| 摘要: |
| 长期荷载作用下，钢-混凝土组合梁会因混凝土的收缩而产生附加变形，我国现行规范均未详细考虑这一附加变形对组合梁长期变形的影响。分析研究了国内外文献中有关混凝土收缩的计算理论，基于澳洲规范(AS3600-1988)建立了考虑混凝土收缩应变的组合梁附加挠度计算式，对实际工程中的2根典型组合梁进行了实际收缩效应的计算，利用有限差分模拟分析软件FLAC 3D对组合梁在收缩效应下的变形进行了模拟计算，并对各项计算结果进行了分析比较。计算结果、FLAC 3D数值模拟结果及实测数据的对比分析表明，该计算式的计算值与模拟值和实测值最为接近，可用于组合梁长期附加挠度的计算分析。 |
| 关键词: 简支组合梁 长期变形 混凝土收缩模式 |
| DOI： |
| 分类号:TU528.01 |
| 基金项目:山西省自然科学基金资助项目（No.2013011027-2） |
|
| Numerical simulation of concrete shrinkage mode of simple composite beams acted by long-term deformation |
|
LI Da1,2, MOU Zai-gen1
|
|
1.Civil and Environmental Engineering School， University of Science and Technology Beijing;2.Institute of Yangquan， Taiyuan University of Technology
|
| Abstract: |
| By the action of long term loads， the steel-concrete composite beams will undergo additional deformation due to concrete shrinkage. The existing Chinese specifications do not consider in detail the impacts given by this additional deflection on long-term deformation of the composite beams. This paper analyzes and studies the computation theory with regards to concrete shrinkage in the domestic and foreign literatures， tables the composite beams′ additional deflection calculation formula reflecting the concrete shrinkage and strain， calculates the actual shrinkage effects of two typical composite beams of an actual engineering project， performs the simulated deformation calculation of the composite beams under the shrinkage effects by the finite difference simulation software FLAC 3D，and compares the various calculation results. Calculation， FLAC 3D numerical simulation as well as the comparative analysis results of the actually measured data show that the shrinkage calculation method based upon Australian Standard (AS3600-1988) of this formula approximates most of the simulated values and measured values， and can be used for long term additional deflection calculation analysis of the composite beams. |
| Key words: simply supported composite beams long term deformation concrete shrinkage mode |
