Seismic protection of historical structures and monuments

This study addresses an alternative use of viscous dampers (VDs) associated with buckling restrained braces (BRBs) as innovative seismic protection devices. For this purpose, 4-, 8- and 12-story steel bare frames were designed with 6.5 m equal span length and 4 m story height. Thereafter, they were seismically improved by mounting the VDs and BRBs in three patterns, namely outer bays, inner bays, and all bays over the frame heights. The structures were modeled using SAP 2000 software and evaluated by the nonlinear time history analyses subjected to the six natural ground motions. The seismic responses of the structures were investigated for the lateral displacement, interstory drift, absolute acceleration, maximum base shear, and time history of roof displacement. The results clearly indicated that the VDs and BRBs reduced seismic demands significantly compared to the bare frame. Moreover, the all-bay pattern performed better than the others.

Experimental Evaluation of Shear Behavior of Stone Masonry Wall

Materials ◽

10.3390/ma14092313 ◽

2021 ◽

Vol 14 (9) ◽

pp. 2313

Author(s):

Maria Luisa Beconcini ◽

Pietro Croce ◽

Paolo Formichi ◽

Filippo Landi ◽

Benedetta Puccini

Keyword(s):

Shear Behavior ◽

Stone Masonry ◽

Masonry Walls ◽

Mechanical Parameters ◽

In Situ Tests ◽

Capacity Curves ◽

Historical Structures ◽

Definition Of

The evaluation of the shear behavior of masonry walls is a first fundamental step for the assessment of existing masonry structures in seismic zones. However, due to the complexity of modelling experimental behavior and the wide variety of masonry types characterizing historical structures, the definition of masonry’s mechanical behavior is still a critical issue. Since the possibility to perform in situ tests is very limited and often conflicting with the needs of preservation, the characterization of shear masonry behavior is generally based on reference values of mechanical properties provided in modern structural codes for recurrent masonry categories. In the paper, a combined test procedure for the experimental characterization of masonry mechanical parameters and the assessment of the shear behavior of masonry walls is presented together with the experimental results obtained on three stone masonry walls. The procedure consists of a combination of three different in situ tests to be performed on the investigated wall. First, a single flat jack test is executed to derive the normal compressive stress acting on the wall. Then a double flat jack test is carried out to estimate the elastic modulus. Finally, the proposed shear test is performed to derive the capacity curve and to estimate the shear modulus and the shear strength. The first results obtained in the experimental campaign carried out by the authors confirm the capability of the proposed methodology to assess the masonry mechanical parameters, reducing the uncertainty affecting the definition of capacity curves of walls and consequently the evaluation of seismic vulnerability of the investigated buildings.

Optimal finite locally resonant metafoundations enhanced with nonlinear negative stiffness elements for seismic protection of large storage tanks

Journal of Sound and Vibration ◽

10.1016/j.jsv.2020.115488 ◽

2020 ◽

Vol 483 ◽

pp. 115488

Author(s):

Moritz Wenzel ◽

Oreste S. Bursi ◽

Ioannis Antoniadis

Keyword(s):

Negative Stiffness ◽

Seismic Protection ◽

Storage Tanks

A Theoretical Study on Piezoelectric Smart Isolation System for Seismic Protection of Equipment in Near-fault Areas

Journal of Intelligent Material Systems and Structures ◽

10.1177/1045389x08091120 ◽

2008 ◽

Vol 20 (2) ◽

pp. 217-232 ◽

Cited By ~ 29

Author(s):

Lyan-Ywan Lu ◽

Ging-Long Lin

Keyword(s):

Theoretical Study ◽

Seismic Protection ◽

Isolation System ◽

Near Fault

Performance Assessment of a Highway Bridge Structure employing Adaptive Negative Stiffness for Seismic Protection

Structures Congress 2013 ◽

10.1061/9780784412848.152 ◽

2013 ◽

Cited By ~ 3

Author(s):

N. Attary ◽

M. Symans ◽

S. Nagarajaiah ◽

A. M. Reinhorn ◽

M. C. Constantinou ◽

...

Keyword(s):

Performance Assessment ◽

Negative Stiffness ◽

Seismic Protection ◽

Highway Bridge ◽

Bridge Structure