Analysis and Control of Highway Bridges for Life Extension

该奖项侧重于短跨度公路桥梁的动力学、控制和可靠性，其中许多桥梁由于重型卡车交通引起的负荷而经历了预期使用寿命的急剧下降。其中一些桥梁的使用寿命即将结束，除非找到其他更便宜的方法来减少交通负荷带来的压力和紧张，否则将需要大规模的重建或更换。该项目研究了这一问题的几个方面，包括开发高分辨率控制导向模型，该模型考虑了车辆-结构动态相互作用、桥梁和道路状况以及交通强度等重要影响，以及识别和评估主要通过调整单个车辆悬架和桥梁参数来工作的候选智能响应减少方案。这个问题包含了许多组成部分，特别是与规模和结构问题以及计算和数据之间的相互作用有关的问题。在前者中，在高度可变的交通条件下，潜在的许多车辆与桥梁的动态相互作用，在进入桥梁之前甚至在桥梁上同时具有单个车辆悬架的适应性，代表了空间和时间上多尺度的极端情况。当然，后者在很大程度上取决于遥感、通信、适应性和评估，所有这些都是实时的，并且对计算/数据接口构成了真正的挑战。＊＊＊

9800136 Bergman This award focuses upon the dynamics, control and reliability of short span highway bridges, many of which have experienced a sharp decrease in expected service life due to loading induced by heavy truck traffic. Some of these bridges are approaching the end of their useful lives and will require extensive rebuilding or replacement unless alternate, preferably less costly, ways are found to reduce stresses and strains that arise from traffic loads. The project examines several aspects of this problem, including the development of high resolution control-oriented models that account for important effects such as vehicle-structure dynamic interactions, bridge and roadway condition, and traffic intensity, as well as identification and evaluation of candidate intelligent response reduction schemes that work primarily through tuning of individual vehicle suspensions and bridge parameters. The problem embodies a number of components particularly related to problems of scale and structure and to interplay between computations and data. Among the former, the dynamic interaction of potentially many vehicles with the bridge under highly variable traffic conditions, with concurrent adaptivity of individual vehicle suspensions prior to entering and even while on the bridge, represents an extreme case of multiple scales in both space and time. The latter is, of course, highly contingent upon remote sensing, communications, adaptivity, and assessment, all in real time, and represents a real challenge to the computation/data interface. ***