Research/Scholarly/Creative Works

Journal Articles

• Brown JR., Li M., Palermo A., Pampanin S. and Sarti F. (2023) Analytical Modeling of Posttensioned C-Shaped CLT Core Walls. Journal of Structural Engineering (United States) 149(3) http://dx.doi.org/10.1061/JSENDH.STENG-11455.

• Chen F., He M., Li M., Liu J., Shu Z. and Li Z. (2023) Recovery testing of self-centering steel-timber hybrid beam-column connections. Construction and Building Materials 365 http://dx.doi.org/10.1016/j.conbuildmat.2022.130067.

• Krauss K., Li M. and Lam F. (2023) Influence of mixed-angle screw installations in CLT on the cyclic performance of commercial hold-down connections. Construction and Building Materials 364 http://dx.doi.org/10.1016/j.conbuildmat.2022.129918.

• Li Z., Chen F., He M., Long W., Ou J. and Li M. (2023) Experimental Investigation on Self-Centering Steel-Timber Hybrid Beam-Column Connections. Journal of Structural Engineering (United States) 149(3) http://dx.doi.org/10.1061/JSENDH.STENG-11570.

• Brown J., Li M., Palermo A., Pampanin S., Sarti F. and Nokes R. (2022) Experimental Testing and Analytical Modelling of Single and Double Post-Tensioned CLT Shear Walls. Engineering Structures 256 114065 http://dx.doi.org/10.1016/j.engstruct.2022.114065.

• Dong W., Li M., Sullivan T., MacRae G., Lee C. and Chang T. (2022) Direct displacement-based seismic design of glulam frames with buckling restrained braces. Journal of Earthquake Engineering http://dx.doi.org/10.1080/13632469.2022.2110999.

• Ma Z., Li M., Liu A., Wang J., Zhou L. and Dong W. (2022) Seismic performance of single-storey light timber-framed buildings braced by gypsum plasterboards considering rigidity of ceiling diaphragms. Structures (41): 1207-1219. http://dx.doi.org/10.1016/j.istruc.2022.05.076.

• Moerman B., Li M., Palermo A. and Liu A. (2022) Moment-resisting self-drilling dowel connections between steel link beams and CLT for coupled walls. Structures 41: 365-374. http://dx.doi.org/10.1016/j.istruc.2022.05.017.

• Moerman B., Li M., Smith T. and Lim H. (2022) Design and cyclic testing of bolted end plate connections between steel link beams and cross-laminated timber for coupled shear walls. Construction and Building Materials 353 http://dx.doi.org/10.1016/j.conbuildmat.2022.129060.

• Srivaro S., Lim H., Li M. and Altaner C. (2022) Effect of pressing parameters on dimensional stability and bonding performance of thermally compressed coconut wood. Construction and Building Materials 357 http://dx.doi.org/10.1016/j.conbuildmat.2022.129359.

• Srivaro S., Lim H., Li M. and Pasztory Z. (2022) Properties of Mixed Species/Densities Cross Laminated Timber made of Rubberwood and Coconut Wood. Structures 40(3): 237-246. http://dx.doi.org/10.1016/j.istruc.2022.04.016.

• Brown J., Li M. and Sarti F. (2021) Structural Performance of CLT Shear Connections with Castellations and Angle Brackets. Engineering Structures 240 112346 http://dx.doi.org/10.1016/j.engstruct.2021.112346.

• Brown J., Li M., Palermo A., Pampanin S. and Sarti F. (2021) Experimental Testing of a Low-Damage Post-Tensioned C-shaped CLT Core-Wall. Journal of Structural Engineering 147(3) http://dx.doi.org/10.1061/(asce)st.1943-541x.0002926.

• Dong W., Li M., He M. and Li Z. (2021) Experimental testing and analytical modelling of glulam moment connections with self-drilling dowels. Journal of Structural Engineering 147(5) 04021047 http://dx.doi.org/10.1061/(ASCE)ST.1943-541X.0002977.

• Dong W., Li M., Lee C-L. and MacRae G. (2021) Numerical modelling of glulam frames with buckling restrained braces. Engineering Structures 239 112338 http://dx.doi.org/10.1016/j.engstruct.2021.112338.

• Li Z., Wang X., He M., Ou J., Li M., Luo Q. and Dong H. (2021) Structural damage evaluation of multi-story timber-steel hybrid structures through shake table tests. Journal of Performance of Constructed Facilities 35(1) 04020139 http://dx.doi.org/10.1061/(ASCE)CF.1943-5509.0001555.

• Moerman B., Li M., Cao Y. and Lim H. (2021) Compressive behaviour of hardwood dowel reinforced CLT loaded perpendicular-to-grain. Construction and Building Materials 302 124137 http://dx.doi.org/10.1016/j.conbuildmat.2021.124137.

• Srivaro S., Lim H., Li M., Jantawee S. and Tomad J. (2021) Effect of compression ratios and original wood density on pressing characteristics and physical and mechanical properties of thermally compressed coconut wood. Construction and Building Materials 299 124272 http://dx.doi.org/10.1016/j.conbuildmat.2021.124272.

• Brown J. and Li M. (2020) Structural Performance of Dowelled Cross-Laminated Timber Hold-Down Connections with Increased Row Spacing and End Distance. Construction and Building Materials http://dx.doi.org/10.1016/j.conbuildmat.2020.121595.

• Brown J., Li M., Karalus B. and Stanton S. (2020) Withdrawal Behaviour of Self-tapping Screws in New Zealand Cross-Laminated Timber. New Zealand Timber Design Journal 28(2): 25-32.

• Brown J., Li M., Tannert T. and Moroder D. (2020) Experimental Study on Orthogonal Joints in Cross-Laminated Timber with Self-Tapping Screws installed with Mixed Angles. Engineering Structures http://dx.doi.org/10.1016/j.engstruct.2020.111560.

• Dong W., Li M., Lee C-L., MacRae G. and Abu A. (2020) Experimental testing of full-scale glulam frames with buckling restrained braces. Engineering Structures 222 111081 http://dx.doi.org/10.1016/j.engstruct.2020.111081.

• Dong W., Li M., Ottenhaus L-M. and Lim H. (2020) Ductility and overstrength of nailed CLT hold-down connections. Engineering Structures 215 110667 http://dx.doi.org/10.1016/j.engstruct.2020.110667.

• Li Z., Chen F., Dong H., He M. and Li M. (2020) Lateral performance of timber-steel hybrid shear wall with friction dampers under cyclic loading (in Chinese). Jianzhu Jiegou Xuebao/Journal of Building Structures 41(10): 1-10.

• Lim H., Tripathi S. and Li M. (2020) Rolling shear modulus and strength of cross-laminated timber treated with micronized copper azole type C (MCA-C). Construction and Building Materials 259 120419 http://dx.doi.org/10.1016/j.conbuildmat.2020.120419.

• Liu J., Lam F., Foschi RO. and Li M. (2020) Modeling the coupling effect of CLT connections under bi-axial loading. Journal of Structural Engineering 146(4) 04020040 http://dx.doi.org/10.1061/(ASCE)ST.1943-541X.0002589.

• Ottenhaus L-M., Li M. and Smith T. (2020) Analytical derivation and experimental verification of overstrength factors of dowel-type timber connections for capacity design. Journal of Earthquake Engineering http://dx.doi.org/10.1080/13632469.2020.1781711.

• Cao Y., Street J., Li M. and Lim H. (2019) Evaluation of the effect of knots on rolling shear strength of cross laminated timber (CLT). Construction and Building Materials 222: 579-587. http://dx.doi.org/10.1016/j.conbuildmat.2019.06.165.

• Dong W., Li M., Kho D., He M. and Li Z. (2019) Seismic performance evaluation of steel moment frames infilled with plywood shear walls. New Zealand Timber Design Journal 27(4): 21-28.

• He M., Luo Q., Dong H., Li Z. and Li M. (2019) Experimental study on seismic performance of steel frame and light timber-frame shear wall hybrid structure through shake table tests (in Chinese). Jianzhu Jiegou Xuebao/Journal of Building Structures 40(9): 1-9. http://dx.doi.org/10.14006/j.jzjgxb.2017.0748.

• Kho D., Li M. and Lee C-L. (2019) Behaviour of nailed timber-plywood connections under monotonic and cyclic loading. New Zealand Timber Design Journal 27(2): 15-26.

• Li M., Dong W. and Lim H. (2019) Influence of lamination aspect ratios and test methods on rolling shear strength evaluation of cross laminated timber. ASCE Journal of Materials in Civil Engineering 31(12) 04019310 http://dx.doi.org/10.1061/(ASCE)MT.1943-5533.0002977.

• Li M., Liu A. and Dong W. (2019) Progress in seismic research of wood structures in New Zealand. Construction Science and Technology 391: 25-30. http://dx.doi.org/10.16116/j.cnki.jskj.2019.17.003.

• Liu A., Li M. and Shelton R. (2019) Experimental studies on in-plane performance of plasterboard sheathed ceiling diaphragms. Bulletin of the New Zealand Society for Earthquake Engineering 52(2): 95-106.

• Ottenhaus L-M., Li M., Nokes R., Cammock P. and McInnes B. (2019) Use of particle tracking velocimetry in timber material and connection testing. European Journal of Wood and Wood Products 77(2): 195-209. http://dx.doi.org/10.1007/s00107-018-1376-y.

• He M., Luo Q., Li Z., Dong H. and Li M. (2018) Seismic performance evaluation of timber-steel hybrid structure through large-scale shaking table tests. Engineering Structures 175: 483-500. http://dx.doi.org/10.1016/j.engstruct.2018.08.029.

• Li Z., He M., Wang X. and Li M. (2018) Seismic performance assessment of steel frame infilled with prefabricated wood shear walls. Journal of Constructional Steel Research 140: 62-73. http://dx.doi.org/10.1016/j.jcsr.2017.10.012.

• Li Z., Zhou R., He M. and Li M. (2018) A state-of-the-art review on earthquake resilient timber structures (in Chinese). Jianzhu Jiegou Xuebao/Journal of Building Structures 39(9): 10-21. http://dx.doi.org/10.14006/J.JZJGXB.2018.09.002.

• Mohammad M., Blass H., Salenikovich A., Ringhofer A., Line P., Rammer D., Smith T. and Li M. (2018) Design approaches for CLT connections. Wood and Fiber Science 50(Special Issue): 27-47. http://dx.doi.org/10.22382/wfs-2018-038.

• Ottenhaus L-M. and Li M. (2018) Embedment strength of New Zealand cross laminated timber. New Zealand Timber Design Journal 26(1): 12-16.

• Ottenhaus L-M., Li M. and Smith T. (2018) Structural performance of large-scale dowelled CLT connections under monotonic and cyclic loading. Engineering Structures 176: 41-48. http://dx.doi.org/10.1016/j.engstruct.2018.09.002.

• Ottenhaus L-M., Li M., Smith T. and Quenneville P. (2018) Mode Cross-Over and Ductility of Dowelled LVL and CLT Connections under Monotonic and Cyclic Loading. Journal of Structural Engineering 144(7) 04018074: 10. http://dx.doi.org/10.1061/(ASCE)ST.1943-541X.0002074.

• Ottenhaus LM., Li M., Smith T. and Quenneville P. (2018) Overstrength of dowelled clt connections under monotonic and cyclic loading. Bulletin of Earthquake Engineering 16(2): 753-773. http://dx.doi.org/10.1007/s10518-017-0221-8.

• Li M. (2017) Evaluating rolling shear strength properties of cross laminated timber by short-span bending tests and modified planar shear tests. Journal of Wood Science 63(4): 331-337. http://dx.doi.org/10.1007/s10086-017-1631-6.

• Li Z., He M., Lam F., Zhou R. and Li M. (2017) Seismic reliability evaluation of steel-timber hybrid shear wall systems. Earthquake and Structures 13(3): 289-297. http://dx.doi.org/10.12989/eas.2017.13.3.289.

• Lim H., Lam F., Foschi R. and Li M. (2017) Modelling load-displacement hysteresis relationship of a single-shear nail connection. Journal of Engineering Mechanics - ASCE 143(6) 04017015 http://dx.doi.org/10.1061/(ASCE)EM.1943-7889.0001204.

• Lam F., Li Y. and Li M. (2016) Torque loading tests on the rolling shear strength of cross-laminated timber. Journal of Wood Science 62(5): 407-415. http://dx.doi.org/10.1007/s10086-016-1567-2.

• Li Z., He M., Lam F. and Li M. (2015) Load-sharing mechanism in timber-steel hybrid shear wall systems. Frontiers of Structural and Civil Engineering 9(2): 203-214. http://dx.doi.org/10.1007/s11709-015-0293-y.

• Li Z., He M., Lam F., Li M., Ma R. and Ma Z. (2014) Finite element modeling and parametric analysis of timber-steel hybrid structures. The Structural Design of Tall and Special Buildings 23(14): 1045-1063.

• Li Z., He M., Li M. and Lam F. (2014) Damage assessment and performance-based seismic design of timber-steel hybrid shear wall systems. Earthquakes and Structures 7(1): 101-117. http://dx.doi.org/10.12989/eas.2014.7.1.101.

• Li M., Foschi RO. and Lam F. (2012) Modeling hysteretic behaviour of panel-sheathed wood shear walls with a protocol-independent nail connection algorithm. ASCE Journal of Structural Engineering 138(1): 99-108. http://dx.doi.org/10.1061/(ASCE)ST.1943-541X.0000438.

• Li M., Lam F., Foschi RO., Nakajima S. and Nakagawa T. (2012) Seismic performance of post-and-beam timber buildings I: model development and verification. Journal of Wood Science 58(1): 20-30. http://dx.doi.org/10.1007/s10086-011-1219-5.

• Li M., Lam F., Foschi RO., Nakajima S. and Nakagawa T. (2012) Seismic performance of post-and-beam timber buildings II: reliability evaluations. Journal of Wood Science 58(2): 135-143.

• Li M., Lam F., Yeh BJ., Skaggs T., Rammer D. and Wacker J. (2012) Modeling force transfer around openings in wood-frame shear walls. ASCE Journal of Structural Engineering 138(12): 1419-1426. http://dx.doi.org/10.1061/(ASCE)ST.1943-541X.0000592.

• Li M. and Lam F. (2009) Lateral performance of non-symmetric diagonal-braced wood shear walls. ASCE Journal of Structural Engineering 135(2): 178-186.

• Li M., Lam F. and Foschi RO. (2009) Seismic reliability analysis of diagonal-braced and structural-panel-sheathed wood shear walls. ASCE Journal of Structural Engineering 135(5): 587-596.

• Li M., Lam F. and Lee G. (2007) Structural assessment of trailer floor systems with aluminium frame and wood decking. International Journal of Heavy Vehicle Systems 14(2): 213-226.

• Li J., Jiang J. and Li M. (2001) Hazard analysis system of urban post-earthquake fire based on GIS. Acta Seismologica Sinica 14(4): 448-455. http://dx.doi.org/10.1007/s11589-001-0123-2.

Conference Contributions - Published

• Moerman B., Li M., Palermo A., Smith T. and Liu A. (2022) Force-based design and time history analysis of CLT shear walls with bolted hold-downs. In.

• Wright T., Li M., Gedyma M., Lim H., Moroder D. and Carradine D. (2022) Repair and reinstatement of Douglas-fir CLT hold-down connections using mixed angle self-tapping screws. In.

• Brown J., Li M., Palermo A., Pampanin S. and Sarti F. (2021) Bi-directional seismic testing of post-tensioned rocking CLT walls and core-walls. In World Conference on Timber Engineering 2021, WCTE 2021.

• Dong W., Li M., Lee CL., MacRae G. and Abu A. (2021) Critical connection behavior in BRB glulam frames under lateral loads. In World Conference on Timber Engineering 2021, WCTE 2021.

• Brown J., Li M., Nokes R., Palermo A., Pampanin S. and Sarti F. (2020) Investigating the compressive toe of post-tensioned CLT core-walls using particle tracking technology. In.

• Dong W., Li M., Lee C-L., MacRae G. and Abu A. (2020) Cyclic tests of glulam frames with buckling restrained braces. In Proceedings of the 17th World Conference on Earthquake Engineering.

• Dong W., Li M., Lee C-L., MacRae G. and Abu A. (2020) Cyclic tests of glulam frames with buckling restrained braces. In Proceedings of the 17th World Conference on Earthquake Engineering.

• Brown J., Li M., Ottenhaus L-M., Ravn C. and Scott B. (2019) Ductility of dowelled New Zealand Douglas-Fir CLT connections under monotonic and cyclic loading. In PCEE2019 Papers: 10.

• Dong W. and Li M. (2019) A preliminary study on cyclic behaviour of SFS dowelled connections in glulam frames. In PCEE2019 Papers: 10.

• Kho D., Dong W., Li M. and Lee C-L. (2018) Cyclic behaviour of timber-steel hybrid shear walls. In Proceedings of the New Zealand Society for Earthquake Engineering Annual Technical Conference (NZSEE 2018): 8.

• Morris H., Carradine D. and Li M. (2018) Full-scale static and dynamic testing of timber frame houses damaged in the Christchurch earthquakes. In Proceedings of the WCTE 2018 - World Conference on Timber Engineering.

• Ottenhaus L-M., Li M. and Nokes R. (2018) Application of Partical Tracking in Large Scale Timber Connection Testing. In Proceedings of the WCTE 2018 - World Conference on Timber Engineering.

• Ottenhaus L-M., Li M. and Smith T. (2018) Analytical Method to Derive Overstrength of Dowel-Type Connections. In INTER Proceedings 2018: 12.

• Ottenhaus L-M., Li M. and Smith T. (2018) Overstrength of large-scale dowelled connections in CLT. In Proceedings of the New Zealand Society for Earthquake Engineering Annual Technical Conference (NZSEE 2018).

• Ottenhaus L-M., Li M. and Smith T. (2017) Ductility of large-scale dowelled CLT connections under monotonic and cyclic loading. In Proceedings AEES 2017: 8.

• Ottenhaus LM., Li M., Smith T. and Quenneville P. (2016) Ductility and overstrength of dowelled LVL and CLT connections under cyclic loading. In WTCE 2016 Proceedings.

• Ottenhaus L-M., Li M., Smith T. and Quenneville P. (2016) Ductility of dowelled and nailed CLT and LVL connections under monotonic and cyclic loading. In Proceedings of the Australian Earthquake Engineering Society Conference 2016.

• Smith T., Sarti F., Granello G., Marshall J., Buckton-Wishart V., Li M., Palermo A. and Pampanin S. (2016) Long-term dynamic characteristics of a pres-lam structure. In Proceedings of the WCTE 2016 - World Conference on Timber Engineering.

• Lam F., Li Z., He M. and Li M. (2015) Comparison of two reliability assessment methods for the seismic performance of timber-steel hybrid structures. In Proceedings of the 12th International Conference on Applications of Statistics and Probability in Civil Engineering, ICASP 2015.

• Li M. and Lam F. (2015) Lateral Behaviour of Cross Laminated Timber Shear Walls under Reversed Cyclic Loads. In Proceeedings of the 10th Pacific Conference on Earthquake Engineering (PCEE).

• Morris HW., Beskhyroun S., Smith T., Li M. and Carradine D. (2015) In-situ lateral load test performance of Christchurch houses. In Proceedings of the 10th Pacific Conference on Earthquake Engineering (PCEE).

• Li M., Lam F. and Li Y. (2014) Evaluating rolling shear strength properties of cross laminated timber by torsional shear tests. In WCTE 2014 - World Conference on Timber Engineering, Proceedings.

• Li M., Li Y. and Lam F. (2014) Evaluating Rolling Shear Strength Properties of Cross Laminated Timber by Torsional Shear Tests and Bending Tests. In Proceedings of the WCTE 2014 - World Conference on Timber Engineering: 2.

• Li Y., Lam F., Li M. and Foschi R. (2014) Duration-of-load effect on the rolling shear strength of cross laminated timber: Duration-of-load tests and damage accumulation model. In WCTE 2014 - World Conference on Timber Engineering, Proceedings.

• Lim HS., Lam F. and Li M. (2014) Experimental Study on Nail Connection Performance of Strand-based Wood Composites. In Proceeedings of the 13th World Conference on Timber Engineering (WCTE 2014).

• Lam F., Li M., Foschi RO., Nakajima S. and Nakagawa T. (2011) Performance of timber buildings in earthquakes. In Applications of Statistics and Probability in Civil Engineering - Proceedings of the 11th International Conference on Applications of Statistics and Probability in Civil Engineering: 1319-1326. http://dx.doi.org/10.1201/b11332-199.

• Skaggs T., Yeh BJ., Lam F., Li M., Rammer D. and Wacker J. (2011) Modelling force transfer around openings of full-scale shear walls. In Proceedings of the International Council for Research and Innovation in Building and Construction, Working Commission W18 - Timber Structures, Meeting Forty Four.

• Lam F., Li M., Foschi RO., Nakajima S., Kawai N., Minowa C., Okabe M., Yamaguchi N. and Nakagawa T. (2010) Seismic performance of post-and-beam timber buildings. In Proceedings of the 11th World Conference on Timber Engineering (WCTE 2010).

• Nakagawa T., Lam F., Barrett DJ., Foschi RO., Li M., Okabe M., Nakajima S., Kawai N., Yamaguchi N. and Minowa C. (2010) Shake table tests on a Three-story Post-and-beam Wood Building (Part II): numerical analysis of 3D framing models. In Proceedings of the 60th Annual Meeting of the Japan Wood Research Society.

• Okabe M., Lam F., Barrett DJ., Foschi RO., Li M., Nakajima S., Nakagawa T., Kawai N., Yamaguchi N. and Minowa C. (2010) Shake table tests on a Three-story Post-and-beam Wood Building (Part I): Experimental Results. In Proceedings of the 60th Annual Meeting of the Japan Wood Research Society.

• Lam F., Li M., Nakajima S. and Kawai N. (2008) Modeling 3-D response of Japanese post-and-beam structures. In Proceeedings of the 10th World Conference on Timber Engineering 2008.

• Li M. and Lam F. (2008) Modeling post-and-beam wood buildings under seismic loads. In Proceedings of 18th Analysis and Computation Speciality Conference - Structures Congress 2008: Crossing the Borders.

• Lam F., Li M. and Gu J. (2006) Structural performance of one storey Japanese post-and-beam building. In 9th World Conference on Timber Engineering 2006 (WCTE 2006).

Conference Contributions - Other

• Justin B., Li M., Palermo A., Pampanin S. and Sarti F. (2020) Investigating the Compressive Toe of Post-tensioned CLT Core-walls using Particle Tracking Technology. Christchurch: 8AESE - Advances in Experimental Structural Engineering, 3-5 Feb 2020.

• Li M. (2020) Seismic Testing of Innovative Lateral Load Resisting Systems in Mass Timber Structures. Christchurch, New Zealand: 8th International Conference on Advances in Experimental Structural Engineering, 3-5 Feb 2020.

• Brown J., Li M., Sarti F., Palermo A. and Pampanin S. (2019) Quasi-static cyclic testing of Post-Tensioned Timber Core-wall Systems. Brisbane, Queensland, Australia: 5th Pacific Timber Engineering Conference, 10-12 Jul 2019.

• Dong W., Li M., Lee C-L., MacRae G. and Abu A. (2019) Lateral Behavior of Glulam Frames with Buckling Restrained Braces (BRBs). Brisbane, Queensland, Australia: 5th Pacific Timber Engineering Conference, 10-12 Jul 2019.

• Dong W., Li M., Lee C-L., MacRae G. and Abu A. (2019) Lateral Behavior of Glulam Frames with Buckling Restrained Braces (BRBs). Brisbane, Queensland, Australia: 5th Pacific Timber Engineering Conference, 10-12 Jul 2019.

• Ottenhaus L. and Li M. (2019) Nailed hold-downs in the context of timber strength classes proposed in the revision of NZS/AS1720.1. Brisbane, Queensland, Australia: 5th Pacific Timber Engineering Conference, 10-12 Jul 2019.

Student Supervision

Displaying all items.

Current
• PhD - Gedyma M: Seismic performance of low-rise and mid-rise timber residential buildings with hybrid bracing solutions
• PhD - Krauss K: High performance CLT shear walls with flanges
• PhD - Moerman B: Performance of single and coupled CLT shear walls with high capacity hold-downs
• PhD - Wang K: Reducing seismic losses for New Zealand timber framed residential houses
• PhD - Wright T: High-performance screwed CLT hold-downs with mixed-angle installations
Completed
• PhD - Brown J: Seismic performance of timber core-wall systems and connections (2021)
• PhD - Dong W: Lateral performance of glulam frames with buckling restrained braces (BRBs) (2021)
• PhD - Ottenhaus L-M: Seismic performance of dowel-type connections in tall timber buildings (2019)
• Masters - Janssens S: Numerical modeling of dowelled connections in LVL and CLT under monotonic loading (2017)
• Masters - Kho D: Cyclic behavior of timber-steel hybrid shear walls (2018)