几种实体桥梁的光弹实验分析与结构评价

为探询桥梁整体结构特点,按照实验力学的相似理论,采用数控加工方法将六种典型实体结构的桥梁制成光弹性模拟试件。通过光弹性实验分析获取它们承载状况下的等色线和等倾线图,经计算机数据采集和处理后,得到模型结构的二维应力分布趋势以及应力沿桥面的变化规律。根据系统工程理论,对它们整体结构进行评价并提出局部改进建议。实验证明光弹法对桥梁结构及复杂弹性几何体承载规律的研究非常有效,是研究这一类问题的一种很好的实验仿真方法。结合理论计算和专家分析系统可以综合的进行桥梁结构方案的优选设计,为理论计算的准确合理性提供实验依据。该实验研究结果可以作为桥梁结构教学素材,为实际建桥方案的拟定提供参照。

Analysis of Dispersion Photoelastic Experiment and Structure Estimation for Several Entity Bridges

For seeking for rational structure form of bridges,according to the similarity theory,with machining numerical controlled means,experiments of six bridge models were carried out and their color line charts were obtained.Their isochromatic pattern and isoclinic pattern were obtained through analysis of dispersion experiments under load-bearing.The planar stress distributions and the stress change trend on the sections of the six bridge models were obtained with the date received and processed by computer.Bases on the theory of the system engineering the suggestions of improving some parts are proposed.The results show that the dispersion experiment takes a great effect in research of bridges and of load-bearing bodies with complex geometry.It is also a method of experimental simulation for this kind of problems.The results can be used as a source material of bridge teaching or the experiment basis for engineering projects.Dispersion simulation experiment offers a way to design and research the structures of bridges.