本文選題：無(wú)鉸圓拱　切入點(diǎn)：淺拱非線性屈曲理論　出處：《建筑結(jié)構(gòu)》2017年S2期 　論文類型：期刊論文

【摘要】：針對(duì)圓拱結(jié)構(gòu)強(qiáng)度安全與整體穩(wěn)定關(guān)系進(jìn)行了深入研究,基于結(jié)構(gòu)力學(xué)的彈性中心法,得到無(wú)鉸圓拱結(jié)構(gòu)在法向均布荷載下拱冠處和拱端處的應(yīng)力計(jì)算式,并依據(jù)《混凝土結(jié)構(gòu)設(shè)計(jì)規(guī)范》(GB 50010—2010)給出強(qiáng)度安全系數(shù);同時(shí)根據(jù)圓拱結(jié)構(gòu)的經(jīng)典屈曲理論和淺拱非線性屈曲理論,給出了圓拱結(jié)構(gòu)最小臨界屈曲荷載計(jì)算公式,由于結(jié)構(gòu)整體屈曲失穩(wěn)的突變性,參考國(guó)內(nèi)外相關(guān)研究認(rèn)為圓拱結(jié)構(gòu)的屈曲穩(wěn)定系數(shù)需滿足Kcr≥1.5~3.0。根據(jù)圓拱結(jié)構(gòu)強(qiáng)度安全與整體穩(wěn)定的相對(duì)安全系數(shù)關(guān)系,結(jié)合MATLAB計(jì)算軟件,分別對(duì)Kcr=1.5、3.0下,不同混凝土級(jí)別(C35、C50和C65)下圓拱結(jié)構(gòu)強(qiáng)度安全與整體穩(wěn)定臨界情況下的圓拱結(jié)構(gòu)半中心角α和厚徑比T/R的查算關(guān)系曲線族,認(rèn)為混凝土級(jí)別越高,越需要重視圓拱結(jié)構(gòu)整體穩(wěn)定的影響,為工程設(shè)計(jì)人員應(yīng)用提供參考。
[Abstract]:The relationship between strength safety and overall stability of circular arch structure is studied in depth. Based on the elastic center method of structural mechanics, the stress calculation formula of arch crown and arch end under normal uniform load is obtained. According to the Code for Design of concrete structures (GB50010-2010), the strength safety factor is given, and the formula for calculating the minimum critical buckling load of circular arch structures is given according to the classical buckling theory of circular arch structures and the nonlinear buckling theory of shallow arch structures. Because of the sudden change of the buckling instability of the whole structure, it is considered that the buckling stability factor of circular arch structure should meet Kcr 鈮，

本文編號(hào)：1630035