884aa四虎影成人精品,99久久国产综合精品女图图等你,97在线观看永久免费视频,久久精品国产精品亚洲38,ⅵdeodesetv性欧美

    李忠誠    （廣東核電集團(tuán)有限公司  深圳 518031）

    李唐寧    （重慶建筑大學(xué) 400045）

[提要]  針對(duì)部分預(yù)應(yīng)力( PPC)梁裂縫控制問題，在實(shí)驗(yàn)梁數(shù)據(jù)的基礎(chǔ)上，對(duì)PPC梁裂縫寬度的直接計(jì)算方法和用名義拉應(yīng)力實(shí)施間接控制的方法進(jìn)行了分析研究，解析了當(dāng)今肚界具有代表性的幾種規(guī)范中裂縫寬度的計(jì)算模式及其對(duì)PPC梁的計(jì)算效果。同時(shí)結(jié)合裂縫寬度的計(jì)算，對(duì)已獲審查通過的我國《混凝土結(jié)構(gòu)設(shè)計(jì)規(guī)范》( GB50010)進(jìn)行了分析。相關(guān)結(jié)論可供PPC梁設(shè)計(jì)參考。
[關(guān)鍵詞]  PPC梁  裂縫控制  規(guī)范  名義拉應(yīng)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