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    朱爾玉    （北方交通大學(xué) 北京 100044）

[提要] 給出了20根矩形截面無(wú)粘結(jié)部分預(yù)應(yīng)力混凝土疊合梁（其中2根為對(duì)比梁）裂縫寬度的試驗(yàn)研究成果。在此基礎(chǔ)上，結(jié)合無(wú)粘結(jié)部分預(yù)應(yīng)力混凝土梁及普通混凝土疊合梁的已有成果，提出了與混凝土結(jié)構(gòu)設(shè)計(jì)規(guī)范相對(duì)應(yīng)的一套裂縫寬度控制計(jì)算公式。通過(guò)把無(wú)粘結(jié)部分預(yù)應(yīng)力混凝土梁、疊合梁及有粘結(jié)部分預(yù)應(yīng)力混凝土梁、疊合梁的計(jì)算方法銜接起來(lái)，形成了統(tǒng)一的計(jì)算體系。經(jīng)試驗(yàn)結(jié)果驗(yàn)證，這些公式計(jì)算精度較高，可滿(mǎn)足工程設(shè)計(jì)要求。
[關(guān)鍵詞] 無(wú)粘結(jié)部分預(yù)應(yīng)力混凝土 疊合梁 裂縫寬度

Author presents the experimental results of the crack widths of 20 unbonded partial prestressed concrete composite beams with rectangular cross-sections. According to the research results of unbonded partial prestressed concrete beams and reinforced concrete composite beams, one kinds of crack width formulas of unbonded partial prestressed concrete composite beams is proposed, which links up with the Chinese Code. The recommended formula is in one kind of unified calculate model by combine bonded and unbonded partial prestressed concrete beams as well as composite beams. Compared with the experimental results, the offered formula is in highly precision, which can be used in engineering.
Keywords: unbonded partial prestressed concrete; composite beams; crack width