【作者】 潘春风；

【导师】 季文玉；

【作者基本信息】 北京交通大学 ， 桥梁与隧道工程， 2007， 硕士

【摘要】 RPC材料作为一种新型的水泥基复合材料,具有高强、高韧性、高耐久性、良好的经济性能和环保性能等特点,其性能比普通、高强混凝土具有更大的优越性。当前RPC已成为国际工程材料领域一个新的研究热点,但目前我国对RPC的研究仅限于材料性能阶段,对RPC在结构设计及应用方面的研究较少。针对目前现状,本文主要对RPC应用于铁路预应力桥梁在结构设计以及受力方面进行研究。本文研究的主要内容是用RPC替代普通混凝土用于铁路预应力简支T梁,通过建立ANSYS有限元模型和采用初等桥梁结构理论分别进行计算,验证结构的可靠性与设计的合理可行性,在此基础上重点对端块局部应力进行分析与研究。本文分别对结构在预加应力和荷载作用两个受力阶段,分别对预应力传递长度、端块局部应力影响范围、端块的横向应力分布以及端块主拉应力等进行了有限元分析求解,并将有限元分析得出的数值解与利用初等桥梁理论得出的理论解进行分析对比,得出了在特定条件下的预应力传递长度和端块应力分布特征。本文作为一种尝试性研究,为今后RPC在结构领域的应用与研究提供参考。更多还原

【Abstract】 As a new type of compound material, Reactive Powder Concrete(RPC) has many characteristics such as high-strength,high-tenacity,high-durability,good economic function,good environmental protection function and etc. RPC has much more superiority than the normal concrete and the high-strength concrete in its performance. At present ,Research on Reactive Powder Concrete(RPC) in China mostly focus on material performance rather than structural design. Therefore this paper will mainly make the tentative research to the structure design and loading analysis in the case that RPC is used in railway prestressed bridge.In this paper, the RPC, instead of normal concrete, is used in railway prestressed T beam. Both the ANSYS finite element model analysis and the theory analysis verify structure’s credibility and design’s rationality and feasibility, based on which to emphasize the research to the local stress of the end block.According to the two stages of prestress and load,This paper compares the ANSYS finite element model analysis and the theory analysis by the prestressed lead-length, influence range of local stress, the lateral stress distribution in end block. At the same time, we compare the theory value to the calculated value which comes from finite element analysis procedure, finally get the prestressed lead length and the stress distribution characteristic at end block under the special condition.This paper, as a tentative result, offers the reference for the RPC’s application and study in its structural field in the future.更多还原