A Large Language Model-Empowered Agent for Reliable and Robust Structural Analysis

• URL: http://arxiv.org/abs/2507.02938v1
• Date: Fri, 27 Jun 2025 04:16:53 GMT
• Title: A Large Language Model-Empowered Agent for Reliable and Robust Structural Analysis
• Authors: Jiachen Liu, Ziheng Geng, Ran Cao, Lu Cheng, Paolo Bocchini, Minghui Cheng,
• Abstract summary: Large language models (LLMs) have exhibited remarkable capabilities across diverse open-domain tasks, yet their application in specialized domains such as civil engineering remains largely unexplored.<n>This paper starts bridging this gap by evaluating and enhancing the reliability and robustness of LLMs in structural analysis of beams.<n> Experimental results demonstrate that the agent achieves accuracy exceeding 99.0% on the benchmark dataset, exhibiting reliable and robust performance across diverse conditions.
• Score: 14.754785659805869
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Large language models (LLMs) have exhibited remarkable capabilities across diverse open-domain tasks, yet their application in specialized domains such as civil engineering remains largely unexplored. This paper starts bridging this gap by evaluating and enhancing the reliability and robustness of LLMs in structural analysis of beams. Reliability is assessed through the accuracy of correct outputs under repetitive runs of the same problems, whereas robustness is evaluated via the performance across varying load and boundary conditions. A benchmark dataset, comprising eight beam analysis problems, is created to test the Llama-3.3 70B Instruct model. Results show that, despite a qualitative understanding of structural mechanics, the LLM lacks the quantitative reliability and robustness for engineering applications. To address these limitations, a shift is proposed that reframes the structural analysis as code generation tasks. Accordingly, an LLM-empowered agent is developed that (a) integrates chain-of-thought and few-shot prompting to generate accurate OpeeSeesPy code, and (b) automatically executes the code to produce structural analysis results. Experimental results demonstrate that the agent achieves accuracy exceeding 99.0% on the benchmark dataset, exhibiting reliable and robust performance across diverse conditions. Ablation studies highlight the complete example and function usage examples as the primary contributors to the agent's enhanced performance.

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