Experimental study of moment carrying behavior of typical Tibetan timber beam-column joints

2021 ◽  
pp. 136943322110015
Author(s):  
Ting Guo ◽  
Na Yang ◽  
Huichun Yan ◽  
Fan Bai
Keyword(s):  
Bending Moment ◽  
Structural Performance ◽  
Test Results ◽  
Timber Beam ◽  
Rotational Stiffness ◽  
Trilinear Model ◽  
Column Joint ◽  
Loading Tests ◽  
The Moment ◽  
Relationship Of

This study aimed to investigate the moment carrying behavior of typical Tibetan timber beam-column joints under monotonic vertical static load and also evaluate the influence of length ratio of Gongmu to beam (LRGB) and dowels layout on the structural performance of the joint. Six full-scale specimens were fabricated with same construction but different Gongmu length and dowels position. The moment carrying performance of beam-column joints in terms of failure mode, moment resistance, and rotational stiffness of joints were obtained via monotonic loading tests. Test results indicated that all joints are characterized by compressive failure perpendicular to grain of Ludou. Additionally, it was found that greater LRGB leads to greater initial rotational stiffness and maximum moment of the joint by an increase of restraint length for beam end; however, offsetting dowels toward column resulted smaller stiffness and ultimate bending moment of joints, particularly, offsetting Beam-Gongmu dowels toward column changed the moment-rotation curve pattern of the beam-column joint, accompanied by a hardening stiffness at last phase. Furthermore, a simplified trilinear model was proposed to represent the moment-rotation relationship of the typical Tibetan timber beam-column joint.

Experimental investigation on the structural performance of a reinforced cold-formed steel beam–column joint

2018 ◽  
Vol 45 (12) ◽  
pp. 1027-1039 ◽  
Author(s):  
Wang Xingxing ◽  
Ye Jihong ◽  
Wang Wei
Keyword(s):  
Numerical Model ◽  
Prediction Model ◽  
Bending Moment ◽  
Structural Performance ◽  
Nonlinear Behaviour ◽  
Column Joint ◽  
Cold Formed Steel ◽  
Loading Tests ◽  
Beam Section ◽  
Cyclic Loading Tests

A reinforced beam–column joint specific to mid-rise cold-formed steel (CFS) dwellings was proposed and studied by six full-scale cyclic loading tests. Afterwards, a moment–rotation relationship prediction model and a numerical model of the joint were established. The results show that: (i) the joint has a certain bending moment transmission capacity; (ii) the joint’s moment–rotation curve has distinctive three-stage deformation characteristics, including elastic, nonlinear, and failure stages successively; the structural performance of the joint is better and more in line with the requirements of mid-rise CFS dwellings than conventional joint; (iii) the elastic buckling strength of beam flange can be taken as the elastic limit of the joint, and the ultimate bending moment of the joint is determined by elastic flexural capacity of beam section; (iv) the prediction model and the numerical model can be used to establish an overall model of mid-rise CFS dwelling with consideration of joints’ nonlinear behaviour.

Experimental Study on Performance Evaluation of an Indonesian R/C Building Damaged by the 2009 Sumatra Earthquake

2011 ◽  
Vol 82 ◽  
pp. 380-385 ◽  
Author(s):  
Yasushi Sanada ◽  
Yoshiaki Nitta ◽  
Takuya Tomonaga ◽  
Yuta Sashima
Keyword(s):  
Seismic Performance ◽  
Field Investigation ◽  
Structural Performance ◽  
Sumatra Earthquake ◽  
Test Results ◽  
Joint Failure ◽  
Structural Details ◽  
West Sumatra ◽  
Column Joint ◽  
Design Calculations

The 2009 Sumatra, Indonesia earthquake attacked Padang, which is the capital of West Sumatra province, and damaged a large number of reinforced concrete (R/C) buildings. The first author of this paper had conducted a post-earthquake field investigation in Padang. As a result, it was found that one of typical damage to buildings was beam-column joint failure. This damage was caused by poor structural details at joints, nevertheless appropriate details were provided in the Indonesian design regulation. In this study, the structural performance of a typical beam-column joint was experimentally evaluated to investigate the seismic performance of earthquake-damaged buildings. The test results revealed that joint failure occurred prior to beam/column yielding. This means that the actual seismic performance of damaged buildings was less than the design calculations in which joint failure had not been assumed.

Experimental Study on CFRP-Bonded Steel Plates with Thickness Reduction Using Underwater Epoxy

2011 ◽  
Vol 117-119 ◽  
pp. 373-379
Author(s):  
Xiao Chen ◽  
Yasuo Kitane ◽  
Yoshito Itoh
Keyword(s):  
Epoxy Adhesive ◽  
Steel Plates ◽  
Fiber Reinforced Polymer ◽  
Structural Performance ◽  
Carbon Fiber Reinforced Polymer ◽  
Curing Process ◽  
Test Results ◽  
Initial Stiffness ◽  
Reinforced Polymer ◽  
Loading Tests

This paper presents a series of uniaxial loading tests on the thickness-reduced steel plates bonded with carbon fiber reinforced polymer (CFRP) strand sheets using underwater epoxy as adhesive. Four sets of material test are carried out on epoxy coupons at different curing times. Repaired performance of CFRP-bonded steel plates is investigated in terms of initial stiffness, yield strength, and failure mode of the specimens. Test results showed that the structural performance of CFRP-bonded steel plates does not reach the expected design level due to a slow curing process of epoxy adhesive in this study. The curing effects of epoxy adhesive on the repaired performance are discussed.

Failure Modes and Acceptance Criteria of Reinforced Prestressed Concrete Railway Sleepers Based on Dynamic Loading Tests

2015 ◽  
Vol 752-753 ◽  
pp. 522-527 ◽  
Author(s):  
Marcela Karmazínová
Keyword(s):  
Dynamic Loading ◽  
Prestressed Concrete ◽  
Crack Width ◽  
Failure Modes ◽  
Dynamic Behaviour ◽  
Test Results ◽  
Acceptance Criteria ◽  
Loading Tests ◽  
The Moment ◽  
Total Fracture

The paper is focused on the problems of the dynamic behaviour, failure and resistance of reinforced prestressed concrete railway sleepers, developed and verified continuously in the period of several last years. The results of dynamic loading tests are presented for the sleepers for both wide and narrow track gauge. The test results have been evaluated using the criteria for the acceptance based on the load corresponding to the prescribed crack width and the load at the moment of total fracture.

A Trilinear Model for M - θ Curves of Semi-Rigid End-Plate Connections

2013 ◽  
Vol 651 ◽  
pp. 143-147 ◽  
Author(s):  
Tao Wang ◽  
Zhan Wang ◽  
Jun Jie Feng
Keyword(s):  
Calculation Method ◽  
Ease Of Use ◽  
Actual Structure ◽  
End Plate ◽  
Trilinear Model ◽  
Rigid Connection ◽  
Plate Connections ◽  
The Moment ◽  
Simplified Calculation ◽  
Relationship Of

The moment behavior of beam-column connections should be considered in advanced steel space frame analysis. A trilinear model and calculation method were presented. Based on the comparison with the FEM results, it has been proved that the M-θ relationship of semi-rigid end-plate connections can be accurately estimated by this simplified calculation method and satisfy the requirement of structural design. This calculation method is simple and ease of use, it benefits application of this kind of joint in actual structure engineering and provides the basis and reference for design of the semi-rigid connection.

Simulation of Reinforced Concrete Frames with Nonductile Beam-Column Joints

2013 ◽  
Vol 29 (1) ◽  
pp. 233-257 ◽  
Author(s):  
Sangjoon Park ◽  
Khalid M. Mosalam
Keyword(s):  
Reinforced Concrete ◽  
Rc Buildings ◽  
Concrete Frames ◽  
Backbone Curve ◽  
Building Frames ◽  
Column Joint ◽  
Backbone Curves ◽  
The Moment ◽  
Nonlinear Dynamic Analyses ◽  
Relationship Of

The accurate prediction of shear strength and flexibility of beam-column joints without transverse reinforcement is essential to assess the seismic performance of nonductile reinforced concrete (RC) buildings characterized by having such unreinforced beam-column joints. In this study, a multilinear backbone curve to represent the moment-rotation relationship of an unreinforced corner beam-column joint is proposed. The modeling parameters of the backbone curve are estimated based on experimental results of four corner joint specimens recently tested by the authors. Furthermore, the proposed backbone curve is modified to be applicable to interior and roof beam-column joints. These backbone curves are validated by accurate reproduction of the force-drift responses of the four corner joint specimens and eight other exterior and interior joint specimens from literature. Using these backbone curves, nonlinear dynamic analyses are performed on three hypothetical building frames. The analytical results demonstrate the importance of joint flexibility for seismic assessment of nonductile RC buildings.

scholarly journals Experimental Study on the Flexural Behavior of an Innovative Modular Steel Building Connection with Installed Bolts in the Columns

2019 ◽  
Vol 9 (17) ◽  
pp. 3468 ◽  
Author(s):  
Yongrui Wang ◽  
Junwu Xia ◽  
Renwei Ma ◽  
Bo Xu ◽  
Tonglei Wang
Keyword(s):  
Bearing Capacity ◽  
Static Loading ◽  
Bending Moment ◽  
Flexural Behavior ◽  
Destruction Process ◽  
Load Bearing Capacity ◽  
Welding Seam ◽  
Steel Building ◽  
Loading Tests ◽  
The Moment

Modular buildings have the highest levels of precasting in the current building system. There are some defects in present modular connections, such as the difficulties of construction, the weakening of the bearing capacity of beams or columns, and damage to decorations. This paper presents an innovative modular connection with installed bolts in the columns. Two symmetrical monotonous static loading tests were conducted to explore the flexural behavior of the innovative connection. Meanwhile, the moment–rotation relations, destruction process, ultimate bearing capacity, stiffness classification and internal stress distribution were analyzed. The results showed that the specimen S1 with smaller diagonal stiffeners lost its bearing capacity due to the failure of the welding seam, and the extreme moment was 169 kN·m. The failure mode of S2 with large diagonal stiffeners was beam buckling, and the extreme moment was 209 kN·m. The stress of diagonal stiffeners and the join between the upper beam and stiffeners increased rapidly. Stiffeners can increase the stiffness and load-bearing capacity. The connection failures occurred on the beam or beam–column joints, while the connection between modules remained undamaged, which showed that the new connection has a good bearing capacity under the action of bending moment and pressure.

Effects of dowels on the mechanical properties of wooden composite beams in ancient timber structures

BioResources ◽  
2021 ◽  
Vol 16 (4) ◽  
pp. 6891-6909
Author(s):  
Xiaoli Han ◽  
Jian Dai ◽  
Wei Qian ◽  
Zhaoyang Zhu ◽  
Baolong Li
Keyword(s):  
Mechanical Properties ◽  
Composite Beam ◽  
Bending Moment ◽  
Composite Beams ◽  
Timber Structures ◽  
Test Results ◽  
Mechanical Behaviors ◽  
Bending Capacity ◽  
Loading Tests ◽  
Failure Conditions

In order to provide more accurate suggestions for the restoration of ancient timber buildings, five types of specimens were designed for static loading tests. The tree species used for the specimens was larch. The wooden composite beams were composed of purlins, tie plates, and fangs. The study analyzed the effects of the number and position of dowels on the mechanical behaviors of wooden composite beams in ancient timber buildings. The bending moment, slippage, strain of the wooden composite beams under the deflection of the beam allowed according to code, and the ultimate bearing capacity of the wooden column composite beams under failure conditions were examined. The test results showed that the dowels could improve the bending capacity of the wooden composite beams. The even distribution of the dowels was beneficial in reducing the sliding effect of the wooden composite beams. Under the amount of deflection allowed by the code, the mid-span section strain along the height of the wooden composite beam approximately conformed to the plane section assumption. The wooden composite beam still had bending capacity after each member failed. The results of this study illustrated that dowels improved the overall mechanical properties of the wooden composite beams.

scholarly journals Probabilistic Characteristics of Moment Capacity and Rotational Stiffness of Wedge Joints Used in Support Systems Reflecting Reused Members

2019 ◽  
Vol 9 (19) ◽  
pp. 4056 ◽  
Author(s):  
Jin Kyun Bong ◽  
Hyung Do Lee ◽  
Seungjun Kim ◽  
Ho-Seong Mha ◽  
Dong-Kyun Yim ◽  
...  
Keyword(s):  
Confidence Interval ◽  
Lower Limit ◽  
Support Systems ◽  
Rotational Stiffness ◽  
New Members ◽  
Moment Capacity ◽  
Upper Limit ◽  
Upper Limits ◽  
Trilinear Model ◽  
The Moment

The moment capacity and rotational stiffness of wedge joints, which connect vertical and horizontal members of assembled support systems, were evaluated experimentally considering the characteristics of reused members. Since temporary structures, such as supports, tend to be reused, experiments were conducted with reused members, and the normality of the measured data was assessed. The lower and upper limits of the 95% confidence intervals of the moment capacity and rotational stiffness of wedge joints with reused members were determined. Experiments were also conducted on a joint system with new members to analyze the influence of reused members. In integrating both new and reused members, the maximum moments of wedge joints were observed to be normally distributed. The lower limit of the 95% confidence interval of the maximum moment of joints was 0.997 kNm, and the upper limit was 1.074 kNm. The rotational stiffness of the wedge joint was evaluated using a trilinear model. The initial rotational stiffness decreased with continued use of the joint. The average rotational stiffness of the joint, analyzed by combining the results for new and reused members, was found to be 22.475 kNm/rad for the first interval, 4.705 kNm/rad for the second interval, and 1.577 kNm/rad for the third interval. The lower limit of the 95% confidence interval of the initial rotational stiffness was 20.688 kNm/rad, and the upper limit was 24.262 kNm/rad.

PRACTICAL SEISMIC STRENGTHENING OF R/C BEAM-COLUMN JOINTS WITHOUT LATERAL REINFORCEMENTS IN DEVELOPING COUNTRIES

2014 ◽  
Vol 1 (1) ◽  
Author(s):  
Yasushi Sanada ◽  
Yuebing Li
Keyword(s):  
Developing Countries ◽  
Seismic Strengthening ◽  
Structural Details ◽  
West Sumatra ◽  
Column Joint ◽  
Loading Tests ◽  
The Moment ◽  
Cyclic Loading Tests ◽  
Wing Walls ◽  
Strengthening Method

Several destructive earthquakes in developing countries in recent years have revealed that a large number of reinforced concrete (R/C) buildings contained no lateral reinforcements in beam-column joints. Severe damage was caused to such beam-column joints due to poor structural capacities, and resulted in complete/story collapse of buildings and loss of human lives. Considering the economic and technical conditions in developing countries, this paper proposes a practical seismic strengthening method for applying R/C wing walls to this kind of substandard beam-column joint. A feasible design concept is presented exemplifying an exterior beam-column joint, representing a typical earthquake-damaged joint by the 2009 West Sumatra, Indonesia earthquake. In this study, two 3/4-scale exterior beam-column joint specimens were constructed with the common structural details, and one of them was strengthened by R/C wing walls. Their seismic performance was evaluated through static cyclic loading tests. It was found that the strengthened specimen behaved a ductile manner with beam yielding, whereas the unstrengthened control specimen prematurely failed at the joint. The proposed strengthening method significantly increased the moment resistance of the joint. Fundamental experimental data could be successfully obtained to propose the calculation procedure for designing R/C wing walls for practical strengthening.

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