基于箱梁反置的加载试验系统设计研究

发布时间：2018-04-08 15:04

本文选题：加载装置　切入点：箱梁反置　出处：《长安大学》2015年硕士论文

【摘要】：90年代以来,我国桥梁的数量日益剧增,随着时间的推移都已成为旧桥,截至今日,我国旧桥数量已非常庞大。桥梁在车辆、外界环境、人为因素等的影响下,会出现病害和缺陷,严重影响桥梁的正常使用。因此,对既有桥梁结构进行承载能力和安全性评估是现阶段需要解决的热点问题之一,同时,还应对既有桥梁的受力性能进行不断深入的研究分析。实桥试验作为对既有桥梁进行结构分析的最直接有效的方法,可以对既有桥梁进行全过程的受力分析,并在试验过程中得到各个阶段的力学性能,从而可以更加精确地了解和预测既有桥梁在不同荷载作用下的结构性能及其实际承载能力,因此具有较大的实际意义。但是由于现有试验设备和加载方式的限制,实桥试验一直无法普及。因此,引入一种更为经济、安全、便捷、可靠的加载装置系统非常具体实际价值。本文以静载试验和桥梁结构承载能力理论为基础,以经济、安全、实用、便捷为原则提出了一种新型的实桥试验加载装置,并对其结构和加载方式进行初步设计。然后通过对预应力混凝土箱梁进行加载模拟整个加载过程,主要包括对倒置箱梁的应力及承载力分析、对反力梁的加固设计和试验梁及反力梁的加载全过程分析,最后证明该装置的可行性。
[Abstract]:Since the 1990s, the number of bridges in our country has been increasing rapidly, and with the passage of time, it has become old bridges. Up to now, the number of old bridges in our country has been very large.Under the influence of vehicle, external environment and human factors, the bridge will appear diseases and defects, which will seriously affect the normal use of the bridge.Therefore, the assessment of the bearing capacity and safety of the existing bridge structure is one of the hot issues to be solved at the present stage. At the same time, the stress performance of the existing bridge should be studied and analyzed in depth.As the most direct and effective method for structural analysis of existing bridges, real bridge tests can be used to analyze the whole process of existing bridges and obtain the mechanical properties of each stage in the process of test.Therefore, it is of great practical significance to understand and predict more accurately the structural performance and actual bearing capacity of existing bridges under different loads.However, due to the limitations of the existing test equipment and loading mode, the bridge test has been unable to be popularized.Therefore, the introduction of a more economical, safe, convenient and reliable loading device system is of great practical value.Based on the theory of static load test and bearing capacity of bridge structure, this paper presents a new type of real bridge test loading device based on the principle of economy, safety, practicality and convenience, and makes a preliminary design of its structure and loading mode.Then the whole loading process is simulated by loading the prestressed concrete box girder, including the analysis of the stress and bearing capacity of the inverted box girder, the reinforcement design of the reaction beam and the analysis of the whole loading process of the test beam and the reaction beam.Finally, the feasibility of the device is proved.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U446;U448.213

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