- 摘 要
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張光瑋1 張勛斌2 邵 軍1 黃宗明1
(1 重慶大學土木工程學院，重慶 400045； 2 重慶市江北城開發(fā)投資有限公司，重慶 400020)[摘要] 通過對8根長細比為20~25的鋼筋混凝土細長柱極限承載能力試驗，研究了在大長細比區(qū)域柱子的長細比、配筋率、混凝土強度等對鋼筋混凝土細長柱的極限承載能力及破壞形態(tài)的影響。試驗結果表明，在大長細比區(qū)域，長細比的增加對構件的極限承載力降低效應更加顯著；當長細比達到25后，宜采用模型柱法進行設計，偏心距增大系數(shù)法設計所增加的縱筋配筋率對提高構件極限承載力的作用不大：但混凝土的強度等級仍然對試件的承載力及破壞形態(tài)有較大影響，當混凝土強度接近或大于C60時，即使是長細比為25的構件也可能發(fā)生失穩(wěn)破壞。
[關鍵詞] 鋼筋混凝土細長柱；大長細比；極限承載力Experiment study on bearing capacity of reinforced concrete slender columns
Zhang Guangwei1, Zhang Xunbin2, Shao Jun1, Huang Zongming1
(1 College of Civil Engineering, Chongqing University, Chongqing 400045, China; 2 Chongqing Jiangbeicheng Investment Development Co., Ltd., Chongqing 400020, China)Abstract: The eight reinforced concrete slender columns with the slenderness ratio from 20 t0 25 are investigated on the effect of the slendeness, the reinforcement ratio, the concrete strength on the ultimate bearing capacity and the failure mode of reinforced concrete slender columns. The results show that the more slenderness of the columns, the heavier effects on the ultimate loads reduction. When the slenderness ratio of the columns is 25 0r more, the model column method is better to calculate the longitudinal reinforcement than the eccentricity accreting factor method, and the later metbod will require more reinforcement which is seldemly useful to increase ultimate bearing capacity of the columns. However, the concrete strength has evident effects on the ultimate bearing capacity and the failure mode of the colums. When the concrete strength is close to or more than C60, the instability failure mode of the columns, even if the slenderness ratio is 25, may be occured.
Keywords: reinforced concrete slender columns; highier slenderness; ultimate bearing capacity
