考虑施工过程任意截面偏压构件收缩徐变分析

Analysis of Shrinkage Creep of Arbitrary Cross-Section Eccentrically-Compressed Members Considering Construction Process

将施工过程引入任意截面偏心受压构件收缩徐变的计算分析 ,考虑偏心受压构件轴力变化、混凝土弹性模量变化、环境的变化及配筋率对截面内力重分布的影响 ,利用混凝土徐变中值系数和混凝土弹性模量中值系数 ,推导出了任意截面偏心受压构件收缩徐变的计算公式 ,最后对一实际工程进行了施工过程混凝土收缩徐变跟踪测试 .结果表明 ,考虑施工过程与不考虑施工过程的计算结果有较大的差别 ,所提出的计算公式与实测结果较相符 ,符合实际受力模型 ,可供工程设计参考 .

The formulas to calculate the shrinkage creep of arbitrary cross-section eccent rically-compressed members were deduced in this paper, during which, besides th e process of construction, the influences of the axial force variation, the conc rete elasticity modulus variation and the change of circumstance and the reinfor cement ratio on the stress redistribution in the cross-section were considered, and the median coefficients of concrete creep and concrete elastic modulus were employed. The track test of the shrinkage creep in an actual project was then c arried out. The results indicate that there is great difference between the calc ulated results with and without considering the construction process, that the t heoretically calculated results accord well with the practical ones, and that th e proposed calculation formulas are in good agreement with the practical bearing model, thus providing references to the design of actual projects.