本文關(guān)鍵詞：網(wǎng)格及弦支網(wǎng)格結(jié)構(gòu)的魯棒性理論與試驗(yàn)研究　出處：《浙江大學(xué)》2015年博士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 網(wǎng)格結(jié)構(gòu) 弦支網(wǎng)格結(jié)構(gòu) H_2/H_∞理論 魯棒性 魯棒性能 魯棒穩(wěn)定性 布索理論 拓?fù)鋬?yōu)化

【摘要】：網(wǎng)格結(jié)構(gòu)與弦支網(wǎng)格結(jié)構(gòu)是空間結(jié)構(gòu)的主要形式,常被作為城市的標(biāo)志性建筑。由于目前設(shè)計(jì)中較少考慮不確定性干擾的影響,尚需通過提高魯棒性來抵抗不相稱破壞�，F(xiàn)有研究中,沒有明確區(qū)分工作狀態(tài)下和極限狀態(tài)下的結(jié)構(gòu)魯棒性,缺乏相應(yīng)的定量評(píng)價(jià)方式和有效的魯棒設(shè)計(jì)方法,且弦支體系的布索方式多在經(jīng)驗(yàn)布置的基礎(chǔ)上進(jìn)行微調(diào),不具有普適性。有必要對(duì)網(wǎng)格結(jié)構(gòu)、弦支網(wǎng)格結(jié)構(gòu)進(jìn)行魯棒性研究,從拓?fù)鋬?yōu)化層次改善結(jié)構(gòu)的性能,同時(shí)還通過合理的布索理論,使得傳力路徑更為直接。本文從結(jié)構(gòu)的魯棒性定量評(píng)價(jià)指標(biāo)、多工況下網(wǎng)格結(jié)構(gòu)的魯棒設(shè)計(jì)、弦支網(wǎng)格結(jié)構(gòu)的魯棒設(shè)計(jì)、弦支網(wǎng)格結(jié)構(gòu)的布索理論、結(jié)構(gòu)模型試驗(yàn)等方面開展研究：對(duì)線性和非線性結(jié)構(gòu)體系,基于系統(tǒng)傳遞函數(shù)的H2范數(shù)、H∞范數(shù),定義結(jié)構(gòu)魯棒性能、魯棒穩(wěn)定性的定量評(píng)價(jià)指標(biāo)IR1、IR2,衡量在結(jié)構(gòu)在工作狀態(tài)、極限狀態(tài)下的魯棒性。對(duì)大爆炸算法進(jìn)行改進(jìn),加速算法收斂速度。提出基于H2/H∞風(fēng)理論的結(jié)構(gòu)魯棒性評(píng)價(jià)方法,對(duì)比分析評(píng)價(jià)指標(biāo)的性質(zhì)、物理意義。通過算例,闡述結(jié)構(gòu)魯棒性能、魯棒穩(wěn)定性與應(yīng)變能、結(jié)構(gòu)屈曲之間的關(guān)系,分析承載力(構(gòu)件截面、約束條件、剛度分布)、意外損傷、關(guān)鍵構(gòu)件等因素對(duì)魯棒性能與魯棒穩(wěn)定性的影響。以結(jié)構(gòu)魯棒性能為優(yōu)化目標(biāo)、魯棒穩(wěn)定性為約束條件,通過考慮多種荷載工況下的連續(xù)體拓?fù)鋬?yōu)化,搜索魯棒性能最佳的結(jié)構(gòu)剛度分布形式,為主要桿件的布置提供參考,實(shí)現(xiàn)多工況下網(wǎng)格結(jié)構(gòu)的魯棒設(shè)計(jì),并通過算例加以驗(yàn)證。通過初應(yīng)變的施加引入初始預(yù)應(yīng)力,提出魯棒構(gòu)型與初始預(yù)應(yīng)力的聯(lián)合優(yōu)化方法,實(shí)現(xiàn)對(duì)弦支網(wǎng)格結(jié)構(gòu)的魯棒設(shè)計(jì)。探討荷載分布、初始預(yù)應(yīng)力、豎桿等因素對(duì)結(jié)構(gòu)魯棒構(gòu)型的影響,并通過算例驗(yàn)證弦支結(jié)構(gòu)魯棒構(gòu)型的合理性�；隰敯粼O(shè)計(jì)給出弦支結(jié)構(gòu)上部網(wǎng)殼的魯棒構(gòu)型,通過Hough變換提取布索位置曲線,并優(yōu)化索端點(diǎn)位置,通過結(jié)構(gòu)的布索理論優(yōu)化出合理的布索方案。以弦支雙曲網(wǎng)殼結(jié)構(gòu)、弦支心形曲面網(wǎng)格結(jié)構(gòu)為例,進(jìn)行布索方案設(shè)計(jì),為實(shí)際工程中的結(jié)構(gòu)布索提供有效途徑。通過對(duì)弦支柱面網(wǎng)殼、弦支球面網(wǎng)殼的布索設(shè)計(jì),驗(yàn)證張弦梁、弦支穹頂結(jié)構(gòu)布索方案的合理性。分別按照魯棒設(shè)計(jì)和常規(guī)設(shè)計(jì)制作兩個(gè)雙曲網(wǎng)殼結(jié)構(gòu)模型,通過模擬動(dòng)力沖擊和靜力超載兩種干擾場(chǎng)景,觀測(cè)結(jié)構(gòu)的位移響應(yīng)和失效場(chǎng)景,對(duì)比兩個(gè)模型的魯棒性能、魯棒穩(wěn)定性,驗(yàn)證基于魯棒構(gòu)型設(shè)計(jì)的弦支結(jié)構(gòu),具有更好的魯棒性。
[Abstract]:Grid structure and chord-supported grid structure are the main forms of spatial structure and are often used as the iconic buildings of the city. In the present research, there is no clear distinction between the structure robustness under the working state and the limit state, the corresponding quantitative evaluation method and the effective robust design method are lacking. The cable arrangement of chord branch system is mostly fine-tuned on the basis of experience arrangement, which is not universal. It is necessary to study the robustness of grid structure and chord branch grid structure to improve the performance of the structure from the topology optimization level. At the same time, through the rational cabling theory, the force transfer path is more direct. In this paper, the robust evaluation index of the structure, the robust design of the grid structure under multiple working conditions and the robust design of the chord-supported grid structure are presented in this paper. The cabling theory of chord-supported grid structure and structural model test are studied. For linear and nonlinear structural systems, the H _ 2 norm and H _ 鈭，

本文編號(hào)：1420068