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(1 重慶交通大學(xué)土木工程學(xué)院, 重慶 400074; 2 中國建筑科學(xué)研究院有限公司, 北京 100013;3 金科新能源有限公司, 北京 100102)
摘要: 為研究風(fēng)電塔筒裝配式基礎(chǔ)采用的鋼筋環(huán)形搭接后澆段連接節(jié)點(diǎn)的受彎性能,進(jìn)行了 3 個(gè)采用后澆段連接的預(yù)制混凝土試件和 1 個(gè)現(xiàn)澆混凝土試件的受彎試驗(yàn),分析了采用不同后澆段寬度及插銷鋼筋直徑的預(yù)制試件的破環(huán)模式、承載力、變形能力及裂縫,并與現(xiàn)澆試件進(jìn)行了對比。 結(jié)果表明:采用后澆段連接的預(yù)制試件的裂縫最先出現(xiàn)在結(jié)合面處,且開裂荷載顯著小于現(xiàn)澆試件相應(yīng)值,最大裂縫寬度發(fā)生于結(jié)合面處且顯著大于現(xiàn)澆試件相應(yīng)值;極限承載力達(dá)到現(xiàn)澆試件相應(yīng)值的 86% ~ 96%,且試驗(yàn)值與規(guī)范計(jì)算值之比均大于 1. 2,后澆段連接能夠有效傳力且可采用規(guī)范公式計(jì)算其受彎承載力;搭接長度為 0. 35la( la 為錨固長度) 時(shí),增大插銷鋼筋直徑有助于搭接傳力,能更充分地發(fā)揮連接節(jié)點(diǎn)的承載能力及變形能力;基于連接節(jié)點(diǎn)受力機(jī)理提出了最大裂縫寬度實(shí)用計(jì)算方法,計(jì)算結(jié)果與試驗(yàn)結(jié)果總體吻合良好且略偏于安全。
關(guān)鍵詞: 鋼筋環(huán)形搭接; 后澆段; 受彎性能; 裂縫寬度; 試驗(yàn)研究
中圖分類號:TU375 文獻(xiàn)標(biāo)志碼:A 文章編號:1002-848X(2022)13-0120-08
DOI:10. 19701 / j. jzjg. 20200967
Experimental study on flexural behavior of post-cast segment joint with loop lapped reinforcements
HU Chen1, ZHOU Jian2, TIAN Chunyu2, ZHANG Heming3
(1 College of Civil Engineering, Chongqing Jiaotong University, Chongqing 400074, China; 2 China Academy of Building Research Co. , Ltd. , Beijing 100013, China; 3 Jinke New Energy Co. , Ltd. , Beijing 100102, China)
Abstract:In order to study the flexural behavior of post-cast segment joint with loop lapped reinforcements used in wind turbine tower’ s precast foundation, the flexural tests of three precast concrete specimens with post-cast segment joint and one cast-in-situ concrete specimen were carried out. The failure mode, load-bearing capacity, deformation capacity and cracks of the precast specimen with different width of post-cast segment and diameter of bolt reinforcement were analyzed, and compared with the cast-in-situ specimen. The results show that the cracks of the precast specimen with post-cast segment appear at the joint interface firstly, and the cracking load is significantly less than the corresponding value of the cast-in-situ specimen. The maximum crack of the precast specimen occurs at the joint interface and is significantly greater than the corresponding value of the cast-in-situ specimen. The ultimate load-bearing capacity of the precast specimen can reach 86% ~ 96% of the cast-in-situ specimen’ s value, and the ratio of the experimental value to the code calculated value is greater than 1. 2. The post-cast segment joint can transfer force effectively and the flexural bearing capacity can be calculated by the code’ s formula. When the lap splice length is 0. 35 la ( la is the anchorage length) , increasing the diameter of bolt reinforcement is helpful to force transmission, which can give better play to the load-bearing capacity anddeformation capacity of the joint. Based on the joint mechanical mechanism, a practical calculation method of maximum crack width is proposed, the calculated results are in good agreement with the experimental results and are slightly safer.
Keywords:loop lap splice of reinforcement; post-cast segment; flexural behavior; crack width; experimental study
∗寧波市電力設(shè)計(jì)院有限公司科技項(xiàng)目(裝配式 UHPC 高性能變電站技術(shù)體系研發(fā)) (KJCX003) 。
第一作者:胡晨,碩士,主要從事結(jié)構(gòu)設(shè)計(jì)與研究,Email:825845722@ qq. com。
通信作者:周劍,碩士,工程師,主要從事新型建筑工業(yè)化結(jié)構(gòu)技術(shù)研究,Email:zhoujian@ cabrtech. com。
[引用本文] 胡晨,周劍,田春雨,等. 鋼筋環(huán)形搭接后澆段連接節(jié)點(diǎn)受彎性能試驗(yàn)研究[ J] . 建筑結(jié)構(gòu),2022,52(13) :120-127. HU Chen,ZHOU Jian,TIAN Chunyu,et al. Experimental study on flexural behavior of post-cast segmentjoint with loop lapped reinforcements[ J] . Building Structure,2022,52(13) :120-127.
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