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首页> 外文期刊>Structural Design of Tall Buildings >STRUCTURAL PERFORMANCE AND ECONOMICS OF TALL HIGH STRENGTH RC BUILDINGS IN SEISMIC REGIONS
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STRUCTURAL PERFORMANCE AND ECONOMICS OF TALL HIGH STRENGTH RC BUILDINGS IN SEISMIC REGIONS

机译：地震地区高层高强钢筋混凝土结构的结构性能和经济性

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摘要

For a multitude of economic and societal considerations, high rise structures are on the increase. This in turn promotes the use of high strength materials to reduce column size and construction times. Whereas design guidance and engineering understanding of high strength RC structures under static loading is well-developed, little work has been undertaken on the economics of whole buildings and their performance under earthquake loading. In this paper, l0 buildings of 24 stories are designed and detailed according to modern seismic codes. The buildings are all nominally equivalent, using a stiffness equivalence criterion and its derivatives. The cost of construction is compared in terms of steel, concrete and formwork. The static inelastic response of the buildings is also assessed, followed by a full nonlinear dynamic analysis of all buildings using three earthquake records at the design acceleration and twice the design va1ue. Comprehensive assessment of the static and dynamic results is undertaken. It is concluded that the cost increase is mainly due to the steel, whilst significant member reductions may be availed of by using high strength concrete. The behaviour of high strength concrete structures is not inferior to that of normal strength materials. Indeed, it is observed that lower levels of overstrength can be achieved in high strength materials than in their normal strength counterparts, mainly due to the over- reinforcement of the latter to resist vertical forces. Recommendations on the use of equivalent cracked stiffness for period calculation in design, and also effective periods for use in displacement-based design, are given.
机译：出于多种经济和社会考虑，高层建筑正在增加。反过来，这促进了高强度材料的使用，以减少色谱柱尺寸和缩短施工时间。尽管对静载荷下高强度钢筋混凝土结构的设计指导和工程理解已经得到了很好的发展，但是关于整座建筑物的经济性及其在地震载荷下的性能方面所做的工作很少。在本文中，根据现代地震法规设计并详细描述了10层24层的建筑物。使用刚度等效准则及其派生，建筑物在名义上都是等效的。比较建筑成本的钢，混凝土和模板。还评估了建筑物的静态非弹性响应，然后使用三个地震​​记录（设计加速度为设计值的两倍）对所有建筑物进行了完全非线性的动力学分析。对静态和动态结果进行了综合评估。结论是，成本增加主要是由于钢材，而使用高强度混凝土可显着减少构件数量。高强度混凝土结构的性能并不低于普通强度材料的性能。确实，已经观察到，与常规强度的材料相比，高强度材料可以实现更低的超强度水平，这主要是由于后者的过度增强以抵抗垂直力。给出了有关在设计中使用等效裂纹刚度进行周期计算的建议，以及在基于位移的设计中使用有效周期的建议。

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