A Calculation Method of Bending Stiffness of Prefabricated Reinforced Concrete Floor During Construction Stage
A reinforced concrete slab, reinforced concrete technology, applied in geometric CAD, special data processing applications, etc., can solve the problem of difficult calculation of total bending stiffness value
Active Publication Date: 2021-01-29
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 method for calculating the flexural stiffness of a prefabricated reinforced concrete floor in the construction stage. First, the dead load value S shared by the reinforced concrete slab in the prefabricated reinforced concrete floor is set. G and live load value S Q , to calculate the bending moment value M shared by the reinforced concrete slab 1 and short-term bending stiffness K 1 ; Calculate the bending stiffness K of the steel truss on the prefabricated reinforced concrete floor in the elastic stage 2 , according to K 2 Calculate the Bending Moment M of the Reinforced Truss 2 , then the total bending moment value of the prefabricated reinforced concrete floor M=M 1 +M 2 , the prefabricated reinforced concrete floor under the action of M, the total bending stiffness K=K 1 +K 2 ; By continuously adjusting S G and S Q value until the M value is equal to the target value M 总 , at this time the bending moment value M can be obtained 总 The overall bending stiffness value of the prefabricated reinforced concrete bottom slab under action; the invention solves the problem that the total bending stiffness value of the prefabricated reinforced concrete bottom slab with complex materials and components is difficult to calculate in the construction stage.
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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IPC IPC(8): G06F30/13
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