884aa四虎影成人精品,99久久国产综合精品女图图等你,97在线观看永久免费视频,久久精品国产精品亚洲38,ⅵdeodesetv性欧美

(1 西南科技大學(xué)土木工程與建筑學(xué)院, 綿陽(yáng) 621010; 2 中建二局第一建筑工程有限公司, 北京 100176)

摘要: 某類清水混凝土大尺寸異型洞體工程對(duì)施工精度要求比普通混凝土結(jié)構(gòu)高得多,常規(guī)模板支撐體系已不能滿足該類洞體施工對(duì)內(nèi)壁的高精度要求,綜合分析選用格構(gòu)柱?H 型鋼梁框架作為該洞體模板支撐結(jié)構(gòu)體系. 對(duì)結(jié)構(gòu)進(jìn)行有限元分析,并根據(jù)模板體系裝配誤差及變位和變形進(jìn)行實(shí)時(shí)工藝微調(diào),以滿足支撐結(jié)構(gòu)體系對(duì)裝配精度的控制要求,進(jìn)行現(xiàn)場(chǎng)原位加載試驗(yàn),確定模板支撐體系的可行性. 分析結(jié)果表明:有限元分析中最大撓度為28mm,為滿足精度要求需對(duì)頂部位移較大模板實(shí)施預(yù)起拱,且對(duì)應(yīng)力及變形較大桿件進(jìn)行加強(qiáng). 試驗(yàn)中模板撓度均較小,最大撓度為 2. 82mm,滿足混凝土施工對(duì)精度指標(biāo)控制要求. 二級(jí)加載后支撐桿件上最大應(yīng)變僅為47. 3με,應(yīng)力水平較低,處于彈性工作狀態(tài). 該模板支撐結(jié)構(gòu)體系滿足高精度的大型清水混凝土洞體工程施工精度的指標(biāo)要求,能用于現(xiàn)場(chǎng)施工.

關(guān)鍵詞: 清水混凝土洞體; 鋼模板支撐結(jié)構(gòu); 高精度施工; 現(xiàn)場(chǎng)原位加載試驗(yàn)

中圖分類號(hào):TU318 文獻(xiàn)標(biāo)志碼:A 文章編號(hào):1002?848X(2022)08?0099?06

DOI:10. 19701 / j.jzjg.LS210134

Experimental study on bearing capacity of steel formwork support structure in large concrete tunnel

CHU Yunpeng1, ZHONG Yan1, SUN Xinhui1, LIU Xin2

(1 School of Civil Engineering and Architecture, Southwest University of Science and Technology, Mianyang 621010, China;2 China Construction Second Engineering Bureau First Construction Engineering Co., Ltd., Beijing 100176, China)

Abstract: The construction accuracy of a certain type of fair?faced concrete large?size special?shaped tunnel project is muchhigher than that of ordinary concrete structure, and the conventional formwork support system cannot meet the high?precision requirements of the tunnel construction on the inner wall. The lattice column?H steel beam frame was selected asthe formwork support structure system of the tunnel. The finite element analysis of the structure was carried out, and thereal?time process fine?tuning was carried out according to the assembly error, displacement and deformation of the formworksystem to meet the control requirements of the support structure system on the assembly accuracy. The in?situ load test wascarried out to determine the feasibility of the formwork support system. The results of analysis show that: the maximumdeflection in the finite element analysis is 28mm. In order to meet the accuracy requirements, it is necessary to pre?arch theformwork with large displacement at the top, and strengthen the bars with large stress and deformation. The deflection offormwork is small in the test, and the maximum deflection is 2. 82mm, which meets the requirements of precision indexcontrol in concrete construction. After secondary loading, the maximum strain of the support bar is only 47. 3 με, and thestress level is low, which is in elastic working state. The formwork support structure system meets the index requirements ofhigh precision construction accuracy of large fair?faced concrete tunnel engineering, and can be used for field construction.

Keywords:fair?faced concrete tunnel; steel formwork support system; high precision construction; in?situ load test

∗國(guó)家自然科學(xué)基金項(xiàng)目(51808466),四川省科技廳科研院所科技成果轉(zhuǎn)化項(xiàng)目(2021JDZH0036),西南科技大學(xué)實(shí)驗(yàn)技術(shù)研究項(xiàng)目(17syjs?06).

第一作者:褚云朋,博士,教授,碩士生導(dǎo)師,主要從事結(jié)構(gòu)抗震及加固改造研究,Email:chuyunpeng@ swust.edu.cn.

[引用本文] 褚云朋,鐘燕,孫鑫暉,等. 大型混凝土洞體鋼模板支撐結(jié)構(gòu)承載性能試驗(yàn)研究[ J]. 建筑結(jié)構(gòu),2022,52(8): 99?104. CHU Yunpeng, ZHONG Yan, SUN Xinhui, et al. Experimental study on bearing capacity of steelformwork support structure in large concrete tunnel[J]. Building Structure,2022,52(8): 99?104.