预应力型钢超高强混凝土梁受剪性能试验研究
发布时间：2019-06-20 05:31
【摘要】：近年来,预应力超高强混凝土结构的研究在国内外已经取得了一定的研究成果。现有研究资料表明,预应力超高强混凝土结构具有的突出优点,如自重轻、耐久性好等,缺点是延性较差。因此,如何保持截面大小的情况下,同时提高预应力超高强混凝土梁的受力性能及延性具有重要的工程意义。综合型钢混凝土梁的特点,本文提出在预应力超高强混凝土梁中加入型钢,通过试验研究和数值仿真分析对预应力型钢超高强混凝土梁的受剪性能进行研究。本文所做的主要工作有： 1、通过11根预应力超高强混凝土梁和4根预应力普通混凝土梁的受剪性能试验,研究了剪跨比、配箍率、预应力度和混凝土强度等因素对预应力超高强混凝土梁的受剪性能影响。根据试验结果和受剪机理提出了预应力超高强混凝土梁受剪承载力计算公式和弹性刚度折减系数的建议值(建议值为0.98)。同时指出利用《混凝土结构设计规范》(GB50010-2010)计算预应力超高强混凝土梁受剪承载力的计算结果离散性较大； 2、开展了18根预应力型钢超高强混凝土梁和4根预应力型钢普通混凝土梁的受剪性能试验,并将预应力型钢超高强混凝土梁与预应力超高强混凝土梁的受剪性能进行比较,系统分析了剪跨比、预应力度、配箍率、混凝土强度、腹板厚度、翼缘宽度比和栓钉高度等因素对试验梁的破坏形态、荷载-挠度曲线、极限荷载和剪切延性以及斜裂缝宽度的影响。结果表明：与预应力超高强混凝土梁相比,型钢的加入可以明显改变试验梁的裂缝形态,且预应力型钢超高强混凝土梁具有更大的残余承载力、开裂后刚度和斜裂缝宽度以及剪切延性,并且建议在实际工程中采用薄腹板和大配箍率的截面形式。此外,本文基于叠加法的基本原理建立了预应力型钢超高强混凝土梁受剪承载力计算公式,计算结果与试验值吻合较好； 3、运用有限元分析软件对预应力型钢超高强混凝土梁的受剪性能进行数值仿真分析。结果表明：极限荷载的计算与试验结果基本一致,但是混凝土开裂后的荷载-挠度曲线计算存在偏差； 4、开展了超载状态下的循环加载对预应力型钢超高强混凝土梁的受剪性能试验研究,并将循环加载下的试验梁与静载下的试验梁受剪性能进行比较。结果表明：循环加载后试验梁的破坏形态与静载梁相似,且在低荷载水平(Pmax=0.7Pu)下,循环加载后试验梁的极限荷载与静载梁相比没有降低,剪切延性总体保持不变,但是在高荷载水平(Pmax=0.9Pu)下,极限荷载下降约为10%,并且剪切延性显著提高,同时在型钢受压翼缘处出现水平裂缝,循环加载也导致试验梁的裂缝数目和宽度均增大,且裂缝开展更加充分,循环加载也会导致试验梁的荷载-挠度曲线下降段更缓。另外,本文也分析了配箍率、预应力度和荷载水平等因素对试验梁的荷载-挠度曲线、极限荷载和斜裂缝宽度以及剪切延性的影响。
[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.
【学位授予单位】：大连理工大学
【学位级别】：博士
【学位授予年份】：2014
【分类号】：TU398.9
本文编号：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.
【学位授予单位】：大连理工大学
【学位级别】：博士
【学位授予年份】：2014
【分类号】：TU398.9
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