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周善來(lái)  顧  靜
（南京市第二建筑設(shè)計(jì)院  210002）

[提要]  某地下汽車庫(kù)內(nèi)兩根柱子斷裂破壞，其余大量柱子及底板開(kāi)裂?，F(xiàn)場(chǎng)對(duì)車庫(kù)內(nèi)85個(gè)沉降觀測(cè)點(diǎn)的觀測(cè)結(jié)果表明，車庫(kù)周邊基本沒(méi)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(kù)部分柱子及底板開(kāi)裂。將凈上浮力作為均布面載，車庫(kù)作為一個(gè)受此荷載作用的周邊簡(jiǎn)支的空間空腹桁架進(jìn)行整體計(jì)算，計(jì)算撓度與實(shí)測(cè)上浮的分布規(guī)律吻合，且部分柱子的內(nèi)力計(jì)算值已遠(yuǎn)遠(yuǎn)超過(guò)其實(shí)際承載能力，達(dá)到開(kāi)裂或破壞狀態(tài)。
[關(guān)鍵詞]  抗浮失穩(wěn)  裂縫  地下汽車庫(kù)  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