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白崇喜1，張博一2，侯曉萌2

（1 東北農(nóng)業(yè)大學(xué)水利與建筑學(xué)院， 哈爾濱 150030； 2 哈爾濱工業(yè)大學(xué)土木工程學(xué)院， 哈爾濱 150090）

 

［摘要］利用無(wú)粘結(jié)CFRP筋部分預(yù)應(yīng)力混凝土連續(xù)梁板全過(guò)程分析程序的計(jì)算結(jié)果，探討CFRP筋彈性模量、預(yù)應(yīng)力筋配筋指標(biāo)、非預(yù)應(yīng)力筋配筋指標(biāo)、加載方式、跨高比、跨中與中支座相應(yīng)控制截面配筋指標(biāo)差異等參數(shù)對(duì)連續(xù)梁板中無(wú)粘結(jié)CFRP筋極限應(yīng)力增量的影響規(guī)律，進(jìn)而確定影響無(wú)粘結(jié)CFRP筋極限應(yīng)力增量的關(guān)鍵參數(shù)。基于仿真分析結(jié)果，以關(guān)鍵參數(shù)為自變量建立了連續(xù)梁板中無(wú)粘結(jié)CFRP筋極限應(yīng)力增量的計(jì)算公式，可以此為依據(jù)計(jì)算連續(xù)梁板的受彎承載力。

［關(guān)鍵詞］預(yù)應(yīng)力混凝土； 連續(xù)梁板； 無(wú)粘結(jié)CFRP筋； 極限應(yīng)力

中圖分類號(hào)：TU378,TU311.41      文獻(xiàn)標(biāo)識(shí)碼：A      文章編號(hào)：1002-848X(2013)14-0083-04

 

Bai Chongxi1, Zhang Boyi2, Hou Xiaomeng2

（1 School of Water Conservancy and Building, Northeast Agricultural University, Harbin 150030, China; 2 School of Civil Engineering, Harbin Institute of Technology, Harbin 150090, China）

 

Abstract: Based on the results of full-range analysis programs of partially prestressed concrete continuous beams and slabs with unbonded CFRP tendons, the basic factors such as modulus of elasticity for CFRP tendon, prestressing reinforcement index, non-prestressed reinforcement index, loading type, ratio of span to height, the difference between combined reinforcement index of intermediate support section and that of mid-span section affecting the law of ultimate stress increment of unbonded CFRP tendons were presented. Key factors which have major effect on ultimate stress increment of unbonded CFRP tendons were defined. Based on the results of simulation analysis, taking key parameters as independent variable, the calculation formulas of ultimate stress increment of unbonded CFRP tendons in continuous beams and slabs were proposed, and they can provide the basis for correctly calculating flexural load bearing capacity of continuous beams and slabs.

Keywords: prestressed concrete; continuous beam and slab; unbonded CFRP tendon; ultimate stress

*黑龍江省教育廳科學(xué)技術(shù)研究項(xiàng)目資助（12521007），黑龍江省博士后資助經(jīng)費(fèi)資助（LBHZ12043）。

作者簡(jiǎn)介：白崇喜，博士，一級(jí)注冊(cè)結(jié)構(gòu)工程師，Email：bcxzcx@163.com。

 

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［3］張建偉, 鄧宗才, 杜修力, 等. 預(yù)應(yīng)力FRP在混凝土結(jié)構(gòu)中的應(yīng)用研究與發(fā)展［J］. 世界地震工程, 2006, 22(1): 133-139.

［4］ACI 440. 4R-04 Prestressing concrete structures with FRP tendons［S］.

［5］HARAJLI M H, HIJAZI S A. Evaluation of the ultimate steel stress in partially prestressed concrete members［J］. PCI Journal, 1991, 36(1): 62-82.

［6］NAAMAN A E, ALKHAIRI F M. Stress at ultimate in unbonded post-tensioning tendons: part 2-proposed methodology［J］. ACI Structural Journal, 1991, 88(5): 683-692.

［7］白崇喜. 無(wú)粘結(jié)CFRP筋部分預(yù)應(yīng)力混凝土梁板設(shè)計(jì)方法研究［D］. 哈爾濱：哈爾濱工業(yè)大學(xué), 2010.

［8］程?hào)|輝, 鄭文忠. 無(wú)粘結(jié)CFRP筋部分預(yù)應(yīng)力混凝土連續(xù)梁試驗(yàn)與分析［J］. 復(fù)合材料學(xué)報(bào), 2008, 25(5): 104-113.