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（1 天津大學(xué)建筑設(shè)計(jì)規(guī)劃研究總院有限公司， 天津 300073； 2 天津大學(xué)建筑工程學(xué)院， 天津 300072； 3 山東萬(wàn)斯達(dá)建筑科技股份有限公司， 濟(jì)南 250014； 4 天津市錦正房地產(chǎn)開(kāi)發(fā)有限公司， 天津 300073）

［摘要］為研究“二階段受力”對(duì)預(yù)應(yīng)力混凝土鋼管桁架疊合板整體受力性能的影響及該新型疊合板沿預(yù)應(yīng)力方向的工作性能，進(jìn)行了3組共6塊預(yù)應(yīng)力混凝土鋼管桁架疊合板靜力試驗(yàn)，通過(guò)對(duì)比得到不同受力狀態(tài)疊合板的跨中撓度、開(kāi)裂荷載、裂縫分布、預(yù)應(yīng)力筋及混凝土的應(yīng)變等。試驗(yàn)結(jié)果表明：預(yù)應(yīng)力混凝土鋼管桁架疊合板預(yù)制底板與疊合層混凝土協(xié)同工作性能良好，疊合板在加載過(guò)程中經(jīng)歷了彈性和彈塑性兩個(gè)階段，“二階段受力”效應(yīng)減小了疊合板開(kāi)裂荷載，增大了最大裂縫寬度。經(jīng)理論分析可知，疊合板彈性階段剛度按《混凝土結(jié)構(gòu)設(shè)計(jì)規(guī)范》（GB 50010—2010）計(jì)算值與實(shí)測(cè)值吻合較好且偏于安全，開(kāi)裂后剛度按《公路鋼筋混凝土及預(yù)應(yīng)力混凝土橋涵設(shè)計(jì)規(guī)范》（JTG 3362—2018）計(jì)算與實(shí)測(cè)值最為接近。

［關(guān)鍵詞］二階段受力；預(yù)應(yīng)力混凝土； 鋼管桁架疊合板；靜力試驗(yàn)；彈性階段剛度

中圖分類號(hào)：TU398-7文獻(xiàn)標(biāo)識(shí)碼：A文章編號(hào)：1002-848X(2021)05-0080-06

Experimental study  on the mechanical behavior of prestressed concrete steel pipe truss composite slabs  under the influence of secondary force

YU Jinghai1,2, HE Mengjie2, ZHANG Shuhui3, ZHAO Yuyang4, TANG Yuxuan2

(1 Tianjin University Research Institute of Architectural Design and Urban Planning Co., Ltd., Tianjin 300073, China; 2 School of Civil Engineering, Tianjin University, Tianjin 300072, China; 3 Shandong One Star Construction Technology Co., Ltd., Jinan 250014, China; 4 Tianjin Jinzheng Real Estate Development Co., Ltd., Tianjin 300073, China)

Abstract:In order to study the influence of “secondary force” on the overall mechanical behavior of prestressed concrete steel pipe truss slabs and the working performance of this new type  composite slabs along the prestressing direction, the static test of three groups of six prestressed concrete steel pipe  truss composite slabs were constructed. The mid-span deflection, cracking load, crack distribution, prestressing tendons and concrete strain of the composite slabs with different stress states were obtained by comparison. The test results show that the prestressed concrete steel pipe truss composite composite slab prefabricated floor and the laminated concrete have good working performance. The composite slab experienced two stages of elasticity and elastoplasticity during the loading process. The “secondary force” effect reduces the cracking load of the composite slab and increases the maximum crack width. According to the theoretical analysis, the stiffness in the elastic stage of the composite slab is in good agreement with the measured value according to  Code for design of concrete structures(GB 50010—2010), the measured value of  stiffness after cracking is the closest to that calculated according to Code for design of highway reinforced concrete and prestressed concrete bridges and culverts (JTG 3362—2018).

Keywords:secondary force; prestressed concrete; steel pipe truss composite slab;static test;elastic stage stiffness

*天津市創(chuàng)新創(chuàng)業(yè)團(tuán)隊(duì)特殊支持項(xiàng)目（TJTZJH-GCCCXCYTD-1-3）。

作者簡(jiǎn)介：于敬海，博士，研究員，Email:yjh300072@163.com。