基于不同混凝土徐变模式的简支组合梁附加挠度分析

Additional Deflection Analysis of Simply Supported Composite Beams Based on Different Concrete Creep Modes

翼缘混凝土的徐变会影响型钢-混凝土组合梁的长期变形。本文建立基于混凝土徐变系数的组合梁长期附加挠度的计算公式,分析研究国内外文献中有关混凝土徐变的计算理论,基于常用的混凝土徐变系数计算模式对实际工程中的2根型钢-混凝土简支组合梁进行徐变效应计算,利用数值模拟分析软件FLAC3D对该组合梁的徐变附加挠度进行模拟计算。经过对计算、实测及模拟结果的分析比较,结果表明,在选择了适宜的徐变模式和对应的计算公式后,可采用本文的研究方法对简支组合梁的徐变附加挠度进行计算和预测。

Creep of the flange concrete will produce impacts on the long-term deformation of profile steel-concrete composite beams. The calculation formula of the composite beam long-term additional deflection is suggested based on the concrete creep coefficient,the calculation theories with regards to concrete creep in the domestic and foreign literatures are analyzed,the creep effects of two profile steel-simple concrete beams in an actual engineering based on the common concrete creep coefficient calculation mode are calculate,and the simulation calculation for the additional creep deflection of the composite beam is conducted with the numerical simulation and analysis software FLAC3D. The comparative analysis of the calculations,measured results and simulation results show that the research can be used to calculate and forecast the additional creep deflection of simple composite beams,after the appropriate creep mode and corresponding calculation is adopted.