Reliability of Steel Frames Designed with Advanced Analysis
Reliability of Steel Frames Designed with Advanced Analysis
复制标题
采用高级分析设计的钢框架的可靠性
DOI：
--
复制
发表时间：
2006
期刊：
影响因子：
--
通讯作者：
B. Schafer
中科院分区：
文献类型：
--
作者：
S. Buonopane;B. Schafer
通过高级分析设计钢框架可以产生更高效的结构，同时通过结合非线性结构分析保持令人满意的可靠性水平。对通过荷载和阻力系数设计（LRFD）和先进分析方法设计的一系列两层两间钢框架的结构可靠性进行了比较。屈服强度和重力载荷被建模为随机变量。通过蒙特卡罗模拟和一阶近似计算两个失效准则（塑性塌陷和第一塑性铰链）的强度分布和失效概率。结果表明 LRFD 方法成功地增强了首次塑性铰接的目标可靠性。相比之下，通过高级分析进行的设计可产生可接受的抗塑性塌陷可靠性，但在使用负载水平下出现塑性铰链的可能性相对较大。基于高级分析的规范可能需要更多地关注适用性标准。高级分析的阻力因子是根据两个目标可靠性级别的强度分布计算的。基于系统的失效标准（例如塑料框架倒塌）在确定适用于各种结构的阻力系数时存在根本性困难。
The design of steel frames by advanced analysis can result in more efficient structures while maintaining satisfactory levels of reliability by incorporating nonlinear structural analysis. The structural reliabilities of a series of two-story, two-bay steel frames designed by both load and resistance factor design (LRFD) and advanced analysis methods are compared. Yield strength and gravity loads are modeled as random variables. Strength distributions and probabilities of failure are calculated by Monte Carlo simulation and first-order approximation for two failure criteria—plastic collapse and first plastic hinge. The results indicate that LRFD methods successfully enforce the target reliability on first plastic hinging. In contrast, design by advanced analysis results in acceptable reliabilities against plastic collapse, but relatively large probabilities of plastic hinging at service load levels. Specifications based on advanced analysis may require greater attention to serviceability criteria. Resistance factors for advanced analysis are calculated based on the strength distributions for two levels of target reliability. System-based failure criteria, such as plastic frame collapse, present a fundamental difficulty in determining resistance factors applicable to a wide-range of structures.