However , there is still a lot to be advanced . the paper , based on test and other available material , mainly studied on mechanical property and oblique section bearing capacity of the composite slab . 1 本文是在对试验和已有资料进行分析的基础上，就密肋复合墙板的受力性能及斜截面承载能力实用设计方法进行了研究，完成了如下工作： 1
On the basis of shear resisting behavior experiments of the column , the formula model for calculating the shear strength of the column is presented , and the undetermined coefficient in the formula is regressed using the experimental data 在核心柱的剪切性能的试验基础上，建立了核心柱斜截面承载力的计算公式模型，并利用试验数据回归，确定了公式模型中的待定参数。
Two types of the equivalent mode of concrete compression zone were discussed and the corresponding formulae to calculate normal section strength of unbonded prestressed composite beams with reaction powder concrete were given . the calculating results tend to be conservative 结果表明，现有公式在计算rpc预应力叠合梁的斜截面开裂荷载及斜截面抗剪强度时，是偏于保守的。
It canbe determined the enhancing effect of new steel fiber to shear resistance of beams by the test of tensile strength of steel fiber reinforced concrete , it is important to reduce test cose and increase research efficiency 可以通过钢纤维混凝土抗拉强度试验来确定新品种钢纤维对梁斜截面上混凝土受剪承载力的增强作用，这对于降低试验成本和提高研究效率具有重要工程价值。
Steel fiber reduces the size effect of shear resistance of reinforced concrete beams without web reinfocements . the size effect formula is proposed in this paper , it is better agreement with test data . 5 钢纤维对钢筋混凝土无腹筋梁斜截面承载力“尺寸效应”具有降低作用，本文提出了与现行规范相衔接的钢筋钢纤维混凝土腹筋梁斜截面承载力“尺寸效应”计算公式，与现有的试验资料符合良好。
Using the contrast tests of 13 recycled aggregate concrete beams and natural aggregate concrete beams , the effects of replacement ratio of recycled coarse aggregate and shear - span ratio on the characters of shear capacity and deformability of recycled concrete beams are investigated 摘要通过13根再生混凝土梁与普通混凝土梁的对比试验，对再生粗骨料取代率、剪跨比等因素对再生混凝土梁斜截面受力和变形性能的影响进行探讨。
The main conclusions are as following : 1 . specimens have four kinds of fatigue failure characteristics such as normal section crack width and truncated section crack width beyond the limit , the fatigue damage of steel bars . specimens ’ fatigue life is from 15 thousand to 1800 thousand 主要结论如下: 1 、试件出现了正截面裂缝宽度达到限值、斜截面裂缝宽度达到限值、钢筋疲劳断裂等疲劳破坏特征,疲劳寿命介于1 . 5万次180万次。
The objective function is the cost of anti - slide pile " s per meter ; the constraint conditions are the strength of anti - slide pile " s normal section and inclined section , the ratio of reinforcing design and the size of section in the design code ; the design variables are the height of section , the area of reinforcement and the amount of hoop . and the optimization model is solved by 0 . 618 method 本文提出的优化设计方法，以桩单位长度的总造价为目标函数，以规范对单筋梁的正、斜截面强度，配筋率及截面尺寸等要求为约束条件，以桩截面高度，抗弯纵筋面积，抗剪箍筋数量等为设计变量，来建立优化模型，并用0 . 618法进行求解。
The corbel ' s dimension should be ascertained as the manipulative condition of diagonal section . the amount of longitudinal reinforcement be ascertained on the basis of the flexure model , is obtained according to static for balance condition , the calculative expression of the load is obtained . and in terms of the design method in ultimate state the maximum load 我国规范对于牛腿的设计规定，牛腿尺寸的确定以斜截面抗裂作为控制条件，纵筋用量的确定以弯压破坏模型为基础，根据静力平衡条件得到承载力的计算公式，按照极限状态设计方法计算得到，箍筋用量则按照构造要求确定。
From the analysis , some suggestion about joint rigidity design is put forward : 1 . joint initial rigidity can be enhanced within the limited range when to increase end - plate thickness ; 2 . the rigidity and ultimate moment can be enhanced obviously when to adopt the beam with inclined section or to add axilla at the connections between beam and column ; 3 . withm the permissive construction condition , exteriorly extended end - plate inclinedly placed is suggested to be applied firstly ; 4 . when the rate of joint rigidity to beam rigidity , that is called , is less than 0 . 1 , the joints can be regarded as zero - rigidity joints ; on the other hand , if is more than 26 , it is rigid connection joints 采用斜截面梁并在梁柱交接处局部加腋能明显提高节点刚度和梁的抗弯能力； 3在允许的施工条件下，应优先采用外伸式端板斜放节点，有利于提高节点刚度，进而提高节点的抗弯能力； 4节点刚度与其连接构件的刚度比值0 . 1时，可按铰接节点设计； 26时，可按刚接节点设计。
