恒压荷载下混凝土柱高温性能测试方法

混凝土构件在火灾中的高温耐火性能对建筑结构的安全性具有重要意义.根据混凝土柱构件在火灾中承受恒压荷载和高温双重作用的特征,设计出一种混凝土柱高温性能测试方法:将混凝土柱置于恒压荷载下,对其进行加热并恒温,测试加热至不同温度的混凝土构件的性能变化.根据混凝土柱在加热过程中的初始爆裂温度、高温后的爆裂程度、裂缝形态和力学性能等指标,评价其高温耐火性能.通过对3组高强混凝土棱柱体进行测试,结果表明:该方法能反映出受压混凝土柱构件的耐火性能,并且具有对测试仪器要求不高、测试方法简便和结果可靠的特点.

Test Method for Concrete Column Performance under Compressive Loading at High Temperature

The fire resistance performance of concrete component is very important for building structure safety. A test method was proposed for concrete column at high temperature under compressive loading. Firstly, a concrete column was placed under constant compressive loading, and then, the performance of the concrete column was tested at different constant temperatures after heating. The performance of the concrete column at high temperature was evaluated by first spalling temperature, spalling degree, fracture shape and axial compressive strength in the course of heating. Test results of three groups of concrete prisms show that this method can reflect the performance of concrete column at high temperature under compressive loading, and also has the advantages of low requirements for test instruments, convenient testing methods and reliable results.