交通运输工程学报
交通運輸工程學報
교통운수공정학보
JOURNAL OF TRIFFIC AND TRANSPORTATION ENGINEERING
2015年
2期
22-31
,共10页
桥梁工程%素混凝土柱%极限承载力%长细比%偏心率
橋樑工程%素混凝土柱%極限承載力%長細比%偏心率
교량공정%소혼응토주%겁한승재력%장세비%편심솔
bridge engineering%plain concrete column%ultimate bearing capacity%slenderness%eccentricity
开展了19根素混凝土柱极限承载力试验，提出了素混凝土柱长细比和偏心率的合理取值范围，采用非线性有限元方法对试验柱承载力进行计算，通过理论分析和试验数据回归，提出了素混凝土柱极限承载力计算方法。计算结果表明：当试验柱长细比大于15与偏心率为0．3时，素混凝土柱的破坏模式为截面受拉破坏，未能充分发挥混凝土以受压为主的材料性能；当试验柱长细比不大于15与偏心率不大于0．3时，其破坏模式为截面受压破坏。承载力有限元算法计算值与试验值的平均比值为0．995，方差为0．0018，计算值与试验值吻合较好，有限元算法可用于素混凝土柱的参数分析。提出的素混凝土柱极限承载力计算方法考虑了长细比和偏心率对承载力影响的耦合作用，其计算值与有限元算法计算值的平均比值为0．976，方差为0．003，表明提出的算法具有较高的精度，且偏安全。
開展瞭19根素混凝土柱極限承載力試驗，提齣瞭素混凝土柱長細比和偏心率的閤理取值範圍，採用非線性有限元方法對試驗柱承載力進行計算，通過理論分析和試驗數據迴歸，提齣瞭素混凝土柱極限承載力計算方法。計算結果錶明：噹試驗柱長細比大于15與偏心率為0．3時，素混凝土柱的破壞模式為截麵受拉破壞，未能充分髮揮混凝土以受壓為主的材料性能；噹試驗柱長細比不大于15與偏心率不大于0．3時，其破壞模式為截麵受壓破壞。承載力有限元算法計算值與試驗值的平均比值為0．995，方差為0．0018，計算值與試驗值吻閤較好，有限元算法可用于素混凝土柱的參數分析。提齣的素混凝土柱極限承載力計算方法攷慮瞭長細比和偏心率對承載力影響的耦閤作用，其計算值與有限元算法計算值的平均比值為0．976，方差為0．003，錶明提齣的算法具有較高的精度，且偏安全。
개전료19근소혼응토주겁한승재력시험，제출료소혼응토주장세비화편심솔적합리취치범위，채용비선성유한원방법대시험주승재력진행계산，통과이론분석화시험수거회귀，제출료소혼응토주겁한승재력계산방법。계산결과표명：당시험주장세비대우15여편심솔위0．3시，소혼응토주적파배모식위절면수랍파배，미능충분발휘혼응토이수압위주적재료성능；당시험주장세비불대우15여편심솔불대우0．3시，기파배모식위절면수압파배。승재력유한원산법계산치여시험치적평균비치위0．995，방차위0．0018，계산치여시험치문합교호，유한원산법가용우소혼응토주적삼수분석。제출적소혼응토주겁한승재력계산방법고필료장세비화편심솔대승재력영향적우합작용，기계산치여유한원산법계산치적평균비치위0．976，방차위0．003，표명제출적산법구유교고적정도，차편안전。
The tests of ultimate bearing capacity for 19 plain concrete columns were carried out. The reasonable scopes of slenderness and eccentricity of plain concrete columns were proposed. The bearing capacities of test columns were calculated by nonlinear finite element method.A calculation method of ultimate bearing capacity for plain concrete column was presented by theoretical analysis and regression of test data. Calculation result shows that when the slendernesses of test columns are higher than 15 and the eccentricities are 0.3,their failure modes are section tensile failure,which can not play full material performance of compression.When the slendernesses are not higher than 15 and the eccentricities are not higher than 0.3,their failure modes are section compression failure.The mean ratio of calculated values by the finite element method to test values is 0.995,the variance is 0.001 8,so the calculated value fits well with test value,and the finite element method can be used for the parameter analysis of plain concrete column.Based on considering the coupling influence of slenderness and eccentricity on bearing capacity,in the proposed calculation method of ultimate bearing capacity,the mean ratio of calculated values by the proposed method and the finite element method is 0.976,the variance is 0.003,which indicates that the proposed method has high precision and high safety.2 tabs, 17 figs,20 refs.
