Common Diseases Impact On Reliability Of Highway Bridge In Dry-cold Area Of Northwest

Northwest dry-cold region mainly refers to the cold and arid regions in China, the regionare mainly distributed in the northwest of China, mainly including Xinjiang province all areas,Gansu province large area, Qinghai province region, Ningxia region all area, northern Shanxiand Inner Mongolia, north and northeast Qinghai-tibet plateau region, cold and dry. Due to theparticularity of the regional climate, the region of highway bridge often appear single plategirder with strength, crack and diseases such as freezing and thawing. Seriously affect thenormal service bridge, add the hidden trouble to safety. Therefore, research the meaning of thenorthwest dry-cold area highway bridge reliability is especially important.Based on the Lian-Huo expressway Gulang-Guazhou section highway concrete plategirder bridge as the engineering background, combined with the northwest regions wherehave dry-cold long cold season, freeze-up length, big temperature difference between day andyear in climate and environmental characteristics; Using theoretical analysis, numericalsimulation and field test, the method of across the desert and seasonal permafrost regions ofthe disease mechanism of concrete and reinforced concrete girder bridge and its effect on thereliability of the concrete girder bridge classification study and put forward the keytechnology of bridge diseases treatment and maintenance; Through bridge disease datacollection and observation research, put forward the dry-cold region bridge reliabilityprediction model of concrete and the curing technology, it is concluded that the reliability ofthe evaluation of concrete girder bridge of the practical theory and technical methods. Tocalculate structure reliability index, the numerical simulation to study the effects of disease onthe bridge structure reliability, summarizes some bridges disease monitoring, strengtheningmethods used in the northwest dry-cold area highway bridges. This article mainly has carriedon the following work:(1) The scene investigation and access to relevant data, introduces the causes of cracks,single plate girder with strength phenomenon, summarizes the northwest regions where havedry-cold disease types;(2)Combined with previous research results, summed up the mechanism of crack, singleplate girder with strength diseases;(3) The bridge structure reliability theory research;(4)The combination of crack calculation theory, study the effect of crack ofreinforcement corrosion and reliability;(5) The application of finite software simulation plate girder bridge single plate girderwith strength model;(6) Analysis of single plate girder with strength phenomenon effect on reliability ofbridges;(7)Combined with bridge reinforcing technology is put forward in view of the Lian-Huo expressway(Gulang-Guazhou section)K241+864bridge disease monitoring and controltechnology.