Seismic Design of Wood and Masonry Buildings

2001 ◽  
pp. 563-621
Author(s):  
John G. Shipp ◽  
Gary C. Hart
Keyword(s):  
Seismic Design ◽  
Masonry Buildings

Investigation and Analysis on Seismic Damage of Masonry Buildings Subjected to Wenchuan Ms=8.0 Earthquake

2010 ◽  
Vol 452-453 ◽  
pp. 105-108 ◽  
Author(s):  
Hong Fu Chen ◽  
Bai Tao Sun
Keyword(s):  
Seismic Design ◽  
Concrete Slab ◽  
Seismic Damage ◽  
Impact Factors ◽  
Economic Losses ◽  
Masonry Building ◽  
Masonry Buildings ◽  
Seismic Design Code ◽  
The Impact ◽  
Wenchuan Ms 8.0 Earthquake

During Wenchuan Ms 8.0 earthquake, masonry buildings have suffered severely damaged and collapsed, causing heavy casualties and huge economic losses. In this paper, based on seismic site survey data, some new phenomena and characteristics of earthquake damage in comparison with the 1976 Tangshan earthquake, such as seismic damage of large space buildings, inclined or “X” shaped crack in wall between windows or spandrel wall, stair damage, falling of precast reinforced concrete slab and horizontal crack at the bottom of structure, are discussed in detail. Then, the impact factors of seismic capacity of masonry building in Wenchuan earthquake, including construction age, seismic fortification, bay size, floor (roof) form, layer number, thickness of bearing wall are analyzed, respectively; Finally, some recommendations on seismic design and reconstruction of masonry structure by the seismic design code are proposed.

scholarly journals Simplified Seismic Assessment of Unreinforced Masonry Residential Buildings in the Balkans: The Case of Serbia

Buildings ◽  
2021 ◽  
Vol 11 (9) ◽  
pp. 392
Author(s):  
Predrag Blagojević ◽  
Svetlana Brzev ◽  
Radovan Cvetković
Keyword(s):  
Seismic Design ◽  
Residential Buildings ◽  
Unreinforced Masonry ◽  
Seismic Assessment ◽  
Eurocode 8 ◽  
Masonry Buildings ◽  
Seismic Evaluation ◽  
Wall Area ◽  
The Balkans ◽  
Minimum Requirements

The paper presents a study on the existing low-rise unreinforced masonry (URM) buildings constructed in the period from 1945 to 1980 in Serbia and neighbouring countries in the Balkans. Buildings of this typology experienced damage in a few earthquakes in the region, including the 2010 Kraljevo, Serbia earthquake and the 2020 Petrinja, Croatia earthquake. The focus of the study is a seismic design approach for Simple masonry buildings according to Eurocode 8, Part 1, which is based on the minimum requirements for the total wall area relative to the floor plan area, which is referred to as Wall Index (WI) in this paper. Although the intention of Eurocode 8 is to use WI for design of new buildings, the authors believe that it could be also used for seismic assessment of existing masonry buildings in pre- and post-earthquake situations. A study on 23 URM buildings damaged in the 2010 Kraljevo, Serbia earthquake has been presented to examine a relationship between the WI and the extent of earthquake damage. Seismic evaluation of a typical 3-storey URM building damaged in the 2010 earthquake was performed according to the requirements of seismic design codes from the former Yugoslavia and Eurocode 8.

scholarly journals Latest Findings on the Behaviour Factor q for the Seismic Design of URM Buildings

2021 ◽  
Author(s):  
Paolo Morandi ◽  
Christoph Butenweg ◽  
Khaled Breis ◽  
Katrin Beyer ◽  
Guido Magenes
Keyword(s):  
Seismic Design ◽  
Structural Damage ◽  
Design Method ◽  
Masonry Buildings ◽  
Behaviour Factor ◽  
Emilia Earthquake ◽  
Standard Design ◽  
Seismic Design Method ◽  
Recent Earthquakes ◽  
2012 Emilia Earthquake

Abstract Recent earthquakes as the 2012 Emilia earthquake sequence showed that recently built unreinforced masonry (URM) buildings behaved much better than expected and sustained, despite the maximum PGA values ranged between 0.20 - 0.30g, either minor damage or structural damage that is deemed repairable. Especially low-rise residential and commercial masonry buildings with a code-conforming seismic design and detailing behaved in general very well without substantial damages. The low damage grades of modern masonry buildings that was observed during this earthquake series highlighted again that codified design procedures based on linear analysis can be rather conservative. Although advances in simulation tools make nonlinear calculation methods more readily accessible to designers, linear analyses will still be the standard design method for years to come. The present paper aims to improve the linear seismic design method by providing a proper definition of the q-factor of URM buildings. These q-factors are derived for low-rise URM buildings with rigid diaphragms which represent recent construction practise in low to moderate seismic areas of Italy and Germany. The behaviour factor components for deformation and energy dissipation capacity and for overstrength due to the redistribution of forces are derived by means of pushover analyses. Furthermore, considerations on the behaviour factor component due to other sources of overstrength in masonry buildings are presented. As a result of the investigations, rationally based values of the behaviour factor q to be used in linear analyses in the range of 2.0 to 3.0 are proposed.

scholarly journals Seismic Design of Box-Type Unreinforced Masonry Buildings Through Direct Displacement-Based Approach

2016 ◽  
Vol 10 (1) ◽  
pp. 293-311 ◽  
Author(s):  
Fulvio Parisi
Keyword(s):  
Seismic Design ◽  
Failure Modes ◽  
Unreinforced Masonry ◽  
Masonry Building ◽  
Masonry Buildings ◽  
Construction Costs ◽  
Plane Failure ◽  
Accidental Eccentricity ◽  
Reinforced Concrete Slabs ◽  
Displacement Based

In the last decade, displacement-based seismic design procedures have been recognised to be effective alternatives to force-based design (FBD) methods. Indeed, displacement based design (DBD) may allow the structural engineer to get more realistic predictions of local and global deformations of the structure, and hence damage, under design earthquakes. This facilitates the achievement of performance objectives and loss mitigation in the lifetime of the structure. Nonetheless, DBD needs further investigation for some structural types such as masonry buildings. In this paper, a direct displacement based design (DDBD) procedure for unreinforced masonry (URM) buildings is presented and critically compared to FBD. The procedure is proposed for box-type URM buildings with reinforced concrete slabs, bond beams and lintels above openings, which have shown acceptable seismic performance in severe earthquakes preventing out-of-plane failure modes. Seismic design of a three storey brick masonry building in a high seismicity region is discussed as a case study. The effects of ordinary and near-field design earthquakes, as well as load combinations and accidental eccentricity prescribed by current codes, were investigated. Finally, design solutions provided by FBD and DDBD were optimised and their construction costs were estimated. It was found that, particularly at small epicentral distances, neglecting the combination of horizontal seismic actions and accidental eccentricity may induce significant underestimation and an ideally more uniform distribution of strength demands on URM walls. In addition, construction costs resulting from DDBD may be significantly lower than those related to code based FBD procedures.

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