Response of low-rise frame structures to dynamic soil motions /
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| Other Authors: | , , |
| Format: | Thesis Book |
| Language: | English |
| Published: |
1990.
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| Subjects: | |
| Online Access: | ProQuest, Abstract Link to OAKTrust copy |
| Abstract: | The major objective of this study was to develop a simplified model to simulate the response of low-rise structures subjected to dynamic loads. This model incorporates the influence of soil and floor flexibility and is based upon underlying assumptions of static portal frame analysis. Ultimately, this study was extended to incorporate mono-symmetric structures (with and without setback) subject to self-induced torsion, as well as asymmetric frames. This model provides estimates of any desired force or displacement which might be determined in a corresponding space frame model. For selected design parameters, including maximum base shear and torque, maximum horizontal roof deflection, and maximum beam forces (shear, moment, and torque), the average errors for all comparisons to space frame calculations were less than ten percent. Prior to development of the simplified model, preliminary studies assessed the impact of linear soil-structure interaction effects (SSI) upon the response of space frames with flexible mat foundations and composite beam/slab floor systems. An extensive parameter study of representative space frames was conducted, in which response of the frames supported on a modest soil volume of finite elements was used to determine an effective distribution of equivalent soil springs. With the equivalent soil spring distribution in place, each frame was then subjected to one or more earthquake loads using modal analysis and appropriate mode combination techniques. Investigation of flexible mat foundations was limited to frames loaded in the direction of a horizontal axis of symmetry. Accuracy of the space frame parameter study model was compared to published analytical results and found to be sufficiently accurate to support the following broad conclusions. Within the limits of linear analysis of uniformly applied horizontal soil loads, mat flexibility is significant only to the response of the mat foundation of the structure. Structure forces and displacements above the mat are only slightly affected by soil and mat flexibility. This preliminary study provided baseline space frame calculations for comparisons with the simplified model. |
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| Item Description: | Typescript (photocopy). Vita. "Major subject: Civil engineering." |
| Physical Description: | xvii, 254 leaves : illustrations ; 29 cm |
| Bibliography: | Includes bibliographical references. |