Real-time monitoring of large scale structures

加拿大的桥梁暴露在环境和人为条件下，可能导致结构部件过早损坏和劣化。积极主动的修复策略要求有能力在损伤相对较小的情况下发现损伤，并评估使用可能不符合当前规范的材料建造的构件的承载能力。萨斯喀彻温大学目前正在研究最先进的振动测量技术，以便在非常早期的阶段检测到损伤。即使是轻微的损伤也会导致桥梁的振动特性发生变化。如果可以检测到这些变化，当损伤相对较小时，识别损伤位置是可能的。目前正在进行实验室和现场测量。未来的研究还包括对接近使用寿命结束的桥梁进行现场测量。监测此类结构将提供一定程度的保证，确保它们继续可靠地发挥作用。许多使用普通钢筋建造的历史建筑现在需要修复。尽管这些构件的基本轴向反应是已知的，普通钢筋与周围混凝土之间的粘结特性还不是很清楚。在拉出试件和弯曲试件中，大量测量的普通钢筋被用来评估粘结的力学性能。需要对弯曲构件中的仪器进行同步采样，以确定引发失效的机制，并捕捉拔出试件中钢筋卸载端滑移增加时的粘结劣化。但是，这两个项目都需要数据采集设备(DAE)，该设备能够同时从大量传感器上采样读数。尽管萨斯喀彻温省大学的DAE目前没有足够的能力。但所要求的设备将把专门用于研究的数据采集系统从16个同时传感器扩大到88个。

Bridges in Canada are exposed to environmental and man-made conditions that can lead to premature damage and deterioration of structural components.  A proactive rehabilitation strategy requires the ability to detect damage when it is relatively minor, and to assess the load-carrying capacity of members constructed with materials that may not conform to current specifications.     Vibration measurement techniques are currently being investigated at the University of Saskatchewan to detect damage at a very early stage.  Even minor damage results in changes to the vibration characteristics of a bridge.  If these changes can be detected, it may be possible to identify locations of damage when it is relatively minor.  Both laboratory and field measurements are being conducted.  Future research also includes the field-instrumentation of bridges nearing the end of their useful service life.  Monitoring such structures will provide a level of assurance that they continue to perform reliably.     Historical structures built using plain steel reinforcement are now in need of rehabilitation.  Although the fundamental axial response of these members is known, the characteristics of bond between the plain reinforcing bar and the surrounding concrete are not well understood.  Heavily instrumented plain reinforcing bars in pullout and flexural specimens are being used to evaluate the mechanics of bond.  Simultaneous sampling of the instrumentation in flexural members is required to identify the mechanism initiating failure, and to capture the deterioration of bond with increasing slip at the unloaded end of the bar in pullout specimens.     Both of these projects require data acquisition equipment (DAE) that is capable of sampling readings from a large number of sensors simultaneously, both in the laboratory and at various field locations.  The DAE at the University of Saskatchewan does not currently have sufficient capacity.  The requested equipment will expand the data acquisition system devoted to research from sixteen to eighty eight simultaneous sensors.