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Method for calculating flexural capacity of section beam under action of hogging moment

A calculation method and bearing capacity technology, applied in design optimization/simulation, instrumentation, electrical digital data processing, etc., can solve problems that do not conform to reality

Pending Publication Date: 2020-04-10
JIANGNAN UNIV
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Problems solved by technology

However, this method believes that if the axial pressure is less than the bearing capacity of concrete, all of it will be borne by the concrete part; otherwise, the remaining part will be borne by the steel pipe. This model of concrete bearing priority may not be realistic

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  • Method for calculating flexural capacity of section beam under action of hogging moment
  • Method for calculating flexural capacity of section beam under action of hogging moment
  • Method for calculating flexural capacity of section beam under action of hogging moment

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[0041]A method for calculating the flexural bearing capacity of cross-section beams under the action of negative bending moments. First, the specimens are designed; in order to study the mechanical performance of carapace beams under the action of negative bending moments, two / 5 scaled specimens were tested for flexural capacity. In the test, the influence of the thickness of the bottom plate on the flexural stiffness and flexural capacity of the carapace girder under negative bending moment is mainly considered. A total of 2 composite beam specimens are designed, both of which are subjected to negative bending moments, and the numbers are L b -1, L b -2, the span is uniformly taken as 3.6m, and the beam width is 200mm. L b For the convenience of the test, the specimens were loaded upside down. Considering that the tension of the concrete floor has little effect on the flexural bearing capacity of the composite beam when inverted, the width of the flange flange of the spec...

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Abstract

The invention discloses a method for calculating the flexural capacity of a section beam under the action of hogging moment. The method comprises the following steps: judging the position of a sectionneutralizing shaft when a complete shear connection novel section composite beam reaches a bearing capacity limit state under the action of the hogging moment; substituting the position of the neutralizing shaft into a corresponding formula to solve a ultimate flexural capacity, wherein section stress distribution of a plastic neutralizing shaft in a corrugated side plate meets a formula, namelyfpyAp + 2fybutu + fysAs (1) is no more than fybdtd + alpha1fc(b-hr)beta1(ha-td-tu); and calculating the height x of a concrete equivalent compression area according to force balance, and taking a moment of a concrete equivalent rectangular resultant force point of a compression area according to an equation, namely fpyAp + 2pybutu + fysAs = fybdtd + a1fc(b-hr)x(2a) so as to obtain an ultimate flexural capacity Mu of the section beam.

Description

technical field [0001] The invention relates to a calculation method for the flexural bearing capacity of a composite beam, in particular to a calculation method for the flexural bearing capacity of a section beam under the action of a negative bending moment. Background technique [0002] In order to actively respond to the application and development of prefabricated structures promoted by the country in the construction industry, the report proposes a prefabricated structural beam body: carapace beam, such as figure 1 shown. The beam side web is made of corrugated steel and is welded to the bottom and top steel plates. The top plates on both sides are connected by C-shaped steel to restrain the steel plates on both sides and enhance the restraint of the side webs on the concrete. In addition, concrete is filled inside the beam, and prestressed steel strands are stretched by post-tensioning to enhance the bending resistance of the beam. Stiffeners can be arranged at a q...

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Application Information

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IPC IPC(8): G06F30/13G06F30/23G06F119/14
Inventor 邹昀郑申鸽钱慧超王城泉吴艺超
Owner JIANGNAN UNIV
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