新型预制T形肋预应力混凝土叠合板抗弯性能研究
发布时间：2018-11-15 11:57
【摘要】：传统PK板预留的大量孔洞模具制作复杂、耗损大、支设和拆除耗时长,因此成本相对较高、生产效率较低。传统PK板在试验过程中曾出现肋与底板剥离甚至断开的现象,存在安全隐患。为此,本文针对传统PK板进行改进,即PCSTRT(Prestressed Precast Concrete Slab with T Ribs and Tripods)板,包括:(1)预制预应力混凝土底板;(2)带三角形钢筋支架的混凝土肋。在底板和T型肋之间设置三角形钢筋支架锚固,利用钢筋与混凝土之间的粘结力、新旧混凝土粗糙结合面的粘结力,防止剥离破坏;在预应力钢丝上部增设横向分布钢筋,减少现场钢筋的绑扎与安装;改进的PCSTRT板可直接按单向受力板进行计算,计算模型简单可靠;PCSTRT制作工艺简单、人工少、生产效率高、且能避免T型肋与预制底板发生剥离破坏。本文采用试验研究、理论分析和有限元模拟的方法,对PCSTRT板进行抗弯性能研究。采用沙袋模拟均布荷载,主要研究PCSTRT板在抗弯试验过程中的裂缝分布情况、挠度、开裂荷载、极限承载力和破坏模态。本文主要试验研究钢筋支架间距、腹板高度和翼缘厚度对PCSTRT板抗弯性能的影响。比较试验研究、理论分析和有限元模拟结果,得到结论:(1)破坏现象为跨中挠度超过板净跨的1/50和受拉主筋处的裂缝宽度超过1.5mm,PCSTRT板最终的破坏模态为底板混凝土断裂、翼缘上部混凝土压碎。(2)增加腹板高度和翼缘厚度对PCSTRT板的抗弯承载力有显著影响。钢筋支架的作用主要是增加新老混凝土的结合作用、使新老混凝土协同受力,提高钢筋与混凝土的粘结能力,在PCSTRT板受弯时不产生T型肋与预制底板的剥离破坏。钢筋支架的间距为200mm较为合理。(3)按照《混凝土结构设计规范》(50010-2010)的公式得到PCSTRT板的开裂荷载计算值与试验值最大误差为10.08%,挠度的最大误差为8.52%,计算结果比较准确。(4)ABAQUS对PCSTRT板的有限元模拟结果显示跨中挠度最大,均匀向两端支座递减,符合试验现象。在开裂荷载作用下挠度的模拟值与试验值最大误差为12.33%,吻合良好。由于ABAQUS本身对混凝土结构有限元分析的缺陷性,PCSTRT板开裂之后的荷载-挠度曲线不再具有参考价值。
[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.
【学位授予单位】：山东大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU398.9
本文编号：2333244
[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.
【学位授予单位】：山东大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU398.9
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