- 摘 要
-
(东南大学混凝土及预应力混凝土结构教育部重点实验室,南京 210096)
[摘要]对于部分预应力混凝土受弯构件在使用阶段的抗裂问题,《混凝土结构设计规范》给出了相应的裂缝宽度计算公式,但此公式较为复杂,尤其是消压后钢筋应力增量的计算。用名义拉应力法进行裂缝控制简单方便,但往往不能直接用于裂缝宽度计算或精度较差。以规范裂缝宽度计算思路为基础,加以修改,引入名义拉应力,建立以名义拉应力表示的裂缝宽度计算公式,大大简化计算,且具有较高的精度。
[关键词]部分预应力混凝土;受弯构件;裂缝;名义拉应力
Discussion on the method for calculating crack width of partial prestressed concrete beams
Yu Qi,Meng Shaoping(Key laboratory of RC & PC Structures of Ministry of Education, Southeast University, Nanjing 210096, China)
Abstract:Code for design of concrete structures of China presents the expression for calculating crack width of partial prestressed concrete beams. But the expression is quite complicated. Nominal tensile stress method for prestressed concrete crack control is very simple, but it can not be used to calculate crack width. Based on the method of code, we made some modifications and got a expression with nominal tensile stress for calculating crack width of partial prestressed concrete beams. The proposed expression is more simple and has satisfied precision.
Keywords:partial prestressed concrete; beam; crack; nominal tensile stress
作者简介:于琦,博士研究生,Email:kestrely@yahoo.com.cn。
参考文献
[1]英国规范. BS81101—1997混凝土结构规范[S]. 1997.
[2]JGJ92—2004无粘结预应力混凝土结构技术规程[S].
[3]GB50010—2002混凝土结构设计规范[S].
[4]美国规范.ACI318M—89钢筋混凝土房屋建筑规范[S].
[5]吕志涛, 孟少平. 现代预应力设计[M]. 北京:中国建筑工业出版社,1998.
[6]孙宝俊, 郑文忠,吕志涛. 部分预应力混凝土裂缝控制设计建议[J]. 中国公路学报,1995,8(2).
[7]蓝宗建, 梁书亭, 孟少平. 混凝土结构设计原理[M]. 南京:东南大学出版社,2002.