scholarly journals Experimental and Numerical Seismic Evaluation of RC Walls Under Axial Compression

2020 ◽  
Author(s):  
Tahir Mehmood ◽  
Ahsen Maqsoom ◽  
Adnan Nawaz ◽  
Badar-Ul Ali Zeeshan
Keyword(s):  
Shear Strength ◽  
Axial Compression ◽  
Axial Load ◽  
Numerical Models ◽  
Response Prediction ◽  
Accurate Estimate ◽  
Seismic Evaluation ◽  
Compression Load ◽  
High Rise ◽  
Experimental Findings

Recent studies show that code-based equations usually do not provide an accurate estimate for the shear strength of short reinforced concrete (RC) walls due to the negligence of many important factors including the beneficial effect of axial compression. In the current study, quasi-static reversed cyclic testing is conducted for two RC wall specimens, one under axial load and one without axial load to assess the effect of the axial compression on the shear strength of RC walls in high-rise buildings. The results of the experimental study show that the axial compression load significantly improves the shear strength of RC walls. Results are also compared with the performance-based seismic evaluation code practices. Based on the experimental findings, recommendations are made for improvements in the existing codes. The experimental results are further compared with different numerical models to explore the suitable computer modeling options for non-linear response prediction of RC walls.

scholarly journals Structural Behaviour of Putra Block Under Axial Load Using FEM

2018 ◽  
Vol 79 (1) ◽  
Author(s):  
Pang Wei Ken ◽  
Abdul Aziz bin Abdul Samad ◽  
Goh Wan Inn ◽  
Noridah Mohamad ◽  
Mohamad Zulhairi Mohd Bosro ◽  
...  
Keyword(s):  
Finite Element ◽  
Axial Compression ◽  
Axial Load ◽  
Ultimate Load ◽  
Research Work ◽  
Research Centre ◽  
Structural Behaviour ◽  
Element Analysis ◽  
Compression Load ◽  
Hollow Block

Interlocking hollow block (IHB) system is a new building technology which eliminates the mortar layer and instead provides a key connection (protrusions and grooves) to interconnect the blocks. With respect to the mortarless feature of the system, it will shorten the construction period, reduce labour and cost, and is environmental friendly. This study covers the modelling and the analysis of Putra Block which is an interlocking hollow block system developed by the Housing Research Centre at Universiti Putra Malaysia (UPM) under axial compression load using Finite Element Method (FEM). The block units comprise of a stretcher block, a corner block and a half block. The aims of this research were to develop the Putra Block prism model using ABAQUS software and to study the structural behaviour of these prisms under axial load using finite element analysis. The Putra Block prism consists of three layers of blocks where the top and bottom layer are made of stretcher block where the middle layer are made of two half blocks placed side by side. Before proceeding with the simulation study, validation of the Putra Block prisms was conducted by using results from previous experimental research work. It was found that the ultimate load between experimental and simulation results had slight differences with an error of 2.56%. The small variations justify the ability of ABAQUS to predict the structural behaviour of elements under axial compression load with good accuracy level. Based on the FEA study, higher compressive stress value was observed on the face-shell of the block whilst higher tensile stress occurred at the webs. The failure of the prisms was mainly due to extensive tensile cracks induced at the web-shell interaction and middle of the block. Further parametric study reveals that by increasing the height of the individual blocks lead to the reduction of its ultimate load. Consequently, the use of higher concrete grade block indicated an improvement in the prism strength and stability under axial load.

Experimental assessment of the shear strength of an asymmetric steel composite beam with web openings

2005 ◽  
Vol 32 (2) ◽  
pp. 314-328 ◽  
Author(s):  
Young K Ju ◽  
Do-Hyun Kim ◽  
Sang-Dae Kim
Keyword(s):  
Shear Strength ◽  
Composite Beam ◽  
Residential Buildings ◽  
Shear Capacity ◽  
Structural System ◽  
Web Openings ◽  
Wide Beam ◽  
High Rise ◽  
Beam Shear ◽  
Steel Composite

The number of high-rise buildings has greatly increased in Korea, and storey height is a significant component of tall residential buildings due to the limited city area. To reduce storey height, the wide beam has been adopted in some projects in Seoul such as Trump World, Galleria Palace, and Richencia. The joints between the wide beam and the core wall were too narrow to place the reinforcement, however. This paper investigates a newly developed structural system called the innovative, technical, economical, and convenient hybrid system (iTECH system). The iTECH system has an asymmetric steel assembly with web openings, where the top plate is welded on top of inverted structural "tees" whose cut is referred to as a "honeycomb" type. Both sides of the web and the slab are filled with cast-in-place concrete. The shear capacity was experimentally evaluated and verified, with parameters determined by factors that shared the shear strength of the iTECH beam. The steel web, inner concrete panel, and outer concrete panel contributed to the shear strength of the iTECH beam. The shear stirrup did not contribute much to the shear strength, however, and therefore a design equation using the steel web and inner concrete panel was suggested.Key words: composite beam, shear capacity, monotonic test, high-rise building.

Shear strength of RC beams subjected to axial load

2017 ◽  
Vol 15 (1) ◽  
pp. 32-48 ◽  
Author(s):  
T. Zhang ◽  
P. Visintin ◽  
D. J. Oehlers
Keyword(s):  
Shear Strength ◽  
Axial Load ◽  
Rc Beams

Experimental Study on Mechanical Behavior of Cold-Formed Steel Three Limbs Built-up Section Members

2010 ◽  
Vol 163-167 ◽  
pp. 651-654
Author(s):  
Tian Hua Zhou ◽  
Shao Feng Nie ◽  
Xiang Bin Liu ◽  
Guang Yi Li
Keyword(s):  
Experimental Study ◽  
Mechanical Behavior ◽  
Axial Compression ◽  
Local Buckling ◽  
Distortional Buckling ◽  
Torsional Buckling ◽  
Failure Characteristics ◽  
Compression Load ◽  
Cold Formed Steel ◽  
Flexural Torsional Buckling

18 specimens of cold-formed steel three limbs built-up section members are tested under axial compression load in this paper. The section forms are divided into two categories: A and B. Load-displacement (P-Δ) curves and failure characteristics of specimens are obtained. The results show that: As to section A members, the failure characteristics of LC, MC and SC series of specimens are flexural-torsional buckling, torsional buckling and distortional buckling, local buckling and distortional buckling. As to section B members, the failure characteristics of LC, MC series of specimens are flexural buckling, while local buckling and distortional buckling for members of SC series.

Probabilistic failure envelopes of strip foundations on soils with non-stationary characteristics of undrained shear strength

Géotechnique ◽  
2021 ◽  
pp. 1-44
Author(s):  
Zhichao Shen ◽  
Qiujing Pan ◽  
Siau Chen Chian ◽  
Susan Gourvenec ◽  
Yinghui Tian
Keyword(s):  
Shear Strength ◽  
Random Field ◽  
Numerical Models ◽  
Undrained Shear Strength ◽  
Considerable Effect ◽  
Failure Envelopes ◽  
Autocorrelation Distance ◽  
Stationary Random Field ◽  
Constant Coefficient Of Variation ◽  
Undrained Shear

This paper investigates probabilistic failure envelopes of strip foundations on spatially variable soils with profiles of undrained shear strength su linearly increasing with depth using the lower bound random finite element limit analysis. The spatially variable su is characterised by a non-stationary random field with linearly increasing mean and constant coefficient of variation (COV) with depth. The deterministic uniaxial capacities and failure envelopes are firstly derived to validate numerical models and provide a reference for the subsequent probabilistic analysis. Results indicate that the random field parameters COVsu (COV of su) and Δ (dimensionless autocorrelation distance) have a considerable effect on the probabilistic normalised uniaxial capacities which alters the size of probabilistic failure envelopes. However, COVsu and Δ have an insignificant effect on the shape of probabilistic failure envelopes is observed in the V-H, V-M and H-M loading spaces, such that failure envelopes for different soil variabilities can be simply scaled by the uniaxial capacities. In contrast to COVsu and Δ, the soil strength heterogeneity index κ = μkB/μsu0 has the lowest effect on the probabilistic normalised uniaxial capacity factors but the highest effect on the shape of the probabilistic failure envelopes. A series of expressions are proposed to describe the shape of deterministic and probabilistic failure envelopes for strip foundations under combined vertical, horizontal and moment (V-H-M) loading.

Fatigue of full crown monolithic CAD/CAM restorations for posterior teeth

2021 ◽  
Author(s):  
khaled Bataineh ◽  
assem Al Alkarasneh
Keyword(s):  
Fatigue Resistance ◽  
Axial Load ◽  
Ceramic Materials ◽  
Dental Restoration ◽  
Posterior Teeth ◽  
Finite Element Software ◽  
Sliding Motion ◽  
Cad Cam ◽  
Materials Used ◽  
Experimental Findings

Abstract Objective The purpose of this study is to estimate the fatigue life of five polycrystalline zirconia CAD/CAM ceramic materials used for posterior restoration. This study presents the first time methodology to translate raw data obtained from laboratory test into useful data to predict the clinical life of dental restoration. Methods A typical model for the first molar restored crown is built and transferred into finite element software ANSYS 18.1 flor execution FEA. The materials are: two Y-TZP zirconia (LAVA (LVs), and EVEREST (KVs); IPS e.max CAD; Suprinity PC; and Celtra Duo. Two types of loads are applied, axial load and axial load followed by the sliding motion of lower jaw. The fatigue resistance of various restorative materials is determined. Results Experimental findings show that all the samples have fractured between cusps at the same location, which is slightly off the symmetry fissure plane. For crowns made of LAVA and EVEREST, the life is longer than 10 years under an axial load of 1000 N, while the lives for IPS e.max CAD; Suprinity PC; and Celtra Duo were longer than 10 years under an axial load of 185 N. The life of all-ceramic crown materials was predicted by FEA and found to conform to previous experimental and clinical observations. Conclusion Crowns made of Y-TZP zirconia has superior fatigue resistance compared to other ceramic CAD/CAM materials.

scholarly journals Tool stability analysis for deep hole drilling

2018 ◽  
Vol 224 ◽  
pp. 01035 ◽  
Author(s):  
Sergey Gorbatyuk ◽  
Valery Kondratenko ◽  
Larisa Sedykh
Keyword(s):  
Stability Analysis ◽  
Cutting Force ◽  
Axial Compression ◽  
Cutting Tools ◽  
Critical Value ◽  
Hole Drilling ◽  
Deep Hole ◽  
Compression Load ◽  
Rotary Cutting ◽  
Rotary Cutting Tools

A large number of parts have deep holes, therefore, rotary cutting tools, which represent relatively long and thin columns are used for holemaking. In this article we analyze the behavior of such tools under the influence of an axial compression load, in our case, the axial cutting force Fp , which differs fundamentally from the compression of short tools. Moreover, experience shows that when the cutting force Fp reaches a certain critical value equal to Fkp , a long straight column becomes unstable.

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