日本结构抗震加固的工程实例

本文由株式会社日建设计的结构设计部工程师具体介绍了一些地震加固工程实例。由于日本是多地震国家,不仅在结构设计时要求建筑物在地震后易于加固,而且在结构加固时也要求加固得足以抵抗将来可能发生的更强烈的地震,以保证建筑物的耐久性能。在日本,抗震理论和技术年复一年地提高,这里,主要介绍两种地震加固的方法—制振和隔震。实例1是采用含低屈服点钢材的吸能支撑(Energy Absorption Bracing,EAB)来进行地震加固的例子。该建筑建造于1970年,是一个64m高的型钢骨混凝土结构(Steel framed Re-inforced Concrete,SRC)。实例2是建于1920年的一所大学的小礼拜堂。这个2层的建筑高12.6m,由砖建成。在经过多方调查后,提出了三种方案来对其进行地震加固,最终选用了基底隔震技术来使得建筑上部的钢筋用量最小。实例3是一个国际儿童文献图书馆的改造工程,该图书馆成功地保留了原来建筑的历史价值,并且又增加了很多当代图书馆的新功能。在该工程中采用了基底隔震技术。

Examples of Seismic Retrofitting in Japan

This paper shows some examples of seismic retrofitting designed by Nikken Sekkei.Because there are many earthquakes in Japan,buildings must not only be able to be simply repaired,but also be strengthened to resist more large earthquakes so they can be used for a long time in the future.The theory and technology of earthquake-proofing is improving year by year.Here we will introduce two methods of seismic retrofitting:seismic vibration control and base isolation retrofitting. Example 1 is an examination of retrofitting using EAB: energy absorption bracing with low-yield-point steel.The retrofitting is examined with an application to a 64m high-rise SRC (steel framed reinforced concrete) building built in 1970.Example 2 is a chapel in a university built in 1920.The 2-story building is 12.6m high and made of brick work.After many kinds of survey,we proposed three ideas of seismic retrofitting and selected base isolation retrofitting to minimize reinforcement of upper part of building. Example 3 is a renovation project for the International Library of Children's Literature that successfully preserves the historical value of the original building while adding new functions of a contemporary library.A base isolation retrofitting system was introduced.