Computing method of secondary axis force of prestress bottom plate

Abstract

The invention discloses a computing method of a secondary axis force of a prestress bottom plate. The computing method includes 1) computing equivalent precompression Npc0 of end concrete of the bottom plate according to tension control stress and area of end prestressed reinforcing bars of the prestress bottom plate; 2) computing coefficient beta according to the thickness H and the length L of the bottom plate, the foundation horizontal resistant coefficient Cx and the concrete elastic modulus E; 3) computing the secondary axis force Nr of the prestress bottom plate, wherein the unit of the Nr is N. The computing method is used for computing the secondary axis force caused by the foundation horizontal resistance, and with the computing formula given in this method, the secondary axis force of various sections in the concrete prestress bottom plate can be conveniently computed, and sufficient reference can be provided for engineering design and computing.

Description

technical field [0001] The invention relates to the technical field of prestressed concrete structures, in particular to a method for calculating the secondary axial force of a prestressed bottom plate. Background technique [0002] Due to its unique structural form, structural system and construction method, the prestressed concrete structure cannot be replaced by other structural materials in its application fields. The main features of modern prestressed structures have changed from simple prestressed members (often simply supported members) to complex prestressed members (often statically indeterminate structures). Modern prestressed structures are widely used in towering, large span, large overhang, heavy load and complex structures, such as prestressed concrete TV towers, large storage tanks, prestressed bottom plates, pressure vessel nuclear containment, etc. [0003] "Code for Design of Concrete Structures" (GB50010-2010) (hereinafter referred to as "Code") stipulat...

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Problems solved by technology

[0004] The purpose of the present invention is to overcome the problem that the secondary axial force cannot be calculated in complex prestressed concrete structures such as the prestressed floor in the prior art, so that the influence of the secondary axial force on construction cannot be accurately predicted, and a calculation method is proposed , the technical solution adopted is: the calculation method of the secondary axial force of the prestressed floor, characterized in that: the calculation method includes the following steps:

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