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
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Embodiment 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 formula for the number ...
Embodiment 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 parameter calculation
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