Lateral force distributions for the linear static analysis of base-isolated buildings |
| |
| Authors: | Donatello Cardone Mauro Dolce Giuseppe Gesualdi |
| |
| Institution: | (1) DiSGG, University of Basilicata, Potenza, Italy;(2) Italian Department of Civil Protection, Rome, Italy |
| |
| Abstract: | This paper presents a new approach for the evaluation of accurate lateral force distributions for the Linear Static Analysis
(LSA) of Base Isolated (BI-) buildings. In essence, the proposed lateral force distributions depend on a factor measuring
the degree of non- linearity of the Isolation System (IS) and on the ratio between the effective period of the BI-structure
(Tis) and the fundamental period of the Fixed Based (FB-) structure (Tfb). The proposed approach is fully compatible with the Direct Displacement-Based Design (DDBD) method, recently developed by
Priestley and co-workers. The proposed lateral force distributions have been derived from the results of a large number of
Nonlinear Time-History Analyses (NTHA), carried out on six numerical models of multi-storey buildings, differing in storey
number (3, 5 and 8, respectively) and fundamental period of vibration (from 0.25 to 0.8 s) in the fixed-base configuration.
A great variety of Isolation Systems (ISs), characterised by either Elasto-Plastic with Hardening (EPH) or Flag-Shaped (FS)
force-displacement behaviour, have been considered in the NTHA. The numerical parameters of the IS models have been varied
in such a way as to reproduce the actual mechanical behaviour of the main currently used ISs, including: (i) Lead Rubber Bearings
(LRB), (ii) High-Damping Rubber Bearings (HDRB), (iii) Friction Pendulum Bearings (FPB), (iv) combinations of flat Sliding
Bearings (SB) and Low-Damping Rubber Bearings (LDRB) and (v) Combinations of flat SB and re-centring devices based on Shape
Memory Alloys (SMA). Comparisons between the storey shear forces derived with the proposed method and those obtained from
NTHA clearly show the great improvements in the accuracy of LSA predictions, when using the proposed lateral force distributions. |
| |
| Keywords: | Base-isolated buildings Direct displacement-based design Linear static analysis Lead rubber bearings Friction pendulum systems Flag shaped isolation systems |
| 本文献已被 SpringerLink 等数据库收录！ |
|
