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横向剪力荷载分布系数(“S-over”LDF)在确定桥梁弯矩与剪力分布中已使用多年。直到最近AASHTO LRFD桥梁设计规范修改后,以幂函数形式表示的新的LDF方程得以应用。虽然这些新方程可以更准确地计算弯矩和剪力分布,且与测试和有限元分析结果接近,但它们是基于复杂的回归分析,不能体现LDF的基本背景。因此,为能更好地理解梁体尺寸和间距与LDF之间的关系,工程师需要一个更基本的方程,如横向剪力荷载分布系数方程。该研究的主要目的是开发一个工字形钢梁桥和预应力混凝土梁桥的横向剪力荷载分布系数简化方程。用精细有限元分析(FEA)模型评估和验证7个实际工字梁桥的现场测试结果,以不同梁间距和跨径为变化参数研究验证该方程。结果表明,该方程与基于计算机分析的精确有限元模型结果有很好的相关性。
Transverse shear load distribution factor (“S-over ” LDF) has been used for many years in determining bridge moment and shear distribution. Until recently, the AASHTO LRFD Bridge Design Specification was modified and new LDF equations expressed as power functions were applied. Although these new equations can more accurately calculate the bending moment and shear distribution and are close to those of the test and finite element analysis, they are based on complex regression analysis and do not reflect the basic background of LDF. Therefore, to better understand the relationship between beam size and spacing and LDF, engineers need a more fundamental equation, such as the coefficient of transverse shear load distribution coefficient. The main purpose of this study was to develop a simplified equation for the distribution coefficient of transverse shear load distribution of a steel shaped girder bridge and prestressed concrete girder bridge. The finite element analysis (FEA) model was used to evaluate and verify the field test results of seven actual I-beam bridges. The equations were validated by varying the beam spacings and span diameters. The results show that this equation has a good correlation with the results of an accurate finite element model based on computer analysis.