scholarly journals Ultra high performance concrete shear walls

2021 ◽  
Vol 294 ◽  
pp. 04004
Author(s):  
YiChen Fang
Keyword(s):  
Finite Element ◽  
High Performance ◽  
High Performance Concrete ◽  
Shear Walls ◽  
Element Model ◽  
Current Status ◽  
Ultra High Performance Concrete ◽  
Element Analysis ◽  
Shear Bearing Capacity ◽  
Load Displacement

The history of the development of Ultra-High Performance Concrete (UHPC) shear walls and the current status of today’s research as well as the future development prospects are comprehensively collated. The analysis process and conclusive results of the present-day domestic and international research on UHPC shear walls are highlighted. The load displacement curves, hysteresis curves and skeleton lines of ultra-high performance concrete shear walls under different experimental loads are collated and compared. Integrate the corresponding equations for shear bearing capacity and equations for the overall specimen load displacement curves. A finite element model of the ultra-high performance concrete shear wall is established to simulate and perform non-linear finite element analysis of its force process under unidirectional horizontal loading.

Behavior of ultra-high-performance concrete columns subjected to axial compressive load

2021 ◽  
pp. 136943322110384
Author(s):  
Kaize Ma ◽  
Yudong Ma ◽  
Guohua Xing ◽  
Boquan Liu
Keyword(s):  
Constitutive Model ◽  
High Performance ◽  
Steel Fiber ◽  
High Performance Concrete ◽  
Compressive Load ◽  
Ultra High Performance Concrete ◽  
Fiber Volume ◽  
Element Analysis ◽  
Plastic Damage ◽  
Load Displacement

A constitutive model of confined ultra-high-performance concrete (UHPC) was developed based on the theoretical and regression analyses. This constitutive model could be applied to finite element analysis (FEA) according to the comparison of plastic damage analysis and load–displacement curves. A total of 25 stirrup-confined UHPC columns were created through FEA modeling. The variables included stirrup spacing, stirrup configuration, steel fiber volume, and longitudinal reinforcement ratio. The load–displacement curves and the plastic damage region of the UHPC columns were illustrated and analyzed. Moreover, parametric analysis was conducted to evaluate the effects of the aforementioned parameters. The improvement in the bearing capacity and ductility of the UHPC columns resulting from the reduction in stirrup spacing and increase in steel fiber volume indicated that the columns were significantly influenced by the stirrup spacing, stirrup configuration, and steel fiber volume.

Finite Element Analysis for Static Behaviour of the CNC Turning Machine Spindle

2014 ◽  
Vol 555 ◽  
pp. 555-560 ◽  
Author(s):  
Doru Bardac ◽  
Constantin Dogariu
Keyword(s):  
Finite Element ◽  
Machine Tool ◽  
High Speed ◽  
High Performance ◽  
Element Model ◽  
Design Activity ◽  
Element Analysis ◽  
Spindle System ◽  
Machine Spindle ◽  
Main Spindle

This paper presents a method to investigate the characteristics of a turning high-speed spindle system. The geometric quality of high-precision parts is highly dependent on the performance of the entire machining system,especially by the main spindle behaviour. The machine tool main spindle units is focused on direct driven spindle units for high-speed and high performance cutting. This paper analyzes the static behavior for a turning machine spindle and presents some activities to improve the CAD model for such complex systems. The proposed models take into account the spindle with the detailed bearing system. The analysis was performed during the design activity and was based on Finite Elements Method. Starting from the 3D designed model, using FEM done by means of ANSYS analysis the structure stiffness was evaluated and, by consequence, the influence on the machine tool precision. The aim of this paper is to develop a finite element model of the machine spindle system and to use this method for design optimization. The 3D model was designed using the SolidWorks CAD software. The static analysis was completed by modal, harmonic response and thermal analysis, but their results will be presented in other papers.

Enhancing Resiliency and Delivery of Bridge Elements using Ultra-High Performance Concrete as Formwork

2019 ◽  
Vol 2673 (5) ◽  
pp. 443-453 ◽  
Author(s):  
Atorod Azizinamini ◽  
Sheharyar Rehmat ◽  
Amir Sadeghnejad
Keyword(s):  
Test Specimen ◽  
High Performance ◽  
High Performance Concrete ◽  
Numerical Study ◽  
Concrete Specimen ◽  
Point Load ◽  
Ultra High Performance Concrete ◽  
Normal Concrete ◽  
Element Analysis ◽  
Normal Strength

A feasibility study of the use of ultra-high performance concrete (UHPC) shell as a formwork is presented. The core concept of the research, developed by the first author, is prefabrication of UHPC shell which acts as a stay-in-place formwork. In the proposed approach, after transporting the UHPC shell to site, the construction of structural elements is completed by placing reinforcing cage inside the UHPC shell and post-pouring with normal concrete. The superior properties of UHPC provide excellent means to enhance the service life of bridge elements, while eliminating the need for assembling or stripping of formwork. As a proof of concept, a combination of experimental and numerical studies was conducted, results of which are reported here. Before conducting experimental work, numerical study in the form of finite element analysis was carried out to investigate performance of shell during placement of the normal concrete. To provide a baseline comparison between UHPC shell formwork and conventional methods, two test specimens were constructed and tested under three-point load setup. The shell test specimen demonstrated flexural strength, 14% greater than an equivalent normal strength concrete specimen. The UHPC shell test specimen failure occurred by debonding of shell at the interface and development of a large crack in the shell. The shell test specimen exhibited improved levels of ductility before failure. The preliminary analysis demonstrated that the idea is feasible and useful for accelerated bridge construction applications.

Nonlinear Finite Element Analysis of Adaptive-Slit Shear Walls

2013 ◽  
Vol 275-277 ◽  
pp. 1207-1211
Author(s):  
Ying Ying Yin ◽  
Ming Jin Chu
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Experimental Studies ◽  
Shear Walls ◽  
Element Model ◽  
Finite Model ◽  
Test Results ◽  
Element Analysis ◽  
Practical Engineering ◽  
Monotonic Loads

In order to further study the mechanism of adaptive-slit shear walls under horizontal loads, and facilitate it better applied to practical engineering. On the basis of experimental studies, the ABAQUS finite element analysis software is used to establish the finite model of adaptive-slit shear. The finite element model accuracy is verified by comparing the model and test results. A validated model is used to study the mechanical property of adaptive-slit shear walls under monotonic loads.

Finite Element Analysis of External Prestressing Beams Made of Strain Hardening Material

2012 ◽  
Vol 166-169 ◽  
pp. 259-268 ◽  
Author(s):  
Ahmed Atta
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Strain Hardening ◽  
High Performance ◽  
Concrete Strength ◽  
Element Model ◽  
Element Analysis ◽  
Hardening Material ◽  
External Prestressing ◽  
Prestressing Tendon

The use of finite element analysis has been widely used as a means to analyze individual elements and the effects of concrete strength under loading. This paper is a study of prestressed concrete beams made of strain hardening material called UHP-SHCC (Ultra High Performance Strain Hardening Cementitious Composite) using finite element analysis to understand their response. A finite element model is studied and compared to experimental data. The basic parameters included second order effect of prestressed beam, and prestressing tendon depths have been considered in the analysis. The present study indicated the following conclusions: the number of deviators significantly influences the ultimate capacity and the strains values of UHP-SHCC beams, the change of external prestressing tendon depth has a significant effect on the cracking load, failure load, deflection values, and ultimate stress in the tendon in case of using UHP-SHCC beams but keep the final mode of failure without change.

New Connection Detail to Connect Precast Column to Cap Beam using Ultra-High-Performance Concrete in Accelerated Bridge Construction Applications

2018 ◽  
Vol 2672 (41) ◽  
pp. 207-220 ◽  
Author(s):  
Mohamadreza Shafieifar ◽  
Mahsa Farzad ◽  
Atorod Azizinamini
Keyword(s):  
High Performance ◽  
High Performance Concrete ◽  
Precast Concrete ◽  
Experimental Program ◽  
Accelerated Bridge Construction ◽  
Ultra High Performance Concrete ◽  
Bridge Construction ◽  
Construction Time ◽  
Element Analysis ◽  
Displacement Ductility

Accelerated bridge construction (ABC) is a paradigm change in delivery of bridges. ABC minimizes the traffic interruption, enhances safety to public and workers by significantly reducing on-site construction activities, and results in longer-lasting bridges. The use of precast elements is gaining attention owing to inherent benefits of accelerated construction. Designing an economical connection is one of the main concerns for these structures. New improved materials such as ultra-high-performance concrete (UHPC) with superior characteristics can provide solutions for joining precast concrete elements. In this paper two types of column to cap beam connection using UHPC are proposed for seismic and non-seismic regions. Among the merits of the proposed details, large tolerances in construction and simplicity of the connection can be highlighted which facilitates and accelerates the on-site construction time. The experimental program was carried out to evaluate the performance and structural behavior of the proposed connections. Four specimens were subjected to constant axial compressive loads and cyclic lateral loading. Results of the experiment showed that the displacement ductility of the specimens, incorporating suggested details, demonstrated adequate levels of displacement ductility. More importantly, the proposed connections prevented the damage into capacity protected element—in this case the cap beam. Analytical and nonlinear finite element analysis on the specimens was carried out to better comprehend the behavior of the proposed connections.

Finite Element Analysis of Steel Frame Beam-Column Irregular Joints with a Strengthened External Diaphragm

2014 ◽  
Vol 578-579 ◽  
pp. 274-277
Author(s):  
Wei Ning Sui ◽  
Qing Ze Shi ◽  
Zhan Fei Wang ◽  
Xue Bai
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Element Model ◽  
Thickness Ratio ◽  
Element Analysis ◽  
Panel Zone ◽  
Flange Thickness ◽  
Load Displacement ◽  
Joint Load ◽  
Analysis Models

Finite element analysis methods were conducted to investigate the seismic performance of panel zone at the connection of square steel column and two H-shaped beams with different heigth level by using ABAQUS. Compared with the previous test ,which verifies the correctness of finite element model. The paper sets up a total of 11 finite element analysis models, The changes of the web thickness, thickness of beam flange, diameter-thickness ratio in the finite element analysis models are studied, Which affect the beam end joint load - displacement curves and stress distribution.Studies have showed that: the beam flange thickness ratio and the beam offset ratio has insignificant influence on the load-displacement curves. The diameter to thickness ratio have sharp influence on the load-displacement curves.

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