鋼管混凝土格構(gòu)式高墩的地震響應(yīng)分析與研究
[Abstract]:With the rapid development of transportation in China, the number of high pier bridges built to cross large gullies is increasing gradually. Because of the limitation of pier height, ordinary mass concrete pier is difficult to meet the requirement. Concrete filled steel tube (CFST) structure has the characteristics of high bearing capacity, corrosion resistance, easy construction, excellent seismic performance and so on. People begin to try to apply the concrete filled steel tube (CFST) structure of arch bridge superstructure to pier, which is widely used in house construction, arch bridge superstructure, and so on. Especially used in high pier, long span complex type of bridge. Since there are few concrete engineering examples at home and abroad, it is necessary to study the seismic response of concrete-filled steel tube (CFST) lattice piers. Some meaningful conclusions have been accumulated to provide some references for the extension, design and construction of this type of piers in the future. In this paper, a new type of steel truss cable-stayed bridge with steel truss with two towers and two cable planes is used as the background. The main pier is a new type of structure with concrete filled steel tube (CFST) lattice structure and the height of the main pier is 172ms. in this paper, the span of the main bridge hole is (72 174 324 174 72) m. The whole bridge model is built by midas Civil software, and the seismic response is analyzed and studied. The following are the main works: (1) introduce the research achievements and development status of CFST at home and abroad and the advantages of CFST compared with traditional reinforced concrete. (2) according to the information of site conditions and bridge types, Artificial seismic waves were fitted by SIMQKE software, linear time-history analysis of the bridge was carried out by using uniform earthquake input, and the seismic response of concrete-filled steel tube (CFST) piers at different horizontal input angles of 0 擄30 擄(45 擄) and 60 擄(75 擄) ~ 90 擄(90 擄) and considering the combination of vertical ground motion were studied, respectively. Through comparative analysis. (3) the nonlinear elastic-plastic analysis of the bridge is carried out by using fiber model, and the elastoplasticity, yield and failure sequence of the main pier and steel pipe under the action of rare earthquake are studied, as well as the cross section state at different heights. Thus, the location of plastic hinge is determined. It provides a reference for the capacity design of this type of pier in the future. (4) taking the different wave velocities of 150 m / s ~ 200 m / s ~ (200 m / s) ~ (200 m / s) and infinity, respectively, the seismic response of the pier under the condition of non-uniform seismic input considering the traveling wave effect is studied, and the linear time-history comparative analysis is carried out.
【學(xué)位授予單位】:蘭州交通大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2017
【分類號(hào)】:U442.55
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