Database for thermal cracking of wall-on-slab structures

A dataset was compiled of approximately 200 cases from laboratory and in-situ studies on externally restrained RC members. The majority of the data were compiled from own research materials and experimental records of the authors, supplemented by selected values from published studies where available. Each entry in the database corresponds to a structural wall element with associated geometric, material, reinforcement, restraint, and cracking-related parameters. The database was compiled manually from project documentation, measurement records, and laboratory results. It includes 196 records representing 78 bridge structures, 72 tanks and containment structures and 46 laboratory specimens. For in-situ cases, input parameters were taken from construction drawings, design notes, and inspection reports, while crack widths were derived from monitoring records. For laboratory cases, values were extracted directly from test reports. A detailed set of features was included for each record, covering: Structural and geometric parameters: wall thickness, length, height, foundation dimensions, L/H ratio, Aw/Af ratio. Material parameters: concrete class (expressed with characteristic and, wherever available, measured mean compressive strength), cement type, cement content. Reinforcement details: reinforcement size and spacing, reinforcement ratio, concrete cover. Restraint conditions: type and number of restrained edges. Response measures: measured or calculated thermal, shrinkage and total strain, observed maximum crack width, crack/no-crack classification. To improve model interpretability and reduce redundancy, raw variables were combined into meaningful ratios. Instead of directly using wall length and height, the L/H ratio was employed; similarly, wall area to foundation area and reinforcement ratio were derived from basic input dimensions. All variables were harmonized to consistent units and definitions to enable like-for-like comparison across sources. Several records contained incomplete information. While full geometric characteristics, reinforcement details, and the design concrete class were available in all cases, some material-related parameters were missing, such as concrete mix composition and experimentally confirmed mechanical properties. These gaps were supplemented using typical values corresponding to the given concrete grade and the function of the structural element. Strain measurements were not always available; in such cases, shrinkage strain was calculated according to the provisions of Eurocode 2:2004, and thermal strain was estimated following the guidelines of CIRIA C766. The imputation procedure was deliberately conservative, aiming to maintain dataset consistency without introducing artificial variance.本数据集收录了约200组针对外部约束钢筋混凝土（Reinforced Concrete, RC）构件的实验室与现场研究案例。绝大多数数据来源于作者团队自有研究资料与实验记录，并辅以已发表文献中的精选可用数据。数据库中每条记录对应一个结构墙构件，附带相关几何、材料、配筋、约束及开裂相关参数。 本数据库通过人工整理项目文档、测量记录与实验室测试结果构建完成，共包含196条记录，涵盖78座桥梁结构、72个储罐与围护结构，以及46个实验室试件。对于现场案例，输入参数取自施工图纸、设计说明与检测报告，裂缝宽度则通过监测记录推导得到；对于实验室案例，参数直接从试验报告中提取。每条记录均包含一套完整的特征集，涵盖以下类别： 1. 结构与几何参数：墙体厚度、长度、高度、基础尺寸、长细比（L/H）、墙体面积与基础面积比（Aw/Af）。 2. 材料参数：混凝土强度等级（以特征强度及可获取的实测平均抗压强度表示）、水泥类型、水泥用量。 3. 配筋细节：钢筋规格与间距、配筋率、混凝土保护层厚度。 4. 约束条件：约束边缘的类型与数量。 5. 响应指标：实测或计算得到的温度应变、收缩应变与总应变、观测到的最大裂缝宽度、开裂/未开裂分类。 为提升模型可解释性并降低冗余度，原始变量被整合为有物理意义的比值形式：未直接使用墙体长度与高度，而是采用长细比（L/H）；同理，墙体面积与基础面积比及配筋率均由基础输入尺寸推导得到。所有变量均统一为标准单位与定义，以实现不同来源数据间的横向可比。 部分记录存在信息不全的情况。尽管所有案例均完整提供了几何特征、配筋细节与设计混凝土强度等级，但部分材料相关参数存在缺失，例如混凝土配合比与经实验验证的力学性能。此类参数空缺采用与给定混凝土等级及结构构件功能匹配的典型值进行补全。应变测量数据并非总能获取，此时收缩应变将依据《欧洲规范2:2004》（Eurocode 2:2004）的规定进行计算，温度应变则参照CIRIA C766指南进行估算。本次补全过程刻意采用保守方式，旨在维持数据集一致性且不引入人为方差。