diff --git a/CMakeLists.txt b/CMakeLists.txt
index eaba369..2ba8079 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -38,6 +38,7 @@ add_library(fesa_core STATIC
     src/fesa/io/abaqus/semantic_mapper.cpp
     src/fesa/model/domain.cpp
     src/fesa/model/domain_builder.cpp
+    src/fesa/results/result_database.cpp
     src/fesa/solvers/linear/pardiso_linear_solver.cpp
 )
 
diff --git a/include/fesa/results/result_database.hpp b/include/fesa/results/result_database.hpp
new file mode 100644
index 0000000..818db88
--- /dev/null
+++ b/include/fesa/results/result_database.hpp
@@ -0,0 +1,38 @@
+#pragma once
+
+#include <array>
+#include <string>
+#include <vector>
+
+#include <fesa/core/diagnostic.hpp>
+#include <fesa/core/status.hpp>
+#include <fesa/model/ids.hpp>
+
+namespace fesa {
+
+struct NodalFrame final {
+    std::vector<NodeId> node_ids;
+    std::vector<std::array<double, 6>> displacement;
+    std::vector<std::array<double, 6>> reaction;
+};
+
+struct ResultFrame final {
+    double step_time;
+    NodalFrame nodal;
+    std::vector<Diagnostic> diagnostics;
+};
+
+struct ResultStep final {
+    std::string name;
+    std::vector<ResultFrame> frames;
+};
+
+struct ResultDatabase final {
+    std::string schema_version;
+    std::vector<ResultStep> steps;
+};
+
+[[nodiscard]] Status validate_result_database(
+    const ResultDatabase& database);
+
+}  // namespace fesa
diff --git a/src/fesa/results/result_database.cpp b/src/fesa/results/result_database.cpp
new file mode 100644
index 0000000..4c71090
--- /dev/null
+++ b/src/fesa/results/result_database.cpp
@@ -0,0 +1,115 @@
+#include <fesa/results/result_database.hpp>
+
+#include <algorithm>
+#include <cmath>
+#include <cstdint>
+#include <set>
+#include <string>
+#include <utility>
+
+namespace fesa {
+namespace {
+
+void add_error(
+    std::vector<Diagnostic>& diagnostics,
+    std::string code,
+    std::string message) {
+    diagnostics.push_back({
+        DiagnosticStage::results,
+        Severity::error,
+        std::move(code),
+        std::move(message),
+        std::nullopt,
+    });
+}
+
+bool is_finite(const std::array<double, 6>& field) {
+    return std::ranges::all_of(
+        field,
+        [](const double component) {
+            return std::isfinite(component);
+        });
+}
+
+void validate_nodal_frame(
+    const NodalFrame& nodal,
+    std::vector<Diagnostic>& diagnostics) {
+    if (
+        nodal.displacement.size() != nodal.node_ids.size() ||
+        nodal.reaction.size() != nodal.node_ids.size()) {
+        add_error(
+            diagnostics,
+            "results.nodal_size_mismatch",
+            "Nodal IDs, displacement, and reaction fields must have "
+            "matching sizes.");
+    }
+
+    std::set<std::int64_t> node_ids;
+    for (const NodeId node_id : nodal.node_ids) {
+        if (!node_ids.insert(node_id.value()).second) {
+            add_error(
+                diagnostics,
+                "results.duplicate_node_id",
+                "Nodal frame contains duplicate node ID " +
+                    std::to_string(node_id.value()) + ".");
+        }
+    }
+
+    for (const auto& displacement : nodal.displacement) {
+        if (!is_finite(displacement)) {
+            add_error(
+                diagnostics,
+                "results.nonfinite_value",
+                "Nodal displacement contains a nonfinite component.");
+        }
+    }
+
+    for (const auto& reaction : nodal.reaction) {
+        if (!is_finite(reaction)) {
+            add_error(
+                diagnostics,
+                "results.nonfinite_value",
+                "Nodal reaction contains a nonfinite component.");
+        }
+    }
+}
+
+}  // namespace
+
+Status validate_result_database(const ResultDatabase& database) {
+    std::vector<Diagnostic> diagnostics;
+    std::set<std::string> step_names;
+
+    for (const ResultStep& step : database.steps) {
+        if (!step_names.insert(step.name).second) {
+            add_error(
+                diagnostics,
+                "results.duplicate_step_name",
+                "Result database contains duplicate step name '" +
+                    step.name + "'.");
+        }
+
+        std::set<double> frame_times;
+        for (const ResultFrame& frame : step.frames) {
+            if (!std::isfinite(frame.step_time)) {
+                add_error(
+                    diagnostics,
+                    "results.nonfinite_value",
+                    "Result frame has a nonfinite step time.");
+            } else if (!frame_times.insert(frame.step_time).second) {
+                add_error(
+                    diagnostics,
+                    "results.duplicate_frame_time",
+                    "Result step '" + step.name +
+                        "' contains duplicate frame time " +
+                        std::to_string(frame.step_time) + ".");
+            }
+
+            validate_nodal_frame(frame.nodal, diagnostics);
+        }
+    }
+
+    return {diagnostics.empty(), std::move(diagnostics)};
+}
+
+}  // namespace fesa
diff --git a/tests/CMakeLists.txt b/tests/CMakeLists.txt
index fe4c5c9..dd083b2 100644
--- a/tests/CMakeLists.txt
+++ b/tests/CMakeLists.txt
@@ -375,3 +375,34 @@ set_property(
     PROPERTY ENVIRONMENT_MODIFICATION
         ${FESA_DEPENDENCY_RUNTIME_MODIFICATIONS}
 )
+
+add_executable(fesa_result_database_tests
+    unit/results/result_database_test.cpp
+)
+
+target_compile_features(fesa_result_database_tests PRIVATE cxx_std_20)
+target_compile_options(
+    fesa_result_database_tests
+    PRIVATE
+        /W4
+        /permissive-
+        /EHsc
+)
+
+target_link_libraries(fesa_result_database_tests
+    PRIVATE
+        fesa_core
+        GTest::gtest_main
+)
+
+add_test(
+    NAME NodalFrame
+    COMMAND "$<TARGET_FILE:fesa_result_database_tests>"
+        --gtest_filter=NodalFrame.*
+)
+
+add_test(
+    NAME ResultDatabase
+    COMMAND "$<TARGET_FILE:fesa_result_database_tests>"
+        --gtest_filter=ResultDatabase.*
+)
diff --git a/tests/unit/results/result_database_test.cpp b/tests/unit/results/result_database_test.cpp
new file mode 100644
index 0000000..1d65dd6
--- /dev/null
+++ b/tests/unit/results/result_database_test.cpp
@@ -0,0 +1,138 @@
+#include <gtest/gtest.h>
+
+#include <algorithm>
+#include <array>
+#include <limits>
+#include <string_view>
+#include <utility>
+
+#include <fesa/results/result_database.hpp>
+
+namespace {
+
+std::array<double, 6> zeros() {
+    return {0.0, 0.0, 0.0, 0.0, 0.0, 0.0};
+}
+
+fesa::ResultDatabase valid_database() {
+    fesa::NodalFrame nodal{
+        {fesa::NodeId{0}, fesa::NodeId{1}},
+        {
+            zeros(),
+            {1.0, 2.0, 3.0, 0.1, 0.2, 0.3},
+        },
+        {
+            {-10.0, -20.0, -30.0, -1.0, -2.0, -3.0},
+            zeros(),
+        },
+    };
+    fesa::ResultFrame frame{1.0, std::move(nodal), {}};
+    fesa::ResultStep step{"Load", {std::move(frame)}};
+    return {"1.0.0", {std::move(step)}};
+}
+
+bool has_diagnostic(
+    const fesa::Status& status,
+    const std::string_view code) {
+    return std::ranges::any_of(
+        status.diagnostics,
+        [code](const fesa::Diagnostic& diagnostic) {
+            return diagnostic.code == code &&
+                   diagnostic.stage == fesa::DiagnosticStage::results &&
+                   diagnostic.severity == fesa::Severity::error;
+        });
+}
+
+TEST(NodalFrame, AcceptsFiniteSixComponentFieldsWithMatchingNodeIds) {
+    const auto database = valid_database();
+
+    const auto status = fesa::validate_result_database(database);
+
+    EXPECT_TRUE(status.succeeded);
+    EXPECT_TRUE(status.diagnostics.empty());
+}
+
+TEST(NodalFrame, RejectsDisplacementSizeMismatch) {
+    auto database = valid_database();
+    database.steps[0].frames[0].nodal.displacement.pop_back();
+
+    const auto status = fesa::validate_result_database(database);
+
+    EXPECT_FALSE(status.succeeded);
+    EXPECT_TRUE(has_diagnostic(status, "results.nodal_size_mismatch"));
+}
+
+TEST(NodalFrame, RejectsReactionSizeMismatch) {
+    auto database = valid_database();
+    database.steps[0].frames[0].nodal.reaction.pop_back();
+
+    const auto status = fesa::validate_result_database(database);
+
+    EXPECT_FALSE(status.succeeded);
+    EXPECT_TRUE(has_diagnostic(status, "results.nodal_size_mismatch"));
+}
+
+TEST(NodalFrame, RejectsDuplicateNodeId) {
+    auto database = valid_database();
+    database.steps[0].frames[0].nodal.node_ids[1] = fesa::NodeId{0};
+
+    const auto status = fesa::validate_result_database(database);
+
+    EXPECT_FALSE(status.succeeded);
+    EXPECT_TRUE(has_diagnostic(status, "results.duplicate_node_id"));
+}
+
+TEST(NodalFrame, RejectsNonfiniteDisplacement) {
+    auto database = valid_database();
+    database.steps[0].frames[0].nodal.displacement[1][2] =
+        std::numeric_limits<double>::quiet_NaN();
+
+    const auto status = fesa::validate_result_database(database);
+
+    EXPECT_FALSE(status.succeeded);
+    EXPECT_TRUE(has_diagnostic(status, "results.nonfinite_value"));
+}
+
+TEST(NodalFrame, RejectsNonfiniteReaction) {
+    auto database = valid_database();
+    database.steps[0].frames[0].nodal.reaction[0][4] =
+        std::numeric_limits<double>::infinity();
+
+    const auto status = fesa::validate_result_database(database);
+
+    EXPECT_FALSE(status.succeeded);
+    EXPECT_TRUE(has_diagnostic(status, "results.nonfinite_value"));
+}
+
+TEST(ResultDatabase, RejectsDuplicateStepName) {
+    auto database = valid_database();
+    database.steps.push_back(database.steps[0]);
+
+    const auto status = fesa::validate_result_database(database);
+
+    EXPECT_FALSE(status.succeeded);
+    EXPECT_TRUE(has_diagnostic(status, "results.duplicate_step_name"));
+}
+
+TEST(ResultDatabase, RejectsDuplicateFrameTimeWithinStep) {
+    auto database = valid_database();
+    database.steps[0].frames.push_back(database.steps[0].frames[0]);
+
+    const auto status = fesa::validate_result_database(database);
+
+    EXPECT_FALSE(status.succeeded);
+    EXPECT_TRUE(has_diagnostic(status, "results.duplicate_frame_time"));
+}
+
+TEST(ResultDatabase, RejectsNonfiniteFrameTime) {
+    auto database = valid_database();
+    database.steps[0].frames[0].step_time =
+        std::numeric_limits<double>::quiet_NaN();
+
+    const auto status = fesa::validate_result_database(database);
+
+    EXPECT_FALSE(status.succeeded);
+    EXPECT_TRUE(has_diagnostic(status, "results.nonfinite_value"));
+}
+
+}  // namespace