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(1 國(guó)網(wǎng)江蘇省電力有限公司經(jīng)濟(jì)技術(shù)研究院， 南京 210008； 2 國(guó)網(wǎng)江蘇電力設(shè)計(jì)咨詢有限公司， 南京 210008； 3 南京工業(yè)大學(xué)土木工程學(xué)院 塔桅結(jié)構(gòu)工程研究中心， 南京 211816；4 江蘇振光電力設(shè)備制造有限公司， 鎮(zhèn)江 212000)

［摘要］柔性法蘭節(jié)點(diǎn)通過(guò)內(nèi)外兩道角焊縫傳力，具有安裝快捷、加工簡(jiǎn)單且省材省時(shí)等特點(diǎn)。對(duì)柔性法蘭進(jìn)行受彎承載力試驗(yàn)，并對(duì)相應(yīng)法蘭進(jìn)行有限元模擬分析，考察柔性法蘭的受彎承載力特性，重點(diǎn)研究柔性法蘭內(nèi)外環(huán)向角焊縫的受力機(jī)理和分擔(dān)比例。研究結(jié)果表明，純彎作用下柔性法蘭受拉側(cè)外焊縫與主管連接處存在較大應(yīng)力集中，受拉側(cè)外焊縫為主要的傳力焊縫，而內(nèi)焊縫在保證柔性法蘭節(jié)點(diǎn)安全穩(wěn)定的前提下提供第二道傳力機(jī)構(gòu)；純彎受力時(shí)柔性法蘭受拉側(cè)外焊縫與內(nèi)焊縫受力分擔(dān)比例比在3.6以上，設(shè)計(jì)及加工時(shí)應(yīng)特別注意外焊縫的應(yīng)力及質(zhì)量，建議適當(dāng)減小內(nèi)焊縫焊腳尺寸至外焊縫的2/3，使法蘭焊縫構(gòu)造更加合理，該研究成果可為柔性法蘭及其焊縫設(shè)計(jì)加工提供參考。

［關(guān)鍵詞］柔性法蘭； 內(nèi)外角焊縫； 受彎承載力； 分擔(dān)比例； 有限元模擬

中圖分類號(hào)：TU392-3文獻(xiàn)標(biāo)識(shí)碼：A文章編號(hào)：1002-848X(2020)11-0070-06

Flexural bearing capacity test and weld stress analysis of flexible flange joint used in steel poles

WANG Tinghua1,2, FAN Wenfeng3, HUANG Guohuan4, LI Daijun4, ZHANG Dachang3

(1 Economic Research Institute, State Grid Jiangsu Electric Power Company, Nanjing 210008, China; 2 Jiangsu Electric Power Design Consulting Co., Ltd., Nanjing 210008, China; 3 Engineering Research Center of Tower and Mast Structure, College of Civil Engineering, Nanjing Tech University, Nanjing 211816, China; 4 Jiangsu Zhengguang Electric Power [JZ]Equipment Manufacturing Co., Ltd., Zhenjiang 212000, China.)

Abstract:The flexible flange joint transmits force through two internal and external fillet welds, which has the characteristics of fast installation, simple processing, and material and time saving. The flexural bearing capacity test of the flexible flange was carried out, and the corresponding flange was subjected to FEM simulation analysis to investigate the flexural bearing capacity characteristics of the flexible flange. The focus is on the mechanism and sharing ratio of internal and external circumferential fillet welds of the flexible flange. The research results show that there is a large stress concentration at the connection between the external weld on the tension side of the flexible flange and the main pipe under the action of pure bending; the external weld on the tension side is the main force transfer weld, and the internal weld provides a second force transmission mechanism on the premise of ensuring the safety and stability of the flexible flange joint; the stress ratio of the external weld to the internal weld on the tension side of the flexible flange under pure bending is greater than 3.6, and special consideration should be given to the design of the external weld when designing and processing. It is suggested that the size of the internal weld bead to 2/3 of the external weld be appropriately reduced to make the flange weld structure more reasonable. The research results can provide a reference for the design and processing of flexible flanges and their welds.

Keywords:flexible flange; internal and external fillet weld; flexural bearing capacity; sharing ratio; FEM simulation

*國(guó)網(wǎng)江蘇省電力公司科技項(xiàng)目（J2017055），國(guó)家自然科學(xué)基金項(xiàng)目（51678293）。

通訊作者：張大長(zhǎng)，博士，教授，Email:dczhangchina@163.com。