摘要:

AbstractThis paper presents the results of a shaking table study conducted on the seismic behaviour of curved reinforced concrete bridge structures of the type used in highway interchanges. A series of representational 1/30th scale models was constructed in microconcrete to study the effects of both linear and non‐linear dynamic behaviour, the non‐linearity including sliding and impacting at the expansion joints and ductility in the columns. Each model was subjected to a series of increasingly severe simulated earthquakes in the longitudinal and transverse directions, both with and without the vertical component. Response data were recorded in the form of selected displacement time‐histories which were subsequently used as control data in a companion theoretical study. Each model was eventually taken to failure which consisted primarily of extensive damage at the expansion joints. The paper concludes with general observations on the seismic behaviour of long‐span long‐period curved bridges, and emphasizes the sensitivity of this behaviour to the location and design of t

ISSN:0098-8847    

DOI:10.1002/eqe.4290070202

出版商:John Wiley&Sons, Ltd    

年代:1979

数据来源: WILEY

摘要:

AbstractCorrelations between analytical and experimental seismic responses of a curved model bridge structure, which was constructed to have the same features as a typical full‐scale high curved highway bridge structure, are presented. Dynamic behaviour and seismic response of the experimental bridge model are examined with particular emphasis on the discontinuous behaviour of expansion joints. Modelling of Coulomb type friction with slippages and impacting at the expansion joints is described. Correlations of displacement response of the bridge model carried out for three seismic excitations are presented. Parameter studies conducted to assist in the interpretation of correlation results are presented and the characteristics of the dynamic behaviour of the bridge model are discusse

ISSN:0098-8847    

DOI:10.1002/eqe.4290070203

出版商:John Wiley&Sons, Ltd    

年代:1979

数据来源: WILEY

摘要:

AbstractA numerical method is shown to analyse the dynamic elastic‐plastic responses of those structures with known elastic solutions. The displacement at one point at timetcaused by a unit load applied at another point at zero time, called dynamic influence coefficient, is calculated from the known elastic solutions. Incremental plastic strain is accounted for by a set of additional incremental loads, so the stiffness matrix and the eigenvectors do not vary with time. From the incremental load including that caused by the incremental plastic strain, the displacementvs.time of the structure is obtained.This method is applied to simply supported beams with bilinear stress‐strain relations with different strain‐hardening rates and to a simply supported elastic‐ideally plastic rectangular plate. This procedure can be extended to structures with no available known analytical elastic solutions. For these structures, the elastic solutions can be obtained by the finite element

ISSN:0098-8847    

DOI:10.1002/eqe.4290070204

出版商:John Wiley&Sons, Ltd    

年代:1979

数据来源: WILEY

摘要:

AbstractAn analysis is made of the coupled lateral‐torsional response of a partially symmetric single‐storey building model to horizontal translatory earthquake excitation. Interest centres on the evaluation of realistic estimates for two equivalent static actions (a shear and a torque) which account for the worst dynamic consequences of torsional unbalance. The results substantiate the findings of previous investigations which have given rise to the belief that strong modal coupling and severely coupled lateral and torsional responses are possible even in nominally symmetric buildings. The response of the model is assumed to be linearly elastic and viscously damped.In a preliminary analysis the equations of motion are solved using the modal analysis technique and the conditions necessary for full modal coupling are ascertained.Then by employing the design spectrum concept, together with suitably conservative procedures for combining the modal maxima, dimensionless forms of the equivalent static actions are evaluated as functions of two independent parameters. The final results are furnished by modified square root of the sum of the squares (SRSS) combination functions which take account of the spacing between the translational and torsional frequencies. Examples at the end of the paper illustrate the practical significance of the w

ISSN:0098-8847    

DOI:10.1002/eqe.4290070205

出版商:John Wiley&Sons, Ltd    

年代:1979

数据来源: WILEY

摘要:

AbstractAnalytical study of random vibration of non‐linear mutli‐degree‐of‐freedom (MDF) systems is generally difficult. This is particularly true for MDF inelastic systems due to the highly non‐linear and hereditary behaviour of the restoring force. On the other hand, to obtain the response statistics using a step‐by‐step Monte Carlo simulation requires a large sample, and it could be very costly. The purpose of this paper is to present a practical analytical‐empirical method for an MDF yielding system. The method is based on a substitute structure (SS) concept in which the SS parameters are determined from empirical results of single‐degree‐of‐freedom systems, i.e. each element in the system is replaced by a linear counterpart with ductility‐dependent stiffness and damping. Based on a linear random vibration response analysis, the statistics of the maximum response (ductility) of each element are obtained by iteration. Numerical examples are given for multi‐storey buildings with deteriorating (reinforced concrete frame) or non‐deteriorating (steel frame) restoring forces. Comparisons with empirical results are satisfactory qualitatively. The main advantage of this method is that it requires relatively insignificant computation time, e.g. 1 s of execution time on the IBM 360–75 system fo

ISSN:0098-8847    

DOI:10.1002/eqe.4290070206

出版商:John Wiley&Sons, Ltd    

年代:1979

数据来源: WILEY

ISSN:0098-8847    

DOI:10.1002/eqe.4290070207

出版商:John Wiley&Sons, Ltd    

年代:1979

数据来源: WILEY

ISSN:0098-8847    

DOI:10.1002/eqe.4290070208

出版商:John Wiley&Sons, Ltd    

年代:1979

数据来源: WILEY

ISSN:0098-8847    

DOI:10.1002/eqe.4290070209

出版商:John Wiley&Sons, Ltd    

年代:1979

数据来源: WILEY

ISSN:0098-8847    

DOI:10.1002/eqe.4290070201

出版商:John Wiley&Sons, Ltd    

年代:1979

数据来源: WILEY