Controlled Rocking CLT Walls for Buildings in Regions of Moderate Seismicity: Design Procedure and Numerical Collapse Assessment

Controlled rocking heavy timber walls are designed to rock on their foundations in response to earthquakes. For regions of moderate seismicity, it is proposed that this rocking behaviour can be adequately controlled using only post-tensioning, even with a large force-reduction factor and no supplemental energy dissipation. This article presents a force-based design procedure for controlled rocking cross-laminated timber walls without supplemental energy dissipation, including a method for estimating higher mode effects. Fragility analyses of three prototype walls demonstrate that the procedure can limit the probability of collapse to <10% during a maximum considered earthquake in a region of moderate seismicity.     

Book reviews

Regions in Europe. Patrick Le Galès and Christian Lequesne (Eds). London, Routledge, 1998, 305. pp., ISBN 0 415 16483 4

Unemployment and Social Exclusion: Landscapes of Labour Inequality. Paul Lawless, Ron Martin and Sally Hardy (Eds). London, Jessica Kingsley 1998, 280 pp., £17.95 pb, ISBN 1 85302 341 8

Cities Back from the Edge. Roberta Brandes Gratz (with Norman Mintz). Chichester, John Wiley, 1998, £24.95, ISBN 0 471 14417 7     

Burma's ‘saffron revolution’ and the limits of international influence

The demonstrations in September 2007 were the most significant civil protests seen in Burma since the ill-fated pro-democracy uprising of 1988. The military government's brutal response to the latest unrest prompted an unprecedented level of diplomatic activity and a rare consensus on the need for political change. Since then, however, efforts to resolve the crisis have withered away, underlining the international community's inability over the past 20 years to make a significant impact on the situation in Burma. Neither the principled approach of some countries and organisations, nor the more pragmatic attitude adopted by others, has persuaded the regime to abandon any of its core positions. Indeed, by demonstrating the international community's continuing disagreement over Burma, and the limited policy options available, the lack of concerted action since the protests has probably encouraged the regime's obduracy and increased its confidence that it can survive external pressures. An appreciation of the generals’ threat perceptions may help the international community to understand the regime's intransigence, but it is still difficult to see what policies can be effective against a government that puts its own survival before accepted norms of behaviour and the welfare of its people. Real and lasting change will have to come from within Burma itself, but the events of 2007 suggest that this is a distant prospect.     

How Do Unionists Vote? Estimating the Causal Impact of Union Membership on Voting Behaviour from 1966 to 2004

This paper explores the voting patterns of trade union members in Australian elections conducted between 1966 and 2004 and finds that, on average, 63% of trade union members vote for the Australian Labor Party. Despite the fact that union membership declined from around half of the workforce in the early 1980s to a quarter of the workforce in the early 2000s, unionists have not become more pro-Labor. Analysing unionists' voting behaviour by gender, it is found that male unionists were more pro-Labor than female unionists in the 1960s, but that the reverse is true today. Recognising that union membership may be endogenous with respect to political ideology, this study instruments for union membership and concludes that the observed association between union membership and voting reflects a causal relationship.