Sensing issues in civil structural health monitoring by Farhad Ansari

By Farhad Ansari

Civil infrastructure platforms are in general the most costly resources in any nation, and those structures are deteriorating at an alarming expense. additionally, those structures have a protracted carrier lifestyles compared to so much different advertisement items. besides, the advent of clever fabrics and leading edge layout ways in those structures is painfully gradual as a result of heavy relianceon conventional building and upkeep practices, and the conservative nature of layout codes. suggestions at the "state of the overall healthiness" of developed platforms is essentially nonexistent. within the quest for lighter, more suitable and corrosion-resistant constructions, the substitute of ferrous fabrics by means of high-strength fibrous ones is being actively pursued in numerous international locations worldwide, either with admire to the layout of recent constructions in addition to for the rehabilitation and strengthening of current ones. In North the USA, energetic examine within the layout of latest street bridges is concentrated on a couple of uniqueness parts, together with the alternative of metal reinforcing bars in concrete deck slabs via randomly allotted low-modulus fibers, and the alternative of metal prestressing cables for concrete parts through tendons comprising super-strong fibers. examine can also be being carried out on utilizing FRPs to fix and improve present buildings.

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By Farhad Ansari

Civil infrastructure platforms are in general the most costly resources in any nation, and those structures are deteriorating at an alarming expense. additionally, those structures have a protracted carrier lifestyles compared to so much different advertisement items. besides, the advent of clever fabrics and leading edge layout ways in those structures is painfully gradual as a result of heavy relianceon conventional building and upkeep practices, and the conservative nature of layout codes. suggestions at the "state of the overall healthiness" of developed platforms is essentially nonexistent. within the quest for lighter, more suitable and corrosion-resistant constructions, the substitute of ferrous fabrics by means of high-strength fibrous ones is being actively pursued in numerous international locations worldwide, either with admire to the layout of recent constructions in addition to for the rehabilitation and strengthening of current ones. In North the USA, energetic examine within the layout of latest street bridges is concentrated on a couple of uniqueness parts, together with the alternative of metal reinforcing bars in concrete deck slabs via randomly allotted low-modulus fibers, and the alternative of metal prestressing cables for concrete parts through tendons comprising super-strong fibers. examine can also be being carried out on utilizing FRPs to fix and improve present buildings.

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Extra info for Sensing issues in civil structural health monitoring

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But in the case of Hyogo-ken Nanbu earthquake, it was very difficult to make immediate actions because no system to collect damage information had been developed. Based on the lessons from the 1995 Hyogo-ken Nanbu earthquake, seismic damage estimation system has been developed to approximately grasp the damage of structures in order to estimate the damage of the expressway network. The system obtains the strong motion data recorded along the expressway network shown in Figure 12. Using the strong motion data, the seismic intensity of the each branch route are roughly estimated in the divided zone with considering the site ground condition of each divided zone as shown in Figure 13.

All that is required is an ability to collect as much data as possible and as quickly as possible which is not as important to a State Bridge Engineer as estimating structural capacity or remaining service life. Prior to reviewing the current status of structural health monitoring, let us first reexamine the need for structural health monitoring of bridges. That need is based on the introduction of new materials in bridge construction, serviceability of the bridge after an extreme event, and the continued deterioration of the infrastructure.

3. 4. 5. Adachi Y, Momozawa M, Hasegawa Y, Horie R. , September, 1996. Okada H, Ishizaki Y, Shirao K, Hagiwara H. "A proposal of a new inspection technique for highway bridges", Proceedings of the conference on nondestructive inspection, 2000. (In Japanese) Ueda K, Hirose T. (In press) Adachi Y, Unjoh S. , August, 1997. Miyawaki K, Kagayama T, Okunishi F. "The system of Real-time Earthquake Damage Estimation in Hanshin Expressway", Proceedings of US/Japan Bridge workshop, Tsukuba, Japan, October, 2000.

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