部分预应力( PPC)梁裂缝控制计算的探讨
- 摘 要
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李忠诚 (广东核电集团有限公司 深圳 518031)李唐宁 (重庆建筑大学 400045)
[提要] 针对部分预应力( PPC)梁裂缝控制问题,在实验梁数据的基础上,对PPC梁裂缝宽度的直接计算方法和用名义拉应力实施间接控制的方法进行了分析研究,解析了当今肚界具有代表性的几种规范中裂缝宽度的计算模式及其对PPC梁的计算效果。同时结合裂缝宽度的计算,对已获审查通过的我国《混凝土结构设计规范》( GB50010)进行了分析。相关结论可供PPC梁设计参考。
[关键词] PPC梁 裂缝控制 规范 名义拉应力
Engaging in the problcm of the crack-controlling of PPC bcam, this papcr analyzcs and discusscs two ways of crack-controlling by calculating dircctly and controlling indircctly through the nominal tcnsion strcss, bascd on the tcst rcsults of some cxpcrimcntal bcams. Scvcral crack width calculation modcs in the prcscnt typical codcs in the world as wcll as thcir calculation cffccts for the PPC bcams have bccn introduccd and analyzcd. Bascd on the calcuiation, the ncw Concrete Structure Design Code( GB50010), which will be promulgatcd as the substitute for GBJ10-89, has bccn analyzcd also. Some conclusions can be applicd to the structural dcsign of the PPC bcam.
Keywords: PPC bcam; crack-controlling; codcs; nominal tcnsion strcss