Language: English
Bridge strengthening
Perfusion steel plate bonding to bridge
On the premise of guaranteeing the effect of strengthening quality, from two aspects of comprehensive consideration of saving the cost of engineering investment and completing the reinforcement as soon as possible, reducing the influence and loss on the social and economic aspects, it is recommended that the perfusion bonded steel plate reinforcement method is recommended.
In 2008 April, there were many transverse cracks and a large number of longitudinal cracks in the main girder floor of the bridge. The most serious is 30m span, the most transverse cracks appear, one of the most serious transverse cracks appear in the right 35 wrong beam, the width is more than 2mm, and there are some longitudinal cracks, while most longitudinal cracks appear in the 20m span; the 50m span also appears some longitudinal cracks and several transverse cracks.
The longitudinal bearing capacity of bridge hollow slab structure can not meet the current code requirements.
The maximum distortion tensile stress at the corner of 30m hollow core slab before reinforcement is 1.75Mpa, which is the fundamental reason for longitudinal cracks in the hollow slab.
In the normal serviceability limit state calculation, the 30m span bearing capacity can no longer meet the current code requirements.
According to the above conclusion, in order to ensure the normal operation of the bridge and improve the safety of the overall structure of the bridge, the management unit (owner) decides to strengthen the structure of the main girder of the bridge.
For owners, the completion of reinforcement works one day earlier can reduce losses in all aspects one day, and for contractors, the construction cost can also be reduced. Therefore, on the premise of guaranteeing the effect of strengthening quality, from two aspects of comprehensive consideration of saving the cost of engineering investment and completing the reinforcement as soon as possible, reducing the influence and loss on the social and economic aspects, it is recommended that the perfusion bonded steel plate reinforcement method is recommended.
The results of the static and dynamic load measured by the attached steel plate show that the joint force between the steel wrench and the concrete is synergistic. To a certain extent, the longitudinal tensile stress of the concrete of the sorghum bottom is reduced, and the distortion of the hollow plate is greatly reduced. The bearing capacity of the hollow slab strengthened by bonded steel meets the requirement of highway I street loading.
