先简支后连续预应力空心板梁受力分析研究及设计要点

研究目的：采用先简支后连续预应力空心板梁，既施工便捷、节省投资，又可极大改善桥梁的行车舒适性，应用愈来愈广泛，需要对这种连续梁结构进行分析研究。 研究方法：利用结构计算程序，掌握先简支后连续预应力空心板梁结构的受力特点。同时将先简支后连续预应力空心板梁与其他类似结构进行比较，分析其经济指标。 研究结果：解决了先简支后连续预应力空心板梁结构计算的难点和要点，达到了预期目的。 研究结论：应该将现浇整体化层作为受力单元进行分析；墩顶连续段应满足钢筋混凝土结构承载能力极限状态下的要求；先简支后连续预应力空心板梁的预制空心板部分应该按照A类或B类预应力构件设计要求设计；先简支后连续预应力空心板梁结构在中等跨径连续梁结构中具有较高的竞争优势，结构安全经济。

The Structure Analysis Studies and Design-essentials of the Continuous Hollow Slab Beam Erected as Simple-supported Beam in Advance

Research purposes: In order to improve the comfort when driving through the bridge,some client required that the continuous hollow slab beam erected as simple-supported beam in advance should be adopted in the design.So the author made some analysis of this structure. Research methods:Using the structrue calculation program,this paper gets the stress characteristic of continuous hollow slab beam erected as simple-supported beam in advance.At the same time,this paper compared the continuous hollow slab beam erected as simple-supprted beam in advance with another similar beam structures and the economic indicators are also analyzed. Research results:The difficulties and main essentials of the calculation of continuous hollow slab beam erected as simple-supported beam in advance are resolved,and the anticipated goal is achieved. Research conclusions:The leveling course of bridge deck should be regarded as stress unit.The calculation of cast-in-place section of the beam above the pillar should be carried on according to the reinforced concrete component.Regarding prefabricated hollow slab beam,the calculation should be carried on according to pre-stressed concrete component of sort A or sort B.The continuous hollow slab beam erected as simple-supported beam in advance has competitive advantage in the medium span continuous beam structure and the structure is safe and economical.