scholarly journals Analytical Modelling of LACFCST Stub Columns Subjected to Axial Compression

Mathematics ◽  
2021 ◽  
Vol 9 (9) ◽  
pp. 948
Author(s):  
Yunlong Xu ◽  
Fei Lyu ◽  
Faxing Ding ◽  
Chenglu Liu ◽  
En Wang
Keyword(s):  
Bearing Capacity ◽  
Axial Compression ◽  
Lightweight Aggregate ◽  
Element Model ◽  
Design Parameters ◽  
Lightweight Aggregate Concrete ◽  
Superposition Method ◽  
Aggregate Concrete ◽  
Stub Column ◽  
Stub Columns

This paper presents a numerical investigation of lightweight aggregate concrete-filled circular steel tubular (LACFCST) stub columns under axial compression. A finite 3D solid element model of the LACFCST stub column was established by adopting a plastic-damage constitutive model of lightweight aggregate concrete (LAC). The finite element model (FEM) analysis results revealed that the confinement effect of the steel tube on the infilled LAC was weaker than that on the infilled conventional concrete. A parametric study making use of 95 full-scale FEMs was conducted to investigate the influences of various design parameters of LACFCST stub columns on their ultimate axial bearing capacity and the composite actions. Moreover, a numerical model of the axial and transverse stress of steel tubes at the ultimate state of LACFCST columns was proposed using the regression method. Based on the equilibrium conditions and the proposed model, a practical design formula making use of an enhancement factor was derived to estimate the ultimate bearing capacity of LACFCST stub columns by using the superposition method. The validity of the proposed formula was verified against the experimental data of 49 LACFCST stub column specimens under the axial loading available in the literature. Meanwhile, the accuracy and conciseness of the proposed formula were evaluated by comparison with the formulas suggested by the existing design codes.

Bearing Capacity of Stone-Lightweight Aggregate Concrete-Filled Steel Tubular Stub Column Subjected to Axial Compression

2019 ◽  
Vol 23 (7) ◽  
pp. 3122-3134 ◽  
Author(s):  
Xianggang Zhang ◽  
Xiaomei Kuang ◽  
Jianhui Yang ◽  
Yuhui Fan
Keyword(s):  
Bearing Capacity ◽  
Axial Compression ◽  
Lightweight Aggregate ◽  
Lightweight Aggregate Concrete ◽  
Aggregate Concrete ◽  
Stub Column

Research on Fire Behaviour of a Lightweight Aggregate Concrete Composite Floor

2011 ◽  
Vol 368-373 ◽  
pp. 911-914
Author(s):  
Hong Liang Sun ◽  
Xin Tang Wang ◽  
Ping Xin Sun
Keyword(s):  
Bearing Capacity ◽  
Lightweight Aggregate ◽  
Lightweight Aggregate Concrete ◽  
Fire Performance ◽  
Fire Behaviour ◽  
Dead Load ◽  
Fire Response ◽  
Fire Load ◽  
Aggregate Concrete ◽  
Bending Capacity

To study the fire performance of the profiled sheet-light aggregate concrete composite floor subjected to fire load, study of fire response and post-fire bearing capacity of a profiled sheet-lightweight aggregate concrete composite floor subjected to dead load is carried out. Based on the experimental results, the fire performance and post-fire bearing capacity of the floor after exposure to fire are analyzed. It is shown that the failure form of the profiled sheet-ceramsite concrete composite floor after exposure to fire still exhibits higher bending capacity, and the ultimate value of the equivalent distributed load is up to 30.69kN/m2, which may be used as basis of strengthening and repairing of the profiled sheet-ceramsite concrete composite floor after exposure to fire.

Experimental Study on All-Lightweight Aggregate Concrete Columns under Eccentric Loading

2012 ◽  
Vol 517 ◽  
pp. 392-397
Author(s):  
Yan Min Yang ◽  
Hao Zhang
Keyword(s):  
Experimental Study ◽  
Bearing Capacity ◽  
Lightweight Aggregate ◽  
Concrete Columns ◽  
Lightweight Aggregate Concrete ◽  
Fine Aggregate ◽  
Mechanical Behaviors ◽  
Load Bearing Capacity ◽  
Aggregate Concrete ◽  
Load Bearing

A kind of lightweight sand was only used as the fine aggregate to make the all-lightweight aggregate concrete, which can significantly reduce the gravity load of a structure and the foundation loads. Accordingly, the application of all-lightweight aggregate concrete in the construction projects can reduce the cost of foundation as well as construction project. In order to develop a new multi-story structural system which has a multifunction of load-bearing, lightweight and energy saving, the paper carried out an experimental study on the mechanical behaviors of six all-lightweight aggregate concrete columns with symmetrical reinforcement under eccentric loading. The failure modes, deformation characteristics and load-bearing capacity of the columns were analyzed. The effect of reinforcement ratio, stirrup ratio and eccentricity on the mechanical behaviors of the columns under eccentric loading were discussed. The test results show that all-lightweight aggregate concrete columns were loaded to failure with high load-bearing capacity and good ductility. The excellent mechanical behavior and the possibility of replacing the normal concrete with all-lightweight aggregate concrete were verified.

Experimental Study of Performance of Self-Stress Lightweight Aggregate Concrete Filled Steel Tubes after Exposure to Fire

2013 ◽  
Vol 790 ◽  
pp. 173-176
Author(s):  
Jin Can Xu ◽  
Peng Fei Ren ◽  
Hai Lun Tong ◽  
Xin Tang Wang
Keyword(s):  
Bearing Capacity ◽  
Fire Behavior ◽  
Lightweight Aggregate ◽  
Lightweight Aggregate Concrete ◽  
Fire Load ◽  
Steel Tubes ◽  
Aggregate Concrete ◽  
Expansive Agent ◽  
Short Columns ◽  
Concrete Filled Steel Tubes

The post-fire behavior of a set of self-stress lightweight aggregate concrete filled steel tubular short columns (noted as SSLC-SSC) after exposure to fire was experimentally studied. Effect of the maximum value of fire response temperatures of the tubes and their geometric parameters on the strength and the other mechanical property of the specimens were especially discussed. The experimental results show that the specimens of SSLC-SSC have higher post-fire bearing capacity and better plastic deformation, there was no obvious descent segment in post-fire load-displacement curves of the most specimens subjected to fire load. It was concluded that the maximum response temperature of specimens has great effect on the post-fire bearing capacity of self-stress concrete-filled steel tubes subjected to fire load, and the value of self-stress corresponding to 10% of dosage of expansive agent has the greatest effect on post-fire bearing capacity of specimens of SSLC-SSC.

scholarly journals Numerical Study on Confinement Effect and Efficiency of Concentrically Loaded RACFRST Stub Columns

2021 ◽  
Vol 8 ◽  
Author(s):  
Yicen Liu ◽  
Fei Lyu ◽  
Faxing Ding ◽  
En Wang ◽  
Yunlong Xu ◽  
...  
Keyword(s):  
Finite Element ◽  
Bearing Capacity ◽  
Steel Tube ◽  
Recycled Aggregate Concrete ◽  
Confinement Effect ◽  
Recycled Aggregate ◽  
Recycled Aggregates ◽  
Superposition Method ◽  
Aggregate Concrete ◽  
Stub Columns

The mechanical behaviors of recycled aggregate concrete (RAC) are upgraded by outer steel tube confinement, and the performance of recycled aggregate concrete-filled steel tubular (RACFST) columns is similar to that of the traditional concrete-filled steel tube (CFST) columns. The purpose of this study is to investigate the behaviors of recycled aggregate concrete-filled rectangular steel tubular (RACFRST) stub columns under axial loading. Three-dimensional finite element (FE) models were established, which utilized a triaxial plastic-damage constitutive RAC model considering the replacement ratio of recycled aggregates. The finite element analysis results indicated that the lessened ultimate bearing capacity of RACFRST stub columns compared with their traditional concrete infilled counterparts was mainly due to the weakened confinement effect and confinement efficiency. A simplified formula of the bearing capacity of concentrically loaded RACFRST stub columns was proposed. The cross-sectional stress nephogram was reasonably simplified by the limited state of infilled concrete. The basics of proposed formula were the equilibrium condition and the superposition method. Finally, the formula for the bearing capacity of RACFRST stub columns was evaluated by comparing its accuracy and feasibility to some design formulae proposed by specialists and some design codes of different regions.

Normal Section Bearing Capacity of Light Weight Aggregate Concrete Member with Circular Section under Eccentric Compression

2012 ◽  
Vol 446-449 ◽  
pp. 445-449
Author(s):  
Xiao Hong Liu ◽  
Ji Cheng ◽  
Ii Young Jang ◽  
Jong Kwon Park ◽  
Fei Peng Zhao ◽  
...  
Keyword(s):  
Bearing Capacity ◽  
Compressive Loading ◽  
Fundamental Equation ◽  
Lightweight Aggregate ◽  
Lightweight Aggregate Concrete ◽  
Concrete Member ◽  
Circular Section ◽  
Aggregate Concrete ◽  
Normal Section ◽  
Nonlinear Stress

According to the nonlinear stress-strain relationship of LAC (lightweight aggregate concrete), in this paper whole process theoretical analysis on normal section bearing capacity has been done on lightweight aggregate reinforced concrete member with circular section under eccentric compressive loading. Fundamental equation of numerical iteration is established for normal section bearing capacity of LAC member with circular section under eccentric compressive loading, which provides theoretical basis for concerned calculation simplification.

scholarly journals Bearing Capacity of Lightweight Aggregate Concrete

1969 ◽  
Vol 18 (185) ◽  
pp. 136-143
Author(s):  
Manabu FUJII
Keyword(s):  
Bearing Capacity ◽  
Lightweight Aggregate ◽  
Lightweight Aggregate Concrete ◽  
Aggregate Concrete

The Experimental Research of New Lightweight Steel Composite Slab

2012 ◽  
Vol 188 ◽  
pp. 157-161
Author(s):  
Dian Zhong Liu ◽  
Shi Hao Tian
Keyword(s):  
Bearing Capacity ◽  
Strain Curve ◽  
Steel Structure ◽  
Lightweight Aggregate ◽  
Lightweight Aggregate Concrete ◽  
Aggregate Concrete ◽  
Composite Slab ◽  
Composite Sandwich ◽  
Steel Cast ◽  
Thin Walled

The new composite sandwich slab of the cold formed thin-walled steel and lightweight aggregate concrete is studied. The composite sandwich slab is a skeleton of cold formed thin-walled steel, cast-in-situ lightweight aggregate concrete, built-in benzene board as a sandwich layer. The composite sandwich slab has a light weight, seismic performance is good, and construction period is short of advantage, can effectively solve poor shortcomings of the steel structure fireproofing performance and corrosion resistance, and can effectively improve the whole and local stability of the steel structure. The composite sandwich slab bearing capacity of the cold formed thin-walled steel and lightweight aggregate concrete is analyzed using simple plastic theory. The deflection to consider interface slip of the composite slab is computed. The composite sandwich slab is tested statically; the failure mechanism of the slab is analyzed. The load-deflection curve, load-strain curve are obtained. The sandwich rate of the slab on the influence of the bearing capacity is analyzed using the finite element method, and theoretical with experimental results comparatively analyzed.

The axial compressive behavior of stone-lightweight aggregate concrete-filled steel tubular stub columns

2021 ◽  
Vol 298 ◽  
pp. 123815
Author(s):  
Xianggang Zhang ◽  
Songpeng Zhang ◽  
Yuhui Fan ◽  
Yahong Ding ◽  
Xingguo Wang ◽  
...  
Keyword(s):  
Lightweight Aggregate ◽  
Lightweight Aggregate Concrete ◽  
Compressive Behavior ◽  
Aggregate Concrete ◽  
Stub Columns

Mechanical performance test and analysis of prestressed lightweight aggregate concrete hollow slab

2019 ◽  
Vol 22 (8) ◽  
pp. 1830-1844 ◽  
Author(s):  
Shiping Li ◽  
Chao Song
Keyword(s):  
Bearing Capacity ◽  
Crack Width ◽  
Performance Test ◽  
Mechanical Performance ◽  
Lightweight Aggregate ◽  
Lightweight Aggregate Concrete ◽  
Influence Coefficient ◽  
Test Results ◽  
Loading Test ◽  
Aggregate Concrete

To investigate the mechanical performance of prestressed lightweight aggregate concrete hollow slabs, a symmetric loading test was performed on eight prestressed concrete hollow slabs categorised into four groups based on their variety of coarse aggregate concrete and span, and their respective failure mode, bearing capacity, deformation performance and crack propagation were analysed. Based on the test data, a simulation model was subsequently established to simulate and analyse the test components. The test results showed that the bending process of the prestressed lightweight aggregate concrete hollow slab goes through three stages: elasticity, elasto-plasticity and plasticity. Furthermore, its bearing capacity and failure characteristics are similar to those of a prestressed ordinary concrete hollow slab. Subsequently, we derived a formula for checking the calculation of crack width by introducing a comprehensive influence coefficient of concrete Cm and combining it effectively with the formula in the current code and verified its efficacy. The calculated value of the formula agrees well with the test results, providing a reference for the application of engineering and a supplementary calculation formula for the crack width of lightweight aggregate concrete hollow slabs.

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