【摘要】：傳統(tǒng)PK板預留的大量孔洞模具制作復雜、耗損大、支設和拆除耗時長,因此成本相對較高、生產(chǎn)效率較低。傳統(tǒng)PK板在試驗過程中曾出現(xiàn)肋與底板剝離甚至斷開的現(xiàn)象,存在安全隱患。為此,本文針對傳統(tǒng)PK板進行改進,即PCSTRT(Prestressed Precast Concrete Slab with T Ribs and Tripods)板,包括:(1)預制預應力混凝土底板;(2)帶三角形鋼筋支架的混凝土肋。在底板和T型肋之間設置三角形鋼筋支架錨固,利用鋼筋與混凝土之間的粘結力、新舊混凝土粗糙結合面的粘結力,防止剝離破壞;在預應力鋼絲上部增設橫向分布鋼筋,減少現(xiàn)場鋼筋的綁扎與安裝;改進的PCSTRT板可直接按單向受力板進行計算,計算模型簡單可靠;PCSTRT制作工藝簡單、人工少、生產(chǎn)效率高、且能避免T型肋與預制底板發(fā)生剝離破壞。本文采用試驗研究、理論分析和有限元模擬的方法,對PCSTRT板進行抗彎性能研究。采用沙袋模擬均布荷載,主要研究PCSTRT板在抗彎試驗過程中的裂縫分布情況、撓度、開裂荷載、極限承載力和破壞模態(tài)。本文主要試驗研究鋼筋支架間距、腹板高度和翼緣厚度對PCSTRT板抗彎性能的影響。比較試驗研究、理論分析和有限元模擬結果,得到結論:(1)破壞現(xiàn)象為跨中撓度超過板凈跨的1/50和受拉主筋處的裂縫寬度超過1.5mm,PCSTRT板最終的破壞模態(tài)為底板混凝土斷裂、翼緣上部混凝土壓碎。(2)增加腹板高度和翼緣厚度對PCSTRT板的抗彎承載力有顯著影響。鋼筋支架的作用主要是增加新老混凝土的結合作用、使新老混凝土協(xié)同受力,提高鋼筋與混凝土的粘結能力,在PCSTRT板受彎時不產(chǎn)生T型肋與預制底板的剝離破壞。鋼筋支架的間距為200mm較為合理。(3)按照《混凝土結構設計規(guī)范》(50010-2010)的公式得到PCSTRT板的開裂荷載計算值與試驗值最大誤差為10.08%,撓度的最大誤差為8.52%,計算結果比較準確。(4)ABAQUS對PCSTRT板的有限元模擬結果顯示跨中撓度最大,均勻向兩端支座遞減,符合試驗現(xiàn)象。在開裂荷載作用下?lián)隙鹊哪M值與試驗值最大誤差為12.33%,吻合良好。由于ABAQUS本身對混凝土結構有限元分析的缺陷性,PCSTRT板開裂之后的荷載-撓度曲線不再具有參考價值。
[Abstract]:A large number of holes reserved by traditional competitive plates are complex in making, large in wear, and in long time in supporting and dismantling, so the cost is relatively high and the production efficiency is low. In the process of test, the traditional competitive plate has been stripped off or even disconnected from the bottom plate, so there is a hidden danger of safety. For this reason, this paper improves the traditional competitive slab, that is, PCSTRT (Prestressed Precast Concrete Slab with T Ribs and Tripods) slab, which includes: (1) prefabricated prestressed concrete floor slab; (2) concrete rib with triangular reinforcement support. The triangular reinforcement support is set up between the bottom slab and T-shaped rib, and the adhesion force between the steel bar and concrete is used to prevent the peeling damage. The transverse distribution steel bar is added to the upper part of the prestressed steel wire to reduce the binding and installation of the steel bar on site, and the improved PCSTRT slab can be calculated directly according to the unidirectional stress plate, and the calculation model is simple and reliable. PCSTRT has the advantages of simple manufacturing process, less manpower, high production efficiency, and can avoid stripping damage of T-shaped rib and prefabricated floor. In this paper, the bending behavior of PCSTRT plate is studied by means of experimental study, theoretical analysis and finite element simulation. The distribution of cracks, deflection, cracking load, ultimate bearing capacity and failure mode of PCSTRT plate during bending test were studied by using sandbag simulation. In this paper, the influence of the distance between steel supports, web height and flange thickness on the bending behavior of PCSTRT plate is studied. By comparing the experimental results, theoretical analysis and finite element simulation results, the following conclusions are obtained: (1) the failure phenomenon is that the deflection of the middle span exceeds 1 / 50 of the net span of the plate and the width of the crack at the main tensile reinforcement is more than 1.5 mm. The ultimate failure mode of PCSTRT plate is bottom slab concrete fracture and concrete crushing of upper flange. (2) increasing web height and flange thickness have significant influence on flexural bearing capacity of PCSTRT plate. The main function of steel support is to increase the combination of new and old concrete, to make the new and old concrete synergistic force, to improve the bond ability between reinforcement and concrete, and to avoid the peeling damage between T-rib and prefabricated floor when PCSTRT slab is bending. (3) according to the formula of "Design Code for concrete structures" (50010-2010), the maximum error between the calculated value of cracking load and the test value of PCSTRT slab is 10.08, and the maximum error of deflection is 8.52. (4) the finite element simulation results of PCSTRT plate by ABAQUS show that the deflection in the middle of the span is the largest, and the deflection decreases uniformly to the two ends of the plate, which is in accordance with the experimental phenomenon. The maximum error between the simulated value and the test value under cracking load is 12.33, which is in good agreement. Because of the defect of ABAQUS in finite element analysis of concrete structure, the load-deflection curve of PCSTRT slab after cracking is no longer of reference value.
【學位授予單位】：山東大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TU398.9

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