Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Optimized design method for section of multi-rib type T-shaped beam bridge

An optimized design, T-shaped beam technology, applied in calculation, special data processing applications, instruments, etc., can solve the problems of overall stiffness reduction, excessive down deflection, flange and web cracking, etc.

Inactive Publication Date: 2015-11-11
YANCHENG INST OF TECH
View PDF2 Cites 4 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the static analysis of multi-rib T-shaped beams, scholars at home and abroad have carried out unremitting analysis and research, but the existing literature has not considered the shear lag effect, shear lag warping stress self-balance condition and Timoshenko at the same time. The influence of factors such as shear deformation makes its static analysis have certain limitations. Of course, this will directly affect the accurate design of the cross-sectional size of this type of structure. Decreased stiffness and excessive deflection will seriously threaten the safety of this type of structure

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Optimized design method for section of multi-rib type T-shaped beam bridge
  • Optimized design method for section of multi-rib type T-shaped beam bridge
  • Optimized design method for section of multi-rib type T-shaped beam bridge

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0063] For multi-ribbed T-shaped beams, the material parameters and geometric parameters are E=3.5×10 4 MPa; G=1.5×10 4 MPa, the original design flange length is b 1 = 1.75m; b 2 =2.25m; b 3 = 3.75m; t 1 = t 2 = t 3 =0.3m, the thickness of ribs is t w =0.25m, the beam height is h=1.5m. The concentrated force P in static analysis k1 (z)=147000N, uniform force q k2 (z) = 14700 N / m.

[0064] The calculation method of stress and displacement change of multi-rib T-beam is as follows:

[0065] (1) Refer to figure 2 As shown, when n=3, according to the variational principle, the differential equation and natural boundary conditions of the multi-ribbed T-beam are:

[0066] Differential equation:

[0067] EIθ”+EI s1 u 1 "+EI s2 U' 2 '+EI s3 u 3 "-kGA(θ-w')=0(17)

[0068] EI s1 θ"+EI t1 u 1 "-Gk x1 u 1 +EI a1 U' 2 '+EI a2 U' 3 '=0(18)

[0069] EI s2 θ"+EI a1 u 1 "+EI t2 U' 2 '-Gk x2 u 2 +EI a3 u 3 "=0(19)

[0070] EI s3 θ"+EI a2 u 1 "+EI a3 U...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses an optimized design method for the section of a multi-rib type T-shaped beam bridge. The optimized design method includes the steps that a governing differential equation and the natural boundary condition of the multi-rib type T-shaped beam bridge are built on the basis of the principle of minimum potential energy, influences of factors such as the shear-lag effect, the shear-lag warping stress self-equilibrium condition and Timoshenko shear deformation of the multi-rib type beam bridge are comprehensively considered to carry out fine mechanical analysis on the structure, and then the reasonable size of the section is selected to enable the multi-rib type beam bridge to be in the good mechanical state. According to the optimized design method, the mechanical analysis is more accurate, bad diseases such as beam cracks and rigidity reduction can be easily avoided accordingly, and the safety performance of the multi-rib type beam bridge is improved. The optimized design method is clear in mechanical concept and simple in calculation, the multi-rib type beam bridge is in the good operation state, and therefore the good application value is achieved.

Description

technical field [0001] The invention relates to the optimization of the geometric section of a prestressed concrete or reinforced concrete multi-rib beam bridge, in particular to an optimal design method for the section of a multi-rib T-shaped beam bridge. Background technique [0002] In civil engineering, multi-rib girder bridges have both the mechanical properties of T-girder bridges and box girder bridges, and because of their many advantages in manufacturing, structural performance and appearance, they are often used in prestressed concrete with medium spans. or reinforced concrete bridges. In the static analysis of multi-rib T-shaped beams, scholars at home and abroad have carried out unremitting analysis and research, but the existing literature has not considered the shear lag effect, shear lag warping stress self-balance condition and Timoshenko at the same time. The influence of factors such as shear deformation makes its static analysis have certain limitations. ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): G06F17/50
Inventor 甘亚南石飞停
Owner YANCHENG INST OF TECH
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com