freepeople性欧美熟妇, 色戒完整版无删减158分钟hd, 无码精品国产vα在线观看DVD, 丰满少妇伦精品无码专区在线观看,艾栗栗与纹身男宾馆3p50分钟,国产AV片在线观看,黑人与美女高潮,18岁女RAPPERDISSSUBS,国产手机在机看影片

正文內(nèi)容

鋼-混凝土蜂窩組合梁抗剪性能研究畢業(yè)論文-展示頁

2024-09-07 19:25本頁面
  

【正文】 beam honeyb is formed by bining the main beams with bridge deck fully exert the advantages of the both materials. Over the past decades, the application of cellular steel structure has been changed from the single use of cellular beam and cellular column to various forms, such as the beamcolumn connections of cellular steel frame, cellular steel frame, cellular posite structure and so on. the cellular structure has been applied in the United States, Japan and some European countries, and the calculation method of cellular beam and steelconcrete posite beam is simply established in the appropriate specifications, but the corresponding calculation method is not accurate with some certain deviation. So far, there are no design specifications of the cellular beam and cellular posite beam in China, so the extensive and deep research and study on the cellular beam and steelconcrete posite cellular beam should be done in order to satisfy the needs of gradually increasing engineering applications and provide reference for the establishment of the corresponding design specifications. In this paper, study on shear strength and mechanical performance under bending .The shear force of cellular beam and steelconcrete posite cellular beam is conducted from following aspects: It theory the overseas related specifications, procedures and the domestic relevant design method provisions on the shear strength calculation method about cellular beam and posite cellular beams are analyzed and discussed, and their advantages and deficiencies are paratively analyzed to determine the research content of the paper. Based on the foreign scholars’ shear experiments’ researches of the cellular beam and posite cellular beam, numerical analysis is conducted with the finite element program, a calculation model of the cellular beam and steelconcrete posite beam is built. The analysis results are pared with the test results about the bearing capacity and curve, the established finite element model on the shear strength calculation is effective. The influence of hole shape, hole size, flange size and such parameters of , and cellular beam on shear strength parameters has been analyzed, the shear strength calculation of the cellular beam has been established by analyzing the shear strength of cellular beam with different parameters which provides reference for engineering applications. The differences between cellular beam and steel concrete posite cellular beams have been analyzed, and study on the influence of concrete slabs on shear strength of cellular beam has been done. By calculating posite cellular beams’ shear strength with different concrete slab sizes and different connection degrees and bining theoretical analysis with numerical fitting method, a shear strength calculation method of the steelconcrete posite cellular beams is given considering the function of concrete slabs and the effect of the connection degree. By analyzing the mechanical performance of the steelconcrete posite cellular beams under the joint force of bending and shearing the related formula of posite cellular beams is established to instruct the design. a new form under more reasonable force is put forward by heightening the position of the vertical position of the holes in posite cellular beams. Key words: Cellular beam。 通過對鋼 混凝土蜂窩組合梁在彎矩和剪力共同作用下的受力性能分析,建立了蜂窩組合梁彎 剪相關(guān)公式,為設(shè)計做指導(dǎo);通過改變蜂窩組合梁孔洞豎向位置,提出受力更加合理的蜂窩組合梁新形式。 對比蜂窩梁和鋼 混凝土蜂窩組合梁工作性能,分析混凝土板對蜂窩梁抗剪承載力的影響。 以已有的蜂窩梁和蜂窩組合梁抗剪實驗研究為基礎(chǔ),利用有限元軟件建立蜂窩梁和鋼 混凝土蜂窩組合梁計算模型,通過承載力和荷載 .位移曲線對比,驗證了本文建立的有限元模型對蜂窩梁和蜂窩組合梁抗剪計算的有效性。我國現(xiàn)在尚無蜂窩梁與蜂窩組合梁的設(shè)計規(guī)范,為滿足逐漸增多的工程需要,和為相應(yīng)規(guī)范的推出提供參考,應(yīng)對蜂窩梁及鋼 混凝土蜂窩組合梁進行廣泛和深入的研究。 近幾十年來,蜂窩鋼結(jié)構(gòu)從蜂窩梁、蜂窩柱單獨使用向蜂窩梁 柱節(jié)點、蜂窩框架和蜂窩組合結(jié)構(gòu)等多種形式轉(zhuǎn)變。鋼 混凝土蜂窩組合梁抗剪性能研究 摘 要 : 蜂窩梁是 H 型鋼或工字型鋼腹板沿折線切割后錯位焊接所形成的一種鋼結(jié)構(gòu)構(gòu)件形式。蜂窩梁具有抗彎承載力高,利用孔洞穿越管道可以降低層高,具有較好的力學(xué)、美學(xué)和經(jīng)濟效益等優(yōu)點,在建筑結(jié)構(gòu)中通過栓釘把鋼梁和混凝土樓板連接形成組合樓板,在橋梁中將主梁與橋面板連接形成鋼 混凝土蜂窩組合梁,可以充分發(fā)揮鋼梁與混凝土兩種材料的優(yōu)點。蜂窩結(jié)構(gòu)在美國、日本以及歐洲一些國家的高層建筑 ,工業(yè)廠房中應(yīng)用較多,并將蜂窩梁和鋼 混凝土蜂窩組合梁簡化計算方法納入相應(yīng)規(guī)程,但是相應(yīng)計算方法并不精確,存在一定誤差。 本文對蜂窩梁和鋼 — 混凝土蜂窩組合梁抗剪性能以及彎 剪共同作用下的受力性能進行了以下幾方面研究: 從理論上分析和論述了國外相關(guān)規(guī)范、規(guī)程以及國內(nèi)相關(guān)設(shè)計方法中對蜂窩梁和蜂窩組合梁抗剪強度計算的規(guī)定,對比分析它們的優(yōu)點和存在的不足,確定本文的研究內(nèi)容。 分析了六邊形孔、圓形孔和矩形孔蜂窩梁的孔型、開孔大小、翼緣尺寸等參數(shù)對抗剪性能的影響,對不同參數(shù)下的蜂窩梁進行抗剪承載力分析,建立了蜂窩梁抗剪強度計算公式,為工程應(yīng)用提供參考。通過不同混凝土板尺寸、不同連接程度蜂窩組合梁 的計算,采用理論分析與數(shù)值擬合相結(jié)合的方法給出了考慮混凝土板作用和連接程度影響的鋼 混凝土蜂窩組合梁抗剪強度計算方法。 關(guān)鍵詞:蜂窩梁;鋼 混凝土蜂窩組合梁;抗剪強度;彎 剪相關(guān)性;有限元 Abstract Cellular beam is a kind of the steel structure formed by dislocation welding after cutting along the broken line of or web. Cellular beam possesses high flexural capacity and reduces the story by crossing the pipe through the hole. It is well mechanical, aesthetical and economical. In the building structure the connected floor is formed by bining steel beams with concrete floor by stud。 Steelconcrete posite beam。 correlation。近幾年來,國家大力提倡低碳綠色建筑,特別是國家“十二五”規(guī)劃的提出,加快了低碳綠色建筑的發(fā)展步伐。因 此,鋼結(jié)構(gòu)的應(yīng)用越來越注重采用材料強度高、結(jié)構(gòu)形式經(jīng)濟合理、承載力大的新型結(jié)構(gòu)形式。 隨著高層鋼結(jié)構(gòu)設(shè)計理論和建造技術(shù)的成熟,鋼結(jié)構(gòu)建筑總體造價的降低,以及國家鼓勵鋼結(jié)構(gòu)應(yīng)用的政策使得高層建筑鋼結(jié)構(gòu)、大跨度鋼結(jié)構(gòu)和輕型鋼結(jié)構(gòu)建筑在我國獲得前所未有的發(fā)展,高層以及多層建筑、辦公樓運用鋼材建造主體結(jié)構(gòu)也不斷增加。在鋼結(jié)構(gòu)高層建筑中,蜂窩框架梁腹板開孔后,利用孔洞通過管道,有效的解決了管道占用樓層高度的問題。 在建筑結(jié)構(gòu)中,通過剪力連接件將框架鋼梁與混凝土樓板連接可以形成組合樓板,在橋梁結(jié)構(gòu)中將鋼結(jié)構(gòu)主梁與混凝土橋面板連接形成鋼 混凝土組合梁。鋼材具有抗拉和抗壓強度高的優(yōu)點,但是在應(yīng)用中一般截面小、穩(wěn)定性差,容易發(fā)生失穩(wěn)破壞;混凝土具有抗壓強度高的優(yōu)點,但是與抗壓強度相比,抗拉強度很低,較小的拉力下即產(chǎn)生裂縫,使其失去抗拉強度。同時,通過組合作用防止鋼梁整體失穩(wěn),彌補了混凝土抗拉強度低的缺點。 近年來,國內(nèi)外將蜂窩梁和蜂窩組合梁應(yīng)用于土木工程領(lǐng)域的實例越來越多,各國學(xué)者越來越重視對蜂窩構(gòu)件的研究。國內(nèi)學(xué)者對蜂窩構(gòu)件也進行了較多的研究,尚未形成一套完整的理論計算方法納入到規(guī)范中,至使國內(nèi)在應(yīng)用蜂窩構(gòu)件時,或是借鑒其他國家的簡化計算方法,或是按實腹的設(shè)計方法進行設(shè)計,尚無一個相對成熟的標準來衡量設(shè)計的可靠性和經(jīng)濟性。蜂窩梁和蜂窩組合梁開孔口,孔口削弱,抗剪性能受多方面因素影響,受力性能發(fā)生變化,按實腹梁設(shè)計已經(jīng)不能滿足設(shè)計精度要求。 課題 研究目的和意義 對于蜂窩梁與蜂窩組合梁的研究,國內(nèi)外學(xué)者研究主要對抗彎承載力、穩(wěn)定和剛度上進行分析 [2,3],而對于蜂窩梁的抗剪性能研究較少。中南大學(xué)羅群 [4]指出由于梁翼緣板參加抗剪, 圓孔蜂窩梁 翼緣部分對純剪抗力的貢獻達到 %~%,隨著腹板孔高比的增加,翼緣對純剪抗力的貢獻越來越大。[5]等人 指出 有必要對蜂窩梁進行塑性設(shè)計,使更準確預(yù)測蜂窩梁的承載能力,因為蜂窩梁達到極限承載力前,在四個孔角處形成塑性鉸,可以提高承載能力。 本文進行大量的有限元模擬,分析了孔洞形狀、開孔率、翼緣寬度和厚度等參數(shù)對蜂窩梁抗剪極限承載力的影響。在此基礎(chǔ)上,研究蜂窩組合梁在彎矩和剪力共同作用下的相關(guān)性,分析蜂窩組合梁孔洞豎
點擊復(fù)制文檔內(nèi)容
環(huán)評公示相關(guān)推薦
文庫吧 www.dybbs8.com
備案圖鄂ICP備17016276號-1