利用建筑安全与防灾多功能实验平台，采用应变标准测力技术、高温物体激光位移测试技术、水喷淋灭火技术、红外热像技术、纹影摄像技术等测量手段，通过有规律地改变钢框架结构初始温度分布、防火涂层厚度、喷水初温、喷水量和雾化细度、降温速率、冷却位置、单独或同时施加水平载荷和垂直载荷大小和分布、梁与柱端部约束刚度等，研究栓焊混合连接三榀三跨钢框架整体结构、梁、柱及楼板的轴力-应力-应变-弯矩等动力学参数变化规律；建立耦合多参数和详细热-力-快冷耦合机理的喷淋水作用下火灾高温钢框架结构受力、变形和变形加速突变理论模型，研究高温钢框架结构在喷水和火灾高温共同作用下关键构件和节点损伤对整体结构轴力-应力-应变-弯矩等动力学参数的影响及受力、变形和变形加速突变规律和临界条件。在此基础上，发展耦合热-力-快速冷却作用钢框架结构变形加速突变抑制和评价方法，揭示抑制动力学机理，为钢框架结构安全使用提供理论和技术支撑。

This project aims to study on the dynamical response mechanism of massive steel frame structure at high temperature in a fire during fire fighting water was cooling the structure, and use multi-performance experimental setup of building safety and calamity prevention, standard strain force measuring method, high-temperature laser measuring shifting technique, automatic water spraying fire fighting technique, infrared imaging technique, high-speed schlieren method. The experiment will be conducted by regularly changing the initial temperature of the massive steel structure, the thickness of fire-resistance, the initial temperature of cooling spraying water, the flow of spraying water, the fineness of water drop, the spraying angle of water nozzle, independent or simultaneously applying horizontal and vertical loads on the steel frame structure, and study on the dynamic parameters of stress-strain-bending moment of the whole structure, beams and columns for a bolt-weld hybrid junction 3 layer-3 stride massive steel frame structure, and setup the effects and damage speed-up mutation and the critical condition by the coupling parameters and detail heat-force-sharply cooling mechanisms for the theoretical model of massive steel frame structure at high temperature in a fire and sharply cooling by spraying water. On the basis of the above, developing the inhibitory and evaluation methods on damage speed-up mutation during heat-force-sharply cooling simultaneous action on the massive steel frame structure, the dynamical coupling mechanisms heat-force-sharply cooling will be revealed. The present study can provide theoretical and technical support for massive steel frame structure safety and engineering applications.