桥梁结构与设计英语文献及翻译
Structure theory and design
(1) bridge structure holds tier of calculation with in theory to bridge floor shop , gives the recommendation value having fixed thickness [7] , The project boundary has applied several tens years to every grade highway always middle. Already be out of keeping with the fact that the volume of traffic enhancing, active shop hold increasing with the heavy type, increasing by and speed of a vehicle surpassing the heavy type automobile with quickly. The bridge floor lays the impingement pretending to bear carriage wheel load tier directly , the bridge floor lays the deformation having loaded the part or all participation betokening girder construction , bridge floor shop pretends to be a main beam accepting the strenuously complicated driving force system , various form and the distribution laying the structure pretending to be self affect whose strain equally therefore.
(2) Bridges currently in effect: ...... The regulation also may consult the T shape beam if there being no accurate reckoning; the box shape beam handles [9]. Judging from a lot of box beams design, the most designer is to handle to box beam component be in progress according to T shape beam. Box beam reality accepts but a force though having one aspect bordering on the T beam, one aspect having being different from the T beam, the with regard to continuous box beam difference are bigger. Especially box beam bridge floor is in recent years more and more broad, ratio of bay and bridge width is more and more small , does that long thin member still design the box beam according to T beam matching tendon , push down with regard to more and more no proper , leading to? The box beam framework reinforced bar that the beam designs is difficult to bring the due effect into play like T beam host tendon under actual strenuously circumstances. Therefore, the hypothesis states designing that and box beam reality accept force state disaccords.
(3) With material, development of industry, architectural bearing bridge improvement, make bridge host Liang Neng more and more broad reaching the request accepting a force, big advanced level highway transverse direction across bridge with softer structure. Stiffness attaches importance to bridge transverse direction deficiency , disadvantageous messenger of transverse direction structure measure bridge floor shop pretends to have shared more than the correct or required number time of internal forces especially in the analysis designing that the middle secretly scheming against puts particular emphasis on the calculation in main beam direction.
(4)To bridge type structure such as continuous beam bridge , arch bridge and cantilever beam bridge, effect because of load but produce negative curved regulation or pulling force , make the bridge floor lay the effect pretending to accept pulling force tier but produce the breakdown shouldering the curved regulation area rift , bringing about bridge floor shop dress thereby.
(5) manages middle in the organization who carries out traffic on the express highway , different since the lane is functional, person has been to compel a field to make bridge structure be in motion and do business all the time in insisting to be loaded with state , has made host lane shop horizontal holding the strain having born ratio overtaking Daogaodeduo (magnitude but having amounted to three till quitter) to be in motion and do business with , has accelerated the host lane therefore laying the strain installing a tier.
Especially with the development of private carrying trade, the freight proprietor is to run after short-term economy benefit , the load , axle load on rail and wheel by changing compartment structure if lengthening a compartment and heightening axle spring and so on uses an automobile are loaded with to increase by several times. These vehicles are had to shop dress tier destroying an effect gravely, are make bridge structure part overload and, have accelerated the host lane shop the disease installing a tier development. Therefore, should distribute condition according to the reality that the vehicle loads in being in motion and doing business in design , pretend to be in progress tier being secretly schemed against by the force on the basis having made clear that bridge structure accepts a force, to bridge floor shop.1201