qr code c# wpf Further Studies of Continuous, Long-Term Monitoring of Two Advanced Polymer Composite Bridges in Software

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1156 Further Studies of Continuous, Long-Term Monitoring of Two Advanced Polymer Composite Bridges
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1 Harry W Shenton III, Michael J Chajes, William L Johnson, Dennis R Mertz, Jack W Gillespie and their team designed a continuous, long-term monitoring systems for two polymer composite bridges recently built in Delaware The Magazine Ditch Bridge has been continuously monitored for more than a year The monitoring system provides data to investigate the effects of sustained load, environmental factors and live load on the bridge Early results show that daily and seasonal temperature changes can induce strains in the bridge that are equal in magnitude to the maximum live load strains 2 A similar system has been designed for the rst state-owned composite bridge in Delaware The monitoring system for bridge 1-351 is expected to be on-line by the summer 2000 Presented in the paper is a brief overview of the systems and sample results from the data collected for the Magazine Ditch Bridge 3 Strengthening of a concrete T-beam bridge using FRP composite laminates: Osman Hag-Elsa , Sreenivas Alampalli, and their team studied the application of ber reinforced polymer
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(FRP) composite laminates to strengthen a 70-year-old reinforced concrete T-beam bridge in New York Leakage at the joints of this single-span bridge led to substantial moisture and salt in ltration inthe superstructure as manifested in ef orescence, freeze-thaw cracking, and delamination at some locations Integrity of the steel reinforcing and overall safety of the bridge was suspected This concern was heightened by the absence of any documents pertaining to the bridge design, such as bar size, steel type, concrete strength, and design loads The bridge was strengthened using bonded FRP laminates Load tests were conducted before and after the FRP laminates were installed to assess effectiveness of the strengthening system Test results are also compared with those obtained analytically using classical approaches 4 Fiber reinforced polymer matrix composites (PMCs) are very effective for concrete rehabilitation and deck slab construction VDOT used it successfully for superstructure replacement of Tom s Creek Bridge For injecting hairline and wide cracks in concrete, epoxy injection resins are being effectively used For waterproo ng joints and cracks, sealing leaks and under water repairs to concrete Polyurethane Injection Resins are being effectively used
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1157 Lightweight Truss Bridge Rehabilitation Using Composites and FRP Deck
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According to FHWA, there are over 93,000 weight-restricted bridges in the US There are over 19,000 steel trusses which are well suited to lightweight rehabilitation Existing truss bridges can be made lighter by replacing a heavy concrete deck and numerous asphalt overlays with a lightweight FRP deck In addition, painting the steel members would increase the life of bridges As reported the 140 ft span Warren truss bridge carrying New York State s Route 367 over Bentley Creek in Chemung County built in 1940 found new life in 1999 after the installation of a 13 in thick, E-glass reinforced vinyl ester resin deck weighing only 32 psf This reduced the dead load by 80 percent and almost doubled the live load carrying capacity of the bridge: HS12 to HS23 to a level higher than the original design A 14-ton weight restriction was able to be removed and the bridge reopened to all legal loads The deck itself rates much higher than the bridge It meets L/800 de ection requirement with an inventory load rating of HS85 (154 tons) Load tests indicate that the actual capacity of the deck is even greater than these analytical ratings Many innovations were developed: 1 A haunch for each oor beam was uniquely precast to support the deck This placed the deck at the proper elevation, provided a new load path directly from the deck to the oor beams, raised it above the obsolete steel stringers, and delivered a 2 percent cross slope 2 The deck was replaced using six discrete deck panels The modular construction simpli ed installation and reduced eld time 3 A eld splice system was designed to transfer shear and moment between panels The joints devised rely on FRP cover plates and structural adhesives The watertight deck protects the steel oor system from the weather
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