钢束的实际工作状态。
In order to analyze the mechanical effects of pre-stressed structure accurately,the contact-pretension element model for simulation of tensioning and anchoring of pre-stress tendon is proposed.By establishing the solid model of duct and performing Boolean operations with main girder,the mesh generation is controlled,then the consistent mesh can be achieved.After adjusting the node coordinate system,the interactions such as contact,friction and sliding,etc.can be simulated by establishing node to node contact elements between tendon and duct in the normal plane of tendon.By establishing pretension elements between stretching end of tendon and anchor plate,then the tensioning and anchoring process can be simulated by applying multi-step pretension load.Take a spatial pre-stressed tendon as an object,the results show that the maximum difference of anchorage loss calculated by proposed contact-pretension element model is about 5.0%compared with the traditional area estimation algorithm,means to high accuracy,and the tendon manifested as global mechanical behavior,which is better than the conventional constraint equation-initial strain method for pre-stressing effect analysis,consistent with the actual working mechanism of pre-stress tendon.
作者
伍彦斌
黄方林
WU Yanbin;HUANG Fanglin(School of Civil Engineering,Central South University,Changsha 410075,China)
出处
《铁道科学与工程学报》
CAS
CSCD
北大核心
2018年第10期2606-2611,共6页
Journal of Railway Science and Engineering
关键词
混凝土结构
预应力效应
点-点接触单元
预紧单元
数值计算
reinforced-concrete structure
pre-stressing effect
node to node contact element
pretension element
numerical computing
作者简介
通信作者:黄方林(1964-),男,湖南邵东人,教授,博士,从事桥梁结构健康监测研究;E-mail:fl-huang@21cn.com。
