论文部分内容阅读
为开展单箱三室箱梁剪力滞效应的试验研究,制作了有机玻璃简支箱梁模型,对试验模型进行了分级加载。对该试验箱梁进行集中加载,分别作用于跨中截面四腹板上方、两对称边腹板上方和两对称中腹板上方。采用DH3816应变采集仪测得跨中及四分之一跨截面各关键点应变值,用百分表测得箱梁各关键截面挠度值。测量得到的截面应力分布规律验证了箱梁截面剪力滞效应的存在。对该有机玻璃简支箱梁,利用有限元方法和模型试验方法,研究了3种集中力工况下截面的剪力滞分布规律。结果表明,集中力作用下单箱三室箱梁各翼板间存在明显的剪力滞效应,且荷载的横向作用位置对箱梁截面剪力滞效应影响较大。
In order to carry out the experimental research on shear lag effect of box girder with single box and triple box girder, the model of plexiglass box girder with simple box girder was made, and the test model was graded and loaded. The test beam is concentrated load, acting on the cross-section above the four webs, two symmetrical webs above and two symmetrical webs above. Using DH3816 strain gauge to measure the mid-span and quarter-span cross-section of the key points of strain values, measured with a dial indicator of the critical cross-section box girder deflection. The measured stress distribution of cross-section verified the existence of shear lag effect on the box girder section. Using the finite element method and the model test method, the shear lag distribution under three kinds of concentrated conditions is studied. The results show that there is a significant shear lag effect between the flanges of the single box and the three-chamber box girder under the action of concentrated force, and the lateral position of the load has a significant influence on the shear lag effect of the box girder section.