Performance evaluation method for void concrete-filled steel tube member
A technology for concrete-filled steel tubes and hollowing, which is applied in the directions of instruments, geometric CAD, and electrical digital data processing, etc. It can solve the problem that the hollowing reduction coefficient is greatly affected by the fitting data, the hoop effect cannot be applied, and it is difficult to establish a universal calculation Problems such as formulas, to achieve good calculation accuracy, good effect, and convenient operation
Inactive Publication Date: 2020-07-28
GUANGXI ROAD & BRIDGE ENG GRP CO LTD
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[0009] The purpose of the present invention is: the change of the effect of the hoop cannot be applied to the current void reduction coefficient existing in the prior art, because the void reduction coefficient is greatly affected by the fitting data due to the lack of mechanism, and it is difficult to establish a universal In order to solve the problem of calculating the formula of performance, a method for evaluating the performance of concrete-filled steel tube members is provided.
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[0041] Such as Figure 1-2 As shown, a method for evaluating the performance of hollow concrete-filled steel tube members based on the hoop reduction coefficient of the present invention includes the following steps:
[0042] Step 1: Establish the hoop reduction coefficient ξ′ for the effect of voiding.
[0043] Current steel pipe confined concrete peak stress σ 0 , Section combination strength f sc , Section bending plasticity development coefficient γ m etc. are all calculated on the basis of the hoop coefficient ξ, what needs to be explained is the peak stress σ of the steel pipe-confined concrete 0 , Section combination strength f sc , Section bending plasticity development coefficient γ mDifferent scholars have also given different calculation formulas for such indicators, but the overall difference is not large. This embodiment uses the research results of Professor Han Linhai of Tsinghua University as the basis, as shown in the following formula:
[0044]
[00...
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The invention discloses a performance evaluation method for a void concrete-filled steel tube member. The method comprises the following steps: determining the combined strength fsc, t of a cross section under the influence of disengagement; determining a hoop reduction coefficient Xi'; and obtaining the relationship between the hoop reduction coefficient Xi' and the void ratio chi according to the hoop reduction coefficient Xi 'and the section combination strength fsc, t. According to the performance evaluation method for the void concrete-filled steel tube member, the influence of void on the stress performance of the concrete-filled steel tube member is reflected by establishing a hoop reduction coefficient from the influence mechanism of void; and the method is clear in logic, simple in step, convenient to operate and good in effect.
Description
technical field [0001] The invention relates to the field of steel pipe concrete members, in particular to a method for evaluating the performance of hollow steel pipe concrete members. Background technique [0002] Void is one of the common diseases of concrete filled steel tube structures. The reasons for void include insufficient concrete pouring, untimely discharge of air in the steel pipe, concrete shrinkage and temperature changes, etc. Some scholars also refer to void as debonding. The patent application uniformly refers to the phenomenon of gaps between the steel pipe and the concrete as voiding. [0003] The void reduces the synergy between the steel pipe and concrete. On the one hand, the concrete cannot provide effective support for the steel pipe, and the steel pipe is prone to buckling. On the other hand, the steel pipe cannot provide effective restraint for the concrete, which is not conducive to the improvement of concrete strength and ductility. The evaluati...
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IPC IPC(8): G06F30/13G06F119/14
Inventor 解威威韩玉王建军唐睿楷叶志权曹璐梁厚燃郑健李彩霞刘祥侯凯文李威胡以婵赵婷婷
Owner GUANGXI ROAD & BRIDGE ENG GRP CO LTD