隔板式曲线组合梁施工阶段开口薄壁钢梁受力特性研究

发布时间：2018-05-20 12:27

本文选题：曲线组合梁 + 开口薄壁钢梁　；参考：《铁道学报》2014年09期

【摘要】：在无支架施工中,隔板式曲线组合梁的承载结构为曲线开口薄壁钢梁。以横隔板数量N及跨度与曲线半径的比值(跨径比)为参数,对5片试验梁进行混凝土浇筑过程中的模型试验,并基于M/r法,采用ANSYS软件分析曲线开口薄壁钢梁在混凝土湿重作用下的受力特性。结果表明:在混凝土湿重作用下,曲线开口薄壁钢梁的竖向位移、径向位移、切向应力及翘曲正应力与弯曲正应力的比值(应力比)均随均随跨径比的增大线性增加,随横隔板数量N的增加非线性减小,N从0块增加到3块的过程中变化较大,之后变化较小;端横隔板和跨中横隔板对曲线钢梁的弯扭效应影响最大;跨径比是反映曲梁受扭程度的一种显性指标,应根据应力比限值考虑跨径比的大小来确定曲线开口钢梁的横隔板。
[Abstract]:In the construction without support, the bearing structure of diaphragm curved composite beam is curved open thin wall steel beam. Taking the number N of transverse diaphragm and the ratio of span to curve radius (span ratio) as parameters, the model test of five test beams during concrete pouring is carried out, and the model test is based on the method of M / r. The stress characteristics of curved thin-walled steel beams under the action of concrete wet weight were analyzed by ANSYS software. The results show that the vertical displacement, radial displacement, tangential stress and the ratio of warping normal stress to bending normal stress (stress ratio) of curved thin-walled steel beams increase linearly with the increase of span ratio under the action of wet concrete. With the increase of the number of transverse diaphragm N, the nonlinear decrease of N is larger in the process of increasing from 0 to 3, and then the change is small, the effect of end transverse partition and span transverse partition on the bending and torsion effect of curved steel beams is the greatest. The span ratio is a dominant index to reflect the torsion degree of curved beam. The transverse diaphragm of curved open steel beam should be determined according to the limit value of stress ratio and the size of span ratio.
【作者单位】：石家庄铁道大学土木工程学院;石家庄铁道大学道路与铁道工程安全保障省部共建教育部重点实验室;
【基金】：国家自然科学基金(51108281) 河北省自然科学基金(E2014210038) 河北省高等学校科学技术研究项目(ZD2014025) 中国博士后科学基金(2014M560088)
【分类号】：U448.216;U441

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