In claim contracts, project owners and contractors set negotiated prices and exemption amounts for price adjustments to deal with the uncertainty of material prices, which is often overlooked in the optimization of procurement strategies. Therefore, considering contract claims, this paper constructs an optimization model for contractors’ traceable procurement strategies to address the multi-stage, multi-source procurement issue. A robust optimization model is used to consider the uncertainty of procurement prices, and the robust parameter is set to flexibly control the robustness of the solutions. The results indicate that contractors with different risk attitudes have the same preference for the exemption amount, but they exhibit varying sensitivities to the exemption amount and also have different preferences regarding the negotiated price. Furthermore, the study reveals that negotiated price exerts an anchoring effect on the procurement strategies of contractors.

中文翻译：

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考虑合同索赔的建筑材料可追溯采购的稳健优化模型


在索赔合同中，项目业主和承包商为价格调整设定协商价格和豁免金额，以应对材料价格的不确定性，这在采购策略的优化中经常被忽视。因此，考虑合同索赔，本文构建了承包商可追溯采购策略的优化模型，以解决多阶段、多来源的采购问题。采用稳健优化模型考虑采购价格的不确定性，并设置稳健参数以灵活控制解的稳健性。结果表明，具有不同风险态度的承包商对豁免金额的偏好相同，但他们对豁免金额表现出不同的敏感性，对协议价格的偏好也不同。此外，该研究表明，协商价格对承包商的采购策略产生锚定效应。