scholarly journals Control Parametric Analysis on Improving Park Restoring Force Model and Damage Evaluation of High-Strength Structure

2016 ◽  
Vol 2016 ◽  
pp. 1-10
Author(s):  
Huang-bin Lin ◽  
Shou-gao Tang ◽  
Cheng Lan
Keyword(s):  
Mathematical Model ◽  
Numerical Models ◽  
High Strength ◽  
Strength Degradation ◽  
Structural Behavior ◽  
Force Model ◽  
Control Parameters ◽  
Restoring Force ◽  
Restoring Force Model ◽  
Testing Data

In the dynamic time-history analysis of structural elastoplasticity, it is important to develop a universal mathematical model that can describe the force-displacement characteristics for restoring force. By defining three control parameters (stiffness degradation, slip closureγ, energy degradationβ), the Park restoring force mathematical model can simulate various components. In this study, the Park restoring force has been improved by adding two control parameters (energy-based strength degradationβeand ductility-based strength degradationβd). Based on the testing data, the constitutive model is input and 55 numerical models are developed to analyze the effects of various parameters on structural behavior.Conclusion. (1)βhas determinative effect on structural behavior; the effect ofβeis basically consistent with that ofβ;αhas significant effect on shear forces and bending moments;γhas significant effect on displacements and accelerations;βdhas significant effect on shearing forces, acceleration, and total energy consumptions. (2) Based on the classification of four types of damage level, the recommended values forα,γ,β,βe, andβdare presented. (3) Based on the testing data of high-strength columns, the recommended values for the five control parameters of the improved Park restoring force model are presented.

Experimental study on seismic behaviors of beam with concrete-encased steel truss

2018 ◽  
Vol 21 (13) ◽  
pp. 2018-2029
Author(s):  
Xide Zhang ◽  
Zhiheng Deng ◽  
Xiaofang Deng ◽  
Jingwei Ying ◽  
Tao Yang ◽  
...  
Keyword(s):  
High Strength ◽  
Force Model ◽  
Restoring Force ◽  
Restoring Force Model ◽  
Steel Truss ◽  
Different Types ◽  
Energy Dissipation Capacity ◽  
Load Displacement ◽  
Strength And Stiffness ◽  
Seismic Behaviors

To evaluate the ductility and energy dissipation capacity of the beam with concrete-encased steel truss, eight specimens with different types of steel truss, reinforcement ratios, and shear span ratios were tested by low-cyclic loading regime. The results indicated that beams with concrete-encased steel truss performed plumped load–displacement hysteretic loops as well as high strength and stiffness. Moreover, cross-web members improved their seismic behavior more effectively than non-cross-web members. Finally, the restoring force model of concrete-encased steel truss beam is proposed in accordance with the experimental results, which can be used to predict the load–displacement behavior of concrete-encased steel truss beam. The results could also provide a reference for the design and application of concrete-encased steel truss beam in practice.

A Hysteresis Restoring Force Model of Disc-Shaped Metal Rubber Isolation Component

2012 ◽  
Vol 271-272 ◽  
pp. 186-189 ◽  
Author(s):  
Feng Li Cao ◽  
Hong Bai Bai ◽  
Zhong Bo He ◽  
Guo Quan Ren
Keyword(s):  
Experimental Data ◽  
Mathematical Model ◽  
Experimental Verification ◽  
Vibration Isolation ◽  
Practical Significance ◽  
Force Model ◽  
Stiffness Coefficient ◽  
Restoring Force ◽  
Restoring Force Model ◽  
Metal Rubber

Dynamic load experiments of the disc-shaped metal rubber isolation component are performed. Through analyzing variation law of the parameters with amplitude and frequency, which are stiffness coefficient, damping coefficient and damping component factor, the hysteresis restoring force model which is able to fully reveal the dynamic characteristics of the component is established. The experimental verification results show that the theoretic calculations are consistent with the experimental data, which verifies the practicability and effectiveness of mathematical model and parameter identification. It has important practical significance for design of vibration isolation component with different requirements.

Restoring Force Models Investigation of Research Status and Problems Analysis of RC Structure

2013 ◽  
Vol 275-277 ◽  
pp. 1045-1048
Author(s):  
Pin Le Zhang
Keyword(s):  
Mathematical Model ◽  
Nonlinear Analysis ◽  
Force Model ◽  
Restoring Force ◽  
Research Status ◽  
Deformation Curves ◽  
Restoring Force Model ◽  
Rc Structure ◽  
Dynamic Nonlinear Analysis ◽  
Simplified Mathematical Model

Restoring force model is a simplified mathematical model derived from restoring force-deformation curves in lots of tests. Selecting a reasonable restoring force model is the basis of conducting dynamic nonlinear analysis of structure. The work further investigates the advantage and disadvantage of the restoring force models presented in this paper. Classified and brief comments about the existing drawbacks of restoring force models and its application are conducted. Lastly, some useful suggestions are proposed for the further research.

Research on Restoring Force Model of High Strength Concrete-Filled Steel Tubular Columns

2012 ◽  
Vol 166-169 ◽  
pp. 1746-1751
Author(s):  
Kai Ze Ma
Keyword(s):  
High Strength Concrete ◽  
Axial Load ◽  
Slenderness Ratio ◽  
Load Ratio ◽  
High Strength ◽  
Experimental Results ◽  
Force Model ◽  
Restoring Force ◽  
Restoring Force Model ◽  
Axial Load Ratio

Based on the experimental results of twenty three high strength concrete-filled square steel tubular (HCFT) columns subjected to cyclic lateral load, the restoring force model of square HCFT columns is established. Through theoretical analysis and experimental results, the main parameters of the restoring force model which are axial load ratio, confinement effect coefficient as well as slenderness ratio are discussed. The theoretical method is put forward. The results show that the relation of elastic stiffness to degraded stiffness, the relation of ultimate bearing capacity to yielding loads are proportional with confinement effect coefficient, and inversely with axial load ratio as well as slenderness ratio. Many various influential factors are considered in the restoring force model of square HCFT columns. The model is close to the experimental results which can be conveniently applied for nonlinear dynamics analysis of composite structures.

scholarly journals Restoring Force Model For A New Type of Bolted Prefabricated Beam-To-Column Joint

2021 ◽  
Author(s):  
Jiang Haotian ◽  
Miao Hailin ◽  
Jin Chenhua ◽  
LI Qingning ◽  
Yan Lei
Keyword(s):  
High Strength ◽  
Steel Plates ◽  
Hysteresis Curve ◽  
Force Model ◽  
Backbone Curve ◽  
Restoring Force ◽  
Panel Zone ◽  
Restoring Force Model ◽  
New Type ◽  
Column Joint

Abstract The wet prefabricated beam-to-column joint (PBCJ) has a densely reinforced panel zone and is difficult to construct, leading to poor connection reliability. To address this problem, we propose a dry PBCJ, where the concrete column is encased with steel plates at the connection and the beams and the column are connected by high-strength bolts. The method for constructing the joint is described herein. A total of six full-scale PBCJs were designed and subjected to quasi-static loading tests with different stirrup ratios, reinforcement strengths, and joint strengthening methods. Based on the test loading process, the joint failure mode is summarised, and a trilinear backbone curve model is proposed. According to the characteristics of the hysteresis curve and the backbone curve, the stiffness degradation law and hysteresis rule are analysed; then, the restoring force model for the new type of PBCJ is established, and the model results are compared with the test results. The data show that the new bolted PBCJ undergoes the cracking, yielding, ultimate, and failure stages; the trilinear backbone curve, which is composed of an elastic section, an elastoplastic section, and a plastic section, well describes the load-carrying characteristics of the joint. The backbone curve calculated by the established restoring force model is consistent with that obtained from the tests, indicating that the model can accurately describe the energy dissipation performance of the new PBCJ and thus provide a theoretical basis for the seismic performance analysis of this type of joint.

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