鋼—混凝土組合桁架梁抗彎性能研究
發(fā)布時間：2018-08-05 11:39
【摘要】：鋼-混凝土組合桁架梁是由鋼桁架與混凝土板組合而成的受彎構(gòu)件，這種組合梁具有優(yōu)越的空間利用性能和顯著的工程經(jīng)濟效益。鋼-混凝土組合桁架梁目前在我國的研究還處于起步階段，相關(guān)的理論和試驗研究尚欠不足，尤其是缺乏適合我國工程設(shè)計需要的組合桁架結(jié)構(gòu)承載性能及設(shè)計方法的研究。 由于鋼-混凝土組合桁架梁類型多樣，受力性能亦較復(fù)雜，論文選取結(jié)構(gòu)形式相對典型，在我國部分地區(qū)已開始初步使用的圓鋼管組合桁架梁為研究對象，通過試驗研究、有限元數(shù)值模擬、參數(shù)分析以及理論推導(dǎo)，研究鋼-混凝土組合桁架梁的抗彎承載性能及其影響因素。 論文首先采用試驗方法研究了鋼-混凝土組合桁架梁的抗彎承載能力。設(shè)計了4根編號為CB1、CB2a、CB2b和CB3的鋼-混凝土組合桁架梁試件進行抗彎試驗，詳細介紹了試件單調(diào)加載靜力試驗的全過程情況，包括組合梁的破壞形態(tài)、變形性能、控制截面應(yīng)變、滑移等。以CB2b試件為例，分析了混凝土受壓翼緣板的應(yīng)變及應(yīng)力分布、荷載-撓度曲線以及抗彎極限承載力的變化特點。試驗結(jié)果表明：鋼-混凝土組合桁架梁的整個截面應(yīng)變基本符合平截面假定；鋼-混凝土組合梁的混凝土受壓翼緣存在較明顯的剪力滯后效應(yīng)；鋼-混凝土組合桁架梁具有較高的受彎承載能力和一定的延性性能。 在試驗研究的基礎(chǔ)上，論文以4個試件為例分別建立了符合工程實際的鋼-混凝土組合桁架梁的有限元模型。通過計算分析，了解了組合桁架梁的應(yīng)力變化特點、組合梁的荷載-位移關(guān)系、荷載-滑移關(guān)系以及組合桁架梁的極限承載力，并與試驗結(jié)果進行了對比。分析表明：從彈性剛度來看，4個試件有限元計算的彈性剛度均大于試驗彈性剛度；從承載力來看，有限元得到的構(gòu)件極限承載力與試驗結(jié)果較接近，變形性能與試驗結(jié)果基本吻合。 為了便于設(shè)計應(yīng)用，論文對鋼-混凝土組合桁架梁受壓混凝土翼板的有效寬度進行了大量的計算分析，并將分析結(jié)果與我國現(xiàn)行鋼結(jié)構(gòu)設(shè)計規(guī)范有關(guān)組合梁有效寬度的規(guī)定做了比較。論文對上述4個組合桁架梁試件混凝土翼板的應(yīng)力分布情況分析表明：組合桁架梁在荷載作用下，隨著作用荷載的增加，有效寬度系數(shù)變化較為復(fù)雜，但總體上呈增大的趨勢。當(dāng)其他條件不變時，組合梁的寬跨比（b/l）越大，有效寬度系數(shù)e越小。增大組合梁混凝土翼板寬度時，混凝土板上的應(yīng)力分布不均勻程度會增大，剪力滯后效應(yīng)加劇。因此，設(shè)計計算時應(yīng)適當(dāng)限制組合梁的寬跨比（b/l），使混凝土翼板充分發(fā)揮承載能力。設(shè)計計算時，如對梁的寬跨比不加區(qū)分，完全按照鋼結(jié)構(gòu)設(shè)計規(guī)范的規(guī)定取值，則有可能高估寬跨比較小的組合梁的極限承載力，導(dǎo)致偏于不安全的結(jié)果。在極限承載力狀態(tài)下，組合桁架梁有效寬度的計算結(jié)果不低于現(xiàn)行鋼結(jié)構(gòu)規(guī)范的取值，對于不同高跨比的鋼-混凝土組合桁架梁，設(shè)計計算時，可以完全按照鋼結(jié)構(gòu)設(shè)計規(guī)范的規(guī)定取值，計算組合梁的極限承載力。為了便于設(shè)計應(yīng)用，論文最后還給出了便于工程應(yīng)用的有效寬度簡化計算公式。 論文對組合梁的混凝土板厚度和寬度、腹桿截面尺寸、桁架梁上弦托板寬度以及栓釘抗剪連接程度等參數(shù)進行了分析，研究這些設(shè)計參數(shù)對組合桁架梁抗彎性能的影響特點。研究表明：當(dāng)其他參數(shù)不變時，組合梁腹桿截面徑厚比增加時，組合梁的初期剛度、后期剛度以及極限承載力均無明顯變化。因此設(shè)計時適當(dāng)考慮采用較厚且較寬闊的混凝土翼板，既可以提高組合梁承載力又能改善組合梁的變形性能。另外，上弦托板的寬度和栓釘抗剪連接程度都會在一定范圍內(nèi)提高組合梁的承載能力。 為能從理論上更好地把握組合桁架梁的抗彎性能，論文推導(dǎo)了鋼-混凝土組合桁架梁受彎承載力理論分析的基本假定和計算公式，總結(jié)組合桁架梁極限承載力的實用計算方法并與試驗研究和有限元分析得到的數(shù)據(jù)結(jié)果進行了對比。研究表明：對于部分抗剪連接的桁架組合梁（CB1），有限元計算值和理論值幾乎一致，而試驗值比理論值偏小5%。對于完全抗剪連接的桁架組合梁（CB2a、CB2b和CB3），試驗值比理論值平均偏大7%，有限元計算值比理論值偏大約19%�？梢娫O(shè)計時采用理論推導(dǎo)的實用公式是偏于安全的。 論文提出了一種新型雙釘頭型栓釘剪力連接件形式，，并進行了推出試驗有限元模擬分析，在此基礎(chǔ)上討論了影響新型栓釘連接件抗剪承載力的主要因素，并結(jié)合有關(guān)規(guī)范公式提出了設(shè)計建議，最后還分析了采用新型栓釘?shù)匿?混凝土組合桁架梁的抗彎承載力。研究表明：當(dāng)其他參數(shù)不變時，采用新型栓釘?shù)慕M合梁極限承載力明顯提高，后期剛度有所提高，變形能力顯著增強。
[Abstract]:Steel concrete composite truss beams are flexural members composed of steel trusses and concrete plates. This composite beam has superior spatial utilization performance and significant engineering economic benefits. The research of steel concrete composite truss beams in China is still in its infancy, and the related theory and test research are still insufficient, especially the lack of it. Study on bearing capacity and design method of composite trusses suitable for engineering design in China.
Because of the variety of the steel and concrete composite truss beam and the complicated force performance, the paper selects the structure form relatively typical. The circular steel tube composite truss beam which has been initially used in some areas of our country is the research object. Through the experimental study, the finite element numerical simulation, the parameter analysis and the theoretical deduction, the steel concrete composite truss is studied. Bending bearing capacity of beam and its influencing factors.
In this paper, the flexural bearing capacity of steel concrete composite truss beam is studied by experimental method. 4 steel concrete composite truss beams, named CB1, CB2a, CB2b and CB3, are designed for bending test. The whole process of monotonic loading test is introduced in detail, including the failure form, deformation performance and control of the composite beams. In the case of CB2b specimen, the strain and stress distribution, load deflection curve and flexural ultimate bearing capacity of concrete compression flange are analyzed. The experimental results show that the whole section strain of steel concrete composite truss beam is basically conformed to the assumption of flat section; and the coagulation of steel concrete composite beams is coagulated. There is obvious shear lag effect on the compressed flange of soil, and the steel-concrete composite truss beam has higher flexural bearing capacity and certain ductility.
On the basis of the experimental research, the finite element model of the steel concrete composite truss beam which is in line with the engineering practice is set up with 4 specimens as an example. Through the calculation and analysis, the stress variation characteristics of the composite truss beam, the load displacement relation of the composite beam, the load slip relation and the ultimate bearing capacity of the composite truss beam are obtained. The results of the test are compared. The analysis shows that the elastic stiffness of the finite element calculation of the 4 specimens is greater than the elastic stiffness from the elastic stiffness. From the bearing capacity, the ultimate bearing capacity of the finite element is close to the test results, and the deformation performance is in agreement with the experimental results.
In order to facilitate the design and application, the effective width of the compression concrete wing plate of the steel concrete composite truss beam is calculated and analyzed. The analysis results are compared with the provisions of the current steel structure design specification of our country on the effective width of the composite beams. The stress of the concrete wing plate of the 4 composite truss beams is analyzed in this paper. The analysis of cloth situation shows that the effective width coefficient changes more complicated with the increase of loading load on the composite truss beam, but on the whole it is increasing. When the other conditions are constant, the wider span ratio (b/l) and the effective width coefficient e are smaller when the other conditions are constant. The uneven degree of force distribution will increase and the shear lag effect intensifies. Therefore, the width span ratio (b/l) of the composite beam should be limited in design and calculation to make the concrete wing board fully play the bearing capacity. In the design calculation, if the width span ratio of the beam is not distinguished, it is possible to overestimate the wide span and span according to the specification of the steel structure specification. The ultimate bearing capacity of composite beams leads to unsafe results. In the state of ultimate bearing capacity, the calculation results of the effective width of the composite truss beam are not less than the values of the existing steel structure specifications. For the design and calculation of the steel concrete composite truss beams with different high span ratio, the design calculation can be taken according to the specification of the steel structure design specification. The ultimate bearing capacity of composite beams is calculated. In order to facilitate the design and application, a simplified formula for calculating the effective width of composite beams is given.
The paper analyzes the thickness and width of the concrete slab of the composite beam, the section size of the abdominal rod, the width of the upper chord plate of the truss beam and the shear connection degree of the stud, and studies the influence characteristics of these design parameters on the flexural performance of the composite truss beam. There is no obvious change in the initial stiffness, late stiffness and ultimate bearing capacity of the composite beams. Therefore, the proper consideration of the use of a thicker and wider concrete wing plate in the design can not only improve the bearing capacity of the composite beams but also improve the deformation performance of the composite beams. In addition, the width of the upper chord plate and the shear connection degree of the stud can be in a certain range. The bearing capacity of the composite beam is improved.
In order to better grasp the flexural performance of the composite truss beam theoretically, the basic hypothesis and calculation formula of the theoretical analysis of the flexural bearing capacity of the steel-concrete composite truss beam are derived, and the practical calculation method of the ultimate bearing capacity of the composite truss beam is summarized and compared with the data obtained from the experimental study and the finite element analysis. The results show that for the truss composite beams (CB1) with partial shear connection, the calculated values are almost the same as the theoretical values, and the test values are smaller than the theoretical values 5%. for the fully shear connection truss composite beams (CB2a, CB2b and CB3), the experimental values are 7% larger than the theoretical values, and the finite element calculation value is about 19%. to the theoretical value of the visual design. The practical formula for derivation is partial to safety.
In this paper, a new type of double nail head type stud shear connector is proposed, and the finite element simulation analysis is carried out. On this basis, the main factors affecting the shear bearing capacity of the new type stud connector are discussed, and the design suggestions are put forward with the relevant standard formulas, and the steel concrete group with new studs is analyzed at the end of the paper. The study shows that the ultimate bearing capacity of composite beams with new studs is obviously improved when the other parameters are constant, and the later stiffness is improved and the deformation capacity is greatly enhanced.
【學(xué)位授予單位】：鄭州大學(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：2165684
[Abstract]:Steel concrete composite truss beams are flexural members composed of steel trusses and concrete plates. This composite beam has superior spatial utilization performance and significant engineering economic benefits. The research of steel concrete composite truss beams in China is still in its infancy, and the related theory and test research are still insufficient, especially the lack of it. Study on bearing capacity and design method of composite trusses suitable for engineering design in China.
Because of the variety of the steel and concrete composite truss beam and the complicated force performance, the paper selects the structure form relatively typical. The circular steel tube composite truss beam which has been initially used in some areas of our country is the research object. Through the experimental study, the finite element numerical simulation, the parameter analysis and the theoretical deduction, the steel concrete composite truss is studied. Bending bearing capacity of beam and its influencing factors.
In this paper, the flexural bearing capacity of steel concrete composite truss beam is studied by experimental method. 4 steel concrete composite truss beams, named CB1, CB2a, CB2b and CB3, are designed for bending test. The whole process of monotonic loading test is introduced in detail, including the failure form, deformation performance and control of the composite beams. In the case of CB2b specimen, the strain and stress distribution, load deflection curve and flexural ultimate bearing capacity of concrete compression flange are analyzed. The experimental results show that the whole section strain of steel concrete composite truss beam is basically conformed to the assumption of flat section; and the coagulation of steel concrete composite beams is coagulated. There is obvious shear lag effect on the compressed flange of soil, and the steel-concrete composite truss beam has higher flexural bearing capacity and certain ductility.
On the basis of the experimental research, the finite element model of the steel concrete composite truss beam which is in line with the engineering practice is set up with 4 specimens as an example. Through the calculation and analysis, the stress variation characteristics of the composite truss beam, the load displacement relation of the composite beam, the load slip relation and the ultimate bearing capacity of the composite truss beam are obtained. The results of the test are compared. The analysis shows that the elastic stiffness of the finite element calculation of the 4 specimens is greater than the elastic stiffness from the elastic stiffness. From the bearing capacity, the ultimate bearing capacity of the finite element is close to the test results, and the deformation performance is in agreement with the experimental results.
In order to facilitate the design and application, the effective width of the compression concrete wing plate of the steel concrete composite truss beam is calculated and analyzed. The analysis results are compared with the provisions of the current steel structure design specification of our country on the effective width of the composite beams. The stress of the concrete wing plate of the 4 composite truss beams is analyzed in this paper. The analysis of cloth situation shows that the effective width coefficient changes more complicated with the increase of loading load on the composite truss beam, but on the whole it is increasing. When the other conditions are constant, the wider span ratio (b/l) and the effective width coefficient e are smaller when the other conditions are constant. The uneven degree of force distribution will increase and the shear lag effect intensifies. Therefore, the width span ratio (b/l) of the composite beam should be limited in design and calculation to make the concrete wing board fully play the bearing capacity. In the design calculation, if the width span ratio of the beam is not distinguished, it is possible to overestimate the wide span and span according to the specification of the steel structure specification. The ultimate bearing capacity of composite beams leads to unsafe results. In the state of ultimate bearing capacity, the calculation results of the effective width of the composite truss beam are not less than the values of the existing steel structure specifications. For the design and calculation of the steel concrete composite truss beams with different high span ratio, the design calculation can be taken according to the specification of the steel structure design specification. The ultimate bearing capacity of composite beams is calculated. In order to facilitate the design and application, a simplified formula for calculating the effective width of composite beams is given.
The paper analyzes the thickness and width of the concrete slab of the composite beam, the section size of the abdominal rod, the width of the upper chord plate of the truss beam and the shear connection degree of the stud, and studies the influence characteristics of these design parameters on the flexural performance of the composite truss beam. There is no obvious change in the initial stiffness, late stiffness and ultimate bearing capacity of the composite beams. Therefore, the proper consideration of the use of a thicker and wider concrete wing plate in the design can not only improve the bearing capacity of the composite beams but also improve the deformation performance of the composite beams. In addition, the width of the upper chord plate and the shear connection degree of the stud can be in a certain range. The bearing capacity of the composite beam is improved.
In order to better grasp the flexural performance of the composite truss beam theoretically, the basic hypothesis and calculation formula of the theoretical analysis of the flexural bearing capacity of the steel-concrete composite truss beam are derived, and the practical calculation method of the ultimate bearing capacity of the composite truss beam is summarized and compared with the data obtained from the experimental study and the finite element analysis. The results show that for the truss composite beams (CB1) with partial shear connection, the calculated values are almost the same as the theoretical values, and the test values are smaller than the theoretical values 5%. for the fully shear connection truss composite beams (CB2a, CB2b and CB3), the experimental values are 7% larger than the theoretical values, and the finite element calculation value is about 19%. to the theoretical value of the visual design. The practical formula for derivation is partial to safety.
In this paper, a new type of double nail head type stud shear connector is proposed, and the finite element simulation analysis is carried out. On this basis, the main factors affecting the shear bearing capacity of the new type stud connector are discussed, and the design suggestions are put forward with the relevant standard formulas, and the steel concrete group with new studs is analyzed at the end of the paper. The study shows that the ultimate bearing capacity of composite beams with new studs is obviously improved when the other parameters are constant, and the later stiffness is improved and the deformation capacity is greatly enhanced.
【學(xué)位授予單位】：鄭州大學(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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