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 鄒金林    （奧雅納工程顧問(wèn)香港有限公司上海代表處 200021）

[提要]  在闡述結(jié)構(gòu)上的荷載作用和裂縫產(chǎn)生原因的基礎(chǔ)上，結(jié)合一工程事故，分析了溫度、收縮和徐變等變形荷載作用產(chǎn)生裂縫的機(jī)理。根據(jù)工程實(shí)際計(jì)算了變形荷載作用下的內(nèi)力，其結(jié)果與工程事故的情一致。最后提出工程實(shí)踐中進(jìn)行裂縫控制的結(jié)論和建議。
[關(guān)鍵詞]  變形荷載  裂縫控制  伸縮縫  溫度應(yīng)力  收縮應(yīng)力  徐變作用  應(yīng)力松馳

On the basis of theoretical analysis about generation and development of crack on floorboard, its generating mechanism under the action of racking load, such as temperature, shrinkage and creep, is interpreted with a fault case. The internal forces caused by the action of racking load, which is calculated, are the same as the results of the actual measurement. In the end, some conclusions and propositions about the control and design of crack are presented.
Keywords: racking load; crack control; expansion joint; temperature stress; shrinkage stress; creep; stress relaxation