大跨波形钢腹板箱梁桥日照温度场及温差效应研究

发布时间：2019-03-13 12:33

【摘要】：针对目前我国桥涵设计规范未给出波形钢腹板箱梁日照温度梯度,和其温度梯度研究工作的不足。以港珠澳大桥连接线工程某特大跨波形钢腹板连续箱梁桥为研究对象,对其波形钢腹板箱室断面,进行了3 d的日照温度场观测。研究了其日照温度场分布规律,继而提出波形钢腹板箱梁竖向和横向温度梯度数学计算模型,并对温差参数的取值进行了探讨。结合现场实测数据和有限元软件,对比不同温度梯度模式的温差计算值,分析了其温差效应。研究结果表明:实测波形钢腹板箱梁温度场分布与传统箱梁相差较大;温度梯度模式为指数函数和线性函数组成的分段函数;该模式计算得到的竖向及横向温差值与实测结果十分吻合,其他模式与实测结果相差较大;由于温差效应影响,顶板中轴线下缘产生了较大的横向拉应力,设计中应给予关注。该模式可为不同气候条件地区同类桥梁温度荷载计算提供重要参考。
[Abstract]:In view of the lack of sunshine temperature gradient of corrugated steel web box girder in the design code of bridges and culverts in our country at present, the research work on the temperature gradient of corrugated steel web box beam is insufficient. Taking a large span corrugated steel web continuous box girder bridge as an object of study in the connection line project of the Hong Kong-Zhuhai-Macao Bridge, the sunshine temperature field of the corrugated steel bellow box chamber section was observed for 3 days. In this paper, the distribution of sunshine temperature field is studied, and the mathematical models for calculating vertical and transverse temperature gradients of corrugated steel webs are put forward, and the values of temperature difference parameters are discussed. Based on the field measurement data and finite element software, the temperature difference effect of different temperature gradient models is analyzed by comparing the calculated values of temperature difference. The results show that the temperature field distribution of corrugated steel web box girder is different from that of traditional box girder, and the temperature gradient model is a piecewise function composed of exponential function and linear function, and the temperature gradient model is composed of exponential function and linear function. The vertical and transverse temperature difference calculated by the model is in good agreement with the measured results, and other models differ greatly from the measured results. Because of the effect of temperature difference, the lower edge of the roof axis produces a large transverse tensile stress, which should be paid attention to in the design. This model can provide an important reference for the temperature load calculation of similar bridges in different climatic conditions.
【作者单位】：山东大学岩土与结构工程研究中心;中铁十四局集团第二工程有限公司;
【基金】：国家重点基础研究发展计划项目(2010CB732002) 国家自然科学基金项目(51179098,51379113) 高等学校博士学科点专项科研基金项目(20120131110031) 教育部新世纪优秀人才支持计划项目(NCET-12-0339) 山东省自然科学杰出青年基金项目(JQ201313) 山东大学基本科研业务费项目(2014YQ005)
【分类号】：U441.5

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