本文關(guān)鍵詞： 沖擊荷載 振動(dòng) 破壞 重力壩　出處：《振動(dòng)與沖擊》2017年09期 　論文類型：期刊論文

【摘要】：采用逐級(jí)遞增循環(huán)均勻沖擊加載方式,研究重力壩模型的破壞特征、自振頻率與模態(tài)振型變化規(guī)律、最大加速度響應(yīng)與沖擊能間關(guān)系。試驗(yàn)表明,隨著沖擊能的增加,壩體依次出現(xiàn)砂漿掉皮、掉皮區(qū)擴(kuò)大、上部細(xì)小裂縫、上部裂縫擴(kuò)展及貫通、上部壩體斷裂、中部細(xì)小裂縫、中部裂縫擴(kuò)展及貫通、中部壩體斷裂;自振頻率隨沖擊能增加而降低,沖擊后模態(tài)振型前二階變化較小,第三階變化較大;沖擊作用下壩頸最大加速度響應(yīng)最大;響應(yīng)趨勢(shì)與損傷程度有關(guān),沖擊能逐漸增加,無損傷或損傷較輕部位響應(yīng)依次為增加、減小、變化不大或略有增加,損傷較重部位依次為略有降低、增加、減小、變化不大或略有增加。
[Abstract]:The failure characteristics of gravity dam model, the variation law of natural vibration frequency and modal mode, and the relationship between maximum acceleration response and impact energy are studied by means of stepwise incremental cyclic uniform impact loading. The experimental results show that the failure characteristics of gravity dam model increase with the increase of impact energy. The dam body in turn appears mortar peeling out, the area of falling skin expands, the upper part of small crack, the upper crack spread and through, the upper dam body breaks, the middle part crack, the middle crack expands and passes through, the middle part dam body breaks; The frequency of natural vibration decreases with the increase of impact energy, the change of the first second order of modal mode is small, the third order changes greatly after impact, the maximum acceleration response of dam neck is the largest under impact, and the response trend is related to the degree of damage, and the impact energy increases gradually. The response of non-injury or light damage sites increased, decreased, changed little or slightly increased, and the damage heavier parts decreased, increased, decreased, changed little or slightly increased in turn.
【作者單位】： 南京水利科學(xué)研究院;水利部水科學(xué)與水工程重點(diǎn)實(shí)驗(yàn)室;
【基金】：國家自然科學(xué)基金資助項(xiàng)目(51179107)
【分類號(hào)】：TV131.6
，

本文編號(hào)：1551676