The Main Bridge Of LongHua Bridge Over Songhua River Aseismatic Design And Plane Project Compare

Bridge engineering is the Life Line engineering.If the bridge was damaged, not only the bridge results in huge economy lose, and give earthquake behind the relief works to bring huge difficulty, make the time living the disaster to aggravate.Because the heavy earthquake of the occurrence in history brings huge disaster for bridge, urging the people to study and understand the natural disaster of this kind of special, form the method and theories of bridge aseismatic design, example for statics method, response spectra method and dynamic time-history analysis method.Statics method supposes the structure each part of thing and earthquakes to move to have the same vibration, the structure thing goes to the output and inertial dint of the acceleration of a function ground at this time, treat it as quiet the dint function carries on the anti- earthquake calculation in the structure thing.Quiet dint method it is the structure earthquake that the earthquake acceleration see make break of one factor, neglected the motive characteristic of the structure, have obviously to limit sex biggest.Response spectra method is the method of extensive usage in the structure aseismatic design currently, The method include two basic steps:The first step gain response spectrum for aseismatic design;The second step is vibrate structure the square distance carry on flapping a decomposition, move the physics to use to flap a broad sense to sit the mark to mean, but the broad sense sit the object biggest the value respond table to beg from the design.End, the biggest value that responds the quantity can pass appropriate method will each flap the biggest value in a reaction set to put together to get.Dynamic time-history analysis chases the direct importation of the earthquake acceleration timing, carrying on the earthquake timing reaction analysis to the structure.It can consider severals of soil- structure interaction, structure and physics not line, various reduce to separate the earthquake device not line, the earthquake a phase shift and differently many weights of seismic wave much order to input etc. factor, make the result to match the actual earthquake to harm the phenomenon more, make the bridge earthquake calculation is from the one strength the assurance turn into the strength, transform of dual assurance, make structure the engineer even knows the mechanism that the structure earthquake break and exactitude to raise the structure shakes the ability of path, also for develop two the stage earthquake calculation method provided the analytical foundation.This text with the main bridge of LongHua bridge over Songhua River Aseismatic Design for the engineering background, Half-regid structure and continuous box girder project and tower cable-stayed bridge project to adopted to response spectra method to carry on the earthquake respectively reaction analysis.On this foundation, combine the everyone to face the factor to carry on economic technique compare of the bridge project.In response spectra analysis process, respond to the half-regid structure and continuous box girder project and tower cable-stayed bridge project into action analytical according to the flexibility response spectra theories and the engineering place safety evaluation report. Through the analysis: Half-regid structure and continuous box girder project can satisfy the earthquake design request after adoption the equipment of Lock-up;Whole afloat the system is inclined pull the bridge project earthquake function good, need to adopt the beam to carry to limit a device only to satisfy the anti- earthquake design request then.In project compare choose process, mainly aim at the main bridge project of satisfy the earthquake design request, shook the difficult easy degree, structure shape of function, economic index sign, usage the function, the navigation condition and the empress periods carry the camp cost etc. carry on economic technique Analysis, the end certain Half-regid structure and continuous box girder project recommends the project for the main bridge.