【作者】 张雷；

【导师】 夏红兵；

【作者基本信息】 安徽理工大学 ， 结构工程， 2014， 硕士

【摘要】 目前钢管混凝土可缩性支架仍沿用U型钢可缩性支架的接头方式,致使钢管混凝土支架优良承载性能得不到发挥、总体承载能力不高。现提出一种沥青胶砂可缩性接头,接头样式为用两个半圆形的法兰对接形成一个内壁为圆形的套管,在法兰上开一定尺寸的小孔,在管内充填沥青胶砂材料。首先,需找出一种沥青胶砂配合比,并在该沥青胶砂材料浇筑在接头钢管充填该配合比沥青胶砂材料,在额定工作荷载作用下,接头承受外荷载导致接头受压收缩,且位于接头钢管上的开孔开始向外排出沥青胶砂材料。并对沥青胶砂材料配比、接头承载性能、接头钢管开孔面积等问题开展研究。在研究过程中通过配比试验,探讨乳化沥青、水泥添加量以及砂子粒径对接头抗压强度的影响,从而得到满足要求的浆体配合比；通过接头轴向加载实验,测得接头钢管开孔开始排出浆体时的轴向载荷,为可缩性支架滑动阻力设计提供依据；改变开孔面积,通过接头轴向荷载与开孔面积之间的关系,探讨开孔面积对轴向承载力的影响；通过理论分析,探讨可缩性接头在受压收缩后对钢管混凝土可缩性支架承载性能的影响。更多还原

【Abstract】 Up to now, the joint for the reducible support made of U-steel has still been used for the steel tube concrete support. Consequently, the bearing capacity for the steeltubeconcrete support cannot be brought into full play and the total bearing capacity is not desirable.First, to solve the problem, a reducible joint made of still tube filled with cement-asphalt mortar is proposed. For the earliest possible application of the joint, a suitable mixture ratio should be deduced and in accordance to the ratio, the mortar can be mixed with appropriately proportions of cement, asphalt and sand to fill the still tube. Then affected by the rated working resistance, the mortar mixture will be emitted through spores out of the surface of the steel tube. To obtain such desirable performances, investigations should be made into the optimal mixture ratio of the mortar, the optimal bearing capacity of the joint and the optimal area of the spore through the surface of the joint tube. In this aspect, the preliminary experiments have been conducted to investigate the impacts on the compression strength and the deformation by the quantity of emulsified asphalt, the quantity of cement and the diameter of the sand grain so that a satisfactory mortar can be mixed up.Through experiments with the compressibility of the joint, the axial stress at the time for mortar to emit through the spores out of the surface of the tube could be determined and serve as a parameter for designing the sliding resistance for the reducible support. Through experiments with the compressibility of the joint, the axial stress as a function of the area of the spore can be deduced by changing the area of the spore. Along this line, the area of the spore can be optimized. Through theoretical analysis, this paper discusses yielding joint after compressive shrinkage on the bearing performance of the concrete-filled steel tube compressible support effect.更多还原