72m活性粉末混凝土预制节段拼装体外预应力简支箱梁受力特性研究

发布时间：2018-01-04 18:13

本文关键词：72m活性粉末混凝土预制节段拼装体外预应力简支箱梁受力特性研究　出处：《北京交通大学》2014年硕士论文　论文类型：学位论文

【摘要】：活性粉末混凝土(Reactive Powder Concrete,简称RPC)是一种新型的高性能混凝土,具有许多优越的性能。和普通混凝土相比,活性粉末混凝土在力学性能等方面都有很大的优势。预制节段拼装体外预应力技术近年来在我国公路桥梁领域中已得到大量的研究和应用。预应力节段拼装作为一种可靠、经济和实用的施工方法,目前已得到世界各国的普遍认可,而且在实际工程中得到广泛应用。体外预应力技术与预制节段拼装施工方法的结合应用是解决桥梁施工质量和施工速度矛盾的较好途径。本文主要对RPC应用于72m铁路预制节段拼装预应力简支箱梁桥在受力性能方面进行理论分析研究。将RPC和体外预应力技术及预制节段拼装技术相结合,形成大跨度简支箱梁桥,通过全过程加载分析,研究箱梁的静力性能。由于RPC材料具有较高的抗拉力学性能,本文针对预制节段拼装梁所用的干接缝的特点,采用了接触单元来模拟接缝间的相互作用。设计了RPC整体浇筑箱梁和湿接缝箱梁,并论证了整体梁和节段梁的区别以及干接缝和湿接缝的抗弯性能和抗剪性能。本文主要进行的是理论研究,可以为今后的RPC铁路预制节段拼装体外预应力混凝土箱梁的设计,研究和应用提供参考。
[Abstract]:Reactive powder concrete (Reactive Powder Concrete, referred to as RPC) is a new type of high performance concrete, has many superior properties. Compared with ordinary concrete, reactive powder concrete has great advantages in mechanical properties. The precast segmental external pre stress technology in recent years in the field of highway bridges in China have been get a lot of research and application. The prestressed segmental construction method as a reliable, economical and practical, has been widely recognized around the world, and is widely used in practical engineering. In vitro pre erection method should be combined with the application of force technology and precast segment is a better way to solve the quality of bridge construction and the construction speed is contradictory.
This paper focuses on the application of RPC in 72m railway precast segmental prestressed box girder bridge on mechanical properties were studied. Theoretical analysis will be RPC and assembly technology of external prestressing technology and precast segmental combined formation of large span simply supported box girder bridge, through the whole process of load analysis, the static performance of box girder.
The tensile properties of RPC materials is high, this paper used for precast segmental beam dry joint characteristics, using contact element to simulate the interaction between seams. The design of RPC integral casting box girder and wet joint box girder, and demonstrates the difference between the whole beam and segmental beam and resistance dry and wet joint seam bending and shear.
This article mainly carries on the theoretical research, and it can provide reference for the design, research and application of RPC railway precast segment assembling external prestressed concrete box girder.

【学位授予单位】：北京交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U441

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