文档介绍：AFRP筋体外预应力梁弯曲性能分析与程序设计
高宏张继文朱虹陈允锐
(东南大学土木工程学院南京 210096)
体外预应力梁的体外筋与梁体之间不再具有平面变形协调关系,因此结构分析相对复杂。本文引申了塑性铰理论,结合MathCAD程序,针对AFRP筋体外预应力混凝土简支梁的极限抗弯承载力、给定荷载条件下的内力及变形进行了分析,总结出一套简单有效的体外预应力梁结构分析方法。
AFRP;弯曲;体外预应力;塑性铰;MathCAD
Analysis of Flexural Performance of Concrete Beams Externally Pre-stressed with AFRP Tendons And Corresponding Programing
Gao Hong ,Zhang Ji Wen,Zhu Hong,Chen Yun Rui
(College of civil engineering, Southeast University, Nanjing 210096)
Abstract: There are no more plane harmony between the strain of the concrete beams and the external tendons of the beams externally prestressed with tendons, as the structure analysis plex. In this passage, the 塑性铰theory was extended, the extreme flexural capacity and the response of beam under certain load was analyzed with the help of MathCAD program, thus formed a kind of effective analysis method of structure externally pre-stressed with tendons.
key words: AFRP;flexural;externally pre-stressing;plastic hinge;MathCAD
1 概述
体外预应力梁
体外预应力技术的优点有很多,例如:结构检测方便、避免了管道灌浆质量隐患、预应力筋材更换方便、筋材矢跨比较高从而提高了承载力、便于工程加固等。但是体外预应力的筋材暴露在外,导致的腐蚀现象较严重
。因此采用耐腐蚀材料作为体外筋就成为体外预应力结构的发展趋势。FRP材料由于是非金属高强聚合物材料,其耐疲劳性能和抗腐蚀性能比高强钢筋(钢绞线)都更强,因此很多科研机构正在积极的进行体外预应力结构应用FRP新材料的试验和理论研究。在美国,第一座CFRP筋体外预应力公路桥Bridge Street Bridge已经在Southfield市建成。
AFRP筋由于具有抗剪性能较好的特点,尤其适合用作直接在转向块处弯折的体外筋,在桥梁加固等领域有广阔的前途。在此背景下,相关科研组进行了FRP筋体外预应力混凝土梁的静力与动力荷载试验[1],AFRP筋体外预应力梁的破坏形式设计为受压区混凝土压碎