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RISPractical Tuning Rule Development for Fractional Order Proportional and Integral Controllers
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: This paper presents a new practical tuning method for fractional order proportional and integral (FO-PI) controller. The plant to be controlled is mainly first order plus delay time (FOPDT). ...
Fractional Order Filter Enhanced LQR for Seismic Protection of Civil Structures
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: This study presents fractional order filters to enhance the performance of the conventional linear quadratic regulator (LQR) method for optimal robust control of a simple civil structure. The ...
Slip-Line Solution to Earth Pressure of Narrow Backfill against Retaining Walls on Yielding Foundations
Publisher: ASCE
Abstract: When a retaining wall is adjacent to a natural slope, the overturning of the wall is usually caused by a yielding foundation. At the point of overturning, the narrow backfill behind the wall has reached the active limit ...
Active Earth Pressure against Cantilever Retaining Walls with the Long Relief Shelf Rotating about the Bottom
Publisher: ASCE
Abstract: A cantilever retaining wall incorporating a long relief shelf is a specific form of retaining wall. However, currently, there are no reports investigating this retaining wall rotating about the bottom. Herein, the failure ...
Slip Line Solution for Active Earth Pressure of Retaining Walls with Relief Shelves Subjected to Base Rotation
Publisher: ASCE
Abstract: At present, the research on retaining walls with relief shelves mainly focuses on translational displacement mode, and the research on RB mode is less. Using adaptive software, it is possible to obtain the grid distribution ...
Failure Mechanism and Active Earth Pressure of Narrow Backfills behind Retaining Structures Rotating about the Base
Publisher: ASCE
Abstract: A series of model tests were conducted to simulate the active failure of narrow cohesionless backfills behind retaining walls rotating about the base (RB mode). The tests aimed to investigate the effect of wall displacement ...
Active Earth Pressure on the Rigid Support Structures of Excavations Parallel to Tunnel Construction
Publisher: American Society of Civil Engineers
Abstract: The failure mode of the soil behind the rigid support structure of excavations parallel to tunneling was simulated using the adaptive finite-element limit analysis method. This study showed the effects of tunnel diameter, ...
Slip-Line Analysis of Passive Limit Support Pressure for Shallow-Buried Shield Tunnel Face
Publisher: American Society of Civil Engineers
Abstract: In view of the face stability of a shallow-buried shield tunnel excavation, this paper investigates the problem using an adaptive finite-element limit analysis combined with slip-line theory. First, a series of adaptive ...
Elastoplastic Solutions for Surrounding Rock Masses of Deep-Buried Circular Tunnels with Non-Darcian Flow
Publisher: American Society of Civil Engineers
Abstract: The significant characteristics of the non-Darcian flow of groundwater seepage in a low-permeability rock mass have been reported, but there have been few studies on the analytical solutions for deep-buried circular tunnels ...
Active Earth Pressure against Inverted T-Type Retaining Walls under Translation Mode
Publisher: ASCE
Abstract: Inverted T-type retaining walls are widely used in civil engineering. Classic earth pressure theories cannot accurately predict the failure mechanism of soils behind inverted T-type retaining walls. Under wall translation ...