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（武漢理工大學(xué)土木工程與建筑學(xué)院， 武漢 430070）

［摘要］為研究橡膠減振支座對(duì)豎向車(chē)致振動(dòng)的減振效果，對(duì)某鐵路橋梁的橡膠減振支座和盆式橡膠支座進(jìn)行了現(xiàn)場(chǎng)測(cè)試，獲得了橡膠支座的時(shí)頻特性，并對(duì)比分析了不同橡膠支座對(duì)豎向車(chē)致振動(dòng)的衰減規(guī)律。測(cè)試結(jié)果表明：高速列車(chē)通過(guò)鐵路橋梁時(shí)，橡膠減振支座上、下連接板的振動(dòng)幅值均小于盆式橡膠支座的幅值，且其總插入損失較盆式橡膠支座的大3-75dB，除在設(shè)計(jì)頻率10Hz附近的振動(dòng)響應(yīng)存在放大現(xiàn)象外，在其余頻段的插入損失均表現(xiàn)出良好的衰減作用，其中優(yōu)勢(shì)頻段20～80Hz范圍內(nèi)的減振效果顯著。因此，橡膠支座作為柔性支承在一定程度上有利于減小豎向車(chē)致振動(dòng)對(duì)周邊環(huán)境的影響，特別是低剛度、高阻尼的橡膠支座，更有利于作為鐵路橋梁的減振支座。

［關(guān)鍵詞］橡膠減振支座； 現(xiàn)場(chǎng)測(cè)試； 車(chē)致振動(dòng)； 減振效果； Z振級(jí)

中圖分類(lèi)號(hào)：U248, X593文獻(xiàn)標(biāo)識(shí)碼：A文章編號(hào)：1002-848X(2019)14-0096-06

Field measurement on damping effects of elastic bearing pad for vertical train-induced vibrations

Sun Liangming, Zhao Hanbing, Xie Weiping

(School of Civil Engineering and Architecture, Wuhan University of Technology, Wuhan 430070, China)

Abstract:In order to investigate the damping effects of elastic bearing pad (EBP) for vertical train-induced vibrations, field measurements were carried out through taking a pot rubber bearing and an EBP of an actual railway bridge as test objects, the time and frequency characteristics were obtained. And the attenuation laws of different rubber bearings for vertical train-induced vibrations were comparatively analyzed. The test results show that the vibration amplitudes of EBP at both upper and lower plates are smaller than those of pot rubber bearing while the high-speed train is running through the railway bridge. The whole insertion loss of EBP is 3-75dB larger than that of pot rubber bearing. The vibration responses around the design frequency 10Hz are amplified, but the EBP can reduce more train-induced vibrations than the pot rubber bearing in the vertical direction for other vibration frequency components.  The damping effect is obvious in the range of 20~80Hz. Therefore, the rubber bearing as a flexible support to a certain degree is useful to reduce the vertical train-induced vibrations for the improvement of surrounding environment, especially the lower stiffness and higher damping rubber bearing is more advantageous to as an anti-vibration bearing in the railway bridge.

Keywords:elastic bearing pad; field measurement; train-induced vibration; damping effect; Z vibration level

*國(guó)家自然科學(xué)基金青年基金項(xiàng)目（51608410），湖北省自然科學(xué)基金面上項(xiàng)目（2016CFB272），中央高?；究蒲袠I(yè)務(wù)費(fèi)專(zhuān)項(xiàng)資金資助（2016IVA028，2019Ⅲ108CG）。

作者簡(jiǎn)介：孫亮明，博士，副教授，碩士生導(dǎo)師，Email: sunliangming@126.com。