4. REASON,AGENCY, AND HISTORY: REMARKS ON KANT AND BENJAMIN

This essay begins by determining the nature of Richard Eldridge's project. Referring mainly to writings by Immanuel Kant and Walter Benjamin, I view his attempt as considering what it involves to be an agent in a historical setting. According to Eldridge, the correct answer will have to involve the right combination of Kant's emphasis on rational self‐determination and Benjamin's account of spontaneous (yet nonrational) self‐transformation. In response to this answer, I suggest that Benjamin's view may not easily lend itself to being made compatible with Kantian thinking. In particular, Benjamin's effort to think experience in terms that do not make any reference to rational self‐determination must be viewed as deeply foreign to Kant's project. I also argue that Kant's third Critique, in particular its conception of reflective judgment, could have provided Eldridge with a view of agency and experience that does not deviate substantially from Kant's project elsewhere. At the end of the essay, I argue that the duality we find in Eldridge's exposition should be viewed as not only related to individuals but to society in general. An attempt to resolve it must involve reflection on how historically constituted social forms create such stark oppositions between reason and its other.     

THE 20TH-CENTURY REVOLUTION IN TEXTILE MACHINES AND PROCESSES. PART 1: SPINNING AND WEAVING

Abstract

This paper reviews the textile revolution of the mid-20th century, a subject little studied by archaeologists, unlike the developments of the 18th and early 19th centuries. The consequences of this revolution pose new challenges to the industrial archaeologist, since the legacy is not distinctive buildings and urban landscape, but the machinery and fabrics themselves. This is the first instalment of a two-part study, looking at the development of the spinning and weaving in the period 1950–85.     

SEISMIC DESIGN AND RESPONSE OF BARE AND MASONRY-INFILLED REINFORCED CONCRETE BUILDINGS. PART I: BARE STRUCTURES

Abstract

Eurocode 8 is applied for the complete design of 26 multi-storey reinforced concrete buildings to study its operationally and compare the implications of trading strength for ductility through designing the same structure for a different Ductility Class. The difference between the conventional full Capacity Design of columns in bending and the relaxed one allowed by Eurocode 8 is quantified, and the implications on the column capacities are examined. About half of the designed buildings, representative of the class of regular frames, are subjected to nonlinear dynamic response analyses to spectrum-compatible motions with intensities up to twice that of the design motion. Nonlinear modeling is very simple, but gives satisfactory agreement with available quasistatic or pseudodynamic test results on full scale structures. Results show that the three Ductility Classes of Eurocode 8 are essentially equivalent in terms of material quantities and seismic performance. Within the limitations of the nonlinear modelling, the response results suggest very satisfactory performance of structures designed to Eurocode 8, even under twice the design motion intensity. Softening of the structure due to concrete cracking and steel yielding significantly reduces the seismic force demands and contributes to the satisfactory performance, despite the increased P — 6 effects. Another important contributor to the good performance is the significant overstrength of the members considered in the analyses with their average as-built properties. Beam overstrength due to the contribution of the slab to flexural capacity is large enough to overcome the effects of the application of the relaxed Capacity Design rule to columns in bending. However, the resulting column plastic hinging does not lead to drift concentrations suggesting formation of storey-sway mechanisms.     

SEISMIC DESIGN AND RESPONSE OF BARE AND MASONRY-INFILLED REINFORCED CONCRETE BUILDINGS. PART II: INFILLED STRUCTURES

The effects of masonry infills on the global seismic response of reinforced concrete structures is studied through numerical analyses. Response spectra of elastic SDOF frames with nonlinear infills show that, despite their apparent stiffening effect on the system, infills reduce spectral displacements and forces mainly through their high damping in the first large post-cracking excursion. Parametric analyses on a large variety of multi-storey infilled reinforced concrete structures show that, due to the hysteretic energy dissipation in the infills, if the infilling is uniform in all storeys, drifts and structural damage are dramatically reduced, without an increase in the seismic force demands. Soft-storey effects due to the absence of infills in the bottom storey are not so important for seismic motions at the design intensity, but may be very large at higher motion intensities, if the ultimate strength of the infills amounts to a large percentage of the building weight. The Eurocode 8 provisions for designing the weak storey elements against the effects of infill irregularity are found to be quite effective, in general, for the columns, but unnecessary and often counterproductive for the beams.     

THE 20TH-CENTURY REVOLUTION IN TEXTILE MACHINES AND PROCESSES. PART 2: TEXTURED YARNS AND OTHER TECHNOLOGIES

Abstract

This is the second of a two-part study on the archaeology and technological development of the machine textile industry in the 20th century. The previous paper, Part 1 (IAR, 35·2), described the changes in two long-established textile technologies: the production of yarns from short fibres such as cotton and wool; and the weaving of fabrics. The main part of this paper describes completely new technologies that resulted from the manufacture of new continuous filament yarns. Other technologies are also mentioned.