scholarly journals Assessing Seismic Performance of Gantry Crane Subjected to Near-Field Ground Motions Using Incremental Dynamic and Endurance Time Analysis Methods

2022 ◽  
Vol 2022 ◽  
pp. 1-14
Author(s):  
Qihui Peng ◽  
Wen-ming Cheng ◽  
Peng Guo ◽  
Hongyu Jia
Keyword(s):  
Seismic Performance ◽  
Incident Angle ◽  
Ground Motions ◽  
Near Field ◽  
Maxwell Model ◽  
Element Model ◽  
Gantry Crane ◽  
Time Analysis ◽  
Viscous Dampers ◽  
Endurance Time

Assessing the seismic performance of the gantry crane is significant since the structure is more vulnerable to earthquakes with the increase in size and lifting weight capacity. This paper aims to investigate the seismic response of the gantry crane incorporating near-field ground motions using incremental dynamic and endurance time analysis (IDA and ETA) methods. To model the structure accurately, a nonlinear finite element model of the gantry crane considering the viscoelastic effect is developed in the OpenSees platform. Then, the IDA method is also carried out for a comparison with the ETA method. The results of the two methods are consistent with a correlation of 93.9% while the computational demand of the ETA method is much less than those of the IDA method. To study further, both the seismic incident angle and the application of viscous dampers using the Maxwell model are analyzed and discussed in detail. The results show that seismic incident angle has a distinct influence on the maximum seismic displacement and viscous dampers can significantly reduce the seismic demand of the gantry crane. These findings support the seismic design of gantry cranes and evaluate the structural seismic performance efficiently.

scholarly journals Seismic analysis of uplift-available gantry crane subjected to extreme earthquake loads

2021 ◽  
Vol 37 (3) ◽  
Author(s):  
Q. Peng
Keyword(s):  
Seismic Analysis ◽  
Incident Angle ◽  
Ground Motions ◽  
Near Field ◽  
Time History ◽  
Gantry Crane ◽  
Inelastic Behavior ◽  
Variable Model ◽  
Highly Nonlinear ◽  
Inelastic Responses

This paper aims to investigate the uplift behavior coupled with the non-linearity both in material properties and in geometry deformations of a typical gantry crane under near-field ground motions. First, the highly nonlinear and time variable model considering the uplift-available boundary condition based on the theory of Mohr-Coulomb friction is established of the gantry crane using the OpenSees platform. Then, a series of time-history analyses on this model structure is performed under three near-field seismic loadings with different exceeding probabilities. Furthermore, the comparison between the uplift-available gantry crane and the fixed crane is also carried out to provide in-depth insight into the structural responses under different boundary conditions. Finally, coupling with the material and geometry inelastic behavior, the uplift response process is modeled in this paper and the seismic incident angle from 0 up to 360 degrees is also examined to quantitatively confirm the prioritization of uplift event and the other inelastic responses. And the new conception of uplift probability is first proposed herein to reveal the nature of uncertainty. It is found that uplift behavior plays an essential role in designing and evaluating the seismic performance of gantry cranes; further, the uplift response increases the seismic demand of the gantry crane structure and even causes collapse under strong ground motions.

Shake Table Studies on Viscous Dampers in Seismic Control of a Single-Tower Cable-Stayed Bridge Model under Near-Field Ground Motions

2018 ◽  
Vol 12 (05) ◽  
pp. 1850011 ◽  
Author(s):  
Jiang Yi ◽  
Jianzhong Li ◽  
Zhongguo Guan
Keyword(s):  
Ground Motions ◽  
Near Field ◽  
Far Field ◽  
Viscous Damper ◽  
Viscous Dampers ◽  
Damping Force ◽  
Seismic Control ◽  
Cable Stayed Bridge ◽  
Bridge Model ◽  
Cable Stayed Bridges

To investigate the effectiveness of viscous damper on seismic control of single-tower cable-stayed bridges subjected to near-field ground motions, a 1/20-scale full cable-stayed bridge model was designed, constructed and tested on shake tables. A typical far-field ground motion and a near-field one were used to excite the bridge model from low to high intensity. The seismic responses of the bridge model with and without viscous dampers were analyzed and compared. Both numerical and test results revealed that viscous dampers are quite effective in controlling deck displacement of cable-stayed bridges subjected to near-field ground motions. However, due to near-field effects, viscous damper dissipated most energy through one large hysteresis loop, extensively increasing the deformation and damping force demand of the damper. Further study based on numerical analysis reveals that to optimize deck displacement of cable-stayed bridges during an earthquake, a viscous damper with relatively larger damping coefficient should be introduced under near-field ground motions than far-field ones.

scholarly journals Nonlinear Seismic Performance Evaluation of Flexural Slotted Connection Using Endurance Time Method

2020 ◽  
Vol 2020 ◽  
pp. 1-15
Author(s):  
Seyed Mohamad Seyed Kolbadi ◽  
Hosein Piri ◽  
Ali Keyhani ◽  
S.Mahdi Seyed-Kolbadi ◽  
Masoud Mirtaheri
Keyword(s):  
Seismic Performance ◽  
Computational Cost ◽  
Structural Response ◽  
Time History ◽  
Steel Structure ◽  
Response Spectra ◽  
Structure Design ◽  
Time Analysis ◽  
Endurance Time ◽  
Seismic Performance Evaluation

The equivalent statistical methods, spectral analysis, and time history analysis are usually offered in the steel structure design regulations. Among these methods, the third one is more accurate; however, it requires more time to align the accelerometers due to a large number of analyses. In the endurance time (ET) method, incremental acceleration functions gradually and uniformly increases over time while their linear and nonlinear response spectra are proportional to the mean of the real seismic spectrum. These functions are used as input functions to analyze the nonlinear time history of structures, and the performance of structures is evaluated based on the maximum length of time they can meet specified performance goals. A three-story steel bending frame with (slotted web) SW and (web unslotted flange) WUF connection is examined through the performance time method in performance-based design. This article aimed at evaluating the seismic performance of these connections in the bending frame through endurance time analysis to predict the structural response in the probabilistic evaluation of the seismic performance of the structures. It is found that the endurance time analysis is justified with the seismic performance of the connections with low computational cost and proper accuracy. The results of comparing both SW and WUF connections indicated that the SW connection prevents the connection welding area from being failed due to transferring the plastic joint into the beam and in an area away from the column face and causes less damage compared to the WUF connection.

scholarly journals Fragility Analysis of Gantry Crane Subjected to Near-Field Ground Motions

2020 ◽  
Vol 10 (12) ◽  
pp. 4219
Author(s):  
Qihui Peng ◽  
Wenming Cheng ◽  
Hongyu Jia ◽  
Peng Guo
Keyword(s):  
Failure Probability ◽  
Structural Damage ◽  
Fragility Curves ◽  
Damage Control ◽  
Ground Motions ◽  
Near Field ◽  
Vertical Component ◽  
Gantry Crane ◽  
Fe Model ◽  
Demand Model

A gantry crane located in a near-field earthquake-prone area is selected in this paper as an example, and the nonlinear finite element (FE) model is used considering the material nonlinearity including plastic hinges and the second order (P − Δ ) effect with a comprehensive consideration of the components including sill beams, support beams, legs, and trolley girders. The local displacement ratio (LDR) and deflection ratio (DR) are proposed as demand measures (DMs) of the gantry crane, which are utilized to construct a probabilistic seismic demand model (PSDM). Then, the capacity limit states for the gantry crane are defined in this study by performing pushover analysis (POA), known as serviceability, damage control, and collapse prevention, respectively. Moreover, the operating capacity of the crane during an earthquake is further investigated and quantified by operating seismic peak ground acceleration, which is defined as the maximum acceleration when the failure probability is 50%. Finally, the fragility curves and the failure probability of the gantry crane are derived by the above definitions, all of which are pioneering in the seismic design of gantry cranes subjected to near-field ground motions. Some major conclusions are drawn that the horizontal component of an earthquake has a more notable effect on the structural damage of the gantry crane compared to the vertical component, and incremental dynamic analysis can take seismic uncertainty into account and quantify the deformation of gantry crane in more detail.

Development of Optimal Viscous Dampers for RC Structures in Near Field Ground Motions

2008 ◽  
Author(s):  
Arun M. Puthanpurayil ◽  
Paul Reynolds ◽  
Adolfo Santini ◽  
Nicola Moraci
Keyword(s):  
Ground Motions ◽  
Near Field ◽  
Viscous Dampers ◽  
Rc Structures

Probabilistic Seismic Performance of Rocking-Foundation and Hinging-Column Bridges

2012 ◽  
Vol 28 (4) ◽  
pp. 1423-1446 ◽  
Author(s):  
Lijun Deng ◽  
Bruce L. Kutter ◽  
Sashi K. Kunnath
Keyword(s):  
Finite Element ◽  
Seismic Performance ◽  
Parametric Study ◽  
Ground Motions ◽  
Element Model ◽  
Incremental Dynamic Analysis ◽  
Base Shear ◽  
Fixed Base ◽  
Rocking Foundation ◽  
Rocking Foundations

Many engineers are hesitant to specify rocking foundations for ordinary bridges because of the unsubstantiated notion that rocking bridges are more susceptible to instability than conventional fixed-base bridges. A parametric study using a finite element model including large deformation effects compares the performance and stability of stiff, flexible, tall, and short hinging-column and rocking-foundation systems. Eighty different ground motions, scaled using incremental dynamic analysis, were considered. Results show that, in a probabilistic sense, bridges with rocking foundations are more stable than bridges with hinging columns if their fundamental periods are the same and if base shear coefficients to initiate hinging or rocking mechanisms are the same. Maximum drifts are not much affected by changing between rocking and hinging mechanisms except near collapse, but residual drifts are smaller for rocking systems. The results also challenge the notion that rocking systems require a different design approach than hinging column systems.

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