本文選題：樁基礎 + 水平載荷試驗��； 參考：《巖石力學與工程學報》2015年S2期

【摘要】：通過室內(nèi)模型對比模型試驗,對閉口的階梯型預制管樁和閉口等截面預制管樁進行水平載荷模型試驗研究,從荷載 位移曲線、臨界水平荷載以及樁身彎矩分布等方面對階梯型管樁的水平承載性狀展開定性的研究。結(jié)果表明:階梯型管樁水平荷載 位移曲線同等截面管樁一樣均為緩變型,且階梯型管樁水平承載力大于平均直徑相等的等截面管樁,其提高程度與管樁平均直徑大小存在著密切的關系。階梯型管樁單位體積臨界水平荷載較等截面管樁有不同程度的提高,變截面比越大,單位體積臨界水平荷載大小也越大,材料利用率越高。階梯型管樁改變了等截面管樁單個彎矩極值的情況,在大小管節(jié)上都出現(xiàn)彎矩極大值,并隨階梯型管樁變截面比的提高,大小管節(jié)上的彎矩極大值比值有不同程度的下降。與平均直徑相等的等截面管樁相比,階梯型管樁小管節(jié)上的彎矩大小得到了較大程度的提高,使下部樁身受力更合理,材料利用率更高。
[Abstract]:In this paper, the horizontal load model test is carried out on the closed step prefabricated pipe pile and the closed section prefabricated pipe pile through the model test of indoor model, and the displacement curve is obtained from the load and displacement curve. The critical horizontal load and the bending moment distribution of the pile body are studied qualitatively on the horizontal bearing behavior of the stepped pipe pile. The results show that the horizontal load and displacement curves of stepped pipe piles are all of the same slowly modified type, and the horizontal bearing capacity of the stepped pipe piles is larger than that of the same section pipe piles with equal average diameter. The degree of improvement is closely related to the average diameter of pipe pile. The critical horizontal load per unit volume of stepped pipe pile is higher than that of equal section pipe pile. The bigger the ratio of variable section is, the larger the critical horizontal load per unit volume is, and the higher the material utilization ratio is. Step type pipe pile changes the case of single moment extremum of the same section pipe pile, and the moment maximum value appears on the big and small pipe joints, and with the increase of the ratio of the variable section of the step type pipe pile, the maximum value ratio of the bending moment on the big and small pipe joint decreases to some extent. Compared with the uniform section pipe pile with equal average diameter, the bending moment on the small pipe joint of the stepped pipe pile is greatly improved, which makes the lower pile body more reasonable and the material utilization ratio higher.
【作者單位】： 湖南工業(yè)大學土木工程學院;
【基金】：國家自然科學基金資助項目(51208194)
【分類號】：TU473.1

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相關期刊論文 前5條

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本文編號：1816216