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About 10,000 papers for “Structural Response to Dynamic Loads”
George Herrmann · 1989
Abstract : This report summarized the research activities carried out under the subject grant during the period 1 April 1974 to 31 March 1975. Subjects discussed are fracture mechanics, composite materials, shock waves, fluid-solid interaction, and dynamic stability.
Cited by 0
Hong Hao · International Journal of Protective Structures · 2015
Owing to the increased terrorist bombing attacks, as well as accidental explosions associated with the rapid economic development and urbanization, more and more civilian structures might experience blast loadings in their service lives. These increase the demands of more structures being designed to resist certain level of blast loadings. As a result, some structural engineers with limited or no experience or training on structural dynamics nowadays might need to deal with analysis and design of structures against high-rate blast loads. Although design guides are followed, lack of fundamental knowledge of structural performance under high-rate loadings might not necessarily lead to accurate structural response predictions because the design guides normally only cover the most general and common blast loading scenarios and structural response conditions. Similarly, some researchers who have abundant experiences in analysis and design of structures under relatively low-rate dynamic loadings such as earthquake ground excitations intend to directly apply their experiences in earthquake engineering to blast resistant designs. This sometimes leads to inappropriate actions, e.g., adapting inter-storey drift as a performance criterion, using active control devices or cross bracing as a blast loading mitigation measure. This paper discusses the fundamental theory of structural dynamics, basic differences of structural responses subjected to low-rate dynamic and high-rate blast loadings. The accuracy of commonly used approaches in structural response analysis to blast loadings, i.e., the Single-Degree-of-Freedom analysis, will also be discussed.
Cited by 71Open access
Waheed Uddin, Sergio Garza · 2010
This paper presents the results of a comprehensive simulation study that investigated the effects of infinite elements in pavement models, eigenvalue analysis, and damping. The results provide useful insight into pavement structural responses. This is not possible from traditional static linear elastic analysis and two dimensional-finite element models developed for pavement analysis and design. A three dimensional finite element half model of an asphalt highway pavement-subgrade system was created with optimum size and boundary conditions. The model was used for simulations of the load-time history of a falling weight deflectometer impact test. The half model was validated by the results of the Green's function and showed the limitation of the use of infinite elements for pavement models. The fundamental natural frequency of 8 Hz for the an asphalt highway pavement was determined by the eigenvalue analysis using the implicit finite element code. The results of a parametric study are presented to evaluate the effects of both system damping and Rayleigh damping on pavement deflection response and backcalculated modulus values.
Cited by 17
Amanda Borges Oliveira, Patrícia Diniz, Gilvan Lunz Debona et al. · International Journal of Civil Engineering · 2026
This research work aims to investigate the dynamic structural behaviour of pedestrian footbridges, when subjected to dynamic vandal loadings, based on the development of experimental tests and numerical modelling. The investigated footbridge is associated to a simply supported concrete structure with span of 24.4 m, currently used for pedestrian crossing, and located at the Faculty of Engineering (FEN) of the Rio de Janeiro State University (UERJ). Having in mind the strategic location of the footbridge, near the FEN/UERJ Director’s office, different loading scenarios were idealized to carry out experimental forced vibration tests on the structure, with the participation of up to 20 people, aiming to simulate dynamic vandal loads. Initially, an experimental modal analysis was performed on the investigated footbridge, in order to identify and assess the global dynamic behaviour of the system. In sequence, a finite element model was developed and calibrated through experimental results. After that, based on the forced vibration experimental tests the footbridge dynamic response was assessed. According to the results of this investigation, for the cases of 15 and 20 people exciting the footbridge (vandal loads), the peak accelerations are, respectively, 1.30 m/s² and 1.60 m/s², and excessive vibrations and human discomfort can occur. Finally, it must emphasised that the analysed footbridge should only be used to human walking.
Cited by 0Open access
Yuheng Liu, Kun Zhao, Zhikai Wang et al. · Thin-Walled Structures · 2026
Cited by 0
Xin Fang, Heng Li, Sherong Zhang et al. · Defence Technology · 2022
Cited by 20Open access
G. R. Abrahamson, A. L. Florence, J. N. Goodier et al. · Defense Technical Information Center (DTIC) · 1968
Structural response of reentry-vehicle-type structures to suddenly applied surface loads, body loads, and combined surface and body loads is investigated. Volume I contains a review of simulation requirements and methods for structural response, theoretical and experimental structural response investigations for body loads and combined surface and body loads, and a method for ABM warhead selection for observable structural kill. Volume II contains five structural response investigations involving dynamic buckling of rings, plates, and cylindrical shells under surface loads. (Author)
Cited by 0
Paul Augustine · UWM Digital Commons (University of Wisconsin–Milwaukee) · 2015
A structure in service can be subjected to static, dynamic or moving loads. Several situations in practice involve estimation of moving loads which induce vibrations in the structure on which they are applied. An accurate estimation of these loads will ensure product quality and reliability of the final design, and mitigate the cost of structural health monitoring systems. The moving nature of dynamic loads increases the computational difficulty of the problem. One of the types of Inverse Problems involves estimation of the applied load from measured structural response such as strain or accelerations.\nMeasuring response at a limited number of locations causes unavailability of the full structural response, which can lead to inaccurate results. The unavailability of full structural response is mainly due to three reasons - (i) financial constraints limiting the number of sensors that can be used, (ii) inaccessibility of loading locations to place sensors, and (iii) sensor influence on structural response. The load recovered from limited structural response data will be prone to errors. Ill-conditioning of the inverse problem can be eliminated by choosing optimum sensor locations on the structure, which leads to precise load estimates. No studies could be found which consider optimum sensor placement while recovering dynamic moving loads acting on a structure.\nIn this thesis, the recovery of the dynamic moving loads through measurement of structural response at a finite number of optimally selected locations is investigated. Optimum sensor locations are identified using the D-optimal design algorithm. Separate algorithms are developed for dynamic moving load recovery using strain measurements and acceleration measurements. The developed algorithms are successfully implemented using ANSYS APDL and MATLAB programming environment. Compared to conventional algorithms for estimating moving loads, the developed methods make the dynamic moving load recovery procedure accurate and relatively easy to implement.
Cited by 1Open access
J. W. Kim, Ki-Hoon Kim · 2007
Sloshing model test and dynamic structural analysis of a membrane-type LNG tank is performed to determine design sloshing loads for LNG containment system. Spatial, temporal and statistical characteristics of the measured sloshing loads are investigated. Dynamic structural analysis of a LNG containment system is performed to obtain structural responses at predefined critical locations under short duration triangular pulse, which is referred to as triangular impulse response function (TIRF). The TIRFs are synthesized with time history of measured sloshing loads to obtain dynamic response of the LNG containment system. Statistical analysis of peak stress values are used as basis of determining design sloshing loads for the structural assessment of LNG containment system.
Cited by 9
Zhongyuan Ma, Zhiyong Pei, Chunfeng Zhou · Applied Ocean Research · 2026
• Dynamic stability of the rectangular plate is investigated, and plastic accumulation after instability is analyzed using the NFEM. • Elastoplastic dynamic response under slamming loads is simulated, with structural failure modes captured through numerical simulations. • Dynamic collapse under periodic and slamming loads is assessed, incorporating structural failure analysis to preliminarily explore the coupled load effects. Ships experience time-varying dynamic loads during navigation, including periodic wave load and slamming load. This study investigates the dynamic collapse behavior of a typical ship plate through theoretical and numerical analyses. Dynamic instability loads of the rectangular plate are calculated based on dynamic stability theory, while the slamming response is analyzed using elastic plate dynamic equations, focusing on damping and static load effects. Additionally, the structural elastoplastic dynamic response is simulated using nonlinear finite element method, identifying structural collapse modes under critical slamming load and exploring the influences of slamming duration and periodic loading. Results indicate that periodic loading significantly reduces the critical slamming load, where dynamic instability induces plastic accumulation in the structure, leading to a rapid reduction in its slamming load-bearing capacity. This study provides guidance for analyzing the dynamic response and ultimate strength of hull structures under dynamic wave conditions.
Cited by 0Open access
K. J. Park, Jong-Nam Lee, G. J. Park · International Journal for Numerical Methods in Engineering · 2005
In structural optimization, static loads are generally utilized although real external forces are dynamic. Dynamic loads have been considered only in small-scale problems. Recently, an algorithm for dynamic response optimization using transformation of dynamic loads into equivalent static loads has been proposed. The transformation is conducted to match the displacement fields from dynamic and static analyses. This algorithm can be applied to large-scale problems. However, the application has been limited to size optimization. The present study applies the algorithm to shape optimization. Because the number of degrees of freedom of finite element models is usually very large in shape optimization, it is difficult to conduct dynamic response optimization with conventional methods that directly treat dynamic response in the time domain. The optimization process is carried out by interfacing an optimization system and an analysis system for structural dynamics. Various examples are solved to verify the algorithm. The results are compared to the results from static loads. It is found that the algorithm using static loads transformed from dynamic loads based on displacement is valid for very large-scale shape optimization problems. Copyright © 2005 John Wiley & Sons, Ltd.
Cited by 40
Dtug Bys Electe F, A Ij, R. Johnson et al. · 2016
LW. m nWmsoAVAMAORM UATEMI.Wmmmia ooa Approved for public release; distribution is unlimited. I aam8TAfrdmwi.o om) SAP IV is a general purpose finite element analysis program for linear structural analysis. The program can analyze structures that are subject to either static or dynamic loads. The structures can be described in tarns of truss frame, plate, shell, or brick elements or combinations of elements. The static loads include concentrated loading applied to discrete points on the structural modes, and loads, co a ted loading applied to discrete points on the structural models; and loads. concentrat or unifom applied to indiul elements in the model The loads can be combined into load came. The dynamic analysis features include modal analysis to obtain mode shapes and frequencies, response history analysis using either modal superposition or direct integration techniques, and response spectrum analysis. Structural analysis, finite element analysis, modal analysis, response spectra analysis, time 119
Cited by 0
Youngmyung Lee, Gyung-Jin Park · Proceedings of the Institution of Mechanical Engineers Part D Journal of Automobile Engineering · 2016
Vehicle crash optimization is a representative non-linear dynamic response structural optimization that utilizes highly non-linear vehicle crash analysis in the time domain. In the automobile industries, crash optimization is employed to enhance the crashworthiness characteristics. The equivalent-static-loads method has been developed for such non-linear dynamic response structural optimization. The equivalent static loads are the static loads that generate the same displacement field in linear static analysis as those of non-linear dynamic analysis at a certain time step, and the equivalent static loads are imposed as external loads in linear static structural optimization. In this research, the conventional equivalent-static-loads method is expanded to the crash management system with regard to the frontal-impact test and a full-scale vehicle for a side-impact crash test. Crash analysis frequently considers unsupported systems which do not have boundary conditions and where adjacent structures do not penetrate owing to contact. Since the equivalent-static-loads method uses linear static response structural optimization, boundary conditions are required, and the impenetrability condition cannot be directly considered. To overcome the difficulties, a problem without boundary conditions is solved by using the inertia relief method. Thus, relative displacements with respect to a certain reference point are used in linear static response optimization. The impenetrability condition in non-linear analysis is transformed to the impenetrability constraints in linear static response optimization.
Cited by 16
Herbert E. Lindberg, Donald D. Anderson, R. D. Firth et al. · Defense Technical Information Center (DTIC) · 1965
The response of re-entry vehicle-type shells to blast loads is investigated and is described in terms of surface loads on the vehicle. Extensive data on both surface pressures and structural response of cylindrical and conical shells are presented. Peak pressure and impulse are identified as the important load characteristics which determine structural response and critical loads are presented in these terms. A theoretical description of dynamic buckling of cylindrical shells subjected to transient surface pressures is given to explain observed modes of failure and to predict critical loads for buckling over a wide range of load and structural parameters.
Cited by 0
R L Bass, Edgar Bowles, P. A. Cox · 1980
This paper presents an evaluation of dynamic sloshing loads in LNG cargo tanks. A comprehensive review of worldwide scale-model sloshing data is presented. The data are reduced to a common format for the purposes of defining design load coefficients. Additional scale-model laboratory experiments are conducted to establish the sloshing dynamic pressure-time histories which are necessary for structural response analysis. Analytical methods are presented which provide techniques for determining wall structural response to dynamic slosh loads. Finally, design methodology is presented for membrane and semimembrane tanks, gravity tanks, and pressure tanks whereby the design procedure sequences from comparing resonant sloshing periods to ship periods, defining the design loads, and designing the tank structures affected by dynamic slosh loads by delineated procedures which vary with tank type.
Cited by 25
Longinow,A, Reid P. Joyce · Defense Technical Information Center (DTIC) · 1980
The results of an experimental study which was conducted to determine the strength of residential, wood floor systems over basements to uniform static load are presented in this report. A single family residence which was slated for demolition was acquired and load tested. Two load tests were conducted. The first load test was concerned with the strength of the as-built floor system. One half of the floor system was instrumented and loaded to collapse. Failure was experienced as 185.4 psf. The second load test was concerned with the strenth of an expediently upgraded floor system. The remaining half of the floor system was upgraded by placing a studwall in the longitudinal direction halfway between the exterior wall and the girder in each of the two spans. The floor was loaded to 559.3 psf. At this load the test was terminated due to reasons of safety. The floor system did not fail. Additional tests were conducted in the laboratory on the unfailed portions of the floor system. This consisted of three 'simple beam' tests of samples consisting of two joists with flooring attached. The load was uniformly distributed. The loading in each case was accomplished using solid concrete block. Probability of people survival estimates are included for two shelter conditions. In the first, the shelter is assumed to consist of the as-built basement with one foot of soil over the floor for radiation protection. In the second, the shelter is assumed to consist of the expediently upgraded basement with one foot of soil for radiation protection. The probability of people survival is estimated against blast effects produced by the detonation of a single 1-MT nuclear weapon.
Cited by 0
Wichorek, G. R., Rummler, D. R. · NASA Technical Reports Server (NASA)
Structural response of tubular beryllium and beryllium aluminum alloy truss-type structures to dynamic and static loads
Cited by 0
William F. Crowder · 1958
Cited by 4
Yumeng Lei, Jing Hu, Zuyu Chen et al. · SSRN Electronic Journal · 2025
Cited by 0Open access
海林 叶 · Hans Journal of Civil Engineering · 2022
Cited by 0