Tension control method in anti-seismic design of shear wall

Abstract

The invention discloses a tension control method in anti-seismic design of a shear wall. Calculation of effective tension of a wall body under a medium earthquake and a large earthquake is divided into two stages; the first stage is a stage before nominal tension stress reaches a concrete tensile strength standard value ftk, and the tension in the wall body at the stage is completely borne by steel after concrete cracks; the second stage is a stage after the nominal tensile stress exceeds a concrete tensile strength standard value ftk, and the newly increased tensile force in the stage is completely borne by the steel after being reduced by considering rigidity degradation and internal force redistribution; and the newly increased tension in the second stage is calculated according to a deformation demand principle. According to the scheme, internal force redistribution after shear wall concrete is pulled and cracked is considered, the steel plate stress control principle related to deformation requirements is established, reasonable tension control over the shear wall under frequent earthquakes, fortified earthquakes and rare earthquakes is achieved, and on the premise that safetyis guaranteed, the use amount of steel is remarkably reduced.

Description

technical field [0001] The invention relates to the anti-seismic technology of building structures, in particular to a scheme for determining the tensile force of the shear wall in the tensile design of the shear wall in the anti-seismic design of the building structure. Background technique [0002] Document Jianzhi [2015] No. 67 in the "Technical Points for Special Review of Seismic Fortification of Oversized High-rise Buildings" stipulates: "The average nominal tensile stress of the full section of the wall pier under the two-way horizontal earthquake caused by the axial force exceeds the tensile strength of the concrete during a moderate earthquake. When the standard value is set, the section steel should be set to bear the tensile force, and the average nominal tensile stress should not exceed twice the standard value of the concrete tensile strength (the effect of section steel and steel plate can be considered in conversion according to the elastic modulus), and the st...

AI Technical Summary

Problems solved by technology

[0003]According to this requirement, in super high-rise structures in some high-intensity areas, a large amount of section steel is often added due to the large nominal tensile stress of the wall piers, resulting in structural costs Significantly increased

[0004]The control of the tensile stress of reinforced concrete shear walls under earthquake action has always been the focus of discussion in this field. There have been many discussions, but no generally accepted views and practices have been formed

And the whole process does not consider the internal force redistribution after the structural stiffness degradation

In such cases, the demand for the resulting sections tends to be severely overstated

Images