单箱双室箱梁有效翼缘宽度的取值研究

发布时间：2018-03-26 19:05

本文选题：单箱双室箱梁　切入点：有效翼缘宽度　出处：《铁道建筑》2017年04期

【摘要】：为了确定单箱双室箱梁有效翼缘宽度的取值,分别按照中国现有规范中对单箱单室箱梁以及美国AASHTO规范中对单箱多室箱梁有效翼缘宽度取值的规定,对箱梁的刚度进行折减并建立梁格模型。为了对比刚度折减精度,采用有机玻璃模型进行实测研究,建立基于实体单元的有限元数值模型。通过对比不同模型在集中荷载作用下的竖向变形和纵向应力可知,按中国规范刚度折减后的挠度值与试验值相对误差为-4.4%,按美国规范则为4.8%,按中国规范刚度折减后的梁格峰值应力与实体单元数值模拟值的相对误差为-25.0%,计算结果偏小;按美国规范则为-7.2%,在10%以内。当计算单箱双室箱梁的应力时,建议按美国AASHTO规范进行刚度折减。
[Abstract]:In order to determine the effective flange width of single box girder and double chamber box girder, the effective flange width of single box girder and multi-chamber box girder is determined according to the current code of China and the AASHTO code of the United States of America, respectively. The stiffness of box girder is reduced and the girder lattice model is established. In order to compare the precision of stiffness reduction, the PMMA model is used to carry out the experimental study. The finite element numerical model based on solid element is established. The vertical deformation and longitudinal stress of different models under concentrated load are compared. The relative error between the deflection value and the test value after the reduction of the stiffness according to the Chinese code is -4.4, and the relative error between the peak stress of the beam lattice after the reduction of the stiffness of the Chinese code and the numerical simulation value of the solid element is -25.0, and the calculation result is small. When the stress of single box and double chamber girder is calculated, it is suggested that the stiffness reduction should be carried out according to the AASHTO code of the United States.
【作者单位】：兰州交通大学甘肃省道路桥梁与地下工程重点实验室;
【基金】：国家自然科学基金(51368031) 甘肃省基础研究创新群体项目资助(1506RJIA029) 兰州交通大学优秀平台资助(201601)
【分类号】：U448.213

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