發(fā)布時間：2018-10-15 12:02

【摘要】：隨著橋梁事業(yè)的蓬勃發(fā)展,新的橋梁結構形式不斷涌現(xiàn),矮塔斜拉橋就是一個典型代表,其受力性能介于連續(xù)梁橋和斜拉橋之間,且造型新穎、組合形式豐富、易與環(huán)境融合,因此在國內外得到了廣泛應用。為了保證結構在施工過程中的安全、成橋狀態(tài)結構內力和線形滿足設計目標,對矮塔斜拉橋進行施工控制研究有著重要的現(xiàn)實意義。以常山大橋為工程背景,首先運用有限元分析軟件Midas/Civil建立基于梁單元的有限元模型,并使用正裝迭代法求解合理施工索力。在此基礎上,對全橋施工過程進行仿真模擬,計算分析了結構在各施工階段的內力和變形,由此驗證施工方案的合理性。同時,針對平行鋼絞線斜拉索體系,以無應力狀態(tài)法為理論核心計算出單根鋼絞線張拉力大小,保證鋼絞線之間索力的均勻性,實現(xiàn)等值張拉。其次,對矮塔斜拉橋施工控制過程中各影響參數進行敏感性分析,獲取主要敏感性參數,并根據現(xiàn)場測試結果分析誤差原因,采用最小二乘法進行參數識別,并將修正后的參數反饋到模型中,使得有限元模型與實際結構力學響應逐漸逼近。最后,根據常山大橋的施工控制方案,詳細介紹了本橋線形和應力的控制方法,通過立模標高和斜拉索初張拉大小指導梁段施工。通過控制結果分析,可知施工過程線形滿足要求,應力處于安全可控范圍,成橋結構滿足設計預期要求。
[Abstract]:With the rapid development of the bridge industry, new bridge structure forms are emerging constantly, the short tower cable-stayed bridge is a typical representative, its mechanical performance is between continuous beam bridge and cable-stayed bridge, and the shape is novel, the combination form is rich, easy to blend with the environment. Therefore, it has been widely used at home and abroad. In order to ensure the safety of the structure during the construction process, the internal force and the linear shape of the state structure of the bridge meet the design objectives, so it is of great practical significance to study the construction control of the cable-stayed bridge with low tower. Taking Changshan Bridge as the engineering background, the finite element model based on beam element is established by using finite element analysis software Midas/Civil, and the rational construction cable force is solved by means of formal iteration method. On this basis, the construction process of the whole bridge is simulated, and the internal force and deformation of the structure in each construction stage are calculated and analyzed, which verifies the rationality of the construction scheme. At the same time, aiming at the cable system of parallel steel strand, the tensile force of a single strand is calculated with the stress free state method as the theoretical core, so as to ensure the uniformity of the cable force between the steel strands and to realize the equivalent tensioning. Secondly, the sensitivity analysis of the influence parameters in the construction control process of the low tower cable-stayed bridge is carried out, the main sensitivity parameters are obtained, and the error causes are analyzed according to the field test results, and the least square method is used to identify the parameters. The modified parameters are fed back to the model, which makes the finite element model approach to the actual structural mechanical response. Finally, according to the construction control scheme of Changshan Bridge, the control methods of the bridge alignment and stress are introduced in detail. The construction of the beam section is guided by the elevation of the vertical formwork and the initial tension size of the stay cable. Through the analysis of the control results, it can be seen that the line shape of the construction process meets the requirements, the stress is in the safe and controllable range, and the bridge structure meets the expected design requirements.
【學位授予單位】：東北林業(yè)大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：U445.4;U448.27

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