Method for calculating limit stress increment of external prestressing reinforced variable cross-section continuous rigid framework

A technology of external prestressing and ultimate stress, which is applied in complex mathematical operations, design optimization/simulation, special data processing applications, etc., can solve problems such as inapplicability, and achieve simple form, good applicability, high calculation efficiency and accuracy Effect

Pending Publication Date: 2022-06-24
SHANXI UNIV
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Problems solved by technology

[0006] Aiming at the problem that the above standard formula is not applicable to the calculation of ultimate stress increment of continuous rigid frame with variable cross-section strengthened by external prestress, the

Method used

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  • Method for calculating limit stress increment of external prestressing reinforced variable cross-section continuous rigid framework
  • Method for calculating limit stress increment of external prestressing reinforced variable cross-section continuous rigid framework
  • Method for calculating limit stress increment of external prestressing reinforced variable cross-section continuous rigid framework

Examples

Experimental program
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Example Embodiment

[0058] Example 1

[0059] A calculation method for ultimate stress increment of continuous rigid frame with variable cross-section strengthened by external prestress

[0060] 1. Correction of the number of plastic hinges

[0061] The number of plastic hinges in the limit state of the externally prestressed continuous rigid frame with variable section is closely related to the failure mode of the reinforced system. The specification formula uses the formula 1+N s / 2 means, where N s The value of is n-1 for continuous beams (n is the number of spans of continuous beams). This method of value selection is based on the premise that the continuous beam has an ideal failure mode, and does not consider the actual failure mode of the structure. Relevant studies show that the number of plastic hinges in the limit state of continuous beams is calculated by using the normative formula. When the number of continuous beam spans is 2 to 3 spans, the calculation result of the normative for...

Example Embodiment

[0095] Example 2

[0096]In order to verify the correctness and applicability of formula (12) for the calculation of the ultimate stress of external beams of the variable-section continuous rigid frame reinforcement system, the following three supporting projects are used as calculation examples in this embodiment, and the design parameters of each calculation example are shown in Table 2.

[0097] Table 2 Design parameters of the example

[0098]

[0099] Formula (12) is used to calculate the ultimate stress increment of the external beam in the mid-span section of the above three calculation examples. Taking calculation example 1 as an example, the calculation process of formula (12) is introduced in detail.

[0100] (1) Section equivalent

[0101] The mid-span box section of the reinforcement system is converted into an I-shaped section according to the equivalent principle. The converted I-shaped section size is as follows: Figure 5 shown.

[0102] (2) formula param...

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Abstract

The invention discloses a method for calculating limit stress increment of an external prestressing reinforcement variable cross-section continuous rigid frame. According to the method, a continuous rigid frame structure system is considered, and an actual damage mode of a continuous beam reinforcing system in a limit state is used for reference, so that the number of plastic hinges in the limit state of the variable-cross-section continuous rigid frame reinforcing system and a plastic hinge corner when a middle fulcrum cross section fails are corrected on the basis of a standard formula; the finally obtained formula has good applicability to the calculation of the external beam limit stress of the variable cross-section continuous rigid frame, the maximum error of the calculation result is within 10%, the engineering calculation precision requirement can be met, and the calculation result enables the structural design to be safe. Meanwhile, the calculation formula has the advantages of being simple in form, high in calculation efficiency and precision, convenient to apply by engineering technicians and the like, and beneficial reference can be provided for the design of the external prestressing reinforcement variable cross-section continuous rigid framework.

Description

technical field [0001] The invention relates to the calculation of limit stress increments, in particular to a calculation method of limit stress increments of external prestressed reinforced variable-section continuous rigid structures. Background technique [0002] Existing studies have shown that the calculation formula for the ultimate stress of external beams in "Code for Design of Highway Bridge Reinforcement" (JTG / T J22-2008) (hereinafter referred to as the specification formula) has better performance for externally prestressed reinforcement simply supported beams and continuous beams of equal section. The calculation accuracy can be used for the calculation of the ultimate stress of the external beam of the above two bridge structural systems, but for the variable-section continuous rigid-frame bridge, the three aspects of the structural failure form, the main beam section form and the bridge structural system are all consistent with the continuous There are signifi...

Claims

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Application Information

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IPC IPC(8): G06F30/13G06F30/20G06F17/10G06F119/14
CPCG06F30/13G06F30/20G06F17/10G06F2119/14
Inventor 骆佐龙苗建宝石雄伟
Owner SHANXI UNIV
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