基于准静态影响面理论的桥梁快速评定新技术

发布时间：2018-02-16 15:40

本文关键词： 准静态影响面桥梁快速评定　出处：《河北工业大学》2014年硕士论文　论文类型：学位论文

【摘要】：桥梁是交通运输中的重要组成部分，如何对现有桥梁进行有效检测，做出科学评估，充分了解桥梁实际工作状况，验证承载力能否满足设计或规范要求，是适应公路运输不断发展，保障桥梁运营安全的必然要求。本文首先对现有检测技术作了概述，结合国内外研究现状总结了现有桥梁检测加固技术常用手段及技术指标；其次针对常见桥型介绍了结构承载力检算中所应用的常规计算方法，并通过实桥数据分析得出：传统的计算方法在精度上有很大误差，并且对于现代高速发展的桥梁技术已凸显其局限性，进而提出了精准影响面代替简化影响面的理论。第三章基于线弹性结构的内力影响面概念，及静力法求影响面理论，，提出了机动法求内力影响面概念。基于虚功原理，通过对六面体单元的求解，导出了求内力影响面的普遍公式，并且可用于五面体或四面体的求解。该方法可以很快的求得目标点的内力影响面，可以满足普遍工程实际需求。随着交通量逐渐增大，对桥梁检测，尤其城市繁忙路段的桥梁检测工作提出了更高的要求，而且常规检测中加载工况太少，且加载位置存在很大偏差。基于此本文第四章开发了基于影响面的车道荷载及汽车荷载准静态加载理论，这种方法可以很精确的定位载荷汽车的位置，很且用时少，可识别工况多，从理论上说数据也更准确可靠。第五章通过实验室实桥试验对前面几种理论作了验证，并基于此，针对桥梁检测技术形成新的成套理论“基于准静态影响面理论的桥梁承载能力快速评定”，并且通过是模型桥梁的验证。这种方法能精确的得出检测载荷所在位置，使理论加载效率系数为1，且对汽车载重掌握比较灵活；较常规检测方式避免了传统的静荷载试验数据工况较少的缺点，可以极大的缩短检测时间，更适应现在的交通要求。
[Abstract]:Bridge is an important part of transportation. How to effectively detect the existing bridge, make scientific evaluation, fully understand the actual working conditions of the bridge, verify whether the bearing capacity can meet the requirements of the design or specifications. It is an inevitable requirement to adapt to the continuous development of highway transportation and ensure the safety of bridge operation. First of all, this paper summarizes the existing detection technology, combined with the current research situation at home and abroad, summarizes the existing bridge inspection and reinforcement technology commonly used means and technical indicators; Secondly, the conventional calculation methods used in checking and calculating the bearing capacity of structures are introduced for the common bridge types, and through the analysis of the actual bridge data, it is concluded that the traditional calculation methods have great errors in accuracy. And for the modern high-speed development of bridge technology has highlighted its limitations, and then put forward a precise influence surface instead of simplified influence surface theory. In the third chapter, based on the concept of internal force influence surface of linear elastic structure and the theory of static force method to find influence surface, the concept of maneuver method is put forward to calculate the influence surface of internal force. Based on the principle of virtual work, we solve the problem of hexahedron element. The general formula for calculating the influence surface of internal force is derived, and it can be used to solve the problem of pentahedron or tetrahedron. With the increase of traffic volume, higher requirements are put forward for bridge detection, especially for bridge detection in busy sections of the city, and there are too few loading conditions in conventional detection. Based on the 4th chapter of this paper, the quasi-static loading theory of driveway load and vehicle load based on influence surface is developed. This method can locate the position of vehicle accurately, and it takes less time. There are many identifiable working conditions, and theoretically the data are more accurate and reliable. In Chapter 5th, the previous theories are verified by laboratory experiments, and based on this, In view of the bridge detection technology, a new set of theory "Bridge bearing capacity Evaluation based on Quasi-static influence Surface Theory" is formed, and it is verified by the model bridge. This method can accurately get the location of the detection load. The theoretical loading efficiency coefficient is 1, and it is more flexible to grasp the vehicle load. Compared with the conventional testing method, it avoids the disadvantages of the traditional static load test data less working conditions, can greatly shorten the detection time, and is more suitable for the current traffic requirements.
【学位授予单位】：河北工业大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U446.3

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