论文部分内容阅读
以轴力和锚栓数量及其布置形式为参数,对4个外露式钢柱脚试件进行了水平往复加载试验,对其受剪性能及受剪机制进行分析。当柱脚所受轴力为压力时,柱脚的剪力由其与基础顶面间的静摩擦力传递给基础,且柱脚弯矩对其受剪承载力有提高作用。当柱脚所受轴力为拉力时,柱脚底板与基础表面间分离,柱脚在水平荷载作用下发生滑移,此时锚栓参与承担水平力,但其承担水平力的能力较小。柱脚受弯承载力随着柱脚锚栓数量的增加而增大。当锚栓数量从4个增加到6个时,柱脚受弯承载力增加了12%,耗能能力增加了20%。配置相同数量锚栓柱脚的滞回行为随着锚栓布置方式的不同也有所改变。将锚栓布置在沿加载方向的最外侧时,可以最大程度地利用每个锚栓的承载力。因此,在设计外露式柱脚时需要考虑锚栓布置方式,以便充分利用锚栓的受拉性能。
Taking the axial force and the number of anchors and their layout as the parameters, four specimens of exposed steel columns were subjected to horizontal reciprocating loading tests, and the shear performance and shear mechanism were analyzed. When the axial force of the column foot is pressure, the shear force of the column foot is transmitted to the foundation by the static friction force between the column foot and the top surface of the foundation, and the bending moment of the column foot enhances the shear capacity of the column foot. When the axial force of the column foot is tensile force, the bottom of the column foot separates from the base surface, and the column foot slips under the horizontal load. At this moment, the anchor bolt participates in the horizontal force, but its ability to bear the horizontal force is small. The flexural bearing capacity of column foot increases with the number of anchor bolt. When the number of anchor bolts increased from 4 to 6, the flexural bearing capacity of column foot increased by 12% and the energy dissipation capacity increased by 20%. Hysteresis behavior for configuring the same number of anchor studs varies with the way the anchor is laid. When the anchor bolt is arranged on the outermost side in the loading direction, the bearing capacity of each anchor bolt can be utilized to the maximum. Therefore, the design of exposed columns need to consider the anchor arrangement, in order to take full advantage of the tensile properties of the anchor.