本文關鍵詞： 張拉成形曲面 廣義Maxwell模型 PVC膜材 黏彈性 模型 應力松弛　出處：《建筑結(jié)構(gòu)學報》2015年05期 　論文類型：期刊論文

【摘要】：對膜結(jié)構(gòu)施工中由裁剪片拼接張拉形成的膜面進行應力松弛分析,考察膜面應力隨時間逐漸減小的變化規(guī)律�？紤]膜材材料和幾何雙重非線性,采用廣義Maxwell黏彈性模型建立積分型本構(gòu)方程,推導增量本構(gòu)方程,編制非線性有限元程序?qū)崿F(xiàn)成形曲面的應力松弛數(shù)值分析過程。對聚氯乙烯(PVC)膜材進行了不同初始應力水平下的單軸應力松弛試驗和不同應力比下的雙軸應力松弛試驗,用5單元的廣義Maxwell黏彈性模型對試驗數(shù)據(jù)擬合,確定了膜材本構(gòu)方程的黏彈性參數(shù)。進行十字形膜片的加載及應力松弛試驗,對其試驗過程進行數(shù)值分析,結(jié)果表明試驗結(jié)果與數(shù)值分析結(jié)果基本一致,驗證了成形曲面黏彈性數(shù)值分析方法的可行性。對PVC膜材馬鞍形曲面算例進行黏彈性分析,結(jié)果表明,馬鞍形曲面在張拉完成4 d后,膜面平均應力降低了44%。
[Abstract]:The stress relaxation analysis of the membrane surface formed by the splicing tensioning of the cutting pieces in the construction of membrane structure is carried out, and the variation law of the membrane surface stress gradually decreasing with time is investigated. The material and geometric nonlinearity of the membrane material are considered. The integral constitutive equation is established by using the generalized Maxwell viscoelastic model and the incremental constitutive equation is derived. Development of nonlinear finite element program for numerical analysis of stress relaxation of forming surface. Uniaxial stress relaxation tests with different initial stress levels and biaxial stress relaxation tests with different stress ratios were carried out. The viscoelastic parameters of the constitutive equation of the membrane were determined by fitting the test data with the generalized Maxwell viscoelastic model of 5 elements. The loading and stress relaxation tests of the cross-shaped diaphragm were carried out. The numerical results show that the experimental results are in good agreement with the numerical results. The feasibility of viscoelastic numerical analysis method for forming surface is verified. The viscoelastic analysis of saddle curved surface of PVC membrane is carried out. The results show that the saddle curved surface is completed 4 days after tension. The average stress of the film surface is reduced by 44%.
【作者單位】： 魯東大學土木工程學院;同濟大學建筑工程系;
【基金】：國家自然科學基金項目(50778129) 魯東大學博士科研啟動基金項目(LY2014029)
【分類號】：TU38
【正文快照】： 0引言膜結(jié)構(gòu)通過對膜材和索施加預張力使之具有剛度從而抵抗外荷載作用,結(jié)構(gòu)的剛度由其幾何形狀和張拉預應力決定。施工中,將裁剪分析得到的平面膜片拼接張拉到固定邊界形成平衡曲面,該曲面稱為成形曲面。由于膜材的黏彈特性,導致成形曲面的膜面張力因應力松弛而降低,影響結(jié)構(gòu)

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