预制空心楼盖板HPFL整体化后平面外强度研究

发布时间：2018-06-12 01:43

本文选题：HPFL + 预制空心板　；参考：《湖南大学》2015年硕士论文

【摘要】：本文对高性能水泥复合砂浆钢筋网(以下简称HPFL)薄层作为预制空心楼板的叠合层,对整体化后的预制空心楼盖板平面外强度进行试验研究。预制空心楼盖板HPFL整体化是结合预制圆孔空心板和HPFL薄层两者的优点,通过在板上铺设不同宽度的HPFL窄条带,使HPFL叠合层和空心板形成一个整体,增强楼板的整体性,进而增强板的平面外强度、克服预制空心楼盖板整体性差的问题,使HPFL预制空心楼盖板成为装配整体式楼盖体系。试验通过各拼装预制空心板下降的挠度值、叠合层裂缝开展情况,以及试件在各工况下任一预制空心板是否发生坍塌、坠落,进而研究预制空心楼盖板HPFL整体化后平面外强度。本试验主要对HPFL作为预制空心楼盖板的叠合层,在考虑两倍动力系数的情况下,通过三种工况对整体化后楼板的平面外强度进行研究。工况一为使用黄土分四级进行加载,加载结束后进行工况二;工况二为掏空试件A轴边板下的墙体,工况三在工况二的基础上掏空试件B轴中间两块板下的墙体,A、B轴见图2.6。通过板下墙体的撤出,模拟地震作用下板下任意位置墙体的破坏,研究HPFL作为预制空心楼盖板的叠合层对整体化的拼装楼盖板平面外强度的影响。本文通过ABAQUS有限元分析程序进行模拟四块板和六块板拼装的预制空心楼盖板模型,通过有限元模型计算出来的四块板整体化后强度值与实际试验结果符合较好。有限元还通过楼板悬挑1500mm来模拟墙体大面积倒塌的拼装楼板,模拟结果显示:板与叠合层未发生剥离,且无任何空心板发生坍塌、坠落。试验结果表明,预制空心板在板下不同位置的支撑墙体破坏后,整体化后的空心楼盖板件按空心板横向悬挑板受力,板端部产生向下挠曲,空心板横向悬挑长度为2块板宽(1000mm),叠合层与任意一块空心板之间均未出现剥离现象;没有HPFL作为叠合层的空心楼板发生脆性破坏,悬挑处空心板直接坍塌坠落。该试验证明HPFL整体化后的预制空心楼盖板,能有效地提高预制空心楼盖板的整体性,板的平面外强度增加,空心楼板在水平面的两个垂直方向上连续;整体化后的预制空心楼盖板成为水平面内任意向刚度接近无穷大的横向构件,拼装的预制空心楼盖板的整体性及抗震性能得到保证。本中提出的预制空心板HPFL整体化的方法不仅可供工程设计参考,也可为广大村镇地区在新建房屋中,使用价廉物美的预制空心板作为楼盖板提供整体化施工指导,同时对已有工程选用HPFL窄条带加固预制空心板构件提出一些建议。
[Abstract]:In this paper, the high performance cement composite mortar steel mesh (HPFL) thin layer is used as the superimposed layer of the prefabricated hollow floor, and the out-of-plane strength of the prefabricated hollow floor slab is studied experimentally. The integration of HPFL for prefabricated hollow floor slab is to combine the advantages of prefabricated hollow-hole hollow slab and HPFL thin layer. By laying different width HPFL narrow strip on the board, the HPFL superimposed layer and hollow slab can be formed as a whole, so as to enhance the integrity of the floor. Furthermore, the out-of-plane strength of the slab is strengthened and the problem of poor integrity of the prefabricated hollow floor slab is overcome, which makes the HPFL prefabricated hollow floor slab become an assembly integral floor system. According to the deflection value of prefabricated hollow slab, the crack development of superimposed layer, and whether any prefabricated hollow slab collapses and falls under various working conditions, the out-of-plane strength of prefabricated hollow slab after HPFL integration is studied. In this experiment, HPFL is used as the superimposed floor of prefabricated hollow floor, and the out-of-plane strength of the whole floor is studied through three working conditions, considering the double dynamic coefficient. The first condition is to use loess to load, after loading, the second condition is to empty the wall under the edge plate of A axis, and the third condition is to empty the wall under the two plates in the middle of the B axis on the basis of condition 2. Figure 2.6 is shown in figure 2.6. The influence of HPFL as the superimposed layer of prefabricated hollow floor slab on the out-of-plane strength of the whole assembled floor slab is studied by simulating the damage of the wall at any position under the plate under the action of earthquake through the withdrawal of the wall under the board and simulating the damage of the wall at any position under the plate under the earthquake. In this paper, the prefabricated hollow floor slab model is simulated by Abaqus finite element analysis program. The strength of the four plates calculated by finite element model is in good agreement with the experimental results. The finite element method also simulates the large area collapse of the wall by 1500mm. The simulation results show that there is no peeling off between the slab and the composite layer, and no hollow slab collapses and falls. The test results show that after the failure of the supporting wall at different positions under the slab, the integral hollow floor slab is subjected to the transverse cantilever plate of the hollow slab, and the end of the plate produces a downward deflection. The transverse cantilever length of the hollow slab is 1 000 mm / L, and there is no exfoliation between the superimposed layer and any hollow slab, and the hollow slab with no HPFL as the superimposed layer has brittle failure, and the hollow slab at the cantilever directly collapses and falls down. The test proves that the prefabricated hollow floor slab after HPFL integration can effectively improve the integrity of the prefabricated hollow floor slab, the strength of the slab outside the plane increases, and the hollow floor slab is continuous in two vertical directions of the horizontal plane. The prefabricated hollow floor slab becomes a transverse member with arbitrary stiffness approaching infinity in the horizontal plane. The integrity and seismic performance of the prefabricated hollow floor slab are guaranteed. The HPFL integrated method proposed in this paper can not only be used as a reference for engineering design, but also can provide integrated construction guidance for the use of cheap prefabricated hollow slabs as floor panels in newly built houses in the vast areas of villages and towns. At the same time, some suggestions on strengthening precast hollow slabs with HPFL narrow strip are put forward.
【学位授予单位】：湖南大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU37

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