Calculation method of bending stiffness of prefabricated reinforced concrete floor in construction stage
A technology for reinforced concrete slabs and reinforced concrete, which is used in calculations, special data processing applications, instruments, etc., and can solve problems such as difficulty in calculating total bending stiffness values.
Active Publication Date: 2018-02-06
西安建构实业有限责任公司
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[0009] The purpose of the present invention is to provide a method for calculating the flexural stiffness of the prefabricated reinforced concrete floor in the construction stage, so as to solve the problem that the total flexural stiffness value of the prefabricated reinforced concrete floor with complex materials and components is difficult to calculate in the construction stage
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[0078] Calculate when the total bending moment (including self-weight) of the prefabricated reinforced concrete floor reaches M 总 = Total bending stiffness K value at 2.5KN·m;
[0079] The calculated span l of the reinforced concrete slab in the prefabricated reinforced concrete floor is known 0 =2.4m, the concrete grade is C30, f tk The value is 2.01N / mm 2 ; The thickness of the reinforced concrete slab h = 65mm, calculate the thickness h 0 =46mm, area A of tensile reinforcement S =251mm 2 , the calculated width of the reinforced concrete slab b = 1m, the diameter of the top reinforcement of the truss reinforcement D 1 =8mm, bottom rib diameter D 2 =8mm, the diameter of the abdominal tendon is D 3 =6mm, the distance h between the center of the top rib and the bottom rib 1 = 72mm, truss bar spacing d = 600mm, all steel bars used are HRB400 type. E. S =200000N / mm 2 ,E C =30000N / mm 2 , ρ=0.386%;
[0080] Step 1. Set the dead load value S shared by the reinforced ...
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The invention discloses a calculation method of the bending stiffness of a prefabricated reinforced concrete floor in a construction stage. The calculation method comprises the steps of setting a constant load value SG and a live load value SQ shared by reinforced concrete slabs in the prefabricated reinforced concrete floor, calculating a bending moment value M1 and a short-term bending stiffnessK1 shared by the reinforced concrete slabs, calculating a bending stiffness K2 of a reinforced truss on the prefabricated reinforced concrete floor during an elastic phase, calculating a bending moment value M2 of the reinforced truss according to the K2, wherein the total bending moment M of the prefabricated reinforced concrete floor satisfies M=M1+M2, and the total bending stiffness of the prefabricated reinforced concrete slabs satisfies K=K1+K2 under the effect of M, and continuously adjusting the values of SG and SQ until the value of M equals to the target total value M. Then the total bending stiffness value of the prefabricated reinforced concrete floor under the effect of the total bending moment M can be obtained. The calculation method of the bending stiffness of the prefabricated reinforced concrete floor in the construction stage solves the problem that the total bending stiffness of the prefabricated reinforced concrete floor with complex materials and components in the construction stage is difficult to calculate.
Description
technical field [0001] The invention belongs to the technical field of calculation methods for the performance of prefabricated building facilities, and relates to a calculation method for bending stiffness of a prefabricated reinforced concrete floor during construction. Background technique [0002] With the wide-scale promotion and application of prefabricated concrete structures, reinforced truss laminated slabs have been used more and more. The bottom slab has truss reinforcement, which can provide good flexural rigidity for the prefabricated reinforced concrete bottom slab. The force of the prefabricated reinforced concrete bottom slab during the whole use process belongs to two stages of force: the first stage is the construction stage, the bottom slab bears its own weight and construction activities. Load; the second stage is the normal use stage. At this time, the prefabricated reinforced concrete floor has formed a whole with the post-cast concrete to bear its own ...
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Login to View More IPC IPC(8): G06F17/50
CPCG06F30/13
Inventor 刘浩强吴志坤王立权浩吕荣
Owner 西安建构实业有限责任公司