- 摘 要
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(1 中冶集團建筑研究總院 北京 100088；2 寶山鋼鐵股份有限公司設(shè)備部 上海 201900)
［提要］某依附于平臺框架的分離式柱承受最大為450/80t重級工作制吊車荷載的作用，建成使用不到20年，有多根柱子在柱頭處出現(xiàn)裂縫。現(xiàn)場應(yīng)力測量和結(jié)構(gòu)整體的計算分析表明，由于構(gòu)造不合理，裂縫處存在較高的壓應(yīng)力和初始拉應(yīng)力。在吊車荷載反復(fù)作用下，疲勞強度不足，因而出現(xiàn)疲勞破壞?？紤]到出現(xiàn)裂縫后，初始應(yīng)力會得到一定程度的釋放，提出了簡單的局部加固方案，并付諸實施。
［關(guān)鍵詞］ 分離式柱 疲勞 吊車荷載 應(yīng)力測量 加固
Fatigue Failure of Separate Steel Columns in a Working Platform Frame/Yang Jianping１，Chang Haosong1,Xing Kuntao1,Tong Xiaoli1,Cheng Haibo2,Wang Fa 2,Zhou Youhuai 2
(1 National Diagnosis and Rehabilitation of Industrial Building Research Center,Beijing 100088,China; 2 Equipment Department,Baoshan Iron & Steel Co.，Ltd.,Shanghai 201900,China)
Abstract:Separate columns braced by working platform frame are subjected to loading of heavy working cranes up to 450/80t. Within 20 years since they were built up, cracks were found at the top of the columns. Stress measurement and structure analyses show that there were high compression stress and initial tension stress at the the top of the columns because of inappropriate construction design. Under the repeated loading of the cranes, the fatigue strength of the columns is insufficient, and fatigue failures occurred. Considering that the initial stress could be released with the cracks initiation, a local strengthening measure is presented and it has been executed.
Keywords:separate column； fatigue； crane loading； stress measurement； strengthening
