New issue alert

We are pleased to announce the publication of the latest issue of JSEAM, featuring new contributions across structural engineering and applied mechanics. This issue highlights advances in seismic isolation design, earthquake code-based seismicity assessment, sustainable fiber-reinforced geopolymer structural members, ground-motion scaling effects in performance-based evaluation, electromagnetic field interactions with building materials, crashworthiness of thin-walled tubes, contact mechanics of functionally graded layers on elastic foundations, and seismic demand amplification under strong recorded accelerations.

Highlights from this issue include:

1. Preliminary design-based assessment of lead-rubber bearing (LRB) isolation systems across Türkiye
   A geospatial/statistical framework is presented to examine how soil class and seismic hazard influence preliminary LRB parameters (e.g., isolator diameter, displacement demand, effective period, damping) for a representative reinforced concrete building.

2. Seismicity evaluation of Sivas City under the 2007 vs 2018 Turkish Earthquake Codes
   Using response spectrum analysis on a sample RC building, this paper compares modal results, spectra, base shear, and roof displacements across districts and soil classes—showing notable differences between code generations, particularly for weaker soils.

3. Shear performance of geopolymer concrete beams reinforced with industrial and waste fibers (without stirrups)
   Experimental results demonstrate how various industrial and waste fibers can enhance shear capacity, crack control, toughness, and energy dissipation in slag-based geopolymer beams—supporting sustainable alternatives to conventional reinforcement strategies.

4. Impact of scaled vs non-scaled earthquake records on seismic performance of high-rise RC buildings
   Linear and nonlinear analyses (including nonlinear time-history) quantify how spectrum scaling affects deformation demands, plastic rotations, and wall strains, and discuss implications for performance limits in tall-building assessment.

5. Electromagnetic fields and building materials: base-station radiation and shielding effectiveness
   Field measurements evaluate the EMF attenuation performance of common materials (including recycled concrete), emphasizing material type, thickness, and safety distance effects in practical shielding design.

6. Crashworthiness of sinusoidally patterned thin-walled tubes with variable wall thickness
   Finite element simulations investigate how corrugation geometry and thickness tailoring improve crushing response and energy absorption, providing design guidance for lightweight protective components.

7. Contact problem of a functionally graded isotropic layer supported by a Kerr foundation
   An elasticity-based formulation models indentation/loading via singular integral equations and numerical solution (Gauss–Chebyshev), exploring effects of inhomogeneity, load level, and foundation parameters.

8. Influence of ground acceleration on seismic performance of RC buildings designed to the 1975 Turkish Earthquake Code
   Using real records from the 6 February 2023 Kahramanmaraş earthquakes, the study analyzes how increased acceleration intensifies demands and shows that configuration irregularities can govern drift/acceleration amplification beyond acceleration level alone.

This issue underlines JSEAM’s focus on earthquake engineering, resilient design, sustainable materials, and advanced mechanics-based modeling. We invite researchers and practitioners to explore the full texts and DOIs via the issue page.