先张法折线预应力混凝土梁的仿真分析  

Simulation and analysis of broken-line pretensioned prestressed concrete beams

作　　者：张海龙[1] 代筠杰[1] 郑明万 

机构地区：[1]华中科技大学土木工程与力学学院,湖北武汉430074 [2]济南市市政工程设计研究院有限责任公司,山东济南250002

出　　处：《华中科技大学学报（自然科学版）》2010年第9期98-100,共3页Journal of Huazhong University of Science and Technology(Natural Science Edition)

基　　金：建设部科学研究开发资助项目(06-k3-14)

摘　　要：运用计算机仿真技术建立了先张法折线预应力混凝土梁的有限元模型,对其关键技术进行了研究,包括折线筋转折处的应力集中、合理的锚固拉杆数及与后张曲线预应力混凝土梁受力的对比分析.计算结果表明:导向辊的半径由0.01 m增加到0.04 m时应力集中因子迅速减小;当其半径大于0.04 m时,应力集中因子变化趋于平缓;而当其半径大于0.10 m以后,应力集中效应已不再明显.A finite element model for a broken-line pre-tensioned prestressed concrete beam was built using modern computer simulation technology. The key technology of the model was analyzed, including the stress concentration of broken-line tendon turning place, the reasonable number of the anchor rod, mechanical comparative analysis of the broken-line pre-tensioned prestressed beam and the curved post-tensioned prestressed beam. The results illustrate that the stress concentration factor decreases rapidly when the radius of the guider roller increases from 0.01 m to 0.04 m. When its radius is greater than 0.04 m, the stress concentration factor tends to be smooth. And if its radius is greater than 0. 10 m, the effect of stress concentration is no longer apparent.

关 键 词：预应力 混凝土梁 应力集中 先张法 折线筋 

分 类 号：U448.21[建筑科学—桥梁与隧道工程]