Fatigue Analysis and Design of Steel Orthotropic Deck for Bronx-Whitestone Bridge, New York City
Fatigue Analysis and Design of Steel Orthotropic Deck for Bronx-Whitestone Bridge, New York City
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DOI：
10.3141/1892-08
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发表时间：
2004
影响因子：
1.7
通讯作者：
G. Fanjiang;Q. Ye;O. Fernández;L. R. Taylor
中科院分区：
文献类型：
--
作者：
G. Fanjiang;Q. Ye;O. Fernández;L. R. Taylor
介绍了为评估纽约市布朗克斯-白石大桥计划更换的正交异性钢桥面板的结构性能而进行的参数研究。一个主要目标是分析应力范围的桥面细节，表明疲劳裂纹的敏感性。根据分析结果，对初步甲板设计进行了重要修改。这些变化主要是为了减少横隔板和横隔板切口周围肋的最大应力，这些位置传统上容易开裂，如在其他桥梁的正交异性桥面上观察到的那样。甲板设计完成后，制造了一个48 × 37英尺的全尺寸原型甲板，并进行了一系列实验室控制的疲劳试验。创建了适当的边界条件和加载程序，以产生与全桥模型相似的应力范围。实验室试验结果与计算的应力范围相关性良好，表明桥面板具有出色的抗疲劳性能，可以很容易地提供正交各向异性桥面板规定的75年设计使用寿命。
A description is given of the parametric study done to evaluate the structural behavior of the replacement steel orthotropic deck planned for the Bronx—Whitestone Bridge in New York City. A principal objective was to analyze the deck details for stress ranges that indicated sensitivity to fatigue cracking. On the basis of the analysis findings, important modifications were made to the preliminary deck design. These changes were primarily to reduce the maximum stresses in the diaphragms and ribs around the diaphragm cutouts—locations that traditionally have been prone to cracking, as observed on orthotropic decks on other bridges. After the completion of the deck design, a full-scale prototype deck measuring 48 by 37 ft was fabricated and subjected to a series of laboratorycontrolled fatigue tests. Proper boundary conditions and loading procedures were created to produce stress ranges similar to those in the full bridge model. Laboratory test results correlated well with the computed stress ranges and demonstrated that the deck had outstanding fatigue resistance and could readily provide the 75-year design service life specified for the orthotropic deck.