Large-span Double-limb Rigid Frame Bridge With Bcsw Study

Bridge is an important infrastructure, is the arteries of social and economic development,is the lifeline of city. Bridge construction brilliant achievements obtained in leapfrogdevelopment at the same time, the recent domestic happened bridge safety accident willbridge back to the outlet wave, so that the bridge safety problem to cause the attention of thewhole society. it is imperative to learn Lessons, take effective countermeasures andimplementation of scientific design, construction, etc. In the survey and maintenance ofbridge, they have been discovered common PC continuous beam bridge across the webcracking and scratching under two diseases.The PC-span continuous beam bridge crackingunder the scratch and web-depth study of the two diseases, the basic reason of its structure inorder to find practical methods of prevention and treatment of bridge engineering in Chinacurrently very urgent task.For a long time, Chinese PC design permits continuous beam than common problems arenot structural cracks accurate and reasonable interpretation of the bridge engineeringcommunity is very disturbed. Paper first crack of our situation and characteristics of thebridge to make a brief analysis of the reasons web crack, from the inherent defects of concreteand the "bridge rules" imperfect two points of view, put forward a number of new controlmeasures to overcome the web shear stress and tensile stress cracks in the main difficulties.Downward deflection in the study of phenomena across the proposed regulations inChina bridge mid-span deflection for PC Girder Bridge in dead load allowed value [ft] theirrational: generally use live load deflection f_p is equal to [L/600] instead. Our school afternearly20years of research, think it is an important reason caused by Chinese PC generallycontinuous beam under downward deflection and bottom cracking. Through the paperanalysis, it puts forward design should be controlled before the close initial deflection [f₀]more than L/4800to ensure the safety.of bridge.Through to the PC continuous girder bridge for a common web crack and scratch acrossthe two diseases under study, it is considered that the use of "dead load zero moment" conceptfor bridge design and the introduction of double-limb BCSW materials, is to solve the twomajor disease a really feasible measures. Research hopes for bridge design and reinforcementto provide technical reference.