（1 湖南中大建設(shè)工程檢測(cè)技術(shù)有限公司,長(zhǎng)沙 410205； 2 湖南中加土木工程加固技術(shù)有限公司,長(zhǎng)沙 410205；3湖南大學(xué)土木工程學(xué)院，長(zhǎng)沙 410012；）

[摘要]某高速公路大型收費(fèi)站收費(fèi)大棚由弧線形主網(wǎng)架和橢圓殼形雨棚網(wǎng)架兩部分組成，通過(guò)鋼管混凝土柱-鋼牛腿節(jié)點(diǎn)連接。該工程在使用過(guò)程中存在安全問(wèn)題，為確保安全性，現(xiàn)場(chǎng)對(duì)網(wǎng)架結(jié)構(gòu)進(jìn)行詳細(xì)檢測(cè)。在現(xiàn)場(chǎng)檢測(cè)的基礎(chǔ)上，利用MIDAS/GEN有限元軟件建立兩個(gè)網(wǎng)架的桁架系計(jì)算模型，進(jìn)行結(jié)構(gòu)強(qiáng)度、整體變形和考慮初始缺陷的非線性屈曲分析。利用ABAQUS軟件建立鋼管混凝土柱-鋼牛腿節(jié)點(diǎn)三維實(shí)體非線性有限元模型，由于受銹蝕及焊縫質(zhì)量影響，牛腿部位出現(xiàn)承載力不足。兩個(gè)網(wǎng)架的安全性鑒定等級(jí)綜合評(píng)定均為C_su級(jí)，均不符合國(guó)家現(xiàn)行標(biāo)準(zhǔn)規(guī)范的要求。根據(jù)判定結(jié)果并結(jié)合實(shí)際情況，采用新增加強(qiáng)環(huán)和腹板的方式對(duì)鋼管混凝土柱-鋼牛腿節(jié)點(diǎn)進(jìn)行加固處理，加固后鋼牛腿的承載力得到顯著提升，結(jié)構(gòu)的安全狀況得到改善。由于鋼管對(duì)核心混凝土的約束作用增強(qiáng)，混凝土第三主應(yīng)力出現(xiàn)輕微的提高，但未超過(guò)混凝土軸心抗壓強(qiáng)度標(biāo)準(zhǔn)值。本文的研究成果可以為類似工程提供參考。

[關(guān)鍵詞] 網(wǎng)架結(jié)構(gòu);檢測(cè)鑒定;有限元;加固設(shè)計(jì)

中圖分類號(hào)：TU356      文獻(xiàn)標(biāo)識(shí)碼：A       文章編號(hào)：1002-848X（）

作者簡(jiǎn)介：李剛，碩士，工程師，Email :303857385@qq.com；談忠坤，博士，高級(jí)工程師，一級(jí)注冊(cè)結(jié)構(gòu)工程師，Email :175336988@qq.com。

Evaluation and strengthening design for a large toll station grid structure

Li Gang ¹, Tan Zhongkun^1,2,3,Wang Youlin¹, Guo Qiwu¹ , Liang Bo¹, Tian Dailiang¹

(1 Hunan Zhong Da Construction Engineering Testing Technology Co.，Ltd.， Changsha 410205，China; 2 Hunan Zhong Jia Civil Engineering Strengthening Technology Co.，Ltd., Changsha 410205，China; 3School of Civil Engineering, Hunan University, Changsha 410012，China)

Abstract:A Large toll station grid structure on highway was composed of arc shaped main grid and ellipse shell shaped canopy structure and the two part of grid structures were connected by concrete-filled steel tubular stub columns and steel corbel(CFST-SC). Problems of structure were found in the process of using. In order to ensure the safety, a detailed inspection of the grid structure was done on site. On the basis of field tests, MIDAS/GEN was used to establish the finite truss model of two part of grid structures. Strength calculation, Deformation and Stability with original defects were discussed. ABAQUS was used to establish the 3D finite model to analyze the stress of CFST-SC. The capacity of corbel was low as the effects of corrosion and welding quality. Both of the two grid structures safety evaluation appraisal were C_su level, Which were not consistent with existing national standards requirements. According to the evaluation results and actual situation, CFST-SC was reinforced by adding stiffening ring and web. After reinforcement, the bearing capacity of steel corbel was greatly improved and the structural safety was increased. Due to the restriction effect from steel to concrete, the third principal stress of concrete was slightly improved but not exceed the standard value of concrete axial compressive strength.The conclusion of this paper could give recommendations for similar projects.

Keywords: grid structure; evaluation; finite ;strengthening design

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