Fatigue Design of Modular Bridge Expansion Joints
Fatigue Design of Modular Bridge Expansion Joints
复制标题
模块化桥梁伸缩缝的疲劳设计
DOI：
10.3141/1688-14
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发表时间：
1998
影响因子：
1.7
通讯作者：
R. Dexter
中科院分区：
文献类型：
--
作者：
R. Connor;R. Dexter
最近进行了试验和分析研究，以制定基于性能的规范和模块化桥梁伸缩缝(MBEJ)疲劳设计的评论。讨论了由此提出的疲劳设计和试验规范。这些规范旨在整合到目前的AASHTO荷载和阻力系数设计(LRFD)桥梁设计规范中。为了与桥梁设计规范保持一致，拟议的MBEJ疲劳设计规范使用了与现行AASHTO桥梁规范相同的疲劳设计卡车。然而，AASHTO对MBEJ卡车装载的一项重要修改是明确承认HS系列卡车的后桥实际上代表串联桥。建议采用一种简化的方法来估算分布系数(即分配给单个“中心梁”的设计轮载范围的分数)。讨论了垂直方向和水平方向上的动力影响。并介绍了MBEJ的结构分析指南、良好的细部设计实践以及疲劳抗力和试验。根据建议的规范设计的MBEJ应具有抗疲劳开裂性能。额外的材料和改进的细节将需要符合拟议的规范，预计不会大幅增加MBEJ的初始初始成本。
Experimental and analytical research was recently performed to develop performance-based specifications and commentary for the fatigue design of modular bridge expansion joints (MBEJ). The resulting proposed fatigue-design and test specifications resulting from this research are discussed. These specifications are intended for integration into the present AASHTO Load and Resistance Factor Design (LRFD) Bridge Design Specifications. For consistency with the bridge design specifications, the proposed MBEJ fatigue-design specifications used the same fatigue-design truck as was used by the present AASHTO bridge specifications. However, one important modification of the AASHTO truck loading for MBEJ is the explicit recognition that the rear axles of the HS series trucks actually represent tandem axles. A simplified method to estimate the distribution factor (i.e., the fraction of the range of the design-wheel load assigned to a single “centerbeam”) is recommended. Dynamic impact on both the vertical and horizontal direction is discussed. Also, guidance on structural analysis of MBEJ, good detailing practice, and fatigue resistance and testing are presented. MBEJ designed under the proposed specifications should be resistant to fatigue cracking. The additional material and the improved details, which will be required to comply with the proposed specifications, are not expected to increase the initial first cost of MBEJ substantially.