本文選題：雙向疊合樓板 + 疊合樓板拼縫　； 參考：《合肥工業(yè)大學》2014年博士論文

【摘要】：為適應國家十二五規(guī)劃及未來對住宅產業(yè)化發(fā)展的需求,對在裝配式結構中占比重較大的鋼筋混凝土疊合樓板開展研究�，F有疊合樓板主要是單向受力形式,拼縫處受力性能較弱,綜合造價較高,這些都降低了疊合樓板的推廣速度,影響住宅產業(yè)進程。 國內外專家學者對疊合底板形式和雙向疊合樓板板拼縫處理做了一些研究,并提出一些新的疊合底板形式和拼縫處理構造,但都存在一定的局限性,課題組從拼縫處的受力機理來研究疊合樓板的拼縫處承載能力,考慮施工易操作性,通過構造來解決疊合樓板的拼縫傳力問題。 文中首先研究了疊合樓板疊合面的抗剪和抗拉粘結性能,分析了拼縫處截面受力狀態(tài)、拼縫處鋼筋錨固受力狀態(tài)和疊合面的受彎狀態(tài)；分析了常用的格構鋼筋對疊合樓板的剛度和承載的影響,采用子結構理論建立剛度計算公式；對現有的粘結滑移曲線進行比較分析,在此基礎上,提出改進的粘結滑移曲線,并用數值模擬進行驗證；通過12塊疊合樓板的試驗和有限元數值模擬,研究不同拼縫連接形式疊合板的受力性能；文中最后提出了一種新型增強拼縫連接形式,并用試驗驗證了其受力性能。論文研究的主要成果如下： (1)通過對疊合結構疊合面抗剪、抗拉試驗統(tǒng)計分析發(fā)現,當混凝土強度大于C20時,疊合面試驗抗剪強度與混凝土立方體抗壓強度表現出了較強的相關性,回歸方程顯著；對疊合面抗拉強度與后澆混凝土的軸拉強度表現出較強的相關性,回歸結果可信度較高。 (2)推導出了拼縫處鋼筋錨固承載力受疊合面影響系數,通過分析得出對于設置格構鋼筋的疊合樓板,拼縫處可以滿足受拉鋼筋錨固要求；從疊合樓板拼縫處疊合面受彎狀態(tài)推導出帶拼縫疊合樓板的疊合面破壞時極限彎矩。 (3)通過我國規(guī)范的短期剛度計算公式的推導過程,分析了應用于板的剛度計算時存在的局限性；對比分析了不同剛度計算公式,得出了一些有益的結論；采用子結構理論,對格構鋼筋進行了剛度等效,推導出等效計算公式,以便分析格構鋼筋對疊合板的剛度貢獻。 (4)提出了改進的粘結滑移曲線本構模型,并進行了數值模擬,模擬曲線和試驗曲線符合較好,驗證了模型的可靠性。 (5)通過12塊疊合樓板的試驗和有限元分析結果表明：對拼縫處未設附加約束的疊合樓板具有一定的承載能力,但搭接縱筋超過屈服荷載后,會產生脆性斷裂破壞；當設置格構鋼筋約束時,無論是端拼縫和側拼縫(格構鋼筋橫向設置和豎向設置),都能夠保證拼縫處鋼筋的有效傳力,實現“等承載力連接”。 (6)數值計算結果和試驗結果吻合較好,表明文中的數值模擬方法的可靠性；數值分析結果表明,模型中添加粘結彈簧單元對承載力和剛度影響不大,但對于裂縫開展有很明顯的影響。 (7)文中提出了一種新型增強型整體式拼縫連接形式,試驗研究結果表明：采用該種連接形式的疊合板在拼縫處剛度得到加強,受彎承載力得到不同程度地提高,拼縫處最大應力得到轉移,裂縫較遲出現,可以實現拼縫處的等同現澆。
[Abstract]:In order to meet the needs of the national planning and future development of housing industrialization in the 12th Five-Year, the reinforced concrete overlapped slab which occupies a large proportion in the assembly structure is studied. The existing laminated slab is mainly one way of unidirectional force, weak force performance at the joint and high comprehensive cost, which all reduce the spread speed of the laminated floor. The process of the housing industry.
Experts and scholars at home and abroad have done some research on the joint floor form and the joint treatment of double stacked slab plate, and put forward some new overlapped floor form and joint treatment structure, but there are some limitations. Over structure is used to solve the problem of splicing force of composite floor.
In this paper, the shear and tensile bond properties of overlapped floor overlapped surfaces are studied. The stress state of the cross section, the stress state of the reinforcing bar anchorage at the joint and the bending state of the overlapped surface are analyzed, and the influence of the commonly used lattice bars on the stiffness and bearing of the laminated floor is analyzed, and the stiffness calculation formula is established by the substructure theory. The existing bond slip curve is compared and analyzed. On this basis, the improved bond slip curve is proposed and verified by numerical simulation. Through the test of 12 laminated slab and finite element numerical simulation, the stress performance of the laminated plate with different joint forms is studied. Finally, a new type of reinforced joint joint shape is proposed. The main results of the study are as follows:
(1) through the statistical analysis of the shear resistance and tensile test of superimposed overlapped surface, it is found that when the strength of concrete is greater than C20, the shear strength of the composite surface test has a strong correlation with the compressive strength of the concrete cube, and the regression equation is significant, and the tensile strength of the overlapped surface has a strong correlation with the axial tensile strength of the post poured concrete. The reliability of the regression results was high.
(2) the influence coefficient of the rebar anchorage bearing capacity of the joint at the joint is deduced. Through the analysis, it is concluded that the joint slab can meet the anchorage requirements of the reinforced bar, and the ultimate bending moment is deduced from the bending state of the overlapped surface at the joint of the laminated slab.
(3) through the derivation of the short term stiffness calculation formula in our country, the limitations of the stiffness calculation applied to the plate are analyzed, the calculation formulas of different stiffness are compared and analyzed, and some useful conclusions are obtained. The equivalent calculation formula is derived for the lattice steel by the substructure theory, so as to analyze the lattice. The contribution of the steel bar to the stiffness of the laminated plate.
(4) an improved bond slip curve constitutive model is proposed, and the numerical simulation is carried out. The simulation curves and test curves are in good agreement, which verifies the reliability of the model.
(5) through the test and finite element analysis of 12 laminated plates, the results of the finite element analysis show that the laminated slab with no additional constraints at the joint has a certain bearing capacity, but when the lap bar exceeds the yield load, it will produce brittle fracture failure. Vertical setting can ensure effective transfer force of reinforcement and achieve "equal bearing capacity connection".
(6) the numerical results are in good agreement with the test results, indicating the reliability of the numerical simulation method in the paper, and the results of numerical analysis show that the addition of the bond spring element has little effect on the bearing capacity and stiffness, but it has a significant effect on the crack development.
(7) a new type of reinforced integral joint form is put forward in this paper. The experimental results show that the stiffness of the joint plate with this type of joint is strengthened, the flexural bearing capacity is improved in varying degrees, the maximum stress at the joint is transferred, the crack joint appears later, and the equivalent cast in place can be realized.
【學位授予單位】：合肥工業(yè)大學
【學位級別】：博士
【學位授予年份】：2014
【分類號】：TU375.2

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