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(1 華南理工大學(xué)土木與交通學(xué)院， 廣州 510640； 2 華南理工大學(xué)亞熱帶建筑科學(xué)國(guó)家重點(diǎn)實(shí)驗(yàn)室， 廣州 510640）

［摘要］采用1∶3縮尺比例設(shè)計(jì)了兩個(gè)不同高度的放射性空間V型橋墩節(jié)點(diǎn)，對(duì)其進(jìn)行豎向擬靜力加載試驗(yàn)。試驗(yàn)結(jié)果表明：鋼管墩、下弦主管、下弦管、加勁肋之間的焊縫處均是節(jié)點(diǎn)上部結(jié)構(gòu)的薄弱部位，而節(jié)點(diǎn)整體的薄弱部位為混凝土底座。采用軟件ABAQUS進(jìn)行有限元數(shù)值模擬，對(duì)節(jié)點(diǎn)進(jìn)行受力機(jī)理以及參數(shù)化分析。結(jié)果表明：上部加勁肋、平聯(lián)鋼管對(duì)節(jié)點(diǎn)豎向承載力貢獻(xiàn)較大； 鋼管墩壁厚、直徑對(duì)節(jié)點(diǎn)豎向承載力影響較大，而混凝土強(qiáng)度等級(jí)、平聯(lián)鋼管截面尺寸、加勁肋厚度對(duì)節(jié)點(diǎn)豎向承載力影響較?。?將原節(jié)點(diǎn)底座改為加入H型鋼的底座能有效解決底座構(gòu)造復(fù)雜的問(wèn)題。

［關(guān)鍵詞］放射性空間V型橋墩節(jié)點(diǎn)； 擬靜力試驗(yàn)；  受力機(jī)理； 豎向承載性能； 節(jié)點(diǎn)優(yōu)化

中圖分類號(hào)：TU391文獻(xiàn)標(biāo)識(shí)碼：A文章編號(hào)：1002-848X(2020)22-0125-05

Research on vertical bearing performance of radioactive space V-shaped pier joints

DUAN Dezhang1, CHEN Lei1, PAN Jianrong1,2, WANG Zhan1,2, WANG Peng1

（1 School of Civil Engineering and Transportation, South China University of Technology, Guangzhou 510640, China;2 State Key Laboratory of Subtropical Building Science, South China University of Technology, Guangzhou 510640, China）

Abstract:Two radioactive space V-shaped pier joints with different height were designed with a 1:3 scale ratio to perform vertical pseudo-static loading tests. The test results indicate that the welds between the steel pipe pier, lower chord main pipe, lower chord pipe, and stiffeners are the weak part of the upper structure of the joint and the weak part of the whole joint is the concrete base. The software ABAQUS was used to carry out finite element numerical simulation, and the force mechanism and parameter analysis of the joints were carried out. The results indicate that the upper stiffeners and flat steel pipes have a greater contribution to the vertical bearing capacity of the joints; the wall thickness and diameter of the steel pipe piers have a greater influence on the vertical bearing capacity of the joints, while the concrete strength grade, the cross-section size of the flat steel pipes, and the thickness of the stiffeners has little influence on the vertical bearing capacity of the joints, and replacing original joint base with adding H-shaped steel can effectively solve the problem of complex structure.

Keywords:radioactive space V-shaped pier joint; pseudo-static loading test; force mechanism; vertical bearing performance; joint optimization

*國(guó)家自然科學(xué)基金項(xiàng)目（51638009, 51778241）,亞熱帶建筑科學(xué)國(guó)家重點(diǎn)實(shí)驗(yàn)室基金項(xiàng)目（2017ZB28, 2017KD22），廣東省基礎(chǔ)與應(yīng)用基礎(chǔ)研究基金 (2020A1515011307)。

作者簡(jiǎn)介：段德章，碩士，Email: 970744897@qq.com； 通信作者：潘建榮，博士，教授，Email: ctjrpan@scut.edu.cn。