The Calculation And Design Of The Longitudinal Undamping Restraint Device

Briefly introduce the earthquake damage of bridge structure,mainly is to fall beam respect, and sum up the experience and lesson learned from the bridge of the earthquake damage;Briefly describe the general condition of domestic and international anti-fall beam reaserch and significance of this sdudy and the main content.Domestic device of travel limit switch generally used only as structural measures,without calculation and design,very hard to get up the function of anti-fall beam in the earthquake. This paper make dynamic analysis under the arouse of strong earthquake to the structure which is installed no damping longitudinal direction device of travel limit switch.In the structure under strong earthquake device of travel limit switch not only can play defence of fall beam,but also can increase the structural integrity,and can improve the structure's rigidity.According to analysis,we obtained the law of variation between the force of device of travel limit switch,the effect of anti-fall beam and its rigidity,the initial clearance,site soil,finall obtained the most reasonable limit device parameters for this example,and for this bridge in the thesis desiged concrete block.