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DETERMINATION OF DISPLACEMENT LIMITS FOR THE SEISMIC REHABILITATION OF CONCRETE BUILDINGS

机译：确定混凝土建筑物地震恢复时的位移极限

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摘要

As our understanding of the response of buildings to earthquakes improves, design codes in seismic regions around the world are changing to keep up with advances in the understanding of building performance. These changes demand the development of new analytical tools and procedures to satisfy the emerging design criteria. This paper describes analytical procedures that can be used with the voluntary ordinance for hazard reduction in existing concrete buildings in the City of Los Angeles, a typical example of the new, displacement-based seismic rehabilitation criteria. Disp1acement-based procedures demand an accurate representation of element stiffness over the entire range of building behavior and the methodology described herein determines element stiffness with nonlinear analyses that begin with the stress strain relationships of concrete and steel. Methods for determining the material stress versus strain relationships are reviewed, and the effects of lateral confinement and tension stiffening on concrete behavior are demonstrated. Material behavior is then extended to the development of momenbeurvature relationships, which are the basis for determining the change in stiffness of flexural elements with increasing deformation. Displacement limits of the structure are determined by correlating the calculated building displacements and story drifts to strains and curvatures at critical cross sections. The paper presents techniques for performing this correlation by considering the redistribution of forces that occurs with changes in member stiffness at different displacement levels and by applying basic structural mechanics principles.
机译：随着我们对建筑物对地震响应的理解的提高，全球地震地区的设计规范也在不断变化，以跟上对建筑物性能的理解。这些变化要求开发新的分析工具和程序，以满足新兴的设计标准。本文介绍了可用于自愿性条例的分析程序，该程序可用于减少洛杉矶市现有混凝土建筑物中的灾害，这是基于位移的新地震修复标准的典型示例。基于位移的过程要求在整个建筑行为范围内准确表示单元刚度，并且本文所述的方法通过非线性分析来确定单元刚度，非线性分析始于混凝土和钢的应力应变关系。审查了确定材料应力与应变关系的方法，并论证了侧向约束和拉伸刚度对混凝土性能的影响。然后，将材料行为扩展到弯矩关系的发展，弯矩关系是确定挠曲元件刚度随变形增加的变化的基础。结构的位移极限是通过将计算出的建筑物位移和楼层位移与关键截面处的应变和曲率相关联来确定的。本文介绍了通过考虑在不同位移水平下随着构件刚度变化而发生的力的重新分布以及通过应用基本结构力学原理来执行此关联的技术。

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