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Gang J.,University of Sichuan | Gang J.,Sichuan Institute of Building Research | Tu Y.,University of Sichuan | Tu Y.,Drexel University | And 4 more authors.
Computers and Operations Research | Year: 2015

This paper focuses on a stone industrial park location problem with a hierarchical structure consisting of a local government and several stone enterprises under a random environment. In contrast to previous studies, conflicts between the local authority and the stone enterprises are considered. The local government, being the leader in the hierarchy, aims to minimize both total pollution emissions and total development and operating costs. The stone enterprises, as the followers in the hierarchy, only aim to minimize total costs. In addition, unit production cost and unit transportation cost are considered random variables. This complicated multi-objective bi-level optimization problem poses several challenges, including randomness, two-level decision making, conflicting objectives, and difficulty in searching for the optimal solutions. Various approaches are employed to tackle these challenges. In order to make the model trackable, expected value operator is used to deal with the random variables in the objective functions and a chance constraint-checking method is employed to deal with such variables in the constraints. The problem is solved using a bi-level interactive method based on a satisfactory solution and Adaptive Chaotic Particle Swarm Optimization (ACPSO). Finally, a case study is conducted to demonstrate the practicality and efficiency of the proposed model and solution algorithm. The performance of the proposed bi-level model and ACPSO algorithm was highlighted by comparing to a single-level model and basic PSO and GA algorithms. © 2014 Elsevier Ltd. All rights reserved. Source

Tian L.,Shandong University | Ma R.,Shandong University | Wang W.,Dalian University of Technology | Wang L.,Sichuan Institute of Building Research
Open Civil Engineering Journal | Year: 2013

Collapses of power transmission towers had usually taken place in previous large earthquake. The collapse process of a power transmission tower under earthquake excitation is studied in this paper. Using international finite element software ABAQUS, the three-dimensional finite element model of the power transmission tower is created based on a practical engineering. Three typical seismic records are selected. The progress collapse processes of the power transmission tower under different seismic excitations are simulated using the nonlinear time history method. The collapse paths and failure positions of the power transmission tower are obtained under different seismic excitations. The results can provide reference for seismic design of power transmission tower which can prevent the collapse of the power transmission tower. © Tian et al. Source

Gao J.,Southwest Jiaotong University | Wang Z.,Southwest Jiaotong University | Pan Y.,Southwest Jiaotong University | Ge Q.,Sichuan Institute of Building Research
Tumu Jianzhu yu Huanjing Gongcheng/Journal of Civil, Architectural and Environmental Engineering | Year: 2016

Strong earthquake has adverse impact on the petrochemical steel structures of refinery and lead to large economic losses and serious secondary disasters. We studied a reformer reactor of a large refinery, built the finite element model and set viscous dampers to reduce the seismic risk of petrochemical structures based on their characteristics. Then we analyzed the influence factors, including location, quantity and the damping parameters of the viscous dampers. The results show that the inter-story force and inter-story displacement angle of the floor where the viscous damper was setted decrease significantly, and the damping effect with setting viscous damper in the bottom is greater than that in the middle and upper part. Besides, the inter-story force and inter-story displacement angle decrease when the number of viscous damper increases, but the decrease amplitude reduces gradually. In addition, the influence of damping coefficient on the damping effect of the petrochemical steel structure is greater than that of the damping index. So the damping coefficient should be given priority to consider in the structure design for better seismic performance. © 2016, China National Publications Import and Export (Group) Corporation. All right reserved. Source

Qin S.,Chongqing University | He D.,Chongqing University | Chen P.,Chongqing University | Zhang P.,Sichuan Institute of Building Research
Tumu Jianzhu yu Huanjing Gongcheng/Journal of Civil, Architectural and Environmental Engineering | Year: 2016

Based on the present situation of masonry structure and the development of housing industrialization, We proposed an invonative unbonded post-tensioned precast concrete composite wall to develop a new structure form in the low-rise civil construction. We studied two specimens with various levels of pre-stressing were studied experimentally by the quasi-static test system to investigate the seismic behavior of the composite wall and obtained the seismic behavior indexes of corresponding specimens. The results show that the walls have better bearing capacity and good ductility. They could meet the application requirements of the low-rise building in eight-intensity area and be used as an alternative of masonry load-bearing wall structure. We also presented some suggestions about the structure forms of the compostie wall. © 2016, China National Publications Import and Export (Group) Corporation. All right reserved. Source

Zhang J.-Y.,Shanghai JiaoTong University | Zhang J.-Y.,Sichuan Institute of Building Research | Chen L.-Z.,Shanghai JiaoTong University | Zhu J.,University of Nebraska at Omaha
Soil Dynamics and Earthquake Engineering | Year: 2016

This paper presents theoretical analysis of the parallel seismic (PS) method for evaluating existing piles using the flexural mode wave exited by a horizontal impact on the lateral surface of a pile. A simplified theoretical model of the flexural wave for PS method was established to elaborate the theoretical basis. A correction factor was then obtained and proposed to correct the pile depth obtained from the PS method, thus providing a more accurate estimation. A three dimension (3-D) finite element (FE) model was developed and the existence of the flexural waves on branch F(1, 1) in the pile shaft has been verified. Two time domain methods were used to calculate the flexural wave velocity in the pile. One was based on the pile tip reflection signal using a model where pile head reflection was minimized, and another method used the slope of the upper fitted line in the PS test. The flexural wave velocities from both methods match well with the predicted flexural wave group velocity determined from the dispersion curve of a 1-rod embedded in the soil. The accuracy in estimation of pile tip depth is improved by applying the correction factor. A series of parametric studies were carried out to demonstrate the effectiveness of using flexural wave for PS test and the correction factor proposed in this study. © 2016 Elsevier Ltd. Source

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