极端气温下波形钢腹板PC组合箱梁温度效应研究

发布时间：2018-01-10 18:17

本文关键词：极端气温下波形钢腹板PC组合箱梁温度效应研究　出处：《山东大学》2017年硕士论文　论文类型：学位论文

【摘要】：由于新颖的结构形式、独特的受力性能、美观的外在形态,波形钢腹板PC组合箱梁桥近年来得到了广泛的应用。现今的研究主要集中在钢腹板的受力性能上,而较少的关注了温度效应。考虑到桥梁结构受温度影响较大,进行温度效应的研究具有十分重要的现实意义。本文基于宁夏交通厅科技项目,以西咸高速人行天桥及叶盛黄河大桥为工程背景,对波形钢腹板PC组合箱梁的温度效应开展研究,以下为主要工作与成果:1)系统阐述了国内外桥梁温度效应的研究现状,简单全面的介绍了各国规范中对于温度效应的规定。2)以西咸高速人行天桥和叶盛黄河大桥的实测温度为依据,对其温度梯度分布进行分析,并总结了波形钢腹板PC组合箱梁各向温度分布规律。箱梁竖向:对于箱梁高度较小的桥梁,腹板沿竖向无明显温度梯度;对于箱梁高度较高的桥梁,腹板在沿竖向有明显的温度梯度。不管桥梁高度如何,受日照影响,在白天腹板温度均高于顶底板温度,且向阳侧腹板温度高于背阳侧腹板温度。箱梁横向:腹板、底板横向温差均较小,不作特别考虑。对于内衬有混凝土的梁段,混凝土部位的温度低于钢腹板部位的温度,且沿竖向温度分布趋势相似。3)本文对波形钢腹板PC组合箱梁桥的温度场理论进行了分析,并针对叶盛黄河大桥的热力学参数进行了研究。对于重点研究的Ⅰ截面,采用软件MIDAS FEA模拟其二维日照温度场。将模拟结果与实测值对比分析,验证了模型的适用性。4)采用数理统计推算极端气温条件下的大气昼夜温差代表值,进而通过数值模拟得到波形钢腹板的设计温度梯度分布规律,拟合出适用于宁夏地区的波形钢腹板箱梁沿梁高方向的温度梯度。对其进行了力学效应分析,拟合出顶板下表面横向应力的估算公式。
[Abstract]:Due to the structure form of novel, unique mechanical properties, appearance beautiful, web PC composite box girder bridge with corrugated steel has been widely used in recent years. The current study mainly focused on the mechanical properties of steel webs, while less attention. Considering the temperature effect of bridge structure is influenced by temperature, it is very important to study the effect of temperature. In this paper, the traffic department of the Ningxia science and technology project based on high-speed pedestrian bridge and West Xian Ye Sheng the Yellow River bridge, the temperature effect of PC composite box girder with corrugated steel webs to carry out the research, the following is the main work and achievements: 1) describes the present situation of the temperature system the effect of bridges at home and abroad, simple and comprehensive introduction to the provisions for temperature effect codes in.2 high speed) west of Chatham pedestrian bridge and Ye Sheng the Yellow River bridge on the basis of the measured temperature, the temperature gradient Distribution is analyzed, and summarized the PC composite box girder with corrugated steel webs anisotropic temperature distribution. The box girder vertical bridge box girder: for small height, no obvious temperature gradient along the vertical web; for the bridge box girder height higher, with obvious temperature gradient along the vertical bridge. No matter how high, affected by sunshine in the daytime, the temperature was higher than that of the top and bottom temperature of the web, and the web the dayside temperature is higher than the temperature. Downsun side web box girder web plate: transverse temperature difference is smaller, not for special consideration. The beam section is lined with concrete, concrete parts of the steel web site temperature is lower than the temperature, and the vertical temperature the distribution trend of similar.3) theory on the web PC composite box girder bridge with Corrugated Steel's temperature field is analyzed in this paper, and the research on thermodynamic parameters of leaf Sheng the Yellow River bridge. For I focus on the cross section, By using the software MIDAS FEA to simulate the two-dimensional temperature field. The comparative analysis of simulation results and the measured value, verify the applicability of the.4 model) by using the statistical calculation of extreme temperature conditions of atmospheric temperature difference between day and night and representative values were obtained through numerical simulation of corrugated steel web design temperature gradient distribution, temperature gradient waveform fitting steel web box is suitable for Ningxia area high beams along the beam direction. On the mechanics effect analysis, fitting formula of roof surface under transverse stress.

【学位授予单位】：山东大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U448.213;U441.5

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