research

EXPERIMENTAL EARTHQUAKE RESPONSE OF TWO-STOREY SCALED URM BUILDINGS    11th International Conference on Structural Analysis of Historical Constructions (2018) - Cusco, Peru   Realistic earthquake simulation response of a retrofitted two-storey brick masonry building. Retrofit: moment-resisting frames at the ground floor, and timber strong-backs with shear walls and wall-to-floor7roof anchors at the top floor.

EXPERIMENTAL EARTHQUAKE RESPONSE OF TWO-STOREY SCALED URM BUILDINGS

11th International Conference on Structural Analysis of Historical Constructions (2018) - Cusco, Peru

Realistic earthquake simulation response of a retrofitted two-storey brick masonry building. Retrofit: moment-resisting frames at the ground floor, and timber strong-backs with shear walls and wall-to-floor7roof anchors at the top floor.

SEISMIC RETROFIT OF MASONRY WALLS USING TIMBER STRONG-BACKS    Structural Engineering Society Journal (2017), 30(2), 30–44   Development and validation of the timber strong-back solution as a simple and cost-effective seismic retrofit for masonry solid- and cavity-walls that consider the impact on the building tenants and aesthetics. Includes design tips.

SEISMIC RETROFIT OF MASONRY WALLS USING TIMBER STRONG-BACKS

Structural Engineering Society Journal (2017), 30(2), 30–44

Development and validation of the timber strong-back solution as a simple and cost-effective seismic retrofit for masonry solid- and cavity-walls that consider the impact on the building tenants and aesthetics. Includes design tips.

URM WALL-TO-DIAPHRAGM AND TIMBER JOIST CONNECTION TESTING   10th International Masonry Conference (2018) - Milan, Italy  Field testing of wall-to-floor/roof connection including 8 tests on original plate anchor connections and 9 tests on different configurations of timber blockings.

URM WALL-TO-DIAPHRAGM AND TIMBER JOIST CONNECTION TESTING

10th International Masonry Conference (2018) - Milan, Italy

Field testing of wall-to-floor/roof connection including 8 tests on original plate anchor connections and 9 tests on different configurations of timber blockings.

SECURING SOLUTIONS FOR FACE-LOADED CLAY BRICK URM WALLS    13th Canadian Masonry Symposium (2017) - Halifax, Canada   Shake-table testing of 3 full-scale double-leaf solid clay brick masonry walls with parapet retrofitted with timber strong-backs or post-tensioning.

SECURING SOLUTIONS FOR FACE-LOADED CLAY BRICK URM WALLS

13th Canadian Masonry Symposium (2017) - Halifax, Canada

Shake-table testing of 3 full-scale double-leaf solid clay brick masonry walls with parapet retrofitted with timber strong-backs or post-tensioning.

EFFECT OF BOUNDARY CONDITIONS AND OTHER FACTORS ON URM WALL OUT-OF-PLANE BEHAVIOUR: DESIGN DEMANDS, PREDICTED CAPACITY, AND IN SITU PROOF TEST RESULTS    Structural Engineering Society Journal (2017), 30(1), 57-81   19 air-bag tests performed on 6 buildings to investigate out-of-plane masonry wall capacity. Different wall configurations included a variety of geometries, boundary conditions, pre-test damage states, material properties, and retrofit techniques.

EFFECT OF BOUNDARY CONDITIONS AND OTHER FACTORS ON URM WALL OUT-OF-PLANE BEHAVIOUR: DESIGN DEMANDS, PREDICTED CAPACITY, AND IN SITU PROOF TEST RESULTS

Structural Engineering Society Journal (2017), 30(1), 57-81

19 air-bag tests performed on 6 buildings to investigate out-of-plane masonry wall capacity. Different wall configurations included a variety of geometries, boundary conditions, pre-test damage states, material properties, and retrofit techniques.

SHAKING TABLE TESTING OF AS-BUILT AND RETROFITTED CLAY BRICK URM CAVITY-WALLS    Engineering Structures (2016), 125, 70–79   Investigating the performance of 5 full-scale brick cavity-wall retrofitted with mechanical screw-ties or with timber strong-backs. Spacing of the mechanical screw-ties was one of the variabilities explored.

SHAKING TABLE TESTING OF AS-BUILT AND RETROFITTED CLAY BRICK URM CAVITY-WALLS

Engineering Structures (2016), 125, 70–79

Investigating the performance of 5 full-scale brick cavity-wall retrofitted with mechanical screw-ties or with timber strong-backs. Spacing of the mechanical screw-ties was one of the variabilities explored.

OUT-OF-PLANE PROOF TESTING OF MASONRY INFILL WALLS   Structures (2018), 15, 244-258  Two-way out-of-plane flexure, boundary restraints and presumed ‘arching’ action from the building frame substantially improved the out-of-plane load-carrying capacity of tested infill walls compared to one-way vertical out-of-plane flexure. The effects of simulated in-plane damage on the out-of-plane capacity were also investigated.

OUT-OF-PLANE PROOF TESTING OF MASONRY INFILL WALLS

Structures (2018), 15, 244-258

Two-way out-of-plane flexure, boundary restraints and presumed ‘arching’ action from the building frame substantially improved the out-of-plane load-carrying capacity of tested infill walls compared to one-way vertical out-of-plane flexure. The effects of simulated in-plane damage on the out-of-plane capacity were also investigated.

SHAKE TABLE TESTING OF SEISMICALLY RESTRAINED CLAY BRICK MASONRY PARAPETS    Earthquake Spectra (2018), 34(1), 99–119   Dynamic behaviour of 9 brick masonry parapets retrofitted with commonly used bracing systems and alternative securing techniques such as post-tensioning and the combined use of braces and strong-backs.

SHAKE TABLE TESTING OF SEISMICALLY RESTRAINED CLAY BRICK MASONRY PARAPETS

Earthquake Spectra (2018), 34(1), 99–119

Dynamic behaviour of 9 brick masonry parapets retrofitted with commonly used bracing systems and alternative securing techniques such as post-tensioning and the combined use of braces and strong-backs.

CONSTRUCTION DETAILS AND OBSERVED EARTHQUAKE PERFORMANCE OF UNREINFORCED CLAY BRICK MASONRY CAVITY-WALLS   Structures (2016), 6, 159–169  252 cavity-walls damaged during the 2010/2011 Canterbury earthquakes were used to study the most commonly-encountered construction details and to identify typical deficiencies in earthquake response to be addressed via appropriate retrofit interventions.

CONSTRUCTION DETAILS AND OBSERVED EARTHQUAKE PERFORMANCE OF UNREINFORCED CLAY BRICK MASONRY CAVITY-WALLS

Structures (2016), 6, 159–169

252 cavity-walls damaged during the 2010/2011 Canterbury earthquakes were used to study the most commonly-encountered construction details and to identify typical deficiencies in earthquake response to be addressed via appropriate retrofit interventions.

PULL-OUT BEHAVIOR OF ADHESIVE CONNECTIONS IN URM WALLS   Earthquake Spectra (2016), 32(4)  Almost 400 adhesive anchor tests conducted in 11 masonry buildings located in Christchurch, Whanganui and Auckland. The scope was to identify failure modes and the influence of: adhesive type, strength of the masonry, anchor embedment depth, anchor rod diameter, overburden level, anchor rod type, quality of installation, and the use of metal mesh sleeves.

PULL-OUT BEHAVIOR OF ADHESIVE CONNECTIONS IN URM WALLS

Earthquake Spectra (2016), 32(4)

Almost 400 adhesive anchor tests conducted in 11 masonry buildings located in Christchurch, Whanganui and Auckland. The scope was to identify failure modes and the influence of: adhesive type, strength of the masonry, anchor embedment depth, anchor rod diameter, overburden level, anchor rod type, quality of installation, and the use of metal mesh sleeves.

PERFORMANCE OF ADHESIVE WALL-TO-DIAPHRAGM CONNECTIONS IN THE CANTERBURY EARTHQUAKES AND THE SUBSEQUENT EXPERIMENTAL PULL-OUT TEST PROGRAM   12th Canadian Masonry Symposium (2013) - Vancouver, Canada  Field observations of masonry buildings following the 2010/2011 Canterbury earthquakes revealed numerous cases where wall-to-floor/roof anchor connections failed prematurely. These observations were more frequent for adhesive anchor connections than for through-bolt connections.

PERFORMANCE OF ADHESIVE WALL-TO-DIAPHRAGM CONNECTIONS IN THE CANTERBURY EARTHQUAKES AND THE SUBSEQUENT EXPERIMENTAL PULL-OUT TEST PROGRAM

12th Canadian Masonry Symposium (2013) - Vancouver, Canada

Field observations of masonry buildings following the 2010/2011 Canterbury earthquakes revealed numerous cases where wall-to-floor/roof anchor connections failed prematurely. These observations were more frequent for adhesive anchor connections than for through-bolt connections.

IN-SITU TESTING OF WALL-TO-DIAPHRAGM SHEAR TRANSFERRING CONNECTIONS IN AN EXISTING CLAY BRICK URM BUILDING   9th International Masonry Conference (2014) - Guimarães, Portugal  22 on-site cyclic shear tests to study the effectiveness of adhesive anchors in transfering seismic shear from floor to walls. Studied parameters included: anchor rod diameter, embedment depth, timber blocking thickness, boundary conditions, washer size and axial pre-load of the anchor.

IN-SITU TESTING OF WALL-TO-DIAPHRAGM SHEAR TRANSFERRING CONNECTIONS IN AN EXISTING CLAY BRICK URM BUILDING

9th International Masonry Conference (2014) - Guimarães, Portugal

22 on-site cyclic shear tests to study the effectiveness of adhesive anchors in transfering seismic shear from floor to walls. Studied parameters included: anchor rod diameter, embedment depth, timber blocking thickness, boundary conditions, washer size and axial pre-load of the anchor.