循環(huán)荷載后圍壓水對(duì)混凝土力學(xué)特性影響
發(fā)布時(shí)間：2019-01-16 07:32
【摘要】：對(duì)不同圍壓(0,2,5,10MPa)下的水飽和混凝土試件,歷經(jīng)25次循環(huán)荷載作用后(荷載下限140kN,上限260kN,頻率0.1Hz),進(jìn)行了不同加載速率(地震荷載作用下的混凝土應(yīng)變速率響應(yīng)范圍10~(-5)/s~10~(-2)/s)下的靜動(dòng)態(tài)常三軸抗壓性能試驗(yàn)。分析了混凝土峰值應(yīng)力、峰值應(yīng)變以及損傷特性。結(jié)果表明:歷經(jīng)循環(huán)荷載后,隨著加載速率的增加,混凝土峰值應(yīng)力增大,峰值應(yīng)變整體上逐漸增大,損傷變量D增長(zhǎng)速度減緩;隨著圍壓增加,混凝土峰值應(yīng)力和峰值應(yīng)變逐漸增大,損傷變量D增長(zhǎng)速度降低,但損傷極限差值越來(lái)越大。基于上述試驗(yàn)結(jié)果,得到了歷經(jīng)荷載循環(huán)后混凝土動(dòng)態(tài)峰值應(yīng)力與圍壓、加載速率有關(guān)的經(jīng)驗(yàn)計(jì)算式及歷經(jīng)荷載循環(huán)后混凝土動(dòng)態(tài)峰值應(yīng)變與圍壓、加載速率有關(guān)的經(jīng)驗(yàn)式。
[Abstract]:Water saturated concrete specimens under different confining pressures (0 ~ 2 ~ 5 ~ 5 ~ 10 MPA) were subjected to 25 cycles of cyclic loading (the lower limit of the load was 140 KN, the upper limit of 260 KN, the frequency of 0.1Hz). The static and dynamic triaxial compression tests of concrete under different loading rates (the strain rate response range of 10 ~ (-5) / sg ~ (-2) / s) have been carried out. The peak stress, peak strain and damage characteristics of concrete are analyzed. The results show that after cyclic loading, with the increase of loading rate, the peak stress of concrete increases, the peak strain increases gradually, and the growth rate of damage variable D slows down. With the increase of confining pressure, the peak stress and strain of concrete gradually increase, and the growth rate of damage variable D decreases, but the difference of damage limit becomes larger and larger. Based on the above experimental results, the empirical formulas of dynamic peak stress and confining pressure, loading rate and dynamic peak strain, confining pressure and loading rate of concrete after cyclic loading are obtained.
【作者單位】： 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;三峽大學(xué)土木與建筑學(xué)院;
【基金】：國(guó)家自然科學(xué)基金資助項(xiàng)目(51279092,51309143) 三峽大學(xué)研究生科研創(chuàng)新基金資助項(xiàng)目(SDYC2016027)
【分類號(hào)】：TV431
本文編號(hào)：2409597
[Abstract]:Water saturated concrete specimens under different confining pressures (0 ~ 2 ~ 5 ~ 5 ~ 10 MPA) were subjected to 25 cycles of cyclic loading (the lower limit of the load was 140 KN, the upper limit of 260 KN, the frequency of 0.1Hz). The static and dynamic triaxial compression tests of concrete under different loading rates (the strain rate response range of 10 ~ (-5) / sg ~ (-2) / s) have been carried out. The peak stress, peak strain and damage characteristics of concrete are analyzed. The results show that after cyclic loading, with the increase of loading rate, the peak stress of concrete increases, the peak strain increases gradually, and the growth rate of damage variable D slows down. With the increase of confining pressure, the peak stress and strain of concrete gradually increase, and the growth rate of damage variable D decreases, but the difference of damage limit becomes larger and larger. Based on the above experimental results, the empirical formulas of dynamic peak stress and confining pressure, loading rate and dynamic peak strain, confining pressure and loading rate of concrete after cyclic loading are obtained.
【作者單位】： 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;三峽大學(xué)土木與建筑學(xué)院;
【基金】：國(guó)家自然科學(xué)基金資助項(xiàng)目(51279092,51309143) 三峽大學(xué)研究生科研創(chuàng)新基金資助項(xiàng)目(SDYC2016027)
【分類號(hào)】：TV431
【相似文獻(xiàn)】
相關(guān)期刊論文 前1條
1 王金峰;于天來(lái);黃美蘭;;河冰單軸無(wú)側(cè)限抗壓強(qiáng)度的試驗(yàn)研究[J];低溫建筑技術(shù);2007年01期
相關(guān)會(huì)議論文 前1條
1 李紅;宮必寧;王偉;;混凝土動(dòng)態(tài)抗剪特性試驗(yàn)研究[A];首屆全國(guó)水工抗震防災(zāi)學(xué)術(shù)會(huì)議論文集[C];2006年
相關(guān)碩士學(xué)位論文 前2條
1 王偉;巖性材料動(dòng)力抗剪特性初探[D];河海大學(xué);2006年
2 張平;非貫通裂隙巖機(jī)低溫動(dòng)力特性研究[D];西安理工大學(xué);2000年
，本文編號(hào)：2409597
本文鏈接：http://sikaile.net/kejilunwen/shuiwenshuili/2409597.html
最近更新
教材專著
