scholarly journals Seismic Behavior of Rammed Earth Walls with Precast Concrete Tie Columns

2018 ◽  
Vol 2018 ◽  
pp. 1-10
Author(s):  
Xinlei Yang ◽  
Hailiang Wang
Keyword(s):  
Rural Areas ◽  
Seismic Behavior ◽  
Precast Concrete ◽  
Rammed Earth ◽  
Deformation Capacity ◽  
Test Results ◽  
Load Bearing ◽  
Displacement Ductility ◽  
Reversed Cyclic ◽  
Earth Walls

Rammed earth (RE) constructions are widespread in underdeveloped rural areas in developing countries. However, these RE constructions are often susceptible to earthquake damage due to their poor seismic performance. Precast concrete tie columns and ring beam (tie bars) were proposed to improve the seismic behavior of RE constructions. Four RE walls, including a traditional RE wall and three RE walls with precast concrete tie columns and ring beam (tie bars), were tested under reversed cyclic loading, and the seismic behavior of these tested specimens was evaluated in terms of failure pattern, energy dissipation, displacement ductility, and stiffness degradation. The results showed that a significant increase of the load-bearing and deformation capacity could be achieved with the application of precast concrete tie columns in combination with RE. The load-bearing capacity and deformation capacity of traditional RE wall were increased by an average of 113% and 417%, respectively. These test results could provide reference to the design and construction of the environmental-friendly structures in rural areas.

Experimental study of precast beam-to-column joints with steel connectors under cyclic loading

2020 ◽  
Vol 23 (13) ◽  
pp. 2822-2834
Author(s):  
Xian Rong ◽  
Hongwei Yang ◽  
Jianxin Zhang
Keyword(s):  
Energy Dissipation ◽  
Cyclic Loading ◽  
Load Capacity ◽  
Precast Concrete ◽  
Displacement Ductility ◽  
Reversed Cyclic Loading ◽  
Column Joint ◽  
Energy Dissipation Capacity ◽  
Reversed Cyclic ◽  
The Web

This article investigated the seismic performance of a new type of precast concrete beam-to-column joint with a steel connector for easy construction. Five interior beam-to-column joints, four precast concrete specimens, and one monolithic joint were tested under reversed cyclic loading. The main variables were the embedded H-beam length, web plate or stiffening rib usage, and concrete usage in the connection part. The load–displacement hysteresis curves were recorded during the test, and the behavior was investigated based on displacement ductility, deformability, skeleton curves, stiffness degradation, and energy dissipation capacity. The results showed that the proposed beam-to-column joint with the web plate in the steel connector exhibited satisfactory behavior in terms of ductility, load capacity, and energy dissipation capacity under reversed cyclic loading, and the performance was ductile because of the yielding of the web plate. Therefore, the proposed joint with the web plate could be used in high seismic regions. The proposed joint without the web plate exhibited similar behavior to the monolithic specimen, indicating that this joint could be used in low or moderate seismic zones. Furthermore, the utilization of the web plate was vital to the performance of this system.

Experimental Investigations on the Seismic Behavior of Precast Concrete Columns with Novel Box Connections

2019 ◽  
Vol 14 (02) ◽  
pp. 2050007
Author(s):  
Xizhi Zhang ◽  
Shengbo Xu ◽  
Shaohua Zhang ◽  
Gaodong Xu
Keyword(s):  
Energy Dissipation ◽  
Bearing Capacity ◽  
Failure Mode ◽  
Seismic Behavior ◽  
Load Transfer ◽  
Precast Concrete ◽  
Hysteretic Behavior ◽  
Experimental Investigations ◽  
Test Results ◽  
Energy Dissipation Capacity

In this study, two types of novel box connections were developed to connect precast concrete (PC) columns and to ensure load transfer integrity. Cyclic loading tests were conducted to investigate the seismic behavior of the PC columns with proposed connections as well as the feasibility and reliability of novel box connections. The failure mode, hysteretic behavior, bearing capacity, ductility, stiffness degradation and energy dissipation were obtained and discussed. The test results indicated that the all PC columns exhibited the ductile flexural failure mode and that the proposed connections could transfer the force effectively. The adoption of novel box connections could improve the deformation capacity and energy dissipation capacity of PC columns. A higher axial compression ratio could enhance the bearing capacity of PC column with proposed connection but would significantly deteriorate the ductility and energy dissipation capacity. Finite element models were developed and the feasibility of the models was verified by the comparison with the test results.

Analysis and Test on Indoor Thermal Environment of Tibetan-Style Dwellings of Different Materials

2011 ◽  
Vol 255-260 ◽  
pp. 1632-1638 ◽  
Author(s):  
Li Ping Li
Keyword(s):  
Physical Environment ◽  
Thermal Environment ◽  
Field Tests ◽  
Building Envelope ◽  
Rammed Earth ◽  
Test Results ◽  
Indoor Temperature ◽  
Temperature Changes ◽  
Indoor Thermal Environment ◽  
Earth Walls

Field tests for indoor thermal environment of Tibetan-style dwellings of different materials in Shangri-La in winter were carried out from the perspective of physical environment of buildings, and more specifically, the indoor temperature of Tibetan-style dwellings with rammed earth walls and brick walls as well as the surface temperature of building envelope were tested and comparatively analyzed. The test results show the current situations and features of indoor temperature changes of Tibetan-style dwellings of different materials, which may provide a basis for improving the thermal environment of Tibetan-style dwellings.

Experimental Study on Seismic Behavior of Double-Wall Precast Concrete Shear Wall

2014 ◽  
Vol 919-921 ◽  
pp. 1812-1816 ◽  
Author(s):  
Quan Dong Xiao ◽  
Zheng Xing Guo
Keyword(s):  
Energy Dissipation ◽  
Seismic Behavior ◽  
Failure Modes ◽  
Precast Concrete ◽  
Shear Walls ◽  
Shear Wall ◽  
Initial Stiffness ◽  
Displacement Ductility ◽  
Energy Dissipation Capacity ◽  
Double Wall

To study the seismic behavior of Double-Wall Precast Concrete (DWPC) shear wall, three full scale specimens are tested and compared under low-cyclic reversed loading, including two DWPC shear walls and one normal Cast-In-Situ (CIS) shear wall. By observing their experimental phenomena and failure modes, contrasting their displacement ductility coefficients, hysteretic curves, skeleton curves and energy dissipation capacity, the seismic behavior were synthetically evaluated on aspects of strength, stiffness, ductility and energy dissipation. Compared with CIS specimen, DWPC specimens have higher initial stiffness, increased cracking loads by 43% to 47%, and the ultimate loads increased by 22% to 23%. The displacement ductility ratios also meet the ductility requirements with value of 5. The hysteretic curves of three specimens are plump, and the trend of skeleton curves is basically the same. The DWPC specimens demonstrated a good energy dissipation capacity. All the specimens had shown favorable seismic performance.

scholarly journals Assessing the Seismic Behavior of Rammed Earth Walls with an L-Form Cross-Section

2019 ◽  
Vol 11 (5) ◽  
pp. 1296 ◽  
Author(s):  
Quoc-Bao Bui ◽  
Tan-Trung Bui ◽  
Mai-Phuong Tran ◽  
Thi-Loan Bui ◽  
Hoang-An Le
Keyword(s):  
Cross Section ◽  
Seismic Performance ◽  
Seismic Behavior ◽  
Rectangular Cross Section ◽  
Construction Material ◽  
Numerical Approach ◽  
Rammed Earth ◽  
3D Fem ◽  
Earthquake Performance ◽  
Earth Walls

Rammed earth (RE) is a construction material which is made by compacting the soil in a formwork. This material is attracting the attention of the scientific community due to its sustainable characteristics. Among different aspects to be investigated, the seismic performance remains an important topic which needs advanced investigations. The existing studies in the literature have mainly adopted simplified approaches to investigate the seismic performance of RE structures. The present paper adopts a numerical approach to investigate the seismic behavior of RE walls with an L-form cross-section. The 3D FEM model used can take into account the plasticity and damage of RE layers and the interfaces. The model was first validated by an experimental test presented in the literature. Then, the model was employed to assess the seismic performance of a L-form wall of a RE house at different amplitudes of earthquake excitations. Influences of the cross-section form on the earthquake performance of RE walls were also investigated. The results show that the L-form cross-section wall has a better seismic performance than a simple rectangular cross-section wall with similar dimensions. For the L-form cross-section wall, the damage observed concentrates essentially on the connection between two flanges of the wall.

Implications of Experiments on the Seismic Behavior of Gravity Load Designed RC Beam-to-Column Connections

1996 ◽  
Vol 12 (2) ◽  
pp. 185-198 ◽  
Author(s):  
Attila Beres ◽  
Stephen P. Pessiki ◽  
Richard N. White ◽  
Peter Gergely
Keyword(s):  
Reinforced Concrete ◽  
Seismic Behavior ◽  
Test Results ◽  
Joint Shear Strength ◽  
Cornell University ◽  
Gravity Load ◽  
Concrete Building ◽  
Load Effects ◽  
Definition Of ◽  
Reversed Cyclic

This paper summarizes recent experimental research at Cornell University conducted on the behavior of gravity load designed reinforced concrete building frame components subjected to reversing cyclic loads (simulated seismic effects). Reinforced concrete framing systems, designed primarily for gravity loads, with little or no attention given to lateral load effects, are typically characterized by non-ductile reinforcing details in the joint regions and in the members. The seismic response of connection regions for gravity load design (GLD) frames has received relatively little attention in earlier studies, thus making it difficult to reliably evaluate GLD frames and to properly plan repair or retrofit strategies. Thirty-four full scale bare interior and exterior beam-to-column joints have been tested under reversed cyclic bending to identify the different damage mechanisms and to study the effect of critical details on strength and deformations. The discussion of test results focuses on the definition of joint shear strength factors for GLD frames to complement those provided by ACI-ASCE Committee 352 for frames designed with better details.

Analysis for the Shake Table Test of Rammed Earth Wall Panels

2010 ◽  
Vol 168-170 ◽  
pp. 21-25
Author(s):  
Rong Rong Hu ◽  
Yu Jiang Dong ◽  
Xing Hu Zhang
Keyword(s):  
Rural Areas ◽  
Low Cost ◽  
Western China ◽  
Rammed Earth ◽  
Shake Table ◽  
Test Results ◽  
Dynamic Tests ◽  
Seismic Capacity ◽  
Wall Panels ◽  
Rammed Earth Wall

Traditional Rammed earth houses are still widespread in rural areas of western China. However, the seismic damage of earth houses is usually serious due to its poor seismic resistance and little research has been conducted on dynamic tests of rammed earth structure. A simple and low-cost method to reinforce the rammed earth wall is put forward in the paper. The shake table testing for both the wall panels with and without reinforcements has been carried out. The test results are analyzed from the aspects of damage phenomenon, dynamic behavior, and acceleration and displacement responses of both specimens. The results show the effectiveness of the reinforcement method on improving the seismic capacity of the rammed earth wall.

scholarly journals Use of Cement Stabilized Rammed Earth for Load Bearing Wall with Appropriate Finishes-Case Study

2018 ◽  
Vol 8 (02) ◽  
Author(s):  
G.W. T.C. Kandamby
Keyword(s):  
Concrete Beams ◽  
High Strength ◽  
Rammed Earth ◽  
Strength Parameters ◽  
Load Bearing ◽  
House Construction ◽  
Reinforced Cement ◽  
Strength And Durability ◽  
Earth Walls

Rammed earth is one of the traditional technology used for putting up houses in most parts of the world and it is being now rapidly developed through researches due to its valuable qualities especially strength, durability, environmental friendly and affordability. As a result, cement has been introduced as a stabilizer to gain high strength and durability. Local building codes and guidelines have been established to design and construct rammed earth walls successfully in buildings. Aim of this paper is to demonstrate the application of cement stabilized rammed earth for making load bearing walls of two storey house combining with reinforced cement concrete beams, lintels, slab and stairway. These walls have been structurally designed by following the code of engineering design of earth buildings NZS 4297:1998 published by New Zealand and applying strength parameters derived for local soils. House construction was totally completed in 2015 with smooth and rough wall finishes for internal and external surfaces of walls to get the good appearance to the house.

Experimental Study on Improving Seismic Performance of Load-Bearing Masonry Walls Made of Autoclaved Aerated Concrete

2013 ◽  
Vol 671-674 ◽  
pp. 661-667
Author(s):  
Jing Hai Yu ◽  
Jian Feng Cao ◽  
Tian Hui Fei
Keyword(s):  
Experimental Study ◽  
Seismic Performance ◽  
Engineering Practice ◽  
Masonry Walls ◽  
Load Bearing ◽  
Displacement Ductility ◽  
Block Wall ◽  
Aerated Concrete ◽  
Constructional Column ◽  
Reversed Cyclic

Experiments of a piece of comparable block wall and five pieces of block walls with different constructional type subjected to low reversed cyclic loading have been conducted. Investigation has been made on the failure pattern, hysteretic loop curves, displacement-restoring capacity and displacement ductility of walls. The experimental results revealed that the seismic performance of block masonry walls, which used the constructional column and concrete strips, was improved remarkably. It set a sound basis for further analysis research and engineering practice on AAC load-bearing walls in the future.

Experimental Research on the Seismic Behavior of the SRC Short-Pier Shear Wall with Layered Braces Structures

2011 ◽  
Vol 368-373 ◽  
pp. 2041-2044
Author(s):  
Wen Wu Lan ◽  
Xiu Ning Peng ◽  
Xiao Hua Huang ◽  
Yu Lei
Keyword(s):  
Reinforced Concrete ◽  
Bearing Capacity ◽  
Seismic Performance ◽  
Axial Load ◽  
Seismic Behavior ◽  
Shear Wall ◽  
Displacement Ductility ◽  
Steel Reinforced Concrete ◽  
New Type ◽  
Reversed Cyclic

A new type of construction employing shaped steels as boundary elements and layered braces of RC(Reinforced Concrete) short-pier shear wall is put forward. The braces are in X shape and are erected in a multi-storied form. They are embedded in the boundary zone and the web of SRC (Steel Reinforced Concrete) short-pier shear wall respectively to make it possible to improve the bearing capacity and ductility of this shear wall and to improve its seismic performance. Three half-scale specimens of the SRC short-pier shear wall are tested under reversed cyclic loading. High design axial load radio of 0.5 is used. The failure processes and modes of the specimens are observed. The law about bearing capacity and displacement ductility of the specimens influenced by the layered braces structures is revealed. The experimental results show that the displacement ductility is closely related to the amount of stories of braces. The specimens with layered braces structures have better ductility and larger bearing capacity, and therefore the layered braces structures effectively improve the seismic performance of the SRC short-pier shear wall.

Sign in / Sign up

Export Citation Format

Share Document