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Seismic performance assessment and probabilistic repair cost analysis of precast concrete cladding systems for multistory buildings.

机译：多层建筑物预制混凝土覆层系统的抗震性能评估和概率维修成本分析。

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摘要

Analytical and experimental tests have shown that the seismic response of multistory moment-frame structures with precast concrete cladding in moderate to severe earthquakes is significantly influenced by the cladding system. The purpose of the research discussed in this dissertation is to study the effect that the cladding system has on the structural response of multistory buildings, to develop analytical equations to estimate the seismic demands in the cladding connections, to calculate the probability of failure of typical cladding connections, and to determine the postearthquake repair costs and repair times of typical cladding systems.;The nine-story LA SAC steel moment-frame building is selected as the study building, and a two-dimensional, nonlinear model is developed of the bare-frame structure in OpenSees. The steel moment-resisting frame of the bare-frame structure is modeled using nonlinear force beam-column line elements capable of representing distributed plasticity along their length. The frame connections are reduced-beam section (RBS) moment connections, and their modeled cyclic moment-rotation behavior is based on experimental test results of the connection. Analytical models of three different precast cladding designs are applied to the bare-frame structure to study their effect on the building's seismic response. The three cladding designs represent common systems used in regular multistory buildings in modern construction.;The effects of the cladding on the seismic response of the bare-frame structure are studied by performing modal analyses, nonlinear static pushover analyses, and nonlinear dynamic timehistory analyses of the analytical models. The inclusion of cladding decreases the fundamental period of the building by only 4%; however, the effects of the cladding on the maximum interstory drifts, floor accelerations, and plastic hinge rotations are significant. Time-history analyses of each model are performed using 140 ground motions. The ground motions in each bin are scaled by a common factor (cloud method with constant scaling) to ensure nonlinear response was captured. The time-history results are plotted in log-log space, and a linear trend line is fitted to the data to represent the mean maximum response values. The time-history results reveal that the addition of cladding reduces the mean maximum interstory drift ratios in the bareframe model by up to 22%, 28%, and 33% for the 50%-, 10%-, and 2%-in-50 year probability of exceedance levels, respectively. The reductions in interstory drift are the largest for cladding type C3 and smallest for cladding type C1. The mean residual interstory drifts are small for all levels of intensity and were not significantly affected by the cladding. The mean maximum floor accelerations are not significantly affected by cladding types C1 and C2: the mean values of maximum floor accelerations in the bare frame structure are reduced by only 8% for these two cladding types.;The time-history analysis results show that significant deformations develop in the column cover connections in moderate earthquakes. The deformations exceed the life-safety, and in some cases, the collapse prevention performance criteria. Thus, the failure probabilities of the column cover connections subject to multiple hazard levels are investigated using structural reliability theory. The analytical equations for estimating the deformations in the column cover connectors are used to construct the limit-state function describing the structural reliability of the connectors. The random variables consist of the maximum interstory drift, the gap width in the slotted connections, and the failure shear deformation in the connectors. The deterministic parameters in the limit-state functions are the panel dimensions and the story height. The correlation coefficients are calculated for the maximum interstory drifts between different stories.;To gain additional insight on the seismic performance of multistory buildings with cladding, post-earthquake repair cost analyses are performed on the analytical models using the performance-based earthquake engineering (PBEE) methodology developed by the Pacific Engineering Earthquake Research (PEER) Center.Based on the repair cost analyses, it is apparent that cladding type C2 is the most cost-effective cladding design. Because the cladding panels have window punch-outs, the window panes are protected from damage due to interstory drift. In addition, cladding type C2 does not use the highly damageable column cover connections that are expensive to repair. (Abstract shortened by UMI.)
机译：分析和实验测试表明，在中等至严重地震中，带有预制混凝土覆层的多层弯矩框架结构的地震响应受覆层系统的影响很大。本文的研究目的是研究立面系统对多层建筑物的结构响应的影响，建立解析方程来估算立面连接处的地震需求，计算出典型立面破坏的概率。连接，并确定典型覆层系统的震后维修成本和维修时间。；选择9层的LA SAC钢制矩型框架建筑物作为研究建筑物，并为裸露的地面建立了二维非线性模型。 OpenSees中的框架结构。使用能够表示沿其长度分布的可塑性的非线性力梁-柱线单元，对裸框架结构的钢制抗弯框架进行建模。框架连接为减束截面（RBS）弯矩连接，其建模的循环弯矩-旋转行为基于该连接的实验测试结果。将三种不同的预制覆层设计的分析模型应用于裸框架结构，以研究其对建筑物地震响应的影响。这三种覆层设计代表了现代建筑中常规多层建筑中常用的系统。;通过进行模态分析，非线性静力推覆分析和非线性动力时程分析，研究了覆层对裸框架结构地震响应的影响。分析模型。包层的加入使建筑物的基本周期仅降低了4％；然而，包层对最大层间位移，地板加速度和塑料铰链旋转的影响是显着的。每个模型的时程分析是使用140次地面运动进行的。每个仓中的地面运动都通过一个公共因子（具有恒定缩放比例的云方法）进行缩放，以确保捕获非线性响应。将时间历史结果绘制在对数-对数空间中，并将线性趋势线拟合到数据以表示平均最大响应值。时程结果显示，在50％，10％和2％的情况下，增加包层可将裸帧模型中的平均最大层间漂移率降低多达22％，28％和33％。超过50年的超标概率。层间漂移的减小对于C3型覆层最大，而对于C1型覆层最小。在所有强度水平下，平均残余层间漂移均很小，并且不受覆层影响。平均最大地板加速度不受覆层类型C1和C2的影响：这两种覆层类型的裸框结构中最大地板加速度的平均值仅降低了8％;时间历史分析结果表明，显着在中等地震中，柱盖连接处会发生形变。变形超过了生命安全，在某些情况下超过了防倒塌性能标准。因此，使用结构可靠性理论研究了承受多种危险等级的柱盖连接的失效概率。用于估计柱盖连接器变形的解析方程用于构造描述连接器结构可靠性的极限状态函数。随机变量包括最大层间偏移，开槽连接中的间隙宽度以及连接器中的破坏剪切变形。极限状态函数中的确定性参数是面板尺寸和故事高度。计算不同层之间最大层间位移的相关系数;;为进一步了解带有覆层的多层建筑物的抗震性能，使用基于性能的地震工程（PBEE）对分析模型进行了震后维修成本分析由太平洋工程地震研究（PEER）中心开发的方法。基于维修成本分析，显然C2型覆层是最具成本效益的覆层设计。由于覆层板上有窗户打孔，因此可以防止窗玻璃由于层间偏移而损坏。此外，C2型包层不使用维修费用昂贵的高度损坏的色谱柱盖连接。 （摘要由UMI缩短。）

著录项

  • 作者

    Hunt, Jeffrey Patrick.;

  • 作者单位

    University of California, Berkeley.;

  • 授予单位 University of California, Berkeley.;
  • 学科 Engineering Architectural.;Engineering Civil.
  • 学位 Ph.D.
  • 年度 2010
  • 页码 301 p.
  • 总页数 301
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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