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Cable body blanking length calculation method considering influence of cable structure node area
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A calculation method and technology of area length, applied in the structural design and processing of construction engineering, construction engineering, and installation fields, can solve problems such as the inability to meet the construction control principle of cable structure, and achieve the effect of simple and clear calculation process and clear concept.
Active Publication Date: 2020-09-01
BEIJING INST OF ARCHITECTURAL DESIGN
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Problems solved by technology
Due to the actual blanking, it is not necessarily possible to press the cable body to the initial state of the cable force F 2 The loading conditions, that is, the cable body may be in the stress-free state, the initial strain ε 1 Corresponding tension F 1 =EAε 1 Even under other tensile forces, the current technology usually cannot meet the control principles of cable structure construction
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Embodiment 1
[0093] In this embodiment, for a cable member, the present invention is described by taking blanking without stress as an example.
[0094] When using stress-free cutting, the cutting cable force 7 is equal to 0, that is, F M =0. By the present invention, the cable body blanking length 6 of the cable member can be obtained as
[0095]
[0096] Follow F M =0 and L in the above formula CM The unloaded cable body, in the initial state the cable force F 2 The length below is:
[0097] L CM '= L CM (1+F 2 / EA)=L 2 -L N
[0098] L CM ’ plus L N after L CM '+L N =L 2 , to meet the construction control principle.
Embodiment 2
[0100] In this embodiment, the present invention is described by taking blanking in zero state as an example for a cable member.
[0101] When using zero state blanking, the blanking cable force 7 is equal to EAε 1 , namely F M =EAε 1 , where ε 1 is the initial strain of the member corresponding to the cable element in the theoretical model. By the present invention, the cable body blanking length 6 that can obtain cable member is:
[0102]
[0103] Follow F M =EAε 1 and L in the above formula CM The unloaded cable body, in the initial state the cable force F 2 The length below is:
[0104]
[0105] L CM ’ plus L N after L CM '+L N =L 2 , to meet the construction control principle.
Embodiment 3
[0107] In this embodiment, for a cable member, the present invention is described by taking blanking in the initial state as an example.
[0108] When the initial state blanking is used, the blanking cable force 7 is equal to F 2 , namely F M =F 2 . By the present invention, the cable body blanking length 6 that can obtain cable member is:
[0109]
[0110] Follow F M =F 2 and L in the above formula CM The unloaded cable body, in the initial state the cable force F 2 under the length L CM ’ is still L CM , so there is L CM '+L N =L 2 , to meet the construction control principle.
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Abstract
The invention relates to the technical field of constructional engineering, in particular to the technical field of structural design, machining and installation of constructional engineering, and particularly relates to a cable body blanking length calculation method considering the influence of a cable structure node area. The method is universally used for calculating the blanking length of thecable body when the blanking cable force is arbitrarily given, so that the blanking of the cable member is not limited to three blanking modes in the prior art; discharging is conducted according tothe method, the sum of the length of the cable body under the action of the cable force in the initial state and the length of the node area is strictly equal to the length of the cable unit in the theoretical model, and therefore the influence of the node area on the cable body discharging precision is completely eliminated, and the tensioned component state is consistent with the initial state of the theoretical model; the calculation process is simple and clear, and the concept is clear.
Description
technical field [0001] The invention relates to the technical field of construction engineering, in particular to the technical field of structural design, processing and installation of construction engineering, and in particular to a method for calculating the cutting length of a cable body considering the influence of the node area of the cable structure. Background technique [0002] The cable structure is a kind of structure composed of cable members that can only be tensioned and bar members that can be both tensioned and compressed. The cable member refers to the stressed aggregate composed of the cable body and the end node area. Common cable structure forms include single-layer cable net, cable truss structure, cable dome structure, etc. Such structures need to be prestressed to achieve a stable state, thereby forming stiffness and establishing bearing capacity. Since the cable body is made of high-strength materials, and the cable members are always in tension du...
Claims
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