- 摘 要
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周善來 顧 靜
（南京市第二建筑設計院 210002）[提要] 某地下汽車庫內(nèi)兩根柱子斷裂破壞，其余大量柱子及底板開裂?，F(xiàn)場對車庫內(nèi)85個沉降觀測點的觀測結(jié)果表明，車庫周邊基本沒有上浮，中部上浮最大，早現(xiàn)出有規(guī)律的上浮曲面，上浮變形引起的結(jié)構(gòu)附加內(nèi)力使車庫部分柱子及底板開裂。將凈上浮力作為均布面載，車庫作為一個受此荷載作用的周邊簡支的空間空腹桁架進行整體計算，計算撓度與實測上浮的分布規(guī)律吻合，且部分柱子的內(nèi)力計算值已遠遠超過其實際承載能力，達到開裂或破壞狀態(tài)。
[關鍵詞] 抗浮失穩(wěn) 裂縫 地下汽車庫 柱 斷裂破壞Rupture failure of two columns,cracks in bottom slabs and many columns are found in an underground parking garage. The observed results of 85 subsidence points indicate that there is almost no displacement around the garage, the largest upward displacement is at the middle of the garage and a regular curved surface is formed. Huge additional internal forces caused by upward displacement make part of columns and bottom slab crack.ln order to explain this phenomenon, this paper treats the net upward force as a distributed surface loads, and the garage as a space truss with simple supports that suffers such loads. Flexibility of calculation coincides with the measurement, and the calculation forces of some columns exceed far from their resistance capacity and reach to crack or failure statement.
Keywords: contradict float unsteady; crack; underground parking garage; column; destruction
