Experimental investigation of bamboo-concrete composite beams with threaded reinforcement connections

2021 ◽  
pp. 109963622110235
Author(s):  
Yang Wei ◽  
Si Chen ◽  
Junfeng Jiang ◽  
Mengqian Zhou ◽  
Kang Zhao
Keyword(s):  
Composite Structure ◽  
Shear Failure ◽  
Ductile Failure ◽  
Composite Beams ◽  
Experimental Investigations ◽  
Test Results ◽  
Cross Sectional ◽  
Shear Connection ◽  
Flexural Performance ◽  
Service State

A novel bamboo-concrete composite structure with threaded reinforcement connections is presented. Experimental investigations on the shear behavior of the connectors and the flexural performance of the bamboo-concrete composite beams were carried out. The results indicate that the load-slip behavior of the shear connection with threaded reinforcement exhibits good ductility and that its failure mode is ductile failure. The threaded reinforcement provides an efficient connection before the initial shear failure. The load-displacement curves of the bamboo-concrete composite beams are close to those of the full composite structure, and the midspan displacement is greatly reduced under the same load compared with that of the contrast bamboo beams. The loads PL/250 and PL/300, corresponding to the midspan deflections of L/250 and L/300 ( L is the span of the beams) of the composite beams, increase by averages of 3.36 times and 3.71 times, respectively, compared to those of the contrast bamboo beams. The load-bearing performance of the beams in the service state is greatly improved. Based on the equivalent cross-sectional stiffness calculated using the γ-method with a reduction of 0.80, the calculated results of the displacement are in good agreement with the test results.

FIRE RESISTACE OF SHEAR CONNECTORS FOR COMPOSITE BEAMS

2020 ◽  
Vol 92 (6) ◽  
pp. 59-65
Author(s):  
G.P. TONKIH ◽  
◽  
D.A. CHESNOKOV ◽  
◽  
Keyword(s):  
Fire Resistance ◽  
Composite Structure ◽  
Composite Structures ◽  
Composite Beams ◽  
Design Codes ◽  
Connection Strength ◽  
Shear Connectors ◽  
Shear Connection ◽  
Capacity Reduction ◽  
Russian Research

Most of Russian research about composite structure fire resistance are dedicated to the composite slab behavior. The composite beams fire resistance had been never investigated in enough volume: the temperature evaluation within the scope of the actual Russian design codes leads to the significant reduction in the shear connection strength. Meanwhile, there no correlation between the strength decreasing and type of the shear connection. The article provides an overview of the relevant researches and offers some approaches which could take into account bearing capacity reduction of the shear connectors within composite structures design.

scholarly journals Test and Numerical Model of Curved Steel–Concrete Composite Box Beams under Positive Moments

Materials ◽  
2021 ◽  
Vol 14 (11) ◽  
pp. 2978
Author(s):  
Zhi-Min Liu ◽  
Xue-Jin Huo ◽  
Guang-Ming Wang ◽  
Wen-Yu Ji
Keyword(s):  
Finite Element ◽  
Static Loading ◽  
Composite Beams ◽  
Parameter Analysis ◽  
Outer Side ◽  
Finite Element Models ◽  
Test Results ◽  
Rotational Angle ◽  
Shear Connection ◽  
Box Beams

Compared with straight steel–concrete composite beams, curved composite beams exhibit more complicated mechanical behaviors under combined bending and torsion coupling. There are much fewer experimental studies on curved composite beams than those of straight composite beams. This study aimed to investigate the combined bending and torsion behavior of curved composite beams. This paper presents static loading tests of the full elastoplastic process of three curved composite box beams with various central angles and shear connection degrees. The test results showed that the specimens exhibited notable bending and torsion coupling force characteristics under static loading. The curvature and interface shear connection degree significantly affected the force behavior of the curved composite box beams. The specimens with weak shear connection degrees showed obvious interfacial longitudinal slip and transverse slip. Constraint distortion and torsion behavior caused the strain of the inner side of the structure to be higher than the strain of the outer side. The strain of the steel beam webs was approximately linear. In addition, fine finite element models of three curved composite box beams were established. The correctness and applicability of the finite element models were verified by comparing the test results and numerical calculation results for the load–displacement curve, load–rotational angle curve, load–interface slip curve, and cross-sectional strain distribution. Finite element modeling can be used as a reliable numerical tool for the large-scale parameter analysis of the elastic–plastic mechanical behavior of curved composite box beams.

scholarly journals Flexural Performance Evaluation of Novel Wide Long-Span Composite Beams Used to Construct Lower Parking Structures

2019 ◽  
Vol 12 (1) ◽  
pp. 98
Author(s):  
Yun-Chul Choi ◽  
Doo-Sung Choi ◽  
Keum-Sung Park ◽  
Kang-Seok Lee
Keyword(s):  
Flexural Strength ◽  
Composite Beams ◽  
Steel Beams ◽  
Test Results ◽  
Element Analysis ◽  
Bending Tests ◽  
Flexural Performance ◽  
Long Span ◽  
Global And Local ◽  
Good Agreement

Efficient parking structures are urgently required in Korea. The design of parking structures more than 8 m in height is difficult because both fire and seismic resistance must be considered. Existing designs are uneconomical and conservative. However, the design of parking structures less than 8 m in height is relatively simple and there are few restrictions to the construction. It is essential to optimize the design of parking structures less than 8 m in height. Here, we describe novel wide long-span composite beams that reduce the story height of low parking structures. The flexural capacity of seven of the beams was evaluated; all beams were loaded at two points prior to monotonic bending tests. We also performed finite element analysis (FEA) based on the material properties of the test specimens, and compared the results to those of the structural tests. The flexural strength of the wide composite steel beams increased by approximately 20% as the steel thickness rose by 3 mm, from 6 to 9 mm. The rebar shape (triangular or rectangular) did not affect flexural strength. The flexural strength of beams without rebar was 10% less than that of beams with rebar. The FEA and test results were in good agreement. The section plastic moments were free from global and local instability.

Tests on Shear Studs Using Profiled Steel Sheeting Subjected to Cyclic Loading

2014 ◽  
Vol 578-579 ◽  
pp. 196-200
Author(s):  
Jian Sheng Fan ◽  
Wen Liu
Keyword(s):  
Shear Strength ◽  
Shear Failure ◽  
Ultimate Load ◽  
Shear Resistance ◽  
Composite Beams ◽  
Steel Beams ◽  
Test Results ◽  
Design Specifications ◽  
Loading Patterns ◽  
Push Out

Push-out tests were conducted to study the performance of shear studs in composite beams with profiled sheeting. All stud specimens were through-deck welded on steel beams. Three variables, i.e. the presence of profiled sheeting, the direction of the steel sheeting and the loading patterns were studied. Comparison between test results and predictions according to design specifications were also proposed. The research shows that, direction of the profiled steel sheeting has little influence on the ultimate load with shank shearing failure; shear failure of concrete rib decreases the shear strength; and the shear resistance of a parallel concrete rib is about twice of a transverse one.

Experimental Research on Flexural Performance of Prestressed Composite Beam with Partial Shear Connection

2011 ◽  
Vol 80-81 ◽  
pp. 596-600
Author(s):  
Xiang Fei Ye ◽  
Shao Wei Hu
Keyword(s):  
Composite Beam ◽  
Least Square Method ◽  
Composite Beams ◽  
Least Square ◽  
Static Properties ◽  
Deformation And Failure ◽  
Failure Patterns ◽  
Shear Connection ◽  
Flexural Performance ◽  
Bending Capacity

In order to research that how the degree of shear connection influence the static properties of composite beams such as the relative slip on the interface、bearing capacity and failure mode, four prestressed composite beams with different the degree of shear connection were designed, and were loaded on the two symmetric position. The paper described and analyzed the bending behaviors of prestressed composite beam such as the strain distribution of sections、interface slip、deformation and failure patterns on the base of the experimental results. In addition, the paper revised the calculating formulas of the ultimate bending capacity of composite beams with partial shear connection in Eurocode 4 with the least square method combined with test results of domestic and overseas about seven composite beams. The results showed that the correction values were corresponding well with experimental data and the engineering accuracy.

Strength and Stiffness of Corrugated Rib Connector

2011 ◽  
Vol 243-249 ◽  
pp. 1497-1503
Author(s):  
Qing Tian Su ◽  
Dong Fang Wang
Keyword(s):  
Mechanical Properties ◽  
Shear Strength ◽  
Composite Structure ◽  
Ultimate Load ◽  
Shear Stiffness ◽  
Test Results ◽  
New Type ◽  
Strength And Stiffness ◽  
Service State ◽  
Push Out

Connectors are the key element in steel and concrete composite structure. To research and develop new type connector for steel and concrete composite structure, a new type connector, corrugated rib connector, was developed. The base mechanical properties of this connector were tested by push-out tests. The test results shown the mechanical properties of this connector are excellent. Comparing to the push-out test results of perfobond rib connector, the shear strength of corrugated rib connector increased 24 percent than that of the perfobond rib connector, and the shear stiffness of corrugated rib connector is larger than that of the perfobond rib connector, Especially the ductility of corrugated rib connector is 1.9 times that of the perfobond rib connector when they reach the ultimate load. Based on the load-slip relation of corrugated rib connector by push-out tests, relative stiffness expressions under normal service state and ultimate bearing capacity state are obtained.

Flexural Performance of CFRP-Bamboo Scrimber Composite Beams

2019 ◽  
Vol 7 (12) ◽  
pp. 1295-1307
Author(s):  
Xizhi Wu ◽  
Xueyou Huang ◽  
Xianjun Li ◽  
Yiqiang Wu
Keyword(s):  
Composite Beams ◽  
Flexural Performance ◽  
Bamboo Scrimber

FAKTOR PERSONAL YANG BERHUBUNGAN DENGAN KOMITMEN ORGANISASI PERAWAT RSUD EMBUNG FATIMAH BATAM

2020 ◽  
Vol 5 (3) ◽  
pp. 875
Author(s):  
Asfri Sri Rahmadeni
Keyword(s):  
Organizational Commitment ◽  
Turnover Rate ◽  
Sampling Technique ◽  
Hospital Nurses ◽  
Test Results ◽  
Personal Factors ◽  
High Turnover ◽  
Chi Square ◽  
Cross Sectional ◽  
Chi Square Test

<p class="Normal1"><em>Commitment is the attitude or behavior of likes or dislikes shown by someone against the organization at work. Indonesia is recorded as a nurse who has a low organizational commitment (76%) so it harms services. This phenomenon in the hospital can be seen from the indicator of the high turnover rate of nurses which reaches 30.9% which exceeds the standard &lt;5%. Many factors affect organizational commitment. The purpose of this study was to analyze the Personal Factors Associated with Organizational Commitment of Hospital Nurses. This study is a cross-sectional analytic study and purposive sampling technique with a sample of 59 nurses. Chi-Square test results obtained personal factors that have a relationship with organizational commitment Nurse Hospital is age with p = 0,000 and education with p = 0,000, personal factors not related to organizational commitment are gender p = 1,053 and years of service with p = 1,147. Hospitals should conduct research/surveys on Organizational Commitment periodically as an evaluation material in the context of the organization's development and development in the future</em>.</p>

Faktor yang Berhubungan dengan Penggunaan Partograf dalam Persalinan oleh Bidan Praktik Mandiri

2020 ◽  
Vol 2 (2) ◽  
pp. 72-80
Author(s):  
Niluh Nita Silfia
Keyword(s):  
Total Population ◽  
Sampling Technique ◽  
Population Data ◽  
Statistical Test ◽  
Influential Factor ◽  
Test Results ◽  
Cross Sectional ◽  
Factors Associated ◽  
Survey Results ◽  
Research Criteria

Partographs are guidelines for childbirth observations that will facilitate labor assistants in first identifying emergency cases and complications for mothers and fetuses. Preliminary survey at the Sigi Community Health Sub-Center (Pustu) of the 8 Pustu midwives found two midwives (25%) to complete a complete partograph, six midwives (75%) incomplete. The purpose of this study was to determine the determinant factors associated with the use of partographs in labor. The design of this study used observational analytic methods with a cross-sectional approach. 24 BPM survey results were obtained with 30 samples of midwives who met the research criteria and data completeness. The sampling technique was by the total population. Data analysis used logistic regression. The multivariate analysis results showed that APN training was the most influential factor in the use of partographs in labor by midwives. Statistical test results obtained a POR value of 37.7 (95% CI 12.1 - 60.2). This study suggests that midwives must have APN certificates to be valid in providing services.

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