【摘要】：當(dāng)橢球形弦支穹頂結(jié)構(gòu)的同圈環(huán)索內(nèi)力相等時(shí),張拉環(huán)索是一種高效的預(yù)應(yīng)力施加方式。該文利用平衡矩陣?yán)碚摲治隽?種常見(jiàn)橢球形弦支穹頂索撐體系的可行預(yù)應(yīng)力模態(tài),發(fā)現(xiàn)了當(dāng)索撐體系的超靜定次數(shù)不小于環(huán)索單元數(shù)時(shí)同圈環(huán)索內(nèi)力可相等的規(guī)律。然而相比聯(lián)方型和凱威特型橢球索撐體系,肋環(huán)型索撐體系的超靜定次數(shù)低,同圈環(huán)索內(nèi)力不能相等,導(dǎo)致不能直接采用張拉環(huán)索方式施加預(yù)應(yīng)力。為使肋環(huán)型橢球弦支穹頂?shù)耐Νh(huán)索內(nèi)力相等,采用擴(kuò)展力密度法對(duì)其索撐體系重新找形分析,得到了同圈環(huán)索內(nèi)力相等的改進(jìn)肋環(huán)型橢球索撐體系。最后對(duì)一肋環(huán)型橢球弦支穹頂算例進(jìn)行了找形分析驗(yàn)證,并利用ANSYS有限元軟件對(duì)傳統(tǒng)型和改進(jìn)型肋環(huán)橢球弦支穹頂進(jìn)行了力學(xué)性能的對(duì)比分析,提出了張拉環(huán)索施工時(shí)將張拉點(diǎn)布置在長(zhǎng)軸方向下方的建議,這為以后類(lèi)似工程的施工設(shè)計(jì)提供了參考依據(jù)。
[Abstract]:When the internal forces of the same loop cable of the ellipsoidal chord dome are equal, the tensioning cable is an efficient way to apply the prestressing force. Based on the equilibrium matrix theory, the feasible prestressing modes of three common ellipsoidal domes are analyzed in this paper. It is found that the internal forces of the same loop cable can be equal when the number of statically indeterminate elements is not less than the number of cable elements. However, compared with the ellipsoidal bracing system of the combined square type and the Kewett type, the rib-ring cable bracing system has a lower number of statically indeterminate times, and the internal force of the same loop cable is not equal, which leads to the failure to apply the prestress directly by the tensioning cable method. In order to make the internal force of the same ring cable of the rib ring ellipsoid dome equal, the extended force density method is used to reform the cable bracing system, and an improved rib ring type ellipsoid cable bracing system with equal internal force of the same ring cable is obtained. Finally, the form-finding analysis of an ellipsoidal dome with one rib ring is carried out, and the mechanical properties of the traditional and the improved ellipsoidal dome are compared and analyzed by using the ANSYS finite element software. This paper puts forward the suggestion that the tension points should be arranged below the long axis during the construction of the tension cables, which provides a reference basis for the construction design of similar projects in the future.
【作者單位】： 天津大學(xué)水利工程仿真與安全國(guó)家重點(diǎn)實(shí)驗(yàn)室;天津大學(xué)建筑工程學(xué)院;
【基金】：天津大學(xué)自主創(chuàng)新基金項(xiàng)目(1304)
【分類(lèi)號(hào)】：TU399

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本文編號(hào)：2143615