CAJ | 학술논문

针对横向大悬臂连续箱梁异形结构横向开裂问题,根据相似原理,制作横向大悬臂连续箱梁缩尺模型,采用非线性增量的分析方法,建立横向大悬臂连续箱梁模型桥的非线性有限元修正模型.计算了横向大悬臂箱梁模型桥在等级加载过程中应变及挠度横向分布分布状况,与试验结果做了比较.研究表明:随着荷载等级的提高,横向大悬臂连续箱梁模型桥跨中腹板上缘压应变在横向呈明显的不均匀分布,在加载位置压应变值大,靠近横桥向截面中线处应变值较小;加载等级提至400 kN时,大悬臂横梁端挠度远大于大悬臂相对侧横梁端挠度,中跨跨中挠度在横桥向的分布状况与腹板上缘压应变保持相同的规律;模型桥双向受力,荷载局部效应明显.
침대횡향대현비련속상량이형결구횡향개렬문제,근거상사원리,제작횡향대현비련속상량축척모형,채용비선성증량적분석방법,건립횡향대현비련속상량모형교적비선성유한원수정모형.계산료횡향대현비상량모형교재등급가재과정중응변급뇨도횡향분포분포상황,여시험결과주료비교.연구표명:수착하재등급적제고,횡향대현비련속상량모형교과중복판상연압응변재횡향정명현적불균균분포,재가재위치압응변치대,고근횡교향절면중선처응변치교소;가재등급제지400 kN시,대현비횡량단뇨도원대우대현비상대측횡량단뇨도,중과과중뇨도재횡교향적분포상황여복판상연압응변보지상동적규률;모형교쌍향수력,하재국부효응명현.
In order to solve the problem of transverse cracking on box girder with long cantilever and based on similarity principle, model bridge with long transverse cantilever was firstly made and mode test was done. Nonlinear analysis method was applied in numeric analysis, and the nonlinear FEM model for bridge with long transverse cantilever was updated.The distribution of strains and deflection was analyzed under various loading grade, and compared with test results.The studies show that, along with the increase of load, the compressive strain at top area of web is obviously non-uniform in transverse direction. Compressive strain at loading area is larger than that at centerline of cross-section; while the load comes to a level, deflection at end of long cantilever is far larger than that at opposite point, and the transverse distribution of deflection is similar to that of strains at middle of mid-span.Model bridge is in bi-directional stress status with obvious loading effect at local area.