本文選題：循環(huán)荷載　切入點(diǎn)：飽和混凝土　出處：《土木建筑與環(huán)境工程》2017年06期 　論文類型：期刊論文

【摘要】：為研究有壓水環(huán)境中循環(huán)荷載歷史對(duì)混凝土動(dòng)態(tài)力學(xué)性能的影響,對(duì)歷經(jīng)不同荷載循環(huán)次數(shù)(0、25、50、100次)的水飽和混凝土試件(在2 MPa圍壓水環(huán)境中)進(jìn)行了不同應(yīng)變速率(10-5、10-4、10-3、10-2/s)下的常規(guī)三軸靜動(dòng)態(tài)壓縮試驗(yàn),分析了混凝土材料的峰值應(yīng)力、峰值應(yīng)變、彈性模量、吸能能力等基本力學(xué)參數(shù)的變化規(guī)律和機(jī)理。結(jié)果表明:同一加載速率下,水飽和混凝土的峰值應(yīng)力、彈性模量和吸能能力均隨循環(huán)次數(shù)的增長(zhǎng)呈現(xiàn)出先增大后減小的規(guī)律,并且峰值應(yīng)力和吸能能力增減的轉(zhuǎn)折點(diǎn)隨著應(yīng)變速率的提高而向荷載循環(huán)次數(shù)增大的方向平移,峰值應(yīng)變整體上呈減小的趨勢(shì);相同荷載循環(huán)次數(shù)后,峰值應(yīng)力、峰值應(yīng)變和吸能能力隨著加載速率的增大而逐漸增大,并且荷載循環(huán)次數(shù)越大,率效應(yīng)越顯著,彈性模量隨著加載速率的增大而逐漸較小。
[Abstract]:In order to study the influence of cyclic load history on dynamic mechanical properties of concrete in pressurized water environment, The conventional triaxial static and dynamic compression tests at different strain rates (10 ~ (-5) ~ 10 ~ (-4) ~ 10 ~ (-3) ~ 10 ~ (-2) / s) of saturated concrete specimens (in 2 MPa confined water environment) have been carried out, and the peak stress and strain of concrete materials have been analyzed. The change law and mechanism of basic mechanical parameters, such as elastic modulus, energy absorption ability, etc. The results show that under the same loading rate, the peak stress of water-saturated concrete, The elastic modulus and energy absorption capacity increase first and then decrease with the increase of cycle times, and the turning point of peak stress and energy absorption capacity increase and decrease with the increase of strain rate, and the turning point of the increase of load cycle times shifts to the direction of increasing load cycle times with the increase of strain rate. The peak stress, peak strain and energy absorption capacity gradually increase with the increase of loading rate, and the greater the load cycle times, the more significant the rate effect, after the same load cycles, the peak stress, the peak strain and the energy absorption ability increase with the increase of loading rate. The elastic modulus decreases with the increase of loading rate.
【作者單位】： 三峽大學(xué)三峽地區(qū)地質(zhì)災(zāi)害與生態(tài)環(huán)境湖北省協(xié)同創(chuàng)新中心土木與建筑學(xué)院;
【基金】：國(guó)家自然科學(xué)基金(51279092) 三峽大學(xué)研究生科研創(chuàng)新基金(SDYC2016018)~~
【分類號(hào)】：TU528

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