覆土波纹钢桥涵长期受力性能研究

发布时间：2018-05-14 03:36

本文选题：覆土波纹钢板桥涵 + 试验研究　；参考：《北京交通大学》2016年硕士论文

【摘要】：近年来,我国公路交通建设发展势头迅猛,覆土波纹钢板桥涵作为一种新型结构形式,在我国公路工程建设中正得到越来越广泛的重视。但是由于我国大批量的应用时间比较短,对不同截面形式波纹钢板桥涵受力性能的研究仍处于起步阶段,尤其对该类型结构应用到不同地貌和地质条件下的长期受力性能的研究明显滞后。因此,本文对不同线形结构的受力特点及该类结构长期受力性能进行现场试验研究及有限元数值分析,具有重要的理论研究意义和实际应用价值。本文以4米直径圆管和8.1米跨径管拱波纹钢板桥涵为依托,通过现场长期监测试验和有限元数值计算相结合的方法,研究了管拱形截面波纹钢板桥涵和圆形截面波纹钢板桥涵在填土施工完成后的长期受力性能及其影响因素。通过对现场实测土压力和应力数据的研究分析,发现了温度和基础沉降对波纹钢板桥涵长期受力性能有着较大影响,特别是对结构所受应力影响显著。因此,通过建立二维有限元模型,具体分析了温度和基础沉降对不同截面形式波纹钢板桥涵应力和土压力的影响。研究和分析结果表明：在施工结束后长期作用阶段,管涵所受土压力变化主要受土体沉降密实的影响,土体沉降密实总体有利于土体与结构相互作用的发挥,而温度则对光栅光纤传感器长期测试数据影响较大,去除温度影响后各测点应力有所增长,但增长缓慢,且在一段时间以后,甚至有减小趋势,这与土压力长期变化趋势相互印证,说明波纹钢板桥涵长期受力性能将逐渐趋向对结构有利方向发展；不同截面形式波纹钢板桥涵受力特点也有所不同,管拱形截面桥涵水平土压力相比竖向土压力变化较大,且温度对管中受力影响比管顶显著,而圆形截面桥涵水平土压力与竖向土压力变化相差不大,温度对管顶受力影响比管中显著；波纹钢板桥涵对于基础沉降有较好的适应性。
[Abstract]:In recent years, highway traffic construction in China is developing rapidly. As a new type of structure, corrugated steel bridges and culverts are being paid more and more attention in highway construction in China. However, due to the short application time in large quantities in China, the study on the mechanical properties of corrugated steel plate bridges and culverts with different cross-section forms is still in its infancy. Especially, the study on the long-term mechanical behavior of this type of structure applied to different geomorphological and geological conditions is obviously delayed. Therefore, the field test and finite element numerical analysis of the mechanical characteristics of different linear structures and their long-term mechanical properties have important theoretical significance and practical application value. Based on 4 meter diameter circular pipe and 8.1 meter span pipe arch corrugated steel plate bridge and culvert, this paper combines the field long-term monitoring test with finite element numerical calculation. The long-term mechanical behavior of corrugated steel plate bridge culvert with arched section and corrugated steel plate with circular section after the completion of fill construction and its influencing factors are studied. Through the study and analysis of the field measured soil pressure and stress data, it is found that temperature and foundation settlement have great influence on the long-term mechanical performance of corrugated steel plate bridge and culvert, especially on the stress of the structure. Therefore, the effects of temperature and foundation settlement on the stress and earth pressure of corrugated steel plate bridge and culvert with different cross sections are analyzed by establishing a two-dimensional finite element model. The results show that the variation of soil pressure in pipe culverts is mainly affected by the compaction of soil settlement, which is beneficial to the interaction between soil and structure. However, the temperature has a great influence on the long-term measurement data of the grating fiber sensor. After removing the influence of temperature, the stress of each measuring point increases, but the growth is slow, and after a period of time, there is even a tendency to decrease. It is confirmed by the long-term variation trend of earth pressure, which indicates that the long-term mechanical behavior of corrugated steel plate bridges and culverts will gradually develop in a favorable direction to the structure, and the stress characteristics of corrugated steel plate bridges and culverts in different cross-section forms are also different. Compared with the vertical earth pressure, the horizontal earth pressure of the bridge and culvert with the arch section of the pipe has a greater change than that of the vertical earth pressure, and the influence of temperature on the stress in the pipe is more significant than that on the top of the pipe. The influence of temperature on the stress on the top of the pipe is more obvious than that in the pipe, and the corrugated steel plate bridge and culvert have better adaptability to the settlement of the foundation.
【学位授予单位】：北京交通大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：U441

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