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RISShear Lag Analysis in Prestressed Concrete Box Girders
Publisher: American Society of Civil Engineers
Abstract: Most studies on shear lag effect in box girders are only concerned about concentrated loads and uniformly distributed loads. In this paper, a finite-element method based on the variational principle is presented to analyze ...
Finite Beam Element Considering Shear-Lag Effect in Box Girder
Publisher: American Society of Civil Engineers
Abstract: A finite-element method considering the interaction of the bending and shear-lag deformation of a box girder was established. Meanwhile a shear-lag-induced stiffness matrix was defined. The stiffness matrices considering ...
A Sequential Algorithm for Possibility-Based Design Optimization
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: Deterministic optimal designs that are obtained without taking into account uncertainty/variation are usually unreliable. Although reliability-based design optimization accounts for variation, it ...
A Design Optimization Method Using Evidence Theory
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: Early in the engineering design cycle, it is difficult to quantify product reliability or compliance to performance targets due to insufficient data or information to model uncertainties. Probability ...
Analysis of Effect of Dead Loads on Natural Frequencies of Beams Using Finite-Element Techniques
Publisher: American Society of Civil Engineers
Abstract: In this paper, a conception of load-induced stiffness matrix is developed, and a beam element for using the finite-element method, which takes into consideration the stiffening effect of dead loads, is proposed. The element ...
Optimal Layout Design of a Satellite Module Using a Coevolutionary Method with Heuristic Rules
Publisher: American Society of Civil Engineers
Abstract: The layout design of a satellite module belongs to a three-dimensional (3D) packing problem with mutual-conflicting performance constraints. Taking the layout design of a simplified commercial communication satellite as a ...
Optimal Design of Star-Tree Oil-Gas Pipeline Network in Discrete Space
Publisher: American Society of Civil Engineers
Abstract: Construction of oil-and-gas pipeline networks is an important topic in the field of oil and gas development. The rationality and economy of pipeline-network construction are becoming increasingly important. Generally, the ...
Disturbance Observer–Based Nonlinear Model Predictive Control for Air-Breathing Hypersonic Vehicles
Publisher: American Society of Civil Engineers
Abstract: The disturbance-observer-based nonlinear model predictive control (DOB-NMPC) for air-breathing hypersonic vehicles (AHVs) is proposed in this paper. The longitudinal dynamic model of generic AHVs is first redesigned and ...
Operation Optimization of Multiroute Cyclic Natural Gas Transmission Network under Different Objectives
Publisher: ASCE
Abstract: Natural gas transmission networks (NGTNs) are the main facility connecting upstream gas sources and downstream consumers. For a cyclic NGTN with multiple gas transmission routes, different gas transportation schemes will ...