Analysis of the Aashto Lrfd Horizontal Shear Strength Equation
Analysis of the Aashto Lrfd Horizontal Shear Strength Equation
复制标题
Aashto Lrfd 水平剪切强度方程的分析
DOI：
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发表时间：
2011
期刊：
影响因子：
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通讯作者：
M. Lang
中科院分区：
文献类型：
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作者：
M. Lang
桥面和主梁的共同作用对上部结构的优化是至关重要的。甲板上的力传递到梁是通过两个元素之间的剪切界面完成的。传递是通过界面处混凝土的凝聚力，然后通过界面上的剪切钢筋发生的。足够的抗剪强度对上部结构的成功至关重要。537个水平剪切试验的集合组成了研究各种混凝土类型和界面表面处理的数据库。根据AASHTO LFRD桥梁设计规范计算的水平抗剪强度预测值与实测抗剪强度进行了比较。计算每个样本的专业偏差。计算每个类别的专业偏差、标准差和变异系数。研究了材料性能因素和加工因素。研究并计算了载荷系数，用于可靠性指标的计算。最后一步是计算每个类别的可靠性指数。这个过程被重复以学习由Wallenfelsz提出的方程的可靠性。结果表明：AASHTO LRFD水平抗剪强度方程的可靠度指标远低于3.5的期望目标可靠度指标；Wallenfelsz方程的可靠度指标较高，但仍不接近目标可靠度指标。
The composite action of a bridge deck and girder is essential to the optimization of the superstructure. The transfer of forces in the deck to the girders is done across a shear interface between the two elements. The transfer occurs through the cohesion of the concrete at the interface and then through the shear reinforcement across the interface. Adequate shear strength is essential to the success of the superstructure. A collection of 537 horizontal shear tests comprised the database for the study of various concrete types and interface surface treatments. The predicted horizontal shear strength calculated from the AASHTO LFRD bridge design code was compared to the measured shear strength. The professional bias was computed for each specimen. The professional biases, standard deviations, and coefficients of variation for each category were calculated. The material properties factor along with fabrication factor was researched. The loading factors were researched and calculated for use in calculating the reliability index. The final step was to compute the reliability index for each category. The process was repeated to learn the reliability of the equation proposed by Wallenfelsz. The results showed that the reliability index for the AASHTO LRFD horizontal shear strength equation wash much lower than the desired target reliability index of 3.5. The reliability index for the Wallenfelsz equation was higher but still not close to the target reliability index.