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首页> 外文期刊>Advances in Engineering Software >Seismic design and performance of multi-tiered steel braced frames including the contribution from gravity columns under in-plane seismic demand
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Seismic design and performance of multi-tiered steel braced frames including the contribution from gravity columns under in-plane seismic demand

机译：多层钢支撑框架的抗震设计和性能，包括平面地震需求下重力柱的影响

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This paper examines the possibility of mobilizing gravity columns in the resistance of in-plane bending moments imposed on the columns of multi-tiered steel braced frames subjected to seismic loading. This would be the case when horizontal struts are used to connect gravity columns to braced frames at every tier level, as is often seen along exterior walls. A seismic design strategy based on the AISC Seismic Provisions is presented for four-tiered prototype steel concentrically braced frames. Three different approaches are proposed for the design of the braced frame and gravity columns. A set of 12 four-tiered X-braced frames, ranging from 15 to 30 m in height and located in a high seismic area were designed based on the proposed design approaches. The seismic behavior of the frames is evaluated using nonlinear response history analysis. The results show that the seismic performance of the braced frames is improved as nonlinear seismic demand on the bracing members is reduced when mobilizing the gravity columns for lateral resistance. Furthermore, gravity columns bending moment demands are distributed between braced frame and gravity columns in proportion of their relative flexural stiffness. Adequate seismic performance and cost-effective design can be achieved when columns of both types are designed to resist their respective share of the flexural demand. Alternatively, satisfactory response was achieved when the gravity columns are verified for the seismic induced bending moments acting together with concomitant axial loads.
机译：本文研究了在承受地震荷载的多层钢支撑框架的柱上施加平面内弯矩抵抗力时，动员重力柱的可能性。当使用水平支柱将重力柱连接到每一层水平的支撑框架时，情况就是如此，这通常是沿外墙看到的。针对四层原型钢同心支撑框架，提出了基于AISC抗震规定的抗震设计策略。提出了三种不同的方法来设计支撑框架和重力柱。基于所提出的设计方法，设计了一组12个四层X支撑框架，其高度在15至30 m之间，并且位于高地震区域。使用非线性响应历史分析评估框架的抗震性能。结果表明，当动员重力柱进行侧向阻力时，由于减少了支撑构件的非线性地震需求，因此改善了支撑框架的抗震性能。此外，重力柱的弯矩要求按其相对抗弯刚度的比例分配在支撑框架和重力柱之间。当两种类型的立柱都设计成能抵抗其各自的挠曲需求时，就可以实现足够的抗震性能和经济高效的设计。另外，当对重力柱进行地震作用引起的弯矩与轴向载荷共同作用时，可以获得令人满意的响应。

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