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A Method of Controlling Cracks in Composite Shear Wall Using Prestress

A combination shear wall and control combination technology, applied in the processing of walls, building materials, construction, etc., can solve the problems of inability to accurately determine the best timing and degree of prestressing prestressing construction, etc., to achieve Reduce blindness, avoid more cracks, prevent and control the effect of temperature cracks

Active Publication Date: 2021-06-15
BEIJING FOURTH CONSTR & ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to provide a composite shear wall and its construction method for controlling cracks in the wall, to solve the problem that the traditional construction method cannot accurately determine the best time to apply prestress and the degree of prestress and the existence of prestress construction. Technical problems with greater blindness

Method used

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  • A Method of Controlling Cracks in Composite Shear Wall Using Prestress
  • A Method of Controlling Cracks in Composite Shear Wall Using Prestress
  • A Method of Controlling Cracks in Composite Shear Wall Using Prestress

Examples

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Embodiment 1

[0094] Example 1: According to the test data and calculation results, the temperature-stress-time curve and the crack-resistant strength-time curve of the wall panel concrete 5 are made, and the timing of applying prestress is determined according to the characteristic points on the curve.

[0095] For a composite shear wall, concrete with a strength grade of C60 is used, and the amount of fly ash and mineral powder in the concrete are both 20%, and the corresponding elastic modulus adjustment coefficients are respectively β 1 =0.99,β 2 =1.02, the standard value of tensile strength at 28d age measured by the test f tk =2.85×10 4 MPa, elastic modulus E at 28d age 0 =3.60×10 4 MPa, steel linear expansion coefficient α s =1.383×10 -5 , concrete linear expansion coefficient α c =1.025×10 -5 .

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Abstract

A method for controlling cracks in composite shear walls using prestress, comprising steps as follows: step 1, determining the size of the control stress that needs to be applied according to the comprehensive maximum stress and crack control grade requirements of composite shear walls obtained in design calculations; Two, construct the composite shear wall; step three, determine the time to apply prestress to the wall according to the temperature stress and the dynamic change of the crack strength of the wall concrete; step four, determine the method of prestress application: prestress application The preferred method is the primary tensioning method or the secondary tensioning method; Step 5, stretching the prestressed tendons and anchoring them with anchors. The invention solves the technical problems that the traditional construction method cannot accurately determine the optimal timing and degree of applying prestress and the blindness of prestress construction.

Description

technical field [0001] The invention belongs to the field of construction engineering, in particular to a method for controlling cracks in composite shear walls by using prestress. Background technique [0002] In recent years, steel plate-concrete composite shear walls have been widely used in super high-rise buildings due to their high bearing capacity and good seismic performance. Loss, resulting in excessive temperature difference between the inside and outside of the wall, coupled with concrete shrinkage, large external constraints and other reasons can easily lead to serious early cracks, endangering the safety and durability of buildings. Effective way to crack. Contents of the invention [0003] The purpose of the present invention is to provide a composite shear wall and its construction method for controlling cracks in the wall, to solve the problem that the traditional construction method cannot accurately determine the best time to apply prestress and the degr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E04B2/84E04G21/12
CPCE04B2/84E04G21/12
Inventor 汪潇驹张进红张莉莉宋小软李素霞马骏张雪斌
Owner BEIJING FOURTH CONSTR & ENG