Pseudo-Static Experiment Study on Recycled Concrete High Shear Walls

2012 ◽  
Vol 517 ◽  
pp. 577-582 ◽  
Author(s):  
Li Hua Chen ◽  
An Zhou ◽  
Bing Kang Liu
Keyword(s):  
Bearing Capacity ◽  
Axial Load ◽  
Shear Walls ◽  
Load Ratio ◽  
Recycled Concrete ◽  
High Shear ◽  
Ordinary Concrete ◽  
Failure Patterns ◽  
Mechanical Performances ◽  
Cyclic Loading Tests

The low-cyclic loading tests are carried out for three pieces of recycled concrete high shear walls, with 100% replacement ratio of recycled coarse aggregate under different axial-load ratios. The mechanical performances of shear walls, including failure patterns, the bearing capacity, the hysteretic properties and ductility, are analyzed. The test results indicate that the basic behavior of recycled concrete shear walls resembles quite closely that of the ordinary concrete shear walls, the recycled concrete shear wall under bending failure has good ductility and bearing capacity; the hysteresis loop is stable and the degradation of stiffness is not great; the shear-slip phenomenon becomes significant and the ductility decreases under high axial-load ratio. The calculation of flexural strength of recycled concrete shear walls can be adopted directly from computational theories and formula used for ordinary concrete shear walls. It is feasible to apply reasonably designed recycled concrete shear walls to small high-rise buildings.

Nonlinear Numerical Analysis of SRC Frame Middle Joints

2013 ◽  
Vol 376 ◽  
pp. 231-235
Author(s):  
Cheng Li ◽  
Yun Zou ◽  
Jie Kong ◽  
Zhi Wei Wan
Keyword(s):  
Finite Element ◽  
Numerical Analysis ◽  
Bearing Capacity ◽  
Axial Load ◽  
Load Ratio ◽  
Experimental Results ◽  
Steel Ratio ◽  
Finite Element Software ◽  
Axial Load Ratio ◽  
Hysteretic Performance

Nonlinear numerical analysis for the force performance of frame middle joint is processed in this paper with the finite element software of ABAQUS. Compared with experimental results, numerical analysis results are found to be reasonable. Then the influence of factors such as shaped steel ratio and axial-load ratio are contrastively analyzed. The results show that shaped steel ratio has a greater influence on the bearing capacity and hysteretic performance of the structure, but the axial-load ratio has less influence.

Experimental and numerical investigation on failure behavior of ring joints in precast concrete shear walls

2019 ◽  
Vol 23 (1) ◽  
pp. 118-131
Author(s):  
Jian Zhou ◽  
Xudong Zhi ◽  
Feng Fan ◽  
Anliang Jiao ◽  
Hongliang Qian
Keyword(s):  
Bearing Capacity ◽  
Precast Concrete ◽  
Critical Role ◽  
Axial Loading ◽  
Shear Walls ◽  
Yield Ratio ◽  
Failure Behavior ◽  
Displacement Ductility ◽  
Failure Patterns ◽  
Pull Out

Precast shear wall structures have been widely used due to their outstanding features, and the joints between precast members play a critical role in complete structures, specifically for vertical joints. The ring joint is a new connection method used for the vertical connection. Few studies and related regulations were traced; therefore more detailed studies are required. In order to study the anchoring performance and failure behavior, an experimental model was designed and tested under monotonic axial loading, taking the composite height of ring rebars, concrete specifications, diameter of the horizontal rebars, relative position of the ring rebars, diameter of the ring rebars, and number of horizontal rebars into consideration. The failure phenomena were observed and the data were collected. The failure pattern, bearing capacity, yield ratio, displacement ductility coefficient, and other performance parameters were analyzed. The study indicated that the failure patterns are divided into ring rebar pull-out and ring rebar fracture. Increasing the composite height of the ring rebar, the concrete specifications and the number of horizontal rebars could improve the bearing performance, and the contribution of the horizontal rebar diameter was limited, and interlocking ring rebars arranged uniformly are not optimal. In the case of joint failure, the yield ratio is relatively small and the displacement ductility coefficient is larger, which shows the bearing capacity reserve is better. A numerical model was established to analyze the internal behavior, and the results were in good agreement with the experimental results, important for us to understand the failure behavior. Design recommendations will promote its application.

scholarly journals Deformation Limits of L-Section RC Shear Walls

2016 ◽  
Vol 10 (1) ◽  
pp. 334-348
Author(s):  
Cui Ji-Dong ◽  
Han Xiao-Lei ◽  
Yang Wan ◽  
Li Wei-Chen
Keyword(s):  
Axial Load ◽  
Failure Modes ◽  
Shear Walls ◽  
Load Ratio ◽  
Shear Wall ◽  
Damage State ◽  
Shear Span ◽  
Axial Load Ratio ◽  
Set Up ◽  
Rc Shear Wall

In order to establish the relation between damage state and member deformation of the L-section RC shear wall, 216 FE models designed to meet the requirements of the Chinese codes were set up. The analysis fully considers the variation of parameters including axial load ratio and shear span ratio etc. According to the results, criteria of classifying failure modes of L-section RC shear walls are proposed. Failure modes are determined by shear-span ratio, moment-shear ratio and end columns' reinforcement ratio. Deformation limits corresponding to respective performance levels are put forward. Fitted formulas of calculating the limits are also presented. It is shown that the categorization criteria are reliably accurate in predicting failure modes. Deformation limits of a given L-section RC shear wall could be determined via axial load ratio and moment-shear ratio. The fitted formulas possess a satisfactory correlation with numerical results.

scholarly journals Experimental Investigation on Seismic Resistance of RC Shear Walls with CFRP Bars in Boundary Elements

2020 ◽  
Vol 14 (1) ◽  
Author(s):  
Jun Zhao ◽  
Fuqiang Shen ◽  
Chenzhe Si ◽  
Yuping Sun ◽  
Lu Yin
Keyword(s):  
Experimental Investigation ◽  
Energy Dissipation ◽  
Axial Load ◽  
Residual Deformation ◽  
Shear Walls ◽  
Load Ratio ◽  
Boundary Elements ◽  
Cumulative Energy ◽  
Equivalent Viscous Damping ◽  
Axial Load Ratio

AbstractExperimental investigation on seismic performance of RC shear walls reinforced with CFRP bars in boundary elements to enhance the resilience was presented which is expected for stable resistance capacity and small residual deformation. Six RC shear walls reinforced with CFRP bars as longitudinal tensile materials in boundary elements were tested under reversed cyclic lateral loading while subjected to constant axial compression with different axial load ratios of 0.17, 0.26 and 0.33, respectively. Two forms of stirrups were used for each axial load ratio, which were rectangular and circular stirrups in boundary elements. A reference specimen, ordinary RC shear walls, was also introduced to certify the excellence of CFRP bars. The test results indicated that the walls utilizing CFRP bars had small residual deformations and residual crack widths. Lower crack propagation height and larger concrete crushing region, bearing capacity and equivalent viscous damping coefficient (EVDC) could be observed with the increase of axial load ratios. The effects of stirrup forms on experimental results had a relation to the axial load ratio. When the axial load ratio was small, the shear walls with circular stirrups had better energy dissipation than that with rectangular stirrups at a given drift level, while the cumulative energy dissipation (CED) were similar. With the increase of axial load ratio, the walls exhibited similar energy dissipation at the same drift level, however, the shear walls with rectangular stirrups had larger CED.

Cyclic Lateral Load Test on T-Shaped Reinforced Concrete Columns

2013 ◽  
Vol 718-720 ◽  
pp. 1923-1927
Author(s):  
Fu Lai Qu ◽  
Gui Rong Liu ◽  
Pei Yuan Tian ◽  
Lu Yang Qi
Keyword(s):  
Reinforced Concrete ◽  
Bearing Capacity ◽  
Axial Load ◽  
Cyclic Load ◽  
Load Ratio ◽  
Concrete Columns ◽  
Load Test ◽  
Axial Load Ratio ◽  
Cyclic Lateral Load ◽  
The Web

Based on the experiment of eight reinforced concrete T-shaped columns under low cyclic load, the factors which affect bearing capacity and seismic behavior, such as limb length, axial load ratio, stirrup ratio and the arrangement of longitudinal bars, etc., are analyzed. Tests results show that the bearing capacity of the columns increases, but the ductility is decreased with an increase of axial load ratio. The bearing capacity of T-shaped column increases when the web gets longer, while its deformability and ductility decrease. Besides, increase of stirrup ratio and longitudinal bars in the end of the web also have effect on the ductility of the columns.

Study on the Bearing Capacity and Ductility of Steel Reinforced Concrete T-Shaped Columns

2011 ◽  
Vol 368-373 ◽  
pp. 28-32
Author(s):  
Zhe Li ◽  
Shao Ji Chen ◽  
Cui Ping Zhang ◽  
Shuai Zhang
Keyword(s):  
Reinforced Concrete ◽  
Bearing Capacity ◽  
Axial Load ◽  
Concrete Strength ◽  
Load Ratio ◽  
Steel Reinforced Concrete ◽  
Axial Load Ratio ◽  
Curvature Ductility ◽  
Ductile Behavior ◽  
Load Angle

Compared with reinforced concrete shaped columns, bearing capacity and ductility of steel reinforced concrete shaped columns are significantly improved, so it is with theoretical significance and practical application of value to research. Based on the plain cross section presume, with material T-section boundary calculation unit, 15 steel reinforced concrete T-shaped columns(SRCTSC) have made nonlinear full-rang numerical analysis. It demonstrates that the most adverse curvature ductility load angle of SRCCRSC is 180°.Loading angle ( ), axial compression ratio ( ), and the ratio of spacing and diameter of longitudinal reinforcements (s/d) are the principal factors in curvature ductility of SRCTSC subjected to biaxial eccentric compression. It include 36 sets for load angle, 6 sets for axial load ratio, 3 sets for concrete strength, 3 sets for the content of steel, 2 sets for steel style, 3 sets for stirrup ratio, 3 sets for steel location, 3 sets for section size, 3 sets for stirrup diameter about SRCTSC. The ductile behavior of T-shaped, with calculating 1068 loading conditions, are investigated. It concluded that axial load ratio, load angle, and ratio of the spacing of stirrups and longitudinal reinforcement’s diameter (s/d) are most important factors.

Deformation-Based Nonlinear Finite Element Analysis of Steel High Performance Concrete Structural Walls

2012 ◽  
Vol 166-169 ◽  
pp. 797-802
Author(s):  
Ma Kaize
Keyword(s):  
Finite Element ◽  
Bearing Capacity ◽  
Axial Load ◽  
High Performance ◽  
Load Ratio ◽  
Nonlinear Finite Element ◽  
Structural Walls ◽  
Steel Ratio ◽  
Axial Load Ratio ◽  
Characteristic Value

Base on the experiment results of steel high performance reinforced concrete (SHPRC) structural walls, nonlinear finite element(FE) analysis is performed to simulate the complete process of the loading and concrete crack of SHPRC structural walls in the platform of ABAQUS. The nonlinear of material is taken into account in the models. The reliability of the finite element model is verified through the comparison of the analysis results and the experimental results. Based on the proposed model, the parametric analysis is carried out to study the effect of axial load ratio, aspect ratio, stirrup characteristic value, and steel ratio on the seismic behavior of SHPRC structural walls. It is concluded that the bearing capacity of SHPRC structural walls increase with the increase of the axial load ratio, but the deformation decreases obviously. The deformation and bearing capacity of the structural walls are improved by increasing the steel ratio. With increasing the stirrup characteristic value, the deformation of the structural walls improves significantly. The stirrup characteristic values are proposed to ensure the SHPRC structural walls for different axial load ratios meet the deformation capacity of drift ratio of 1/120,1/100 and 1/80, respectively.

Research on Flexural Behaviors of Cementitious Composite Material Formwork without Being Removed Concrete Beams

2010 ◽  
Vol 163-167 ◽  
pp. 2047-2051 ◽  
Author(s):  
Shuang Xi Zhou
Keyword(s):  
Bearing Capacity ◽  
Concrete Beam ◽  
Normal Concrete ◽  
Ordinary Concrete ◽  
Failure Patterns ◽  
Limit Value ◽  
Monotonic Loads ◽  
Flexural Beam ◽  
Deflection Limit ◽  
Current Code

Based on experiments on two beam specimens (one is a concrete beam with a formwork without demoulding, another is a normal concrete beam), the basic mechanical properties of the flexural beam with a formwork without demoulding, in the condition of monotonic loads were studied, including failure patterns, normal section bearing capacities, change rules of deflections, concrete strain of midspan, strain of strengthened reinforcing steer and so on. The comparison of bearing capacity is also made between a concrete beam with a formwork without demoulding and an ordinary concrete beam. The results indicate that by calculating bend-bearing capacity in current code, a beam with a formwork without demoulding is as safe as an ordinary concrete beam, a concrete beam with a formwork without demoulding meets the requirements of deflection limit value. Its bend-bearing capacity is approximate to an ordinary concrete beam.

Analysis on Seismic Performance of Rectangular Thin-Walled Hollow Pier

2014 ◽  
Vol 1065-1069 ◽  
pp. 1451-1456
Author(s):  
Xiao Xiao ◽  
Sheng Bo Liu ◽  
Qi Xu ◽  
Lin Meng
Keyword(s):  
Bearing Capacity ◽  
Seismic Performance ◽  
Axial Load ◽  
Large Scale ◽  
Load Ratio ◽  
Reinforcement Ratio ◽  
Longitudinal Reinforcement ◽  
Skeleton Curve ◽  
Finite Element Software ◽  
Thin Walled

In the thesis, simulated analyses of six large-scale abutments under the low reversed cyclic horizontal load were performed by using the nonlinear finite element software of ABAQUS. The hysteresis behavior, skeleton curve, displacement ductility energy-dissipating capacity of the thin-walled hollow pier under the combined action of the bending, pressing, and shearing were discussed in this thesis. And it also analyzed factors that affect the bearing capacity and ductility of the bridge pier, such as the longitudinal reinforcement ratio, volume-stirrup ratio, the axial load ratio. Results indicate that the volume-stirrup ratio is the principal factor which affects the seismic performance of thin-walled hollow pier. With the increment of volume-stirrup ratio, the ductility factor increases; as the axial load increased, bearing capacity increased correspondingly; when the piers are under higher axial pressure, the longitudinal reinforcement ratio has more significant effect on the bearing capacity of structure.

scholarly journals Experimental Study on the Seismic Performance of Recycled Concrete Hollow Block Masonry Walls

2019 ◽  
Vol 9 (20) ◽  
pp. 4336 ◽  
Author(s):  
Chao Liu ◽  
Xiangyun Nong ◽  
Fengjian Zhang ◽  
Zonggang Quan ◽  
Guoliang Bai
Keyword(s):  
Energy Dissipation ◽  
Bearing Capacity ◽  
Seismic Performance ◽  
Recycled Concrete ◽  
Masonry Walls ◽  
Test Results ◽  
Ordinary Concrete ◽  
Lateral Drift ◽  
Aspect Ratios ◽  
Hollow Block

This paper aims to manufacture recycled concrete hollow block (RCHB) which can be used for the masonry structure with seismic requirements. Five RCHB masonry walls were tested under cyclic loading to evaluate the effect of the axial compression stress, aspect ratio, and the materials of structural columns on the seismic performance. Based on the test results, the failure pattern, hysteresis curves, lateral drift, ductility, stiffness degradation, and the energy dissipation of the specimens were analyzed in detail. The results showed that with the increase of aspect ratios, the ductility of RCHB masonry walls increased, but the horizontal bearing capacity and energy dissipation of RCHB masonry walls decreased. With the increase of compressive stress, the bearing capacity and energy dissipation performance of RCHB masonry walls were improved, and the stiffness degraded slowly. The results also demonstrated that the RCHB masonry walls with structural columns, depending on whether the structural columns were prepared by ordinary concrete or recycled concrete, could increase the bearing capacity, ductility, and energy dissipation of specimens. The research confirmed that RCHB masonry walls could meet the seismic requirements through thoughtful design. Therefore, this study provided a new cleaner production for the utilization of construction waste resources.

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