Segmented Loading Device for CECFST Creep Analysis
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Solution Overview
Problem
Existing load measurement devices for CECFST structures cannot achieve phased loading of the core concrete-filled steel tube (CFST) and the external reinforced concrete (RC) portions, limiting the study of mechanical performance under phased construction conditions.
Innovation Solution
A testing device for long-term loading and synchronized measurement of CECFST structures, which employs a two-stage loading approach to independently load and measure the CFST and RC portions, allowing for individual force analysis and creep behavior determination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional loading devices are used to load the CECFST structure as a whole, then the structure can be loaded, but phased loading of the CFST and RC portions cannot be achieved
Solution Approach 1:
The loading device is divided into two independent loading systems: a first loading device for applying load to the CFST portion and a second loading device for applying load to the RC portion. This segmentation enables phased loading of different structural components independently, allowing researchers to study the mechanical performance of each portion separately while maintaining manageable device complexity through modular design.
2Measurement precision
If conventional load measurement devices are used, then overall load can be measured, but internal forces of CFST and RC portions cannot be differentiated
Solution Approach 1:
The measurement system is segmented into independent measurement paths: load measurement devices are separately installed on the CFST and RC portions, and strain measurement devices are independently positioned on each component. This enables precise differentiation of internal forces in each portion while maintaining a systematic and organized measurement architecture that avoids excessive complexity.
Solution Approach 2:
Strain measurement devices serve as intermediaries that convert mechanical deformation into measurable signals. These devices are strategically positioned on the CFST and RC portions to capture strain data, which is then used to calculate internal forces. This intermediary approach enables precise internal force measurement without requiring direct access to the internal stress states.
3Measurement precision
If the entire CECFST structure is loaded simultaneously, then loading can be applied, but creep behavior of individual components cannot be analyzed
Solution Approach 1:
The loading operation is segmented into two independent control systems, each managing a separate loading device. This allows operators to apply loads to the CFST and RC portions independently or simultaneously, providing flexibility to study creep behavior of individual components while maintaining ease of operation through automated control systems.
4Adaptability or versatility
If phased loading is implemented, then mechanical performance under phased construction conditions can be studied, but the loading device must support independent loading of CFST and RC
Solution Approach 1:
The loading system is configured with segmented, independent loading devices that can be selectively activated. This enables the simulation of phased construction conditions where the CFST portion is loaded first, followed by the RC portion, while maintaining a relatively simple overall system architecture through modular and standardized component design.
Data Source
AI summary
The present invention provides an experimental device for the long-term loading and simultaneous measurement of a concrete-encased concrete-filled steel tube structure. The device comprises a loading component, a load measurement component, a deformation measurement component, and the concrete-encased concrete-filled steel tube structure. The loading component mainly consists of loading plates, loading rods, nuts, and pre-tightened disc springs. The load measurement component comprises force sensors. The deformation measurement component mainly consists of measurement devices. The concrete-encased concrete-filled steel tube structure serve as the load-bearing structure. By inventing the experimental device for the long-term loading and simultaneous measurement of the concrete-encased concrete-filled steel tube structure, it achieves phased loading and simultaneous measurement of internal forces and deformations of the embedded concrete filled steel tube and the external reinforced concrete. It provides reliable experimental results for further studying the redistribution of internal forces and development of deformations of such structures under long-term loading.