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Quasi-Static Reversed Cyclic Testing of Pre-1960 Wood Cripple Walls with Stucco Exterior Finishes: Evaluating the Impact of Retrofit
Quantifying the performance of retrofitted and un-retrofitted single-family wood-frame dwellings has become increasingly important in California due to the high seismicity of the state and the poor seismic resiliency of some portions of the housing stock. From field observations of past earthquakes, it has been found that inadequate lateral bracing of cripple walls and inadequate sill bolting are the primary reasons for failures of residential dwellings even in the event of moderate earthquakes. While methods to retrofit weak cripple walls and improve sill anchorage have been developed, the performance benefits of these changes have not been experimentally quantified. In addition, little knowledge is available to quantify the performance of existing dwellings. To address this limitation, a multi-university experimental investigation was undertaken as part of a collaborative PEER project funded by the CEA, with the ultimate goal of supporting numerical model validation and ultimately loss modeling of older residential dwellings. Particular emphasis was given to characterizing the performance of cripple walls retrofit using the recently published FEMA P-1100 guidelines: Vulnerability-Based Seismic Assessment and Retrofit of One- And Two-Family Dwellings. This paper focuses on presenting select test results from cripple wall component specimens tested under reversed cyclic quasi-static loading. Results in the present paper emphasize comparison amongst like existing and retrofit specimens with stucco and stucco over sheathing exterior finishes. Overall, results from these tests indicate that the FEMA P-1100 prescriptive retrofit design provides a large increase in strength, stiffness, energy dissipation, and in many cases also increases drift capacity of older, vulnerable cripple walls.
Quasi-Static Reversed Cyclic Testing of Pre-1960 Wood Cripple Walls with Stucco Exterior Finishes: Evaluating the Impact of Retrofit
Quantifying the performance of retrofitted and un-retrofitted single-family wood-frame dwellings has become increasingly important in California due to the high seismicity of the state and the poor seismic resiliency of some portions of the housing stock. From field observations of past earthquakes, it has been found that inadequate lateral bracing of cripple walls and inadequate sill bolting are the primary reasons for failures of residential dwellings even in the event of moderate earthquakes. While methods to retrofit weak cripple walls and improve sill anchorage have been developed, the performance benefits of these changes have not been experimentally quantified. In addition, little knowledge is available to quantify the performance of existing dwellings. To address this limitation, a multi-university experimental investigation was undertaken as part of a collaborative PEER project funded by the CEA, with the ultimate goal of supporting numerical model validation and ultimately loss modeling of older residential dwellings. Particular emphasis was given to characterizing the performance of cripple walls retrofit using the recently published FEMA P-1100 guidelines: Vulnerability-Based Seismic Assessment and Retrofit of One- And Two-Family Dwellings. This paper focuses on presenting select test results from cripple wall component specimens tested under reversed cyclic quasi-static loading. Results in the present paper emphasize comparison amongst like existing and retrofit specimens with stucco and stucco over sheathing exterior finishes. Overall, results from these tests indicate that the FEMA P-1100 prescriptive retrofit design provides a large increase in strength, stiffness, energy dissipation, and in many cases also increases drift capacity of older, vulnerable cripple walls.
Quasi-Static Reversed Cyclic Testing of Pre-1960 Wood Cripple Walls with Stucco Exterior Finishes: Evaluating the Impact of Retrofit
Schiller, Brandon (author) / Hutchinson, Tara (author) / Cobeen, Kelly (author)
Structures Congress 2020 ; 2020 ; St. Louis, Missouri (Conference Cancelled)
Structures Congress 2020 ; 613-628
2020-04-02
Conference paper
Electronic Resource
English
| British Library Conference Proceedings | 2020
Quasi-Static Reversed Cyclic Response of Level and Stepped Cripple Walls
| British Library Online Contents | 2003
Quasi-Static Reversed Cyclic Response of Level and Stepped Cripple Walls
| Online Contents | 2003
Engineering Index Backfile | 1924