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首页> 外文会议>Structural Engineers Association of California(SEAOC) Convention; 20040825-28; Monterey,CA(US) >Investigation into the Effects of Uplift on Simplified Seismic Design Procedures
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Investigation into the Effects of Uplift on Simplified Seismic Design Procedures

机译：研究隆起对简化抗震设计程序的影响

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摘要

Uplifting of and yielding below shallow foundations supporting rigid lateral-force resisting elements (such as shear-walls) can provide additional nonlinearity into a system's overall force-deformation behavior. While this nonlinearity may be advantageous, potentially reducing demands to the system, displacement compatibility may result in overstress of lateral and/or gravity resisting elements. Incorporating this balance of advantage versus consequence in structural design is the goal of performance-based earthquake engineering (PBEE).There are a variety of approaches suggested in design codes for estimating seismic demands and incorporating "performance" as a design goal. Current methods account for increased displacement of an equivalent SDOF system relative to the reduced design strength, however, not explicitly for the case of foundation uplift. To address this shortcoming, the interaction between the strength ratio R and the displacement ratio C_1 was investigated using the Beam-on-Nonlinear-Winkler-Foundation (BNWF) concept. Numerical models were constructed considering a range of soil-structure natural periods (T = 0.1 to 2.0 seconds) and a range of design R-values (R = 1.5, 2.0, 4.0 and 8.0). A suite of 19 ground motions with broad frequency and amplitude characteristics are used for the simulations. Results from these simulations indicate that current C_1-R suggestions are highly unconservative when uplifting foundations are anticipated. Using the calculated C_1-R relations, in this paper, a simple design example is presented and compared considering a variety of analysis approaches. In the example, the consequences of foundation uplifting are accounted for by estimating the vertical displacement (settlement) using empirical model test data and Housners' (1963) rocking block model.
机译：支撑刚性侧向抗力元件（例如剪力墙）的浅层基础下的抬升和屈服可以为系统的整体力变形行为提供额外的非线性。尽管这种非线性可能是有利的，可能会减少对系统的需求，但位移兼容性可能会导致横向和/或重力抵抗元件的过应力。基于性能与后果的平衡在结构设计中是基于性能的地震工程（PBEE）的目标。设计规范中建议了多种方法来估算地震需求，并将“性能”作为设计目标。当前方法相对于降低的设计强度考虑了等效SDOF系统位移的增加，但是，对于地基抬升的情况，并没有明确说明。为了解决该缺点，使用非线性梁维克勒基础（BNWF）概念研究了强度比R和位移比C_1之间的相互作用。考虑土壤结构自然周期范围（T = 0.1至2.0秒）和设计R值范围（R = 1.5、2.0、4.0和8.0）构建数值模型。模拟使用了一组19种具有广泛频率和振幅特性的地面运动。这些模拟的结果表明，当预计会抬高地基时，当前的C_1-R建议非常不保守。本文使用计算出的C_1-R关系，给出了一个简单的设计示例，并考虑了多种分析方法进行了比较。在该示例中，通过使用经验模型测试数据和Housners（1963）摇摆块模型估计垂直位移（沉降）来说明基础抬升的后果。

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