開孔之正方形版受均佈載重時之分析

Abstract

本文主要在以有限元素法分析方式探討開孔之鋼筋混凝土正方形版受均佈載重時，對其破壞載重、撓度及降伏線之影響。在分析上，討論開孔之大小、位置、形狀、支承端型式對鋼筋混凝土版產生之影響，並分析在雙開孔行為下，是否可視作單一大開孔來設計。由分析結果顯示，開孔之大小有一最小破壞載重及最大彈性撓度的臨界值，且開孔之位置及形狀皆會對其降伏線產生影響。而在雙開孔之行為上，可以視作一中央大開孔來簡化設計。

The thesis was conducted to study the failure loads, displacement and yielding line patterns of square reinforced concrete slab with openings. The slab is subjected to an uniform load. The influences of changing the size of openings, the location of opening and bearing type were investigated. Furthermore, the difference between two openings and one big opening with total area of the two openings is also investigated. From the result of the investigations, several conclusions can be made as follows. (1) The size of opening affects the failure load and displacement. (2) There is a critical size of opening which makes failure load minimum and displacement maximum. (3) If the location of opening moves from center to corner of the plate, failure load will increase and displacement will decrease. (4) Two openings can be simplified into one big opening with equal area.