1、鋼結構與鋼筋混凝土結構抗震優勢比較一、材料分析比較“地震力”是慣性力，混凝土結構質量大，慣性力大；鋼結構質量小，慣性小。所以在相同的地震作用下，混凝土結構受到很大的力，鋼結構受到的力小。這是外因。內因，鋼結構材料強度高，耗能強，是延性材料，有屈服臺階，通過包絡曲線來耗能。而混凝土是脆性材料！鋼結構所用的是鋼材最低是用Q235，大部分的鋼結構材料用的都是Q345。鋼結構的阻尼比一般在0.010.02之間，鋼筋混凝土結構的阻尼比一般在0.030.08之間。阻尼比小，在地震力作用下，變形大，因為鋼結構韌性好，通過變形消耗地震能量，且容易恢復。鋼結構較為柔軟主要通過彈塑性變形吸收能量，較混凝土而言脆斷

2、的可能性低得多，一般認為10層以下的鋼結構建筑物基本不會發生倒塌事故。二、結構設計計算方式分析鋼結構采用彈性理論設計的，其構件能夠在地震小幅度變形后再恢復；而鋼筋混凝土結構是剛性理論設計的，不能變形，就不能吸收地震的能量。跨度越大越實惠，可回收，環保符合綠色建筑理念由于鋼材塑性、韌性好，可有較大變形，能很好地承受動力荷載，其次鋼材勻質性和各向同性好，屬理想彈性體，最符合一般工程力學的基本假定，因此，鋼結構的抗震性能比鋼筋混凝土結構的抗震性能好。三、模型分析荷載表格2層梁恒載2層樓板活荷載2層樓板恒荷載屋頂板活荷載屋頂板橫荷載屋頂梁恒載10KN/M23KN/M23KN/M23KN/M25KN/M

3、25KN/M21、鋼結構在荷載作用下的位移變形2、混凝土在相同荷載作用下的位移變形以上結構為鋼結構和鋼筋混凝土結構模型，兩種結構在相同的荷載作用下，鋼結構沿1、2、3軸的位移分別是0.00919mm、-0.00570 mm、-15746 mm。鋼筋混凝土沿1、2、3軸的位移分別是0.00909mm、-0.00909 mm、-0.15255mm。從模型位移分析里看，加上鋼結構震后快速恢復的特點，而混凝土結構屬于剛性結構，變形后不可恢復原形，從而鋼結構在抗震的方面要優于鋼筋混凝土結構。四、綜合分析從兩種結構的材料分析和設計計算方式比較，模型分析比較，能很明確的知道鋼結構建筑從抗震和結構穩定性來看，

4、都優于鋼筋混凝土結構建筑，這也是歐美發達國家50%以上的建筑為鋼結構建筑的原因。The Earthquake advantage of steel frame structure and concrete structure1、The material analysisSeismic force is the inertia force, the quality of concrete structures is biggest than steel frame structure ;so the inertia forces of concrete structures is biggest

5、 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, energy consumption is fast , yield steps is benefit to

6、 energy consumption . But Concrete structureis 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 damping ratio is generally between 0.01-0.02 , the damping of reinforced concrete structures than the average be

7、tween 0.03-0.08 . The damping ratio smaller, the seismic force have large deformation , the steel toughness is good, the seismic energy consumption by deformation , so easy to restore . The steel structure is relatively soft ; absorb energy through elastic-plastic deformation than the concrete , the

8、 possibility of brittle fracture is much lower , generally below the 10-floor steel buildings do not collapse accident occurred .2、The analysis comparison of two structural design calculations Steel structure designed using the theory of elasticity；its components can recovery after earthquake deform

9、ation ，reinforced concrete structure is rigid design theory can not be deformed，it can not absorb the energy of the earthquake，so Span bigger and more affordable, recyclable , environmental protection and meet the green building concept。Steel ductility, toughness , large deformation , can well withs

10、tand the dynamic loads，and Steel homogeneous and isotropic , is an ideal elastomer。Conform with basic assumption of the general engineering mechanics，so the seismic performance of steel structures is better than concrete structures .3、Structural model analysisLoad formfirst floor beam dead loadfirst

11、 floor slab Live loadfirst floor slab dead loadroof floor slab live loadroof slab dead loadroof beam dead load10KN/M23KN/M23KN/M23KN/M25KN/M25KN/M2（1）、Displacement deformation of the steel structure in the loads（2）、Displacement deformation of the concrete structure in the same loadsThe above structu

12、re of steel and reinforced concrete structural model。Two structures in the same loads，The steel structure along the 1,2,3 axis displacement is：0.00919mm、-0.00570 mm、-15746 mm。Reinforced concrete along the 1,2,3 axis displacement is 0.00909mm、-0.00909 mm、-0.15255mm。the displacement analysis from the

13、model analysis ，and the characteristics of fast recovery in the steel structure after the earthquake，the concrete structure is a rigid structure ，deformation can not restore after the prototype ，steel structures is superior to reinforced concrete structure in seismic areas。4、A comprehensive analysisMaterials analysis and design method of calculation， model analysis and comparison ， the two structures is very clear that we know the steel construction o