feat(linear-static-3d-euler-beam): step 16 - euler-beam-element

2026-08-09 18:04:52 +09:00
parent 6fa01de5f9
commit 987f276ef1
6 changed files with 1486 additions and 0 deletions
@@ -0,0 +1,74 @@
+#pragma once
+
+#include "fesa/core/status.hpp"
+#include "fesa/math/matrix.hpp"
+#include "fesa/math/vector.hpp"
+#include "fesa/model/model_types.hpp"
+
+#include <array>
+#include <cstddef>
+#include <string>
+#include <vector>
+
+namespace fesa {
+
+struct ConstantLocalLineLoad {
+    double px;
+    double py;
+    double pz;
+    double mx;
+};
+
+struct BeamStressPoint {
+    int gaussPoint;
+    std::size_t sectionPoint;
+    double x1;
+    double x2;
+    double s11;
+    std::string source;
+};
+
+struct BeamRecovery {
+    std::array<std::array<double, 6>, 2> equilibriumEndActions;
+    std::array<std::array<double, 4>, 2> endpointSectionResultants;
+    std::array<std::array<double, 4>, 2> gaussGeneralizedStrains;
+    std::array<std::array<double, 4>, 2> gaussGeneralizedResultants;
+    std::vector<BeamStressPoint> stressPoints;
+};
+
+// Implements the approved two-node straight prismatic B33 Euler-Bernoulli
+// kernel. Equation numbering and element identity remain outside this type.
+class EulerBeam3D {
+public:
+    static Result<EulerBeam3D> create(const Node& firstNode,
+                                      const Node& secondNode,
+                                      const GeneralBeamSection& section,
+                                      const LinearElasticMaterial& material);
+    Matrix localStiffness() const;
+    Matrix globalStiffness() const;
+    Vector localEquivalentLoad(const ConstantLocalLineLoad& load) const;
+    BeamRecovery recover(const Vector& globalElementDisplacement) const;
+
+private:
+    EulerBeam3D(double length,
+                double youngsModulus,
+                double shearModulus,
+                double area,
+                double iy,
+                double iz,
+                double torsionalConstant,
+                std::array<double, 9> rotation,
+                std::vector<std::array<double, 2>> sectionPoints);
+
+    double length_;
+    double youngsModulus_;
+    double shearModulus_;
+    double area_;
+    double iy_;
+    double iz_;
+    double torsionalConstant_;
+    std::array<double, 9> rotation_;
+    std::vector<std::array<double, 2>> sectionPoints_;
+};
+
+} // namespace fesa