钢结构与钢筋混凝土结构抗震优势比较

1、精品文档钢结构与钢筋混凝土结构抗震优势比较一、材料分析比较“地震力”是惯性力，混凝土结构质量大，惯性力大；钢结构质量 小，惯性小。所以在相同的地震作用下，混凝土结构受到很大的力， 钢结构受到的力小。这是外因。内因，钢结构材料强度高，耗能强，是延性材料，有屈服台阶，通过包络曲线来耗能。而混凝土是脆性材料！钢结构所用的是钢材最低是用 Q235 大部分的钢结构材料用的都是 Q345钢结构的阻尼比一般在 0.01 0.02 之间，钢筋混凝土结构 的阻尼比一般在0.03 0.08 之间。阻尼比小，在地震力作用下，变形大，因为钢结构韧性好，通过变形消耗地震能量，且容易恢复。钢 结构较为柔软主要通过弹塑性变

2、形吸收能量， 较混凝土而言脆断的可 能性低得多，一般认为 10 层以下的钢结构建筑物基本不会发生倒塌 事故。二、结构设计计算方式分析钢结构采用弹性理论设计的， 其构件能够在地震小幅度变形后再恢复；而钢筋混凝土结构是刚性理论设计的，不能变形，就不能吸收地 震的能量。跨度越大越实惠，可回收，环保符合绿色建筑理念由于钢材塑性、韧性好，可有较大变形，能很好地承受动力荷载，其次钢材匀质性和各向同性好， 属理想弹性体， 最符合一般工程力学的基本假定，因此，钢结构的抗震性能比钢筋混凝土结构的抗震性能好。三、模型分析何载表格2层梁恒载2层楼板活荷 载2层楼板恒荷载屋顶板活荷载屋顶板横荷载屋顶梁恒载10KN/M

3、23KN/M23KN/M23KN/M25KN/M25KN/M21、钢结构在荷载作用下的位移变形2、混凝土在相同荷载作用下的位移变形以上结构为钢结构和钢筋混凝土结构模型，两种结构在相同的荷载作用下，钢结构沿1、2、3轴的位移分别是0.00919mm-0.00570 mm-15746 mm钢筋混凝土沿1、2、3轴的位移分别是0.00909mm-0.00909mm-0.15255mm。从模型位移分析里看，加上钢结构震后快速恢复的特点,而混凝土结构属于刚性结构，变形后不可恢复原形，从而钢结构在抗震的方 面要优于钢筋混凝土结构四、综合分析从两种结构的材料分析和设计计算方式比较，模型分析比较，能很 明确的

4、6欢迎下载精品文档知道钢结构建筑从抗震和结构稳定性来看， 都优于钢筋混凝土 结构建筑，这也是欧美发达国家 50% 以上的建筑为钢结构建筑的原因。The Earthquake adva ntage of steel frame structure and con crete structure1 、 The material analysisSeismic force is the inertia force, the quality of concrete structures is biggest than steel frame structure ;so the inertia forc

5、es of concrete structures is biggest than the steel frame structures. in the same earthquake , concrete structure subject to considerable force , the steel structure is smaller . this is external reason .steel frame structure have high strength steel materials , ductile materials, en ergy con sumpti

6、 on is fast , yield steps is ben efit to en ergy con sumpti on . But Con crete structure is a brittle material.Steel structure with the minimum of steel Q235, most of the steel materials used are of Q345. The steel structure of the damp ing ratio is gen erally betwee n 0.01-0.02 the damp ing of rein

7、 forced con crete structurestha n the average betwee n 0.03-0.08The damping ratio smaller, the seismic force have large deformation , the steel toughness is good, the seismic energy consumption by deformation, so easy to restoreThe steel structure is relatively soft ; absorb en ergy through elastic-

8、plastic deformation than the concrete , the possibility of brittle fracture is much lower , gen erally below the 10-floor steel build ings do not collapse accide nt occurred .2 、 The analysis comparison of two structural design calculati onsSteel structure designed using the theory of elasticity； it

9、s components canrecovery after earthquake deformati on， rein forced con crete structure is rigiddesign theory can not be deformed ， it can not absorb the energy of theearthquake ，so Span bigger and more affordable, recyclable , en viro nmen talprotect ion and meetthe gree n build ing con cept 。Steel

10、 ductility, tough ness , large deformati on , can well withsta nd the dyn amic loads ， and Steel homoge neous and isotropic , is an ideal elastomer。 Con form withbasic assumption of the general engineering mechanics， so the seismic performaneeof steel structures is better tha n con crete structures

11、.3、Structural model analysisLoad formfirst floor beam dead loadfirst floorslab Live loadfirst floor slab dead loadroof floor slab liveloadroof slab deadloadroof beam deadload10KN/M23KN/M23KN/M23KN/M25KN/M25KN/M2(1)、 Displacement deformation of the steel structure in the loads节直对堞3.3&2E-04A1.1574

12、6D.OODOORotn3节点单元3 21-O.(M)57Q0.009192.109E-043(2)、Displacement deformation of the concrete structure in the same loads12欢迎下载3-0.152550.00000节点期慕TrAnHolri31Q.009093.32GE-04节点单元3 0.009093.326E n4The above structure of steel and reinforcedconcrete structural model 。 Twostructures in the same loads , T

13、he steel structure along the 1,2,3 axis displacement is : 0.00919mm -0.00570 mm、-15746 mm o Reinforced concrete along the 1,2,3 axis displacement is 0.00909mm -0.00909 mm -0.15255mm o the displacement analysis from the model analysis , and the characteristics offast recovery in the steel structure a

14、fter the earthquake , the concrete structure is a rigid structure , deformation can not restore after the prototype , steel structures is superior to rein forced con crete structure in seismic areas o4、A comprehensive analysisMaterials an alysis and desig n method of calculati on,model an alysis andcomparison , the two structures is very clear that we know the steel construction of seismic and structuralstability , super