預(yù)應(yīng)力型鋼超高強混凝土梁受剪性能試驗研究
發(fā)布時間：2019-06-20 05:31
【摘要】：近年來,預(yù)應(yīng)力超高強混凝土結(jié)構(gòu)的研究在國內(nèi)外已經(jīng)取得了一定的研究成果。現(xiàn)有研究資料表明,預(yù)應(yīng)力超高強混凝土結(jié)構(gòu)具有的突出優(yōu)點,如自重輕、耐久性好等,缺點是延性較差。因此,如何保持截面大小的情況下,同時提高預(yù)應(yīng)力超高強混凝土梁的受力性能及延性具有重要的工程意義。綜合型鋼混凝土梁的特點,本文提出在預(yù)應(yīng)力超高強混凝土梁中加入型鋼,通過試驗研究和數(shù)值仿真分析對預(yù)應(yīng)力型鋼超高強混凝土梁的受剪性能進行研究。本文所做的主要工作有： 1、通過11根預(yù)應(yīng)力超高強混凝土梁和4根預(yù)應(yīng)力普通混凝土梁的受剪性能試驗,研究了剪跨比、配箍率、預(yù)應(yīng)力度和混凝土強度等因素對預(yù)應(yīng)力超高強混凝土梁的受剪性能影響。根據(jù)試驗結(jié)果和受剪機理提出了預(yù)應(yīng)力超高強混凝土梁受剪承載力計算公式和彈性剛度折減系數(shù)的建議值(建議值為0.98)。同時指出利用《混凝土結(jié)構(gòu)設(shè)計規(guī)范》(GB50010-2010)計算預(yù)應(yīng)力超高強混凝土梁受剪承載力的計算結(jié)果離散性較大； 2、開展了18根預(yù)應(yīng)力型鋼超高強混凝土梁和4根預(yù)應(yīng)力型鋼普通混凝土梁的受剪性能試驗,并將預(yù)應(yīng)力型鋼超高強混凝土梁與預(yù)應(yīng)力超高強混凝土梁的受剪性能進行比較,系統(tǒng)分析了剪跨比、預(yù)應(yīng)力度、配箍率、混凝土強度、腹板厚度、翼緣寬度比和栓釘高度等因素對試驗梁的破壞形態(tài)、荷載-撓度曲線、極限荷載和剪切延性以及斜裂縫寬度的影響。結(jié)果表明：與預(yù)應(yīng)力超高強混凝土梁相比,型鋼的加入可以明顯改變試驗梁的裂縫形態(tài),且預(yù)應(yīng)力型鋼超高強混凝土梁具有更大的殘余承載力、開裂后剛度和斜裂縫寬度以及剪切延性,并且建議在實際工程中采用薄腹板和大配箍率的截面形式。此外,本文基于疊加法的基本原理建立了預(yù)應(yīng)力型鋼超高強混凝土梁受剪承載力計算公式,計算結(jié)果與試驗值吻合較好； 3、運用有限元分析軟件對預(yù)應(yīng)力型鋼超高強混凝土梁的受剪性能進行數(shù)值仿真分析。結(jié)果表明：極限荷載的計算與試驗結(jié)果基本一致,但是混凝土開裂后的荷載-撓度曲線計算存在偏差； 4、開展了超載狀態(tài)下的循環(huán)加載對預(yù)應(yīng)力型鋼超高強混凝土梁的受剪性能試驗研究,并將循環(huán)加載下的試驗梁與靜載下的試驗梁受剪性能進行比較。結(jié)果表明：循環(huán)加載后試驗梁的破壞形態(tài)與靜載梁相似,且在低荷載水平(Pmax=0.7Pu)下,循環(huán)加載后試驗梁的極限荷載與靜載梁相比沒有降低,剪切延性總體保持不變,但是在高荷載水平(Pmax=0.9Pu)下,極限荷載下降約為10%,并且剪切延性顯著提高,同時在型鋼受壓翼緣處出現(xiàn)水平裂縫,循環(huán)加載也導(dǎo)致試驗梁的裂縫數(shù)目和寬度均增大,且裂縫開展更加充分,循環(huán)加載也會導(dǎo)致試驗梁的荷載-撓度曲線下降段更緩。另外,本文也分析了配箍率、預(yù)應(yīng)力度和荷載水平等因素對試驗梁的荷載-撓度曲線、極限荷載和斜裂縫寬度以及剪切延性的影響。
[Abstract]:In recent years, the research on the structure of prestressed ultra-high strength concrete has made some research achievements at home and abroad. The existing research data show that the prestressed ultra-high strength concrete structure has outstanding advantages such as light weight, good durability and the like, and has the disadvantages of poor ductility. Therefore, it is of great significance to improve the stress and ductility of the prestressed super-high-strength concrete beam at the same time. In this paper, the shear performance of the pre-stressed reinforced concrete beam is studied by means of test and numerical simulation. The main work done in this paper is as follows: 1. The shear-span ratio, the coupling band and the shear-span ratio are studied through the test of the shear performance of 11 prestressed super-high-strength concrete beams and four prestressed common concrete beams. Shear performance of prestressed ultra-high strength concrete beams by factors such as rate, pre-stress degree and concrete strength In response to the results of the test and the shear mechanism, the formulas for calculating the shear-bearing capacity of the prestressed super-high-strength concrete beam and the recommended value of the elastic-stiffness reduction coefficient are proposed (the recommended value is 0.98). Meanwhile, it is pointed out that using the Code for Design of Concrete Structures> (GB50010-2010), the calculation results of the shear bearing capacity of the pre-stressed super-high-strength concrete beam are more discreteness. Large;2,18 prestressed section steel super-high strength concrete beams and 4 pre-stressed section steel general concrete beams are cut The test can be carried out, and the shear performance of the pre-stressed steel super-high strength concrete beam and the pre-stressed ultra-high strength concrete beam is compared, and the breaking ratio, the pre-stress degree, the stirrup ratio, the concrete strength, the thickness of the web, the width of the flange and the height of the bolt nail are systematically analyzed to break the test beam. Bad shape, load-deflection curve, ultimate load and shear ductility, and diagonal crack width The results show that, compared with the pre-stressed ultra-high strength concrete beam, the addition of the section steel can obviously change the crack shape of the test beam, and the pre-stressed section steel super-high-strength concrete beam has greater residual bearing capacity, the rigidity of the crack and the width of the oblique crack, and the shear Ductility, and it is recommended to use a thin web and a large hoop section in the actual project In addition, based on the basic principle of the superposition method, the calculation formula of the shear bearing capacity of the pre-stressed section steel super-high strength concrete beam is established, and the result of the calculation is the same as the test value. Heatai good;3. Use the finite element analysis software to count the shear performance of the pre-stressed steel super-high strength concrete beam The results show that the calculation of the ultimate load is basically the same as that of the test results, but the load-deflection curve after the concrete is cracked the deviation is calculated; and 4, carrying out cyclic loading in the overload state to the prestressed steel super-high-strength concrete beam The shear performance test is studied, and the test beam under the cyclic loading and the test beam under the static load are subject to the test. The results show that the failure mode of the test beam after the cyclic loading is similar to that of the static load beam, and at the low load level (Pmax = 0.7 Pu), the ultimate load of the test beam after the cyclic loading is not reduced as compared with the static load beam, and the shear ductility is generally unchanged, but at the high load level (Pmax = Under the condition of 0.9 Pu, the ultimate load is reduced by about 10%, and the shear ductility is obviously improved. At the same time, the horizontal crack appears at the pressure flange of the section steel, and the cyclic loading also causes the crack number and the width of the test beam to increase and crack The joint is carried out more fully and the cyclic loading also results in the load-deflection of the test beam In addition, the load-deflection curve, the limit load and the width of the oblique crack of the test beam are also analyzed by the factors such as the stirrup ratio, the pre-stress degree and the load level.
【學(xué)位授予單位】：大連理工大學(xué)
【學(xué)位級別】：博士
【學(xué)位授予年份】：2014
【分類號】：TU398.9
本文編號：2502977
[Abstract]:In recent years, the research on the structure of prestressed ultra-high strength concrete has made some research achievements at home and abroad. The existing research data show that the prestressed ultra-high strength concrete structure has outstanding advantages such as light weight, good durability and the like, and has the disadvantages of poor ductility. Therefore, it is of great significance to improve the stress and ductility of the prestressed super-high-strength concrete beam at the same time. In this paper, the shear performance of the pre-stressed reinforced concrete beam is studied by means of test and numerical simulation. The main work done in this paper is as follows: 1. The shear-span ratio, the coupling band and the shear-span ratio are studied through the test of the shear performance of 11 prestressed super-high-strength concrete beams and four prestressed common concrete beams. Shear performance of prestressed ultra-high strength concrete beams by factors such as rate, pre-stress degree and concrete strength In response to the results of the test and the shear mechanism, the formulas for calculating the shear-bearing capacity of the prestressed super-high-strength concrete beam and the recommended value of the elastic-stiffness reduction coefficient are proposed (the recommended value is 0.98). Meanwhile, it is pointed out that using the Code for Design of Concrete Structures> (GB50010-2010), the calculation results of the shear bearing capacity of the pre-stressed super-high-strength concrete beam are more discreteness. Large;2,18 prestressed section steel super-high strength concrete beams and 4 pre-stressed section steel general concrete beams are cut The test can be carried out, and the shear performance of the pre-stressed steel super-high strength concrete beam and the pre-stressed ultra-high strength concrete beam is compared, and the breaking ratio, the pre-stress degree, the stirrup ratio, the concrete strength, the thickness of the web, the width of the flange and the height of the bolt nail are systematically analyzed to break the test beam. Bad shape, load-deflection curve, ultimate load and shear ductility, and diagonal crack width The results show that, compared with the pre-stressed ultra-high strength concrete beam, the addition of the section steel can obviously change the crack shape of the test beam, and the pre-stressed section steel super-high-strength concrete beam has greater residual bearing capacity, the rigidity of the crack and the width of the oblique crack, and the shear Ductility, and it is recommended to use a thin web and a large hoop section in the actual project In addition, based on the basic principle of the superposition method, the calculation formula of the shear bearing capacity of the pre-stressed section steel super-high strength concrete beam is established, and the result of the calculation is the same as the test value. Heatai good;3. Use the finite element analysis software to count the shear performance of the pre-stressed steel super-high strength concrete beam The results show that the calculation of the ultimate load is basically the same as that of the test results, but the load-deflection curve after the concrete is cracked the deviation is calculated; and 4, carrying out cyclic loading in the overload state to the prestressed steel super-high-strength concrete beam The shear performance test is studied, and the test beam under the cyclic loading and the test beam under the static load are subject to the test. The results show that the failure mode of the test beam after the cyclic loading is similar to that of the static load beam, and at the low load level (Pmax = 0.7 Pu), the ultimate load of the test beam after the cyclic loading is not reduced as compared with the static load beam, and the shear ductility is generally unchanged, but at the high load level (Pmax = Under the condition of 0.9 Pu, the ultimate load is reduced by about 10%, and the shear ductility is obviously improved. At the same time, the horizontal crack appears at the pressure flange of the section steel, and the cyclic loading also causes the crack number and the width of the test beam to increase and crack The joint is carried out more fully and the cyclic loading also results in the load-deflection of the test beam In addition, the load-deflection curve, the limit load and the width of the oblique crack of the test beam are also analyzed by the factors such as the stirrup ratio, the pre-stress degree and the load level.
【學(xué)位授予單位】：大連理工大學(xué)
【學(xué)位級別】：博士
【學(xué)位授予年份】：2014
【分類號】：TU398.9
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