Abstract : based on the systematic analysis of the shear behavior for r . c . beams , the tests of 11 simple supported beams under the top concentrated loads and the uniform loads are supplemented . the prime variable is shear span ratio , span depth ratio , horizontal web reinforcement ratio and vertical web reinforcement ratio . according to the test results , the working behavior , the prime shear failure modes , the effect of concrete and web reinforcement ( horizontal web reinforcement and vertical web reinforcement ) and other aspects of r . c . beams are analysed . the uniform calculation method for shear capacity of deep beams , short beams and shallow beams for practical is presented 文摘:在對國內(nèi)外鋼筋混凝土梁的受剪性能進(jìn)行較系統(tǒng)分析的基礎(chǔ)上,補(bǔ)充了11根鋼筋混凝土簡支短梁在頂部集中荷載和均布荷載作用下的試驗,試驗梁的主要變化參數(shù)為剪跨比、跨高比、水平腹筋率和垂直腹筋率.根據(jù)試驗結(jié)果,對試驗梁的工作性能、主要的剪切破壞形態(tài)、混凝土項的抗剪作用、抗剪腹筋(包括水平腹筋、垂直腹筋)的作用等進(jìn)行了較為深入的分析,提出了可適用鋼筋混凝土深梁、短梁和淺梁相互協(xié)調(diào)的受剪承載力的統(tǒng)一計算方法
The contents include as follows : the influencing factors of the displacement ductility factor of the unbonded partially prestressed concrete frame structures , such as stirrup reinforcement characteristic value , nominal shear span ratio , axial compression ratio , the appearing order of plastic hinges and partial prestressing ralio ( ppr ) are discussed . the formula of displacement ductility factor of the unbonded partially prestressed concrete frame structures is suggested by regression analysis . with regard to the aseismic design and the request of ductility and energy dissipation , the restriction of the flat - beam / column sectional size and aseismic reinforced design are discussed 本文主要包括以下內(nèi)容:討論了配箍特征值、名義剪跨比、軸壓比、塑性鉸出現(xiàn)順序、預(yù)應(yīng)力度等因素對無粘結(jié)部分預(yù)應(yīng)力混凝土框架位移延性系數(shù)的影響,回歸了考慮影響因素的位移延性系數(shù)計算公式;對無粘結(jié)部分預(yù)應(yīng)力混凝土扁梁框架結(jié)構(gòu),闡述了抗震設(shè)計對扁梁、柱截面尺寸的要求與限制;對滿足延性和耗能要求的無粘結(jié)部分預(yù)應(yīng)力混凝土扁梁控制截面抗震配筋進(jìn)行了探討;通過對無粘結(jié)部分預(yù)應(yīng)力混凝土扁梁梁端的受力分析,改進(jìn)了以往扁梁梁端扭矩設(shè)計值計算公式。
Based on the numerical simulation and accuracy analysis to previous slab ' s test with the ansys program , the study of composite wall , with various detail design under potential load action respectively or jointly is carried on and the wall ' s atress behavior and failure mode is obtained , also the influence to wall ' s stiffness and bearing capacity by kinds of factors , including wall ' s shear span ratio , member ' s section , bar arrangement , etc . based on the hammer blow test and stiffness test , a 1 / 3 scale ten - bay model ' s modality parameter and elastic deformation characteristic is analyzed 在對密肋復(fù)合墻板運(yùn)用ansys ~ ( ( ? ) )程序進(jìn)行數(shù)值模擬、分析驗證的基礎(chǔ)上,對典型組合墻體在不同連接構(gòu)造和不同荷載效應(yīng)組合作用下的受力形態(tài)和破壞模式進(jìn)行研究;計算分析了復(fù)合墻體剪跨比、邊框柱截面尺寸、邊框柱配筋大小以及墻板內(nèi)肋梁肋柱配筋等諸多因素對密肋復(fù)合墻體承載力及剛度的影響,得出其變化規(guī)律。
When the axial compression ratio increases more than 0 . 42 , the variation of the displacement ductility ratios is small ; when the stirrup ratio per unit volume increases more than 1 . 9 % , the displacement ductility increases slowly ; with increasing the shear span ratio a , the displacement ductility increases for , < 1 . 5 , decreases for > 1 . 5 當(dāng)軸壓力系數(shù)增加到0 . 42以后,位移延性的變化較小;體積配箍率增加到1 . 9 %后,位移延性的增長減緩;當(dāng)剪跨比小于1 . 5時,型鋼混凝土柱的延性系數(shù)隨剪跨比的增加而提高;但當(dāng)剪跨比大于1 . 5時,隨著剪跨比的增加,型鋼混凝土柱位移延性系數(shù)有所降低。
On the basic of former research men ' s experience , 18 experimental members ( including 9 simple beams and 9 restrained beams ) are designed and tested . in the experiment , phenomena are observed and record by taking photos in the whole process from the first crack appears to test members crash completely , experimental data is attained including load values of crack - appear load , critical load and terminal load , stress values of reinforcing steel bar stress , compressed concrete stress and beam flank stress and values of deflection etc . by analyzing the crack ' s appearing and developing form and stress values of concrete and steel bars , the crash modes of test beams are defined ; shearing force - deflection curves are contrasted and analyzed ; the effects on shear strength of the three factors as shear span ratio , concrete strength and restraining moment are also analyzed 借鑒已有試驗的經(jīng)驗,本文設(shè)計和完成了對18根超高強(qiáng)混凝土無腹筋梁(包括9根簡支梁和9根約束梁)在集中荷載下抗剪強(qiáng)度的試驗,觀察了試件從裂縫出現(xiàn)到完全破壞失去承載能力全過程的試驗現(xiàn)象并通過拍照進(jìn)行記錄,獲得了試件的斜裂縫出現(xiàn)荷載、臨界斜裂縫荷載和極限荷載等荷載值和縱筋應(yīng)變、混凝土受壓應(yīng)變和梁側(cè)混凝土應(yīng)變等應(yīng)變值以及撓度值等。