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（中國(guó)鐵建投資集團(tuán)有限公司， 北京 100855）

［摘要］選取在役某系桿拱橋進(jìn)行動(dòng)力試驗(yàn)研究，試驗(yàn)主橋跨徑布置為(55+260+55)m，采用剛拱柔梁體系，拱肋為主承重結(jié)構(gòu)。在試驗(yàn)橋梁梁端、1/8跨、1/4跨、1/2跨、3/4跨、7/8跨處布置橫向和豎向傳感器，分別進(jìn)行了脈動(dòng)試驗(yàn)和強(qiáng)迫振動(dòng)試驗(yàn)研究。通過(guò)現(xiàn)場(chǎng)試驗(yàn)和試驗(yàn)結(jié)果分析，得到了橋梁的自振頻率、振型、阻尼比等特性。試驗(yàn)結(jié)果表明，試驗(yàn)橋梁自振頻率等特性滿足要求，不管是脈動(dòng)試驗(yàn)還是強(qiáng)迫振動(dòng)試驗(yàn)，橋梁均是安全的。

［關(guān)鍵詞］系桿拱橋； 動(dòng)力試驗(yàn)； 自振頻率； 振型； 阻尼比

中圖分類號(hào)： TU212，TH213.3 文獻(xiàn)標(biāo)識(shí)碼： A文章編號(hào)：  1002-848X(2016)S1-0537-05

Dynamic test study on a tied arch bridge

Wang Hui

 (China Railway Construction Investment Group Co., Ltd., Beijing 100855, China)

Abstract: Dynamic test was done on one tied arch bridge with the span of (55+260+55)m. Steel arch and flexible beam system was adopted and the arch rib is the main load-bearing parts. Pulsating and forced vibration test were carried out of the horizontal and vertical sensors arranged on the span of 1/8, 1/4, 1/2, 3/4, 7/8 and the beam ends. From the field experiments and results analyses, it shows that the natural frequencies, modes, modal damping ratio and other characteristics were obtained. The results indicate that the natural vibration characteristics meet the requirements. Whether it is forced or pulsating vibration, the bridge is safe.

Keywords: tied arch bridge; dynamic test; natural frequency; mode; modal damping ratio

作者簡(jiǎn)介： 王輝，碩士，工程師，Email：huiwang_b@163.com。