- 摘 要
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(浙江大學(xué)空間結(jié)構(gòu)研究中心 杭州 310027)
【提要】 在大跨度干煤棚工程設(shè)計中采用的弦弓式預(yù)應(yīng)力柱面網(wǎng)殼結(jié)構(gòu)是由網(wǎng)殼和預(yù)應(yīng)力拉索組成的雜交體系。采用非線性有限元方法研究了這種結(jié)構(gòu)的穩(wěn)定性，分析了各種荷載工況、初始缺陷和拉索預(yù)應(yīng)力對結(jié)構(gòu)穩(wěn)定性的影響。分析了預(yù)應(yīng)力對結(jié)構(gòu)自振特性的影響，然后采用振型分解反應(yīng)譜法對結(jié)構(gòu)的水平及豎向地震反應(yīng)進行了研究，總結(jié)了結(jié)構(gòu)地震內(nèi)力系數(shù)分布規(guī)律。研究表明，布置拉索對結(jié)構(gòu)的穩(wěn)定性能改善明顯，結(jié)構(gòu)的極限荷載提高30％以上，施加的預(yù)應(yīng)力對結(jié)構(gòu)的動力性能影響不大。
【關(guān)鍵詞】 預(yù)應(yīng)力網(wǎng)殼 穩(wěn)定性分析 動力特性 抗震性能
Analysis of Stability and Dynamic Characteristic of Stringbow Prestressed Cylindrical Latticed Shell/Luo Yaozhi,Sun Xuguang(Research Center of Spatial Structure,Zhejiang University,Hangzhou 310027,China)
Abstract:The stringbow prestressed cylindrical latticed shell,which is a hybrid structure composing of cable and latticed shell, has been used to design longspan coal storage.The stability of structure is studied by nonlinear finite element method,and the effects of load case, initial defect, prestress on stability are also discussed.Meanwhile, the natural vibration characteristics and effects of prestress of structure are studied.Then,the vertical and horizontal seismic responses are studied by response spectrum method,and the distribution of seismic force coefficient is summarized.The results show that the cable improves the stability obviously,but it does not work to the dynamic characteristic basically.
Keywords:prestressed latticed shell;stability analysis;dynamic characteristic;seismic response
*國家自然科學(xué)基金項目50378083。
