本文選題：強度融合技術(shù)　切入點：恒荷載效應(yīng)　出處：《土木工程學(xué)報》2016年04期 　論文類型：期刊論文

【摘要】：恒荷載效應(yīng)在土木、水利等大型工程結(jié)構(gòu)的分析中往往占有不可忽略的顯著位置。針對傳統(tǒng)彈塑性方法分析恒荷載效應(yīng)顯著結(jié)構(gòu)失效模式存在的失效路徑依賴性問題,結(jié)合截面強度融合技術(shù)和彈性模量調(diào)整策略,提出恒荷載效應(yīng)顯著結(jié)構(gòu)失效元和失效模式的識別方法,進而建立恒荷載效應(yīng)顯著結(jié)構(gòu)損傷演化和失效模式分析的彈性模量縮減法。首先將恒荷載效應(yīng)融入構(gòu)件的截面強度,建立強度和外荷載分布都發(fā)生改變的修正結(jié)構(gòu)計算模型;然后根據(jù)齊次化廣義屈服函數(shù)定義單元承載比和基準(zhǔn)承載比,建立高承載單元識別的自適應(yīng)準(zhǔn)則;進而通過縮減高承載單元的彈性模量來模擬結(jié)構(gòu)的剛度損傷,并確定結(jié)構(gòu)的極限承載力;最后根據(jù)結(jié)構(gòu)進入塑性極限狀態(tài)時高承載單元的彈性模量縮減幅度批量標(biāo)示失效元,據(jù)此確定結(jié)構(gòu)的失效模式。通過算例分析,驗證了該方法具有較強的穩(wěn)定收斂性,能夠取得較高的計算精度和效率,可以更加合理地描述結(jié)構(gòu)的損傷演化過程,具有較強的適用性。
[Abstract]:The constant load effect often occupies a prominent position in the analysis of large engineering structures such as civil engineering and water conservancy. In view of the traditional elastic-plastic method, the failure path dependence of the failure mode of the structure with constant load effect is analyzed. Combined with cross-section strength fusion technique and elastic modulus adjustment strategy, a method for identifying failure elements and failure modes of structures with constant load effect is proposed. Then the elastic modulus reduction method for structural damage evolution and failure mode analysis with constant load effect is established. Firstly, the constant load effect is incorporated into the section strength of the member, and a modified structural model is established, in which both the strength and the external load distribution change. Then, according to the homogeneous generalized yield function, the adaptive criterion for identifying the high bearing element is established, and the stiffness damage of the structure is simulated by reducing the elastic modulus of the high bearing element. The ultimate bearing capacity of the structure is determined, and the failure mode of the structure is determined according to the reduction amplitude of elastic modulus of the high bearing element when the structure enters the plastic limit state, and the failure mode of the structure is determined according to the reduction amplitude of the elastic modulus of the high bearing element. It is proved that the proposed method is stable and convergent, can obtain higher calculation accuracy and efficiency, and can more reasonably describe the damage evolution process of structures.
【作者單位】： 廣西大學(xué)土木建筑工程學(xué)院;廣西大學(xué)工程防災(zāi)與結(jié)構(gòu)安全教育部重點實驗室;廣西壯族自治區(qū)住房和城鄉(xiāng)建設(shè)廳;
【基金】：國家自然科學(xué)基金(51168003,51368006,51478125) 廣西自然科學(xué)基金重大項目(2012GXNSFEA053002)
【分類號】：TU317
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本文編號：1592918