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.

Shake Table Test on Rammed Earth Wall Panels

2010 ◽  
Vol 133-134 ◽  
pp. 795-799
Author(s):  
Rong Rong Hu ◽  
Yu Jiang Dong
Keyword(s):  
Rural Areas ◽  
Structural Integrity ◽  
Dynamic Testing ◽  
Low Cost ◽  
Western China ◽  
Rammed Earth ◽  
Shake Table ◽  
Seismic Capacity ◽  
Wall Panels ◽  
Rammed Earth Wall

Traditional Rammed earth houses, which possess people traditional cultures, are still widespread in rural areas of western China. However, the earth houses damage is usually serious due to its poor seismic resistance. A simple and low-cost method to reinforce the rammed earth wall is put forward in the paper. In order to test the reinforcement effectiveness, shake table testing for both the wall panels with and without structural reinforcements have been carried out. The performances of the wall panels during dynamic testing are presented and discussed briefly. The result of the test demonstrated the effectiveness of the reinforcement method on improving the seismic capacity of the rammed earth wall. The reinforcement can restrain the crack development and increase the structural integrity of the wall panels. The method can be applied to both existing and new building rammed earth houses.

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.

scholarly journals Cyclic Behavior of Confined Cement-Stabilized Rammed Earth Walls

2018 ◽  
Vol 2018 ◽  
pp. 1-11
Author(s):  
Xinlei Yang ◽  
Hailiang Wang ◽  
Ziliang Zhao
Keyword(s):  
Active Regions ◽  
Embodied Energy ◽  
Cyclic Behavior ◽  
Rammed Earth ◽  
Indoor Environments ◽  
Test Results ◽  
Rammed Earth Wall ◽  
Earth Walls ◽  
Moisture Buffering ◽  
Strength And Ductility

Rammed earth is widely utilized in both developed and developing countries due to its low embodied energy and good natural moisture buffering of indoor environments. However, its application in seismic active regions was limited owing to its intrinsically low resistance to dynamic actions. This paper presents the test results of four cement-stabilized rammed earth walls with confining tie-column elements under cyclic loading, aiming at assessing the cyclic behavior of proposed rammed earth walls with confining tie-column elements. The test results revealed that the proposed confining tie-column elements could significantly improve the cyclic behavior of cement-stabilized rammed earth wall, exhibiting good strength and ductility.

Seismic performance test of rammed earth wall with different structural columns

2020 ◽  
Vol 24 (1) ◽  
pp. 107-118
Author(s):  
Tiegang Zhou ◽  
Zaiyu Zhang ◽  
Zhifan Su ◽  
Peng Tian
Keyword(s):  
Energy Dissipation ◽  
Seismic Performance ◽  
Performance Test ◽  
Construction Material ◽  
Steel Tube ◽  
Western China ◽  
Rammed Earth ◽  
Rammed Earth Wall ◽  
Energy Dissipation Capacity ◽  
Square Steel Tube

Rammed earth wall load-bearing dwellings are widely distributed in western China. Rammed earth has the advantages of warm in winter and cool in summer, and it is a kind of sustainable construction material. In recent years, in previous earthquakes, the collapse of rammed earth buildings is serious, resulting in huge losses of personnel and property. To improve the seismic performance of rammed earth buildings and retain the characteristics of local buildings, a reinforcement measure with additional structural columns is proposed in this article. Three kinds of structural columns are designed, which are cast-in-place concrete, square steel tube, and concrete-filled square steel tube core column. Through the quasi-static experimental study on the rammed earth wall, the effects of different structural columns on the failure shape, bearing capacity, deformation capacity, and energy dissipation capacity of the wall are compared. The test results show that adding structural columns on both sides of the wall can effectively restrain the rammed earth wall, restrain its brittle failure, significantly improve the energy dissipation capacity of the wall, and obviously improve the seismic performance of the wall. This measure is applicable to rammed earth buildings and provides theoretical support for improving the seismic performance of traditional dwellings.

scholarly journals Low-cost diagnostic test for susceptible and drug-resistant tuberculosis in rural Malawi

2018 ◽  
Vol 7 (1) ◽  
Author(s):  
Annie Zhang ◽  
Enoch Jumbe ◽  
Robert Krysiak ◽  
Sabeen Sidiki ◽  
Holden V. Kelley ◽  
...  
Keyword(s):  
Pulmonary Tuberculosis ◽  
Rural Areas ◽  
Low Cost ◽  
Drug Susceptibility ◽  
Multidrug Resistant ◽  
Health Clinic ◽  
Drug Resistant ◽  
Test Results ◽  
Active Pulmonary Tuberculosis ◽  
Rural Settings

Background: Rural settings where molecular tuberculosis diagnostics are not currently available need easy-to-use tests that do not require additional processing or equipment. While acid-fast bacilli (AFB) smear is the most common and often only tuberculosis diagnosis test performed in rural settings, it is labour intensive, has less-than-ideal sensitivity, and cannot assess tuberculosis drug susceptibility patterns. Objective: The objective of this study was to determine the feasibility of a multidrug-resistant (MDR) or extensively drug-resistant (XDR)-tuberculosis coloured agar-based culture test (tuberculosis CX-test), which can detect Mycobacterium tuberculosis growth and evaluate for drug susceptibility to isoniazid, rifampicin and a fluoroquinolone (i.e. ciprofloxacin) in approximately 14 days. Method: In this study, 101 participants were enrolled who presented to a rural health clinic in central Malawi. They were suspected of having active pulmonary tuberculosis. Participants provided demographic and clinical data and submitted sputum samples for tuberculosis testing using the AFB smear and tuberculosis CX-test. Results: The results showed a high level of concordance between the AFB smear (12 positive) and tuberculosis CX-test (13 positive); only one sample presented discordant results, with the molecular GeneXpert MTB/RIF® test confirming the tuberculosis CX-test results. The average time to a positive tuberculosis CX-test was 10 days. Of the positive samples, the tuberculosis CX-test detected no cases of drug resistance, which was later confirmed by the GeneXpert MTB/RIF®. Conclusion: These findings demonstrate that the tuberculosis CX-test could be a reliable low-cost diagnostic method for active pulmonary tuberculosis in high tuberculosis burden rural areas.

scholarly journals The gender gap among school children in poor rural areas of western China: evidence from a multi-province dataset

2016 ◽  
Vol 15 (1) ◽  
Author(s):  
Hua Zhou ◽  
Di Mo ◽  
Chengchao Zhou ◽  
Alexis Medina ◽  
Yaojiang Shi ◽  
...  
Keyword(s):  
Gender Gap ◽  
School Children ◽  
Rural Areas ◽  
Western China

Improving rammed earth wall thermal performance with added expanded granulated cork

2015 ◽  
Vol 58 (4) ◽  
pp. 314-323 ◽  
Author(s):  
J.J. Correia da Silva ◽  
João P.B. Pereira ◽  
Jorge Sirgado
Keyword(s):  
Thermal Performance ◽  
Rammed Earth ◽  
Rammed Earth Wall

scholarly journals In-Plane Strengthening Effect of Prefabricated Concrete Walls on Masonry Structures: Shaking Table Test

2017 ◽  
Vol 2017 ◽  
pp. 1-13 ◽  
Author(s):  
Weiwei Li ◽  
Weiqing Liu ◽  
Shuguang Wang ◽  
Dongsheng Du
Keyword(s):  
Shaking Table Test ◽  
Masonry Structure ◽  
Shaking Table ◽  
Strengthening Effect ◽  
Masonry Structures ◽  
Dynamic Tests ◽  
Seismic Capacity ◽  
Concrete Walls ◽  
Improvement Effect ◽  
Scaled Models

The improvement effect of a new strengthening strategy on dynamic action of masonry structure, by installing prefabricated concrete walls on the outer facades, is validated by shaking table test presented in this paper. We carried out dynamic tests of two geometrically identical five-story reduced scaled models, including an unstrengthened and a strengthened masonry model. The experimental analysis encompasses seismic performances such as cracking patterns, failure mechanisms, amplification factors of acceleration, and displacements. The results show that the strengthened masonry structure shows much more excellent seismic capacity when compared with the unstrengthened one.

Maternal health services in China’s western rural areas: uptake and correlates

2016 ◽  
Vol 8 (2) ◽  
Author(s):  
Chengfang Liu ◽  
Linxiu Zhang ◽  
Yaojiang Shi ◽  
Huan ZHOU ◽  
Alexis Medina ◽  
...  
Keyword(s):  
Public Health ◽  
Maternal Health ◽  
Health Services ◽  
Health Systems ◽  
Uptake Rate ◽  
Rural Areas ◽  
Design Methodology ◽  
Maternal Health Services ◽  
Western China ◽  
Public Health Systems

Purpose Many public health systems have struggled with the dual questions of (1) why the uptake rate of maternal health services is low among some subpopulations; and (2) how to raise it. The objective of this study is to assess the uptake rate of a new set of maternal health services in poor rural areas of China. Design/methodology/approach The analysis is based on the survey responses of women’s representatives and village cadres from almost 1000 villages in June 2012 as part of a wide-scale public health survey in Sichuan, Gansu and Yunnan provinces in the western part of China. Findings We find that the uptake rate of maternal health services (including in-hospital delivery, antenatal care visits and post-partum care visits) in poor rural areas of western China are far below average in China, and that the rates vary across provinces and ethnic groups. Our analyses demonstrate that distance, income, ethnicity and availability appear to be systematically correlated with low uptake rates of all maternal health services. Demand-side factors seem to be by far the most important sources of the differences between subpopulations. We also find that there is potential for creating a Conditional Cash Transfer program to improve the usage of maternal health services. Originality/value We believe that our results will contribute positively to the exploration of answers to the dual questions that many public health systems have struggled with (1) why the uptake rate of maternal health services is low among some subpopulations; and (2) how to raise it.

A Mechatronic Approach to Compact Fluid Disc Valve Design

1995 ◽  
Vol 209 (2) ◽  
pp. 115-125
Author(s):  
G A Parker ◽  
Y B Sun
Keyword(s):  
Low Cost ◽  
Dynamic Performance ◽  
Operating Mode ◽  
Industrial Applications ◽  
Test Results ◽  
Valve Design ◽  
Electromagnetic Characteristics ◽  
High Control ◽  
Fail Safe ◽  
Pilot Valve

The work presented in this paper deals mainly with a mechatronic approach to compact disc valve design and concentrates on improvements to the disc valve electromagnetic characteristics, the diaphragm design and the dynamic performance. A novel diaphragm-disc force motor has been successfully developed incorporating a pair of permanent ring magnets. It has the advantages of low electric power consumption at the null position, dual-lane electrical structure for fail-safe operation, high control accuracy and should be competitive with existing torque motors due to its low cost and simple construction. The research involved designing and testing a prototype disc pilot valve with a dual-lane operating mode. The test results showed that the valve has satisfactory static and dynamic characteristics for industrial applications.

Sign in / Sign up

Export Citation Format

Share Document