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（河南科技大學(xué)土木工程學(xué)院， 洛陽(yáng) 471023）

［摘要］某教學(xué)樓采用框架-剪力墻結(jié)構(gòu)體系，地下1層頂部布置的跨度為32-6m大跨梁，因承擔(dān)0-5m厚的覆土、自重和活載，其撓度和裂縫較大，故大跨梁采用有粘結(jié)預(yù)應(yīng)力技術(shù)。在重點(diǎn)研究解決張拉預(yù)應(yīng)力筋時(shí)預(yù)加力對(duì)擋土墻、窗井墻的內(nèi)力影響較大的難題。在設(shè)計(jì)方面，采用邊跨梁預(yù)應(yīng)力筋張拉端布置在形心處，達(dá)到減小張拉端附加彎矩的影響；在施工方面，通過(guò)優(yōu)化結(jié)構(gòu)的施工順序，采用主體整澆，擋土墻和窗井墻留縫后澆，配合預(yù)應(yīng)力梁的施工，能夠得到安全適用、經(jīng)濟(jì)合理的結(jié)構(gòu)體系。

［關(guān)鍵詞］有粘結(jié)預(yù)應(yīng)力； 大跨度梁； 擋土墻； 窗井墻

中圖分類(lèi)號(hào)：TU378文獻(xiàn)標(biāo)識(shí)碼：A文章編號(hào)：1002-848X(2016)23-0091-04

Research on design and construction technology of underground large-span pre-stressed concrete beams

Guo Erwei， Jiao Yufeng， Chen Xi， Xie Lei， Chen Huanxia

(School of Civil Engineering, Henan University of Science and Technology， Luoyang 471023, China)

Abstract:Reinforced concrete frame-shear wall structural system was adopted in a teaching building project. A 32-6m large-span beam located at the top of the first underground floor bears covering soil of 0-5m thickness, dead loads and live loads, so it has large deflection and crack width. Bonded pre-stressed technology was adopted in the large-span beam. The research was focused on how to tackle large influence pre-stress in pre-tension process of pre-stressed tendons on internal forces of retaining walls and window well walls.In terms of design, the tensioned end of prestressing tendons of side span beam was arranged at the center of  the beam so as to reduce the influence of the additional bending moment.  In the construction, by optimizing the construction sequence of the structure, integral casting was adopted in the overall structure and seams were left in retaining walls and window well walls for post-pouring, to combine with the construction of pre-stressed beams. Overall, a safe, applicable, and economic reasonable structural system is obtained.

Keywords:bonded pre-stressed； large-span beam； retaining wall； window well wall

*國(guó)家自然科學(xué)基金項(xiàng)目資助(51508164)，河南科技大學(xué)博士啟動(dòng)基金資助(13480028)。

作者簡(jiǎn)介：郭二偉, 博士, 講師， Email：guollwei@126.com。