【摘要】：為了研究鋼筋混凝土長柱在快速軸心受壓加載下應(yīng)變率和慣性效應(yīng)對其性能的影響,開展了鋼筋混凝土長柱快速軸心受壓加載試驗(yàn)和動力有限元模擬研究。設(shè)計(jì)了兩組共6根構(gòu)件,長細(xì)比分別為12和22,快速加載試驗(yàn)中實(shí)測混凝土材料應(yīng)變率達(dá)到10-3/s數(shù)量級。試驗(yàn)結(jié)果表明,與準(zhǔn)靜載相比,快速軸心受壓下構(gòu)件承載力及對應(yīng)的軸向變形均有不同程度的提高,并且動力增大系數(shù)隨長細(xì)比增大而增大。將CEB-FIB模式規(guī)范的混凝土材料動態(tài)應(yīng)力-應(yīng)變關(guān)系引入混凝土塑性損傷模型,在ABAQUS中建立了鋼筋混凝土長柱快速軸心受壓下力學(xué)性能分析的顯式動力有限元模型,數(shù)值模擬結(jié)果與試驗(yàn)結(jié)果吻合良好。最后,運(yùn)用所建立的有限元模型分析快速加載下構(gòu)件承載力動力效應(yīng)的形成機(jī)制。分析結(jié)果表明,構(gòu)件長細(xì)比較小時其慣性效應(yīng)可以忽略,動力增大系數(shù)可以主要由應(yīng)變率效應(yīng)來描述,隨長細(xì)比增大,慣性效應(yīng)對動力增大系數(shù)的貢獻(xiàn)越來越明顯,而應(yīng)變率效應(yīng)仍不可忽略。
[Abstract]:In order to study the effect of strain rate and inertia effect on the performance of long reinforced concrete columns under rapid axial compression, the rapid axial loading test and dynamic finite element simulation of long reinforced concrete columns were carried out. Two groups of six members with the slenderness ratio of 12 and 22 were designed. The strain rate of concrete materials measured in the rapid loading test reached the order of 10? 3? s. The experimental results show that compared with the quasi-static load, the bearing capacity and the corresponding axial deformation of the members under rapid axial compression are improved to some extent, and the dynamic increase coefficient increases with the increase of the slenderness ratio. The dynamic stress-strain relationship of concrete in CEB-FIB model is introduced into the plastic damage model of concrete. An explicit dynamic finite element model for the analysis of mechanical properties of long reinforced concrete columns under rapid axial compression is established in ABAQUS. The numerical simulation results are in good agreement with the experimental results. Finally, the finite element model is used to analyze the forming mechanism of the dynamic effect of the bearing capacity of the member under rapid loading. The results show that the inertia effect can be ignored and the dynamic increase coefficient can be described mainly by strain rate effect. With the increase of the slenderness ratio, the contribution of inertia effect to the dynamic increase coefficient becomes more and more obvious. The strain rate effect can not be ignored.
【作者單位】： 湖南大學(xué)土木工程學(xué)院;教育部建筑安全與節(jié)能重點(diǎn)實(shí)驗(yàn)室(湖南大學(xué));
【基金】：國家自然科學(xué)基金重大研究計(jì)劃重點(diǎn)項(xiàng)目(90715033);國家自然科學(xué)基金重大研究計(jì)劃培育項(xiàng)目(91015007)
【分類號】：TU375.3

【相似文獻(xiàn)】

相關(guān)期刊論文 前10條

1 吳至賢,胡慶恩,程大正,汪敏勇;無牛腿長柱裝配整體多層框架結(jié)構(gòu)的設(shè)計(jì)研究與試點(diǎn)工程[J];建筑結(jié)構(gòu)學(xué)報(bào);1981年05期

2 婁彥剛;勁性混凝土長柱簡化計(jì)算法[J];工業(yè)建筑;1996年03期

3 蔡紹懷,顧萬黎;鋼管混凝土長柱的性能和強(qiáng)度計(jì)算[J];建筑結(jié)構(gòu)學(xué)報(bào);1985年01期

4 謝懷欣,莊崖屏,曹平周;高強(qiáng)砼偏心受壓長柱的受力性能[J];煙臺大學(xué)學(xué)報(bào)(自然科學(xué)與工程版);1993年04期

5 薛剛,李斌,劉海生;鋼骨混凝土長柱穩(wěn)定承載力研究試驗(yàn)設(shè)計(jì)[J];包頭鋼鐵學(xué)院學(xué)報(bào);2004年04期

6 李志淵;陳全紅;;鋼筋砼長柱偏心距增大系數(shù)計(jì)算方法比較[J];蘭州交通大學(xué)學(xué)報(bào);2007年04期

7 譚克鋒;;鋼管高強(qiáng)混凝土柱的力學(xué)性能 Ⅱ.長柱和偏壓柱的力學(xué)性能(英文)[J];西南科技大學(xué)學(xué)報(bào);2005年04期

8 趙文艷;軸心受壓長柱設(shè)計(jì)方法[J];油氣田地面工程;2003年07期

9 劉杰;劉慶洋;安琳;;GFRP混凝土圓形管柱試驗(yàn)研究[J];長春工程學(xué)院學(xué)報(bào)(自然科學(xué)版);2007年01期

10 陳勇,張耀春,王W，

本文編號：2445140