Beyond conventional capacity design: towards a new design philosophy
Beyond conventional capacity design: towards a new design philosophy
复制标题
超越传统容量设计：走向新的设计理念
DOI：
--
复制
发表时间：
2010
期刊：
影响因子：
--
通讯作者：
I. Anastasopoulos
中科院分区：
文献类型：
--
作者：
I. Anastasopoulos
本文阐明了一种新的抗震设计理念，它利用土壤的“失败”，以保护上部结构。传统的“容量设计”的逆转介绍，通过故意设计的基础。一个简单但现实的桥梁被用作新哲学有效性的说明性例子。两种方案进行了比较：一个符合传统的能力设计，与超设计的基础，使塑性“铰链”的发展在上部结构;和一个设计的基础，使塑性“铰链”可能会发生在土壤中。通过数值（有限元）和实验（振动台）模拟研究了这两种方案的抗震性能。结果表明，这两种方案的性能是完全可以接受的中等地震运动。对于大强度的地震运动，新方案的性能被证明是有利的，不仅避免倒塌，但几乎没有遭受任何非弹性结构变形。当然，总要付出代价，这无非是地基沉降和剩余旋转的增加。
The paper illuminates a new seismic design philosophy, which takes advantage of soil “failure” to protect the superstructure. A reversal of conventional “capacity design” is introduced, through intentional under-designing of the foundation. A simple but realistic bridge is used as an illustrative example of the effectiveness of the new philosophy. Two alternatives are compared : one in compliance with conventional capacity design, with over-designed foundation so that the plastic “hinge” develops in the superstructure ; and one with under-designed foundation, so that the plastic “hinge” may occur in the soil. The seismic performance of the two alternatives is investigated through numerical (finite element) and experimental (shaking table) simulation. It is shown that the performance of both alternatives is totally acceptable for moderate seismic motions. For large intensity seismic motions, the performance of the new scheme is shown to be advantageous, not only avoiding collapse but hardly suffering any inelastic structural deformation. Naturally, there is always a price to pay, which is none other than increased foundation settlement and residual rotation.