Quantitative Contribution of Timber Ring Beams in the Dynamic Response of Adobe Masonry Structures
Abstract
:1. Introduction
2. Behavior of Adobe Structures
3. Simulation of the Case Study
- Adobe bearing walls with no reinforcement. The assumption is made to model the response by considering a uniform configuration of the adobe bricks and the mortar;
- The walls are reinforced with ring beams made of wood. The assumption here is that the ring beams tie the walls together, maintaining their box-like behavior during an earthquake.
4. Results and Discussion
4.1. Modal Analysis—No Wooden Ring Beams
4.2. Modal Analysis—With Wooden Ring Beams
4.3. Comparison of Stress Results
4.3.1. In-Plane Stresses
4.3.2. Out-of-Plane Stresses
5. Conclusions
- The integration of ring beams augments the rigidity of the structure, resulting in a reduction in the fundamental period by approximately 6%. This intensifies the stresses, which is then predominantly redirected to the foundation level. Despite this increment at the foundation, it is typically fashioned from stone masonry, boasting superior resistance compared to the adobe walls. Conversely, the adobe walls, which inherently possess lower resistance, exhibit diminished stresses.
- During seismic events, ring beams play a crucial role in reinforcing the structural integrity of walls by effectively “binding” the components together. This integration helps to maintain the unity of the structure when subjected to lateral forces parallel to the walls. Additionally, ring beams serve to mitigate stress concentrations around openings such as doors and windows, leading to a more uniform distribution of seismic forces and thus enhancing the resilience of the structure to earthquake-induced stresses.
- In contrast, the efficacy of ring beams becomes negligible when the seismic direction is orthogonal to the walls, inducing out-of-plane stresses. Given that these beams are embedded within the wall, their performance becomes inconsequential in the out-of-plane direction, essentially moving in tandem with the entire wall without contributing significantly.
- Recognizing that seismic activities are unlikely to be perfectly aligned with a building’s primary axes, ring beams are subjected to both in-plane and out-of-plane stresses. Consequently, they play a pivotal role in the structure’s overall dynamic response in various seismic directions.
Author Contributions
Funding
Data Availability Statement
Conflicts of Interest
References
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Model 1 | Model 2 | |
---|---|---|
Mesh size | 20 cm | 20 cm |
No. of area elements | 179 | 179 |
No. of frame elements | 83 | 190 |
No. of nodes of each area element | 4 | 4 |
No. of joint restraints | 41 | 41 |
Property Type | Adobe | Rubble Stone | Cypress | Clay Tiles |
---|---|---|---|---|
Density (kg/m3) | 1300 | 1937 | 500 | 1400 |
Modulus of Elasticity (kNm−2) | 18,000 | 500,000 | 10,985,000 | 14,000,000 |
Poisson ratio, U | 0.30 | 0.14 | 0.18 | 0.20 |
Shear Modulus, G (kNm−2) | 6923 | 219,298 | 4,654,661 | 5,833,333 |
Condition | Period (Sec) | |
---|---|---|
Mode 1 | Mode 2 | |
Without Wooden Ring Beams | 0.37 | 0.33 |
With Wooden Ring Beams | 0.35 | 0.31 |
Reduction (%) | 5.5% | 6% |
Letter | Without TRB (kN/m2) | With TRB (kN/m2) | Letter | Without TRB (kN/m2) | With TRB (kN/m2) |
---|---|---|---|---|---|
A | 24 | 35 | N | −2.4 | 1.8 |
B | −2.9 | 0.7 | O | 19.35 | 18.31 |
C | 15.94 | 11.37 | P | 9.16 | 9.6 |
D | 18 | 13.93 | Q | −2.6 | 3.7 |
E | −3.6 | 5.41 | R | 18.18 | 15 |
F | 5.18 | 3.46 | S | −2.63 | −5.5 |
G | 35 | 46 | T | −33 | −25 |
H | −29 | −32 | U | 52 | 45 |
I | 42 | 45 | V | 6 | 5 |
J | 36 | 45 | W | 8.1 | 7 |
K | −2.47 | 4.59 | X | −1.66 | 1.5 |
L | 20.88 | 20.58 | Y | 51 | 40 |
M | 9.1 | 10 | Z | −26 | −18 |
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Xekalakis, G.; Christou, P.; Pitilakis, D.; Kyriakides, N. Quantitative Contribution of Timber Ring Beams in the Dynamic Response of Adobe Masonry Structures. CivilEng 2023, 4, 1182-1197. https://0-doi-org.brum.beds.ac.uk/10.3390/civileng4040065
Xekalakis G, Christou P, Pitilakis D, Kyriakides N. Quantitative Contribution of Timber Ring Beams in the Dynamic Response of Adobe Masonry Structures. CivilEng. 2023; 4(4):1182-1197. https://0-doi-org.brum.beds.ac.uk/10.3390/civileng4040065
Chicago/Turabian StyleXekalakis, Georgios, Petros Christou, Dimitris Pitilakis, and Nicholas Kyriakides. 2023. "Quantitative Contribution of Timber Ring Beams in the Dynamic Response of Adobe Masonry Structures" CivilEng 4, no. 4: 1182-1197. https://0-doi-org.brum.beds.ac.uk/10.3390/civileng4040065