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（1 哈爾濱工業(yè)大學(xué)土木工程學(xué)院, 哈爾濱 150090； 2 哈爾濱工業(yè)大學(xué)結(jié)構(gòu)工程災(zāi)變與控制教育部重點(diǎn)實(shí)驗(yàn)室, 哈爾濱 150090）
［摘要］為滿足某7層辦公樓改造為公寓式賓館所需增設(shè)兩部電梯的要求，需在該房屋的寬11-7m、長13-2m的無粘結(jié)預(yù)應(yīng)力混凝土板角部開設(shè)2-28m×4-25m洞口。改造需要解決兩個(gè)關(guān)鍵問題。一是構(gòu)建電梯井道結(jié)構(gòu)，擬開洞口邊后置了混凝土框架，待后置框架結(jié)構(gòu)形成后，采用“先錨后斷”技術(shù)，實(shí)現(xiàn)擬開洞口區(qū)域的板內(nèi)雙向預(yù)應(yīng)力筋在后置梁上的永久錨固，并保證開洞后板內(nèi)無粘結(jié)筋的有效預(yù)應(yīng)力水平，最后，逐步剔除各層擬開洞區(qū)域混凝土及非預(yù)應(yīng)力筋，完成洞口開設(shè)；二是針對開洞后的預(yù)應(yīng)力板由四邊支承矩形板轉(zhuǎn)變?yōu)榻遣咳笔У漠愋伟澹治隽碎_洞后預(yù)應(yīng)力板彎矩分布，介紹了CFRP加固的思路和實(shí)施方案。
［關(guān)鍵詞］無粘結(jié)預(yù)應(yīng)力； 混凝土； 開洞； 改造； 加固
中圖分類號：TU378-5文獻(xiàn)標(biāo)識碼：A文章編號：1002-848X(2018)01-0050-04
Strengthening and opening retrofitting of post-tensioned plates prestressed with unbonded tendons
Zhou Wei1,2, Lu Siwei1,2, Liu Xuanchi1,2
(1 School of Civil Engineering, Harbin Institute of Technology, Harbin 150090, China; 2 Key Lab of Structures Dynamic Behavior and Control, Harbin Institute of Technology, Harbin 150090, China)
Abstract:Two elevators will be arranged in an apartment hotel, which was retrofitted by a 7-story office building. Thus the rectangular opening (2-28m×4-25m) for elevators shaft needs to be post-built in the corner of the post-tensioned concrete plate, which is a rectangular plate having 11-7m-width and 13-2m-length. There are two essential issues required to be solved. One is to construct elevator shaft. Reinforced concrete frames were applied to strengthen the plate with opening. After the frame was built, “cut off after anchoring” method was used, to achieve the unbonded tendon in two directions succeed to anchor to post-built beams, and to ensure the effective prestress level of the unbonded tendon in the opening plate. Finally, the concrete and steel bars in the openings were progressively demolished; The other one is to concentrate on post-tensioned plates whose supporting conditon was converted from four-edges simple support to six-edges support after opening.The moment distribution of the post-tensioned plate without a corner was complicated compared to the plate originally simply supported in the brick walls. The scheme and details for CFRP strengthening of the opening plate were described.
Keywords:unbonded prestressing; concrete; opening; retrofitting; strengthening
*國家自然科學(xué)基金項(xiàng)目（51778186），中央高?；究蒲袠I(yè)務(wù)費(fèi)專項(xiàng)資金資助(HIT.KISTP.201428)，國家重點(diǎn)研發(fā)計(jì)劃資助（2017YFC0806100)。
作者簡介：周威，博士，副教授，博士生導(dǎo)師，Email:zhouwei-hit@163.com。
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