Crack of column equal to improve rotating ability of end of beam . therefore , it improves ability of moment modulation of end of beam . 9 ) the secondary moment has important influence on crack load （ 9 ）次弯矩的存在对开裂荷载有较大的影响，在单层单跨框架中增加了梁端的开裂荷载，降低梁跨中的开裂荷载。
The result shows that the cracking load and the ultimate load are all increased to different extent , the rate of crack propagation has an obvious betterment and the seismic mechanism is also improved 试验结果表明，芳纶纤维加固后的砖砌体的开裂荷载和极限荷载均有不同程度的提高，延性及裂缝的开展有明显的改善，抗震性能提高。
By low - cycle and reverse horizontal loading test , the properties of the walls such as the degree of the cracking load , yield load and failure load , the property of hystersis curves and keleton - frame curves and the property of ductility 探讨了带缝空心剪力墙板在低周反复荷载下的破坏模式、滞回性能、破坏特征点、延性、耗能机制及耗能计算等抗震性能。
We made research on the degree of cracking load , yield load and failure load as well as die sequence of the structure crack and yield ; the internal force , the deformation , the failure mechanism of the building 研究结构在整个试验过程中的开裂荷载、屈服荷载、极限荷载，结构的开裂顺序、屈服顺序；以及结构的受力特点，变形特征和结构的破坏形态等。
With the modeling method in this paper , it is showed that numerical load - displacement curves agree well with the experimental skeleton curves , and that the errors of crack load are bigger , but the cra 分析表明：采用本文的建模方法，计算所得的荷载?位移曲线与试验所得的骨架曲线符合较好；开裂荷载有的误差较大，但开裂部位及过程与低周反复荷试验中某一方向加载所得的结果较为符合。
In the elastic term , the two load - displacement curves slope are similar , the new structure s slope is more greatly . stiffness is better than the traditional structure . but the new joint s crack load is littleer 在弹性阶段两者的荷载-位移曲线斜率相差不多，而且新的连接形式斜率还大一些，它的刚度较传统连接形式要好，但新的连接形式楼板开裂荷载稍偏低，应采取加强措施来提高开裂荷载。
And a nonlinear analysis of concrete beams on the basis of ansys program is used in order to overcome the shortcomings of experiments 。 the results indicate that locally strengthened technique has good reinforcing effect . it can improve the crack load , yield load and limiting load 试验结果表明,体外预应力cfrp筋局部加固法具有较好的加固效果,能够很好的提高梁的开裂荷载、屈服荷载和极限荷载。
According to the cyclic reverse loading test of two brick masonry walls without reinforement and four pieces of brick masonry walls reinforced with afrp , the cracking load , the ultimate load , the ductility factor and the rate of crack propagation were compared each other 本文共进行了六片砖砌体的抗震性能试验研究，对比了无筋砖砌体和芳纶纤维加固后砖砌体的开裂荷载、极限荷载、延性以及裂缝开展情况的异同。
This paper has put forward such one , i . e . to use the dimensional angle iron framework to strengthen the center of the knot in order to add its degree of toughness and stiffness , improve its crack load and aggrandize its ultimate deformation 本文提出了一种提高节点抗震性能的新方法? ?用空间角钢骨架对节点核心区进行加强，以增大节点的强度、刚度，提高节点的抗剪、抗裂性能，并增大节点的极限变形能力及延性性能。
Through experiment this paper compares the crack load of concrete slab with liter polypropylene fiber and glass fiber , and compare with the numerical value of theory . in the calculation assume str ess figure of the extension area is triangle or rectangle 通过试验研究对比了在混凝土板中掺入聚丙烯纤维或玻璃纤维后开裂荷载的变化情况，并与理论计算值进行比较，在理论计算中假定受拉区应力图形为三角形或矩形两种情况。
