【摘要】 在钢结构中采用预加应力的方法，可以提高承载力、减轻自重、节约钢材、降低造价。文中介绍了预应力钢桁梁主桁设计的方法与步骤，编制了一套相应的设计计算程序来实现这一过程，并用该程序对采用单根直线预应力筋和双根直线预应力筋的预应力钢桁梁桥主桁杆件进行了计算与分析更多还原

【Abstract】 The application of prestressing in steel structures can improve the load bearing capacity, decrease the weight,save the steels, and reduce the cost. The design method and procedures of prestressed truss in railway bridges are discussed. A program to perform the corresponding calculation has been written, and used to analyse the main trusses with a single straight tendon and with double straight tendons respectively.更多还原