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Bearing capacity design method for prestressed concrete structure

A concrete structure and design method technology, applied in truss structures, calculations, special data processing applications, etc., can solve the problems that it is difficult to determine the influence of columns, walls, and tubes on the design and calculation results

Active Publication Date: 2015-03-11
HARBIN INST OF TECH
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  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to solve the problem that it is difficult to determine the influence of the confinement structures such as columns, walls, tubes on the prestressed concrete structure and the influence on the design and calculation results in the existing design method of the statically indeterminate prestressed concrete structure , and propose a bearing capacity design method for prestressed concrete structures

Method used

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  • Bearing capacity design method for prestressed concrete structure
  • Bearing capacity design method for prestressed concrete structure
  • Bearing capacity design method for prestressed concrete structure

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specific Embodiment approach 1

[0040] The bearing capacity design method of the prestressed concrete structure of the present embodiment, the bearing capacity design method of the prestressed concrete structure is realized through the following steps:

[0041] Step 1: Judging the concrete structure, if the concrete structure is determined to be a concrete structure with an infinite side structure, then perform steps 2 to 6, and if the concrete structure is determined to be a concrete structure with a limited side structure, then perform Calculations from Step 2 to Step 7;

[0042] Step 2: Calculate the cross-sectional area A of the longitudinal prestressed tendon in the tension zone p ;

[0043] Step 3: Determine the bending moment value M of the control section under the end preload caused by the tensioned prestressed tendon and the equivalent load in the span p , and determine the design value M of the external load and bending moment of the control section load , so as to calculate the sum of the bend...

specific Embodiment approach 2

[0069] The difference from Embodiment 1 is that in the method for designing the bearing capacity of prestressed concrete structures in this embodiment, the cross-sectional area A of the longitudinal prestressed tendons in the tension zone described in step 2 p The specific determination method:

[0070] First, determine the thickness of the prestressed tendon protective layer according to the construction code, and determine the line shape of the prestressed tendon according to the load type;

[0071] Then, the cross-sectional area A of the prestressed tendon is determined by calculating the crack governing equation p1 , and then calculate and determine the cross-sectional area A of the prestressed tendon through the deformation control equation p2 , take the cross-sectional area A of the prestressed tendon p1 and the cross-sectional area A of the prestressing tendons p2 The larger of the two is used as the cross-sectional area A of the prestressed tendon p .

specific Embodiment approach 3

[0072] The difference from the specific embodiment 1 or 2 is that in the design method of the bearing capacity of the prestressed concrete structure in this embodiment, the concrete structure of the limited side structure described in step 7 is a prestressed concrete frame structure, a prestressed concrete slab-column structure, Vertical member of prestressed concrete high-rise structure - one of column, shear wall and cylinder.

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Abstract

The invention discloses a bearing capacity design method for a prestressed concrete structure. The existing design method for a statically indeterminate prestressed concrete structure has the problems of the influence on the transfer of the prestressed concrete structure and on design calculation results caused by lateral confinement structures, such as a post, a wall and a cylinder. The bearing capacity design method for the prestressed concrete structure comprises the following steps of distinguishing the concrete structure of an unconfined lateral structure from a concrete structure of a confined structure, and introducing a lateral confinement influence coefficient; calculating the cross-sectional area of a longitudinal prestressed tendon in a tensioned area; determining the sum of a bending moment value caused by tensioning the prestressed tendon and the designed bending moment value of a control cross section external load; establishing effective prestress tensioned to the prestressed tendon; passively providing resisting force by the part, higher than the effective prestress, of the designed tensile strength value of the prestressed tendon; calculating normal section bearing capacity of a prestressed concrete flexural component with a rectangular section of the unconfined lateral structure; introducing the lateral confinement influence coefficient for modifying to obtain a calculation formula for the normal section bearing capacity of the prestressed concrete flexural component with the rectangular section of the confined lateral structure. The bearing capacity design method is applied to the bearing capacity design of the prestressed concrete structure.

Description

technical field [0001] The invention relates to a bearing capacity design method of a prestressed concrete structure. Background technique [0002] Most of the prestressed concrete structures in building construction are statically determinate prestressed concrete structures, and the existing methods for the design of superstatic prestressed concrete structures have introduced the concepts of main internal force, comprehensive internal force and secondary internal force, and there are calculation theories Abstract, not easy for engineers and technicians to grasp. This design method of statically indeterminate prestressed concrete structures based on the working principle of continuous beams is difficult to determine the influence of the confinement structures such as columns, walls, and tubes on the transmission of prestressed concrete structures and the influence of design calculation results on construction projects. cause safety hazards. Contents of the invention [0...

Claims

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Application Information

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IPC IPC(8): G06F17/50G06F19/00E04C3/26
Inventor 郑文忠王英周威
Owner HARBIN INST OF TECH
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