scholarly journals Experimental Study on an Innovative Hollow Concrete Floor System Assembled with Precast Panels and Self-Thermal-Insulation Infills

2021 ◽  
Vol 2021 ◽  
pp. 1-13
Author(s):  
Liang Gong ◽  
Zhongfan Chen ◽  
Yan Feng ◽  
Sihan Ruan ◽  
Liuhui Tu
Keyword(s):  
Thermal Insulation ◽  
Carrying Capacity ◽  
Crack Development ◽  
Scale Model ◽  
Load Carrying Capacity ◽  
Vertical Load ◽  
Loading Test ◽  
Concrete Floor ◽  
Load Carrying ◽  
Floor System

This paper presents an innovative hollow concrete floor system comprising hollow precast panels and self-thermal-insulation infills. The precast panels are connected by welded reinforcement bars and cast-in-situ concrete joints. To study the vertical load-carrying capacity and the working mechanism of this innovative floor system, a static loading test was carried out on a 1/2 scale model. The specimen consists of six precast slab members, four precast reinforced concrete beams and columns, respectively. Experimental and simulation results related to the crack development and vertical load-carrying capacity were analyzed. It is found that the innovative floor system could meet the capacity requirements of the Chinese code. Furthermore, the crack development of the innovative system shows similar characteristics with the solid floor. To explore the feasibility of the existed analysis methods, the specimen was simulated and compared by nonlinear analysis in ABAQUS. The comparison illustrates that the analogue cross beam method is more accurate and suitable for the simulation of the innovative hollow concrete floor system.

scholarly journals Experimental and Numerical Study of Seismic Performance of Precast Prestressed Concrete Frame Internal Connection

2015 ◽  
pp. 406-413
Author(s):  
Xiandong Liao ◽  
Xiang Hu
Keyword(s):  
Seismic Performance ◽  
Prestressed Concrete ◽  
Carrying Capacity ◽  
Numerical Study ◽  
Scale Model ◽  
Load Carrying Capacity ◽  
Concrete Frame ◽  
Internal Connection ◽  
Load Carrying ◽  
Precast Prestressed Concrete

The seismic performance of the internal connection of precast prestressed concrete frame was studied systematically, based on the experiment of full-scale model under low cyclic reversed loading. This study was mainly focused on failure pattern, load-carrying capacity, skeleton curves, and hysteresis curves. Furthermore, a nonlinear finite element analysis using Abaqus was carried out to study the characteristics of the internal connection of precast prestressed concrete frame. Results revealed that the damage was concentrated mainly on beam end owing to flexural action, while steel bars in the columns and stirrups in the core region remained elastic until failure occurred. The calculated value of the load-carrying capacity of the internal connection was similar to the experimental one. Present study can be referenced for the application of precast prestressed concrete frame in high seismic zones.

scholarly journals Ultimate Capacity of Vertical Pile Subjected to Combination of Vertical and Lateral Load

2019 ◽  
Vol 8 (9S2) ◽  
pp. 647-652
Keyword(s):  
Carrying Capacity ◽  
Ultimate Load ◽  
Lateral Load ◽  
Load Factor ◽  
Load Carrying Capacity ◽  
Vertical Load ◽  
Ultimate Capacity ◽  
Inclined Load ◽  
Load Carrying ◽  
Ultimate Load Carrying Capacity

Pile under general condition is subjected to combination of vertical and lateral loads In the analytical approaches to predict the load-displacement responses of a pile under central inclined load, it is assumed that the lateral displacement of the pile head is independent by the vertical load factor of the inclined load. Similarly, while estimating the ultimate resistance it is considered that the vertical load factor of the inclined load does not influence the ultimate lateral resistance of the pile during determination of ultimate load carrying capacity of vertical pile. In the present work, an empirical relation has been developed to predict the ultimate load carrying capacity of vertical piles subjected to combination of both vertical and lateral load in cohesion less soil. Effect of lateral load on vertical load deflection behavior of vertical piles when axial loads are present are discussed through several experimental results obtained from tests on model piles. Ultimate capacity is found to be a continuous function of ultimate lateral load, ultimate vertical load capacity and tangent of angle of resultant load made with vertical axis of pile.

scholarly journals Development of a Prestressing CFRP Laminate Anchorage System and Bridge Strengthening Application

2019 ◽  
Vol 2019 ◽  
pp. 1-9
Author(s):  
Fangyuan Li ◽  
Wenhao Li ◽  
Shaohui Lu ◽  
Yin Shen
Keyword(s):  
Carrying Capacity ◽  
Large Scale ◽  
Scale Model ◽  
Load Carrying Capacity ◽  
Cfrp Laminate ◽  
Cfrp Laminates ◽  
Anchorage System ◽  
Bridge Strengthening ◽  
Load Carrying ◽  
Working Together

For prestressed carbon fiber reinforced polymer (CFRP) tendon anchorage systems to become well established and used on a large scale, practical requirements for structure strengthening may be met by performing a relatively easy anchorage technique using prestressing CFRP laminates. From testing performed on a clip-type CFRP laminate anchorage system developed in our research group, it was revealed that this system could achieve the anchorage efficiency and the relaxation met the requirement of specification. Furthermore, the relevant indices of the anchorage system met the prestressed system standards. A test on the load-carrying capacity of a full-scale model beam demonstrated that the load-carrying capacity of the beam increased by more than 60% after it was strengthened with the anchorage system. The prestressing CFRP laminates and the bridge structure deformed and bore stress as a composite and exhibited excellent operating performance when working together.

scholarly journals Small Scale Experiments to Assess the Bearing Capacity of Footings on the Sloped Surface

Eng ◽  
2020 ◽  
Vol 1 (2) ◽  
pp. 240-248
Author(s):  
Mohammad Nurul Islam
Keyword(s):  
Bearing Capacity ◽  
Carrying Capacity ◽  
Maximum Load ◽  
Scale Model ◽  
Small Scale ◽  
Load Carrying Capacity ◽  
Engineering Structures ◽  
Load Carrying ◽  
Limiting Condition ◽  
The Impact

Construction of civil engineering structures on or next to a slope requires special attention to meet the bearing capacity requirements of soils. In this paper, to address such a challenge, we present laboratory-scale model tests to investigate the effect of footing shape on the sloped surface. The model comprised of a well stiffened mild steel box with three sides fixed and one side open. We considered both with and without reinforcement to assess the effectiveness of reinforcement on the sloped surface. Also, we used three types of footing (i.e., square, rectangular, and circular) to measure the footing shape effects. We considered three different slope angles to evaluate the impact of the sloped face corresponding to the applied load and the reinforcement application. We obtained that the maximum load carrying capacity in the square footing was higher than the rectangular and the circular footing for both the reinforced and the unreinforced soil. With the increase of geo-reinforcement in all three footing shapes and three sloped angles, the load carrying capacity increased. We also noticed a limiting condition in geo-reinforcement placement effectiveness. And we found that with the increase of slope, the load bearing capacity decreased. For a steep slope, the geo-reinforcement placement and the footing shape selection is crucial in achieving the external load sustainability, which we addressed herein.

Actual Effects of Local Buckling of Thin-Walled Metal Roof Decking: Control Experimental Verification Performed during Structure Realization

2013 ◽  
Vol 368-370 ◽  
pp. 1503-1506
Author(s):  
Marcela Karmazínová ◽  
Jindrich Melcher
Keyword(s):  
Experimental Verification ◽  
Carrying Capacity ◽  
Failure Process ◽  
Local Buckling ◽  
Load Carrying Capacity ◽  
Limit States ◽  
Loading Test ◽  
Actual Behaviour ◽  
Load Carrying ◽  
Thin Walled

Experimental verification of structural members can be the necessary part of the structural design of load-carrying civil structures, mainly in the period of last two decades. In some cases, the knowledge obtained from the tests is the sole source of the reliable information about actual behaviour of structural member in strain and failure process and about its objective load-carrying capacity. The paper is specifically aimed at the control experimental verification of roof decking based on thin-walled metal profiled sheets. Loading test has been performed during structure erection, as additional resource for the verification of actual behaviour and objective load-carrying capacity and for the confirmation or refinement of static design assumptions and results, within the ultimate and serviceability limit states. The subject of the control experimental verification was roof decking composed of thin-walled metal cassettes with thermal insulation at its upper side, used for the university lecture room roofing.

Remaining Capacity of Corroded Gusset Plate Connection

2019 ◽  
Author(s):  
Takeshi Miyashita ◽  
Ngoc Vinh Pham ◽  
Kazuo Ohgaki ◽  
Yusuke Okuyama ◽  
Yuya Hidekuma ◽  
...  
Keyword(s):  
Carrying Capacity ◽  
Plate Thickness ◽  
Fem Analysis ◽  
Load Carrying Capacity ◽  
Loading Test ◽  
Cross Sectional ◽  
Gusset Plate ◽  
Load Carrying ◽  
Remaining Capacity ◽  
Plate Connection

<p>Nowadays, severe damage on the gusset plate connection of steel truss bridges due to corrosion has been widely reported all over the world. In this context, the remaining load-carrying capacity of a corroded gusset plate connection was evaluated by using the loading test and Finite Element Method (FEM) analysis. Two potential forms of corrosion on the gusset plate, namely welding and cross-sectional corrosion, were proposed to investigate the reduction of load-carrying capacity. The overall FEM model dimension for the real bridge was scaled down by a percentage of 50%. The degrees of corrosion sections were assumed disconnected at about 50% of the weld length and the loss of the gusset plate thickness was 50% and 75%. Parametric FEM analysis was performed to evaluate the effect of the degree of corrosion on the remaining load-carrying capacity of the gusset plate connection.</p>

scholarly journals Effect of Interfacial Debonding on the Strength of Composite Structure-Similarity Scale Model for the Wing-Box

2015 ◽  
Vol 2015 ◽  
pp. 1-8
Author(s):  
Shiyong Sun ◽  
Rui Yang ◽  
Zibin Yan ◽  
Wei Qian
Keyword(s):  
Carrying Capacity ◽  
Bonding Strength ◽  
Ultimate Load ◽  
Scale Model ◽  
Load Carrying Capacity ◽  
Load Carrying ◽  
Box Structure ◽  
Ultimate Load Carrying Capacity ◽  
Composite Wing ◽  
Wing Box

Based on the wing-box structure, a model was established to analyze the strength of the scale model for the composite wing. Firstly, different failure criteria were set to determine damage onset of the components. The continuum damage variables were adopted in the stiffness degradation rule. Secondly, the interface elements were placed along the interface between the beam flange and the skin to investigate the effects of bonding strength on the ultimate load-carrying capacity of the wing-box. The failure modes of the wing-box structure were studied by using the nonlinear finite element method. The effect of flange’s width on the strength of wing-box was discussed based on the prediction method. The results indicated that the ultimate load-carrying capacity varied distinctly with the change of flange’s width. However, the bonding strength had limited effect on the model strength as the flange’s width increases to the critical value. The research methods and results of the study can serve as reference for the strength analysis on the scale model of composite wing as well as the determination of principles adopted in the design of the scale model for wing spar.

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