| As a type of wall panels, composite panel is widely used in industrial and civil buildings in parts of our country because of its green, energy-saving, lightweight, economical, high strength, etc. In order to promote the popularity of composite wall in cold regions of our country, Shenyang Yuanda Group Company developed a new form of composite panels, which is called fiber cement composite panels (Fiber Cement composite Panel, hereinafter shorted as FCP).FCP composite wall is made of cement fiber board, steel keel and insulated rock wool, which effectively connected via a combine. It has such advantages as light weight, insulation resistance, fire resistance, excellent watertight and airtight superior, and more suitable for cold region. However, flexural property has not been researched of such panels. In this paper, flexural property of FCP is researched via experiment and numerical simulation, which in order to provide the experimental basis for its application in practical engineering project.In this paper,9 FCP panels were tested to research the flexural property of FCP with heap load under the consideration of boundary conditions, keel spacing, test type, and whether the open hole or not. With the use of ABAQUS to simulate the extended parameters, failure mode of wallboard, carrying capacity, deflection and crack development is researched by ABAQUS, and the following conclusion can be acquired:(1)The selected normal using load in this paper is wind load standard value(with a value of 100m height of suspend wall, ground roughness category for class D). And the selected basic wind pressure is considered as a period of 50 years. According to the results:when the load reaches the normal load, there is no damage occurring to 9 FCP composite walls; deflection of the keel of FCP 600mm pitch does not exceed the specification limit values for curtain walls. Which means that keel of FCP 600mm pitch meet the specifications for the flexural performance requirements under normal use. It can be also used in the position of 100m height of dense buildings. Instead, keel of FCP 800mm can not meet the value under normal use, so it can not be used in herein selected conditions.(2)According to the pile load experiment of 9 FCP composite walls, the stage of load increasing form zero to normal load, there is no cracks in FCP wall, self-tapping screws are not falling, and integrity of FCP wall is good; Continue to load until exceeding the normal load with a phenomenon of self-tapping screws falling off, as the load continues to increase, the speed of shedding frequency is faster and faster, the glue seam stitching of lower cement fiberboard is broken, the cracks occurred in the connection of upper cement fiberboard and keel, and then the cracks got through; When load meet the ultimate load, trial ended by the separation of lower fiberboard and the entire wall.(3)After analysis of keel spacing, boundary conditions, test type, and whether the open hole, combine with the results, the flexural property of keel of FCP 600mm pitch is 90% higher than keel of FCP 800mm pitch; FCP composite wall with a window is not that weak because of the two inner horizontal multi-keel, which improve the overall stiffness of keel, and weaken the adverse effects of window opening; the flexural property of it is 70% higher than regular FCP with no windows; the panels with multi-point connections at both side has 18% more flexural property than panels with bump slot connections,owing to sharing the negative bending moment, the carrying capacity is increased.(4)After analysis of test model of keel of 600mm pitch by ABAQUS, by contrast of displacement curves in the same point of finite element simulation, followings can be find that in the scale of elastic, the test results are in good agreement with the finite element analysis. But when the load exceeds normal load, it is a little different due to the simplification of self-tapping screws, which pretermit the connection to be permanent. According to the numerical simulation of expand parameters by ABAQUS, the constrains capacity of keel is weakened due to the pitch increasing under the same load; according to the stress cloud of cement fiberboard, the maximum stress diffusion range is more reasonable when the keel spacing is less than 700mm.(5)Following results can be found by using ABAQUS finite simulation to simulate the uniform load of standard slat and single keel of FCP with 300mm pitch keel:cement fiberboard can effectively limit the overall instability phenomenon of keel. According to the finite simulation of 80mm and 120mm web height FCP composite panels with uniform load, the 120mm web height panel is 102% higher of ultimate bearing capacity,82% higher of linear segments stiffness. So, in order to use the keel of FCP 800mm pitch panel under selected conditions herein, the web height can be improved suitably. |
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