侧应变 meaning in English

lateral strain

The test results indicate stiffness , curvature , strain of side surface , cracking and ultimate load of rc beam strengthened with frp sheet are improved by different degrees . mechanics behavior of strengthened beams changes distribution of cracks and failure mode
试验结果表明：加固后混凝土梁刚度、曲率、梁侧应变以及混凝土梁开裂荷载、极限荷载都得到不同程度的改善，加固梁力学特性改变了裂缝分布形式和破坏模式。