- 摘 要
-
（1 同濟(jì)大學(xué)土木工程學(xué)院建筑工程系， 上海 200092; 2 國網(wǎng)四川省電力公司經(jīng)濟(jì)技術(shù)研究院， 成都 610041）
［摘要］對不同寬高比混凝土基礎(chǔ)進(jìn)行上拔試驗(yàn)，并運(yùn)用有限元軟件ABAQUS對不同寬高比混凝土獨(dú)立擴(kuò)展基礎(chǔ)進(jìn)行上拔數(shù)值模擬，通過將有限元分析結(jié)果與試驗(yàn)結(jié)果進(jìn)行對比，驗(yàn)證了有限元方法的有效性。采用建立的數(shù)值模型進(jìn)一步進(jìn)行有限元分析，研究了寬高比、斜邊坡度等因素對混凝土擴(kuò)展基礎(chǔ)截面承載性能的影響。在此基礎(chǔ)上，基于有效寬度的概念，引入有效寬度修正系數(shù)k、坡度修正系數(shù)j來考慮寬高比與斜邊坡度對等效內(nèi)力臂系數(shù)的影響，并提出適用于基礎(chǔ)抗拔計(jì)算的截面上部配筋計(jì)算公式。結(jié)果表明，基于有限元得出的修正系數(shù)與建議修正系數(shù)吻合度較高，誤差在1%～3-4%之間，從而證明了提出的建議修正方法的合理性。
［關(guān)鍵詞］大寬高比； 斜邊坡度； 混凝土獨(dú)立擴(kuò)展基礎(chǔ)； 有限元分析； 抗拔設(shè)計(jì)方法
中圖分類號：TU470+.3文獻(xiàn)標(biāo)識碼：A文章編號：1002-848X(2018)15-0098-07
Study on design method for uplift capacity of concrete isolated spread foundation with large width-to-height ratio
Li Yuanqi1, Qin Xiaoliang1, Luo Jinhui1, Wang Wenguang2, Luo Le2
(1 Department of Structural Engineering, College of Civil Engineering, Tongji University, Shanghai 200092, China; 2 State Grid Sichuan Economic Research Institute, Chengdu 610041, China)
Abstract:Concrete foundations with different width-to-height ratio were tested under the uplift load and the finite element software ABAQUS was applied to numerical simulation of concrete isolated spread foundations with large width-to-height ratio under uplift load. The results of finite element analysis were compared with experimental results, which verified the validity of the finite element analysis method. Then, several finite element models were built to further study the effect of factors, such as width-to-height ratio and hypotenuse slope, on the bearing capacity of concrete isolated spread foundations. On this basis, the effective width correction coefficient k and slope correction coefficient j were introduced to consider the effect of width-to-height ratio and hypotenuse slope on the equivalent coefficient of the arm of internal force in cross section based on the concept of effective width. In addition, a suggested formula for the reinforcement calculation which is suitable to the uplift calculation was proposed. It was shown that the correction coefficient based on the finite element agreed well with the recommended correction coefficient, and the error range was between 1% and 3-4%, which proves that the recommended correction method proposed is reasonable.
Keywords:large width-to-height ratio; hypotenuse slope; concrete isolated spread foundation; finite element analysis; design method for uplift capacity
*國家電網(wǎng)科技項(xiàng)目（52199915002M）。
作者簡介：李元齊，博士，教授，博士生導(dǎo)師，Email:liyq@#edu.cn。
- 下載地址
-
