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      超高層鋼板剪力牆控制變形的措施

      超高層鋼板剪力牆控制變形的措施钢板剪力墙结构自重非常轻,可减小地震作用,同时降低基础费用;适用于基础承载力不能提高的加固结构中;与超高層鋼板剪力牆控制變形的措施钢板剪力墙结构自重非常轻,可减小地震作用,同时降低基础费用;适用于基础承载力不能提高的加固结构中;与钢筋混凝土剪力墙相比,钢板剪力墙最突出的优点是在很大程度上降低了结构自重。如此,可以减小了地震时的不利作用,如减小结构底部的倾覆力矩,减小重力荷载代表值;占用建筑面积小,能提供更大的建筑使用空间。但钢板剪力墙存在面积较大,大部分均超过运输宽度,焊接易变形等缺点。

      在項目初期,通過鋼結構的結構設計和深化設計的過程管控,采用合理的科學的設計,則會大大的降低施工和制作難度,將焊接變形有效降低。鋼結構由于本身固有的屬性,有著成材後不易修複的特點。如果鋼材料在設計過程中就存在不足和缺陷,那麽焊接變形便會不可避免。而這時的誤差只能依靠人工修複。故而在設計階段提出以下管控措施:

      a)焊縫位置應避開高應力區:焊縫區的應力越大,則鋼結構越容易産生焊接變形及焊縫裂紋;

      b)焊縫位置應對稱于構件截面的中性軸:焊縫位置盡可能對稱于構件截面的中性軸,或者盡量靠近中性軸,這對減少梁、柱等一類鋼結構的撓曲變形有良好的效果;

      c)盡量減少焊縫的數量、尺寸:鋼結構中焊縫數量越多、尺寸越大,焊接熱源對結構的熱輸入就越大,産生的焊接變形也就越大。

      d)對于鋼板剪力牆本體板較厚的情況,可通過結構設計的核算,將鋼板牆與鋼柱的現場焊縫的焊縫形式稍作修改,將單邊剖口焊縫,改爲K型剖口焊縫。

      e)鋼板牆之間的對接可采用栓接,避免在跨中大面積剖口焊(鋼板牆本體一般都較厚),現場焊接難度大,易産生焊接變形,故而直接改栓接

      通過對鋼板剪力牆焊接變形的相關研究,我們可發現,此類型問題,能否得以規避,有賴于對其多項影響環節的充分掌控,而且應當接合項目的實際情況,采用不同的優化措施,接合多個項目的實踐,無論是板剪力牆的加工制造,還是項目現場安裝,面對焊接變形的問題,目前都有比較系統的解決方案,本文作爲解決此類問題的總結,希望對鋼板牆的制作安裝,能夠有效的提高精度。萬丈高樓平地起,無論任何建築都需要堅實的基礎,只有將每一項構造都更加精確的完成,尤其是超高層此類浩大的工程,才能在施工建設時能夠獲得更高的質量。

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      It is perhaps hardly necessary to state that Mrs Keeling on the eve of the ceremony for the opening of the Keeling wing had subscribed to a press cutting agency which would furnish her with innumerable accounts of all she knew so well. But print was an even more substantial joy than memory, and there appeared in the local press the most gratifying panegyrics on her husband. These were delightful enough, but most of all she loved the account of herself at that monumental moment when she presented the Princess with the bouquet of daffodils and gypsophila. She was never tired of the perusal of this, nor of the snapshot which some fortunate photographer had taken of her in the very middle of her royal curtsey, as she was actually handing the bouquet. This was reproduced several times: she framed one copy and kept all the rest, with the exception of one with regard to which she screwed herself up to the point of generosity that was necessary before she could prevail on herself to send it to her mother. They did not get far from Odiwara before it was necessary to leave the jin-riki-shas and take to the cangos. These were found waiting for them where the road ended and the footpath began, and the boys were delighted at the change from the one mode of conveyance to the other. Doctor Bronson did not seem to share their enthusiasm, as he had been in a cango before and did not care for additional experience. He said that cango travelling was very much like eating crow—a man might do it if he tried, but he was not very likely to "hanker after it." XLVI THE DANCE AT GILMER'S did I, that Amasai and Carrie got married last May? They are still dry and the roads are dusty. It hasn't rained for weeks and weeks. At our feet were the two walls, the outer wall enclosing the palace, the gardens, the arena, where fights were given between elephants and tigers; the inner wall, ten metres high, built round the zenana—the women's palace—of which even the foundations have almost disappeared under the overwhelming vegetation. "Always, you might say. Father took me there as a child during the mine excitement, growed up there, went into business, married, lost my wife, and married again. We're now on what you might call our bridal tower. I had to come down here on business, so I brung my wife along, and worked it off on her as our bridal tower. Purty cute, don't you think?" "Wot about this gal he's married?" "And thus they could serve the Lord's anointed!" said Turner, compassionately, as he looked on the livid and swollen face and trembling limbs of him, whom he had ever, till now, seen with the beauty of holiness giving dignity to his fine countenance, and with the vigour of manhood exhibited in every motion of his muscular form. "Hark!" added the smith, starting—"there is a scuffle outside! Tom Merritt will have enough of them." For an instant he paused, and then, snatching up one of the cords that had tied the monk, he severed it with his axe from the ring in the wall, and passing one end round the monk's arm, fastened the other round his own waist. "Now you will have no trouble in holding by me—keep close. Here, father, could you not hold this? it might keep off some scurvy knave," drawing a sharp wood-knife from his belt, and placing it in the monk's tremulous hand. Turner then ordering the few who were with him to cover the retreat, to keep compact as they followed, and to strike at all within reach, with a keen-edged battle-axe in his right hand, and a formidable club, pointed with steel and firmly bound with iron, in his left, he hurried from the dungeon.HoME蝴蝶网都市激情小说ENTER NUMBET 008anmosna.com.cn
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