本设计的步骤为：根据设计任务要求，依据现行公路桥梁设计规范,综合考虑桥位的地质、地形条件，经初选后提出了斜拉桥方案、悬索桥、拱桥三个比选桥型。
按"实用、经济、安全、美观"的桥梁设计原则，比较三个方案的优缺点。比选后把斜拉桥作为主推荐设计方案，进行了结构细部尺寸拟定、静活载内力计算、钢主梁应力强度、疲劳验算、斜拉桥整体稳定验算、斜拉桥整体强度应力验算、拉索应力及疲劳验算、钢主梁细部结构设计。经分析比较及验算表明该设计计算方法正确，内力分布合理，符合设计任务的要求。关键词：方案;斜拉桥；拱桥；悬索桥；主推荐设计方案；结构分析；验算。
Department: Bridge, Highway College, Chang'an UniversityAbstract: the process of designment：According to the design assignment and thepresent Highway Bridge Specifications, Take the geological and the landform of thebridge site for further analysis, after preliminary selection, three bridge type schemas arepresented, they are Cable-stayed bridge, Suspension bridge and Arch bridge. Comparing their characters comprehensively, the Cable-stayed bridge is selected as the main designscheme by the philosophy of bridge design as "Practicability, Economy, Security, Beauty".
Through drawing up of structure's dimension, internal force calculation of dead and living load, steel beam stress and strength calculation, fatigue stress calculation, the whole bridge strength calculation, checking computation of cable stress and fatigue stress, livingload distortion, drawing up of steel beam's dimension. The conclusion can be drawn that the design is up to the assignment.Key word: Design ; cable-stayed bridge; Arch bridge;Suspension Bridge; Steelbeam;Fitague stress; the main design scheme for further analysis ; Structure analysis and checking computation
