论文部分内容阅读
圬工墩台的頂帽,多采用鋼筋混凝土灌筑。其頂帽尺寸(特別是纵向的寬度)及最小厚度的选择,是从梁跨大小(即支座底鈑尺寸)及梁的游間而定,在有关文献中向无詳細論述。笔者經过学习,提出下述問題进行討論。作为抛砖引玉。一、項帽内部应力分布的假定頂帽的平面尺寸和高度是与承受外部荷載及內部应力分布密切相关的。墩台頂帽的形状分圆端形、尖端形、矩形等。其寬与长相比,寬度方向可視为平面半无限体。根据弹性理論,当一个平面半无限体表面作用集中力P时,以施力点为中心以r为半径画一半圓,在这个半圓周上,第一主向应力的方向将是幅射的。其值: σ_r=(2Pcosθ)/(π_r) (1)式中θ为考虑点与相对竪軸的夹角。
Drilling piers top hat, and more use of reinforced concrete filling. The choice of top hat size (especially longitudinal width) and minimum thickness is based on the beam span size (ie, the size of the support base plate) and the spacing of the beam, as discussed in detail in the relevant literature. After studying, I put forward the following issues for discussion. As a starting point. First, the assumption of internal stress distribution of the cap The planar size and height of the top cap are closely related to the external load and internal stress distribution. The shape of pier top hat round end, tip-shaped, rectangular and so on. Its width and length compared to the width of the plane can be regarded as semi-infinite body. According to the theory of elasticity, when a planar semi-infinite body surface acts as a concentrating force P, a semicircle is drawn with radius r at the point of application and the direction of the first principal stress will be radiated on this half-circle. Its value: σ_r = (2Pcosθ) / (π_r) (1) where θ is the angle between the considered point and the relative vertical axis.