[1]鲁正刚,王修信.桩支承混凝土底板约束收缩裂缝计算模型[J].东南大学学报(自然科学版),2016,46(2):386-391.[doi:10.3969/j.issn.1001-0505.2016.02.025]
 Lu Zhenggang,Wang Xiuxin.Calculation model for restrained shrinkage crack of pile-supported concrete foundation slabs[J].Journal of Southeast University (Natural Science Edition),2016,46(2):386-391.[doi:10.3969/j.issn.1001-0505.2016.02.025]
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桩支承混凝土底板约束收缩裂缝计算模型()
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《东南大学学报(自然科学版)》[ISSN:1001-0505/CN:32-1178/N]

卷:
46
期数:
2016年第2期
页码:
386-391
栏目:
土木工程
出版日期:
2016-03-20

文章信息/Info

Title:
Calculation model for restrained shrinkage crack of pile-supported concrete foundation slabs
作者:
鲁正刚王修信
东南大学土木工程学院, 南京 210096
Author(s):
Lu Zhenggang Wang Xiuxin
School of Civil Engineering, Southeast University, Nanjing 210096, China
关键词:
桩支承混凝土底板 直接刚度法 约束应力 收缩裂缝 防裂措施
Keywords:
pile-supported concrete foundation slabs direct stiffness method restraint stress shrinkage crack crack prevention measures
分类号:
TU375.2
DOI:
10.3969/j.issn.1001-0505.2016.02.025
摘要:
为了对承受内外部约束作用的桩支承混凝土底板约束应力分布和开裂危险区域进行预测,采用直接刚度法建立了桩支承混凝土底板约束收缩裂缝计算模型,并编制了相应的计算程序.通过算例验证了计算模型中若干参数取值的合理性,并对参数进行敏感性分析.结果表明,混凝土底板约束收缩应力与地基土的弹性模量和不排水抗剪强度、混凝土收缩应变以及底板配筋率成正比,与板的有效宽度成反比.其中,混凝土收缩应变、底板配筋率和地基土弹性模量的影响较大,并据此提出了相应的防裂措施.
Abstract:
In order to predict the restraint stress distribution and the dangerous zones of cracking caused by interior and exterior restraints,the calculation model for restrained shrinkage cracks of pile-supported concrete foundation slabs was established based on the direct stiffness method and the corresponding calculation procedure was compiled. Then, the rationality of parameter values in this model was verified by a numerical example. The parameter sensitivity was analyzed. The results show that the restraint shrinkage stresses are in proportion to the elasticity modulus and the undrained shear strength of the subsoil,the shrinkage strain of concrete and the reinforcement ratio of foundation slabs,while in inversely proportional to the effective width of the slabs. The restraint shrinkage stresses are more significantly affected by the shrinkage strain of concrete,the reinforcement ratio of foundation slabs and the elasticity modulus of the subsoil. Accordingly,some workable crack prevention measures are proposed.

参考文献/References:

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备注/Memo

备注/Memo:
收稿日期: 2015-08-30.
作者简介: 鲁正刚(1986—),男,博士生;王修信(联系人),男,博士,教授,博士生导师,gsdean2@seu.edu.cn.
基金项目: 国家自然科学基金资助项目(51378105).
引用本文: 鲁正刚,王修信.桩支承混凝土底板约束收缩裂缝计算模型[J].东南大学学报(自然科学版),2016,46(2):386-391. DOI:10.3969/j.issn.1001-0505.2016.02.025.
更新日期/Last Update: 2016-03-20